1.7.0-beta2

Only scroll to selected item in <LayerList/> if not already in view.

.babelrc

@@ -1,4 +1,20 @@
 {
-  "presets": ["env", "react"],
-  "plugins": ["transform-object-rest-spread", "transform-class-properties"]
+  "presets": [
+    "@babel/preset-env",
+    "@babel/preset-react"
+  ],
+  "plugins": [
+    "static-fs",
+    "react-hot-loader/babel",
+    "@babel/plugin-proposal-class-properties"
+  ],
+  "env": {
+    "test": {
+      "plugins": [
+        ["istanbul", {
+          "exclude": ["node_modules/**", "test/**"]
+        }]
+      ]
+    }
+  }
 }

.circleci/config.yml

@@ -0,0 +1,103 @@
+version: 2
+templates:
+  # Test the build **only** no webdriver
+  build-steps: &build-steps
+    - checkout
+    - run:
+        name: "Create artifacts directory"
+        command: mkdir /tmp/artifacts
+    - restore_cache:
+        key: v1-dependencies-{{ arch }}-{{ checksum "package.json" }}
+
+    - run: npm install
+
+    - save_cache:
+        paths:
+          - node_modules
+        key: v1-dependencies-{{ arch }}-{{ checksum "package.json" }}
+
+    - run: mkdir -p /tmp/artifacts/logs
+    - run: npm run build
+    - run: npm run lint-js
+    - run: npm run lint-css
+    - store_artifacts:
+        path: /tmp/artifacts
+        destination: /artifacts
+  # Test in webdriver
+  wdio-steps: &wdio-steps
+    - checkout
+    - run:
+        name: "Create artifacts directory"
+        command: mkdir /tmp/artifacts
+    - restore_cache:
+        key: v1-dependencies-{{ arch }}-{{ checksum "package.json" }}
+
+    - run: npm install
+
+    - save_cache:
+        paths:
+          - node_modules
+        key: v1-dependencies-{{ arch }}-{{ checksum "package.json" }}
+
+    - run: mkdir -p /tmp/artifacts/logs
+    - run: npm run build
+    - run: npm run profiling-build
+    - run: npm run lint-js
+    - run: npm run lint-css
+    - run: DOCKER_HOST=localhost npm test
+    - run: ./node_modules/.bin/istanbul report --include /tmp/artifacts/coverage/coverage.json --dir /tmp/artifacts/coverage html lcov
+    - store_artifacts:
+        path: /tmp/artifacts
+        destination: /artifacts
+jobs:
+  build-linux-node-v10:
+    docker:
+      - image: node:10
+      - image: selenium/standalone-chrome:3.141.59
+    working_directory: ~/repo-linux-node-v10
+    steps: *wdio-steps
+  build-linux-node-v12:
+    docker:
+      - image: node:12
+    working_directory: ~/repo-linux-node-v12
+    steps: *build-steps
+  build-linux-node-v13:
+    docker:
+      - image: node:13
+    working_directory: ~/repo-linux-node-v13
+    steps: *build-steps
+  build-osx-node-v10:
+    macos:
+      xcode: "9.0"
+    dependencies:
+      override:
+        - brew install node@10
+    working_directory: ~/repo-osx-node-v10
+    steps: *build-steps
+  build-osx-node-v12:
+    macos:
+      xcode: "9.0"
+    dependencies:
+      override:
+        - brew install node@12
+    working_directory: ~/repo-osx-node-v12
+    steps: *build-steps
+  build-osx-node-v13:
+    macos:
+      xcode: "9.0"
+    dependencies:
+      override:
+        - brew install node@13
+    working_directory: ~/repo-osx-node-v13
+    steps: *build-steps
+
+workflows:
+  version: 2
+  build:
+    jobs:
+      - build-linux-node-v10
+      - build-linux-node-v12
+      - build-linux-node-v13
+      - build-osx-node-v10
+      - build-osx-node-v12
+      - build-osx-node-v13

.github/FUNDING.yml

@@ -0,0 +1 @@
+custom: "https://maputnik.github.io/donate"

.gitignore

@@ -30,3 +30,6 @@ node_modules
 
 # Ignore build files
 public
+/errorShots
+/old
+/build

.topissuesrc

@@ -0,0 +1,15 @@
+{
+    "labels": {
+        "bug": 5,
+        "maintenance": 3,
+        "mentioned in the 1st survey": 2
+    },
+    "reactions": {
+        "+1": 2,
+        "-1": -1,
+        "laugh": 1,
+        "hooray": 2,
+        "confused": 1,
+        "heart": 2
+    }
+}

.travis.yml

@@ -1,41 +0,0 @@
-language: node_js
-addons:
-  firefox: latest
-matrix:
-  include:
-    - os: linux
-      node_js: "6"
-    - os: linux
-      env: CXX=g++-4.8
-      node_js: "7"
-    - os: linux
-      node_js: "8"
-    - os: linux
-      env: CXX=g++-4.8
-      node_js: "9"
-    - os: osx
-      node_js: "6"
-    - os: osx
-      node_js: "7"
-    - os: osx
-      node_js: "8"
-    - os: osx
-      node_js: "9"
-before_install:
-  - export CHROME_BIN=chromium-browser
-  - export DISPLAY=:99.0
-  - if [[ "$TRAVIS_OS_NAME" == "linux" ]]; then sh -e /etc/init.d/xvfb start; fi
-install:
-  - npm install
-script:
-  - mkdir public
-  - node --stack_size=100000 $(which npm) run build
-  - npm run lint
-  - npm run lint-styles
-  - npm run test
-addons:
-  apt:
-    sources:
-      - ubuntu-toolchain-r-test
-    packages:
-      - g++-4.8

Dockerfile

@@ -1,4 +1,9 @@
-FROM nodesource/xenial:6.1.0
+FROM node:10-slim
+
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    git \
+    python \
+ && rm -rf /var/lib/apt/lists/*
 
 EXPOSE 8888
 
@@ -9,7 +14,8 @@ COPY . ${HOME}/
 
 WORKDIR ${HOME}
 
-RUN npm install -d --dev
+RUN npm install -d
 RUN npm run build
 
-CMD npm run start -- --host 0.0.0.0
+WORKDIR ${HOME}/build/build
+CMD python -m SimpleHTTPServer 8888

README.md

@@ -1,26 +1,32 @@
 # Maputnik
 
-[![Build Status](https://travis-ci.org/maputnik/editor.svg?branch=master)][travis]
+[![Build Status](https://circleci.com/gh/maputnik/editor/tree/master.svg?style=shield)][circleci]
 [![Windows Build Status](https://ci.appveyor.com/api/projects/status/anelbgv6jdb3qnh9/branch/master?svg=true)][appveyor]
 [![Dependency Status](https://david-dm.org/maputnik/editor.svg)][dm-prod]
 [![Dev Dependency Status](https://david-dm.org/maputnik/editor/dev-status.svg)][dm-dev]
 [![License](https://img.shields.io/badge/license-MIT-blue.svg)][license]
 
-[travis]:      https://travis-ci.org/maputnik/editor
+[circleci]:    https://circleci.com/gh/maputnik/editor/tree/master
 [appveyor]:    https://ci.appveyor.com/project/lukasmartinelli/editor
 [dm-prod]:     https://david-dm.org/maputnik/editor
-[dm-dev]:      https://david-dm.org/maputnik/editor#info=devDependencies
+[dm-dev]:      https://david-dm.org/maputnik/editor?type=dev
 [license]:     https://tldrlegal.com/license/mit-license
 
-<img width="200" align="right" alt="Maputnik" src="src/img/maputnik.png" />
+<img width="200" align="right" alt="Maputnik" src="https://cdn.jsdelivr.net/gh/maputnik/editor@1.5.0/src/img/maputnik.png" />
 
 A free and open visual editor for the [Mapbox GL styles](https://www.mapbox.com/mapbox-gl-style-spec/)
 targeted at developers and map designers.
 
 - :link: Design your maps online at **<https://maputnik.github.io/editor/>** (all in local storage)
+- :link: Try out the v1.7.0-beta release at: https://maputnik.github.io/releases/v1.7.0-beta/
 - :link: Use the [Maputnik CLI](https://github.com/maputnik/editor/wiki/Maputnik-CLI) for local style development
 
-Mapbox has built one of the best and most amazing OSS ecosystems. A key component to ensure its longevity and independance is an OSS map designer.
+Mapbox has built one of the best and most amazing OSS ecosystems. A key component to ensure its longevity and independence is an OSS map designer.
+
+
+## Donations
+If you or your organisation has seen value from Maputnik, please consider donating at <https://maputnik.github.io/donate>
+
 
 ## Documentation
 
@@ -35,10 +41,7 @@ The documentation can be found in the [Wiki](https://github.com/maputnik/editor/
 
 Maputnik is written in ES6 and is using [React](https://github.com/facebook/react) and [Mapbox GL JS](https://www.mapbox.com/mapbox-gl-js/api/).
 
-We ensure building and developing Maputnik works with
-
-- Linux, OSX and Windows
-- Node >4
+We ensure building and developing Maputnik works with the [current active LTS Node.js version and above](https://github.com/nodejs/Release#release-schedule).
 
 Install the deps, start the dev server and open the web browser on `http://localhost:8888/`.
 
@@ -49,12 +52,18 @@ npm install
 npm start
 ```
 
-The build process will watch for changes to the filesystem, rebuild and autoreload the editor. However note this from the webpack-dev-server docs
+If you want Maputnik to be accessible externally use the [`--host` option](https://webpack.js.org/configuration/dev-server/#devserverhost):
 
-> webpack uses the file system to get notified of file changes. In some cases this does not work. For example, when using Network File System (NFS). Vagrant also has a lot of problems with this. 
-Snippet from <https://webpack.js.org/configuration/dev-server/#devserver-watchoptions->
+```bash
+# start externally accessible dev server
+npm start -- --host 0.0.0.0 
+```
 
-To enable polling add `export WEBPACK_DEV_SERVER_POLLING=1` to your enviroment.
+The build process will watch for changes to the filesystem, rebuild and autoreload the editor. However note this from the [webpack-dev-server docs](https://webpack.js.org/configuration/dev-server/):
+
+> webpack uses the file system to get notified of file changes. In some cases this does not work. For example, when using Network File System (NFS). Vagrant also has a lot of problems with this. ([snippet source](https://webpack.js.org/configuration/dev-server/#devserverwatchoptions-))
+
+To enable polling add `export WEBPACK_DEV_SERVER_POLLING=1` to your environment.
 
 ```
 npm run build
@@ -68,6 +77,33 @@ npm run lint
 npm run lint-styles
 ```
 
+
+## Tests
+For testing we use [webdriverio](http://webdriver.io) and [selenium-standalone](https://github.com/vvo/selenium-standalone)
+
+[selenium-standalone](https://github.com/vvo/selenium-standalone) starts a server that will launch browsers on your local machine. We use chrome so you **must** have chrome installed on your machine.
+
+Now open a terminal and run the following. This will install the drivers on your local machine
+
+```
+./node_modules/.bin/selenium-standalone install
+```
+
+Now start the standalone server
+
+```
+./node_modules/.bin/selenium-standalone start
+```
+
+Then open another terminal and run
+
+```
+npm test
+```
+
+After some time you should see a browser launch which will be automated by the test runner.
+
+
 ## Related Projects
 
 - [maputnik-dev-server](https://github.com/nycplanning/labs-maputnik-dev-server) - An express.js server that allows for quickly loading the style from any mapboxGL map into mapuntnik. 
@@ -83,13 +119,13 @@ Thanks to the supporters of the **[Kickstarter campaign](https://www.kickstarter
 - [Terranodo](http://terranodo.io/)
 
 <a href="https://getwemap.com/">
-  <img width="33%" alt="Wemap" style="display:inline" src="media/sponsors/wemap.jpg" />
+  <img width="33%" alt="Wemap" style="display:inline" src="https://cdn.jsdelivr.net/gh/maputnik/editor@1.5.0/media/sponsors/wemap.jpg" />
 </a>
 <a href="http://terranodo.io/">
-  <img width="33%" alt="Terranodo" style="display:inline" src="media/sponsors/terranodo.png" />
+  <img width="33%" alt="Terranodo" style="display:inline" src="https://cdn.jsdelivr.net/gh/maputnik/editor@1.5.0/media/sponsors/terranodo.png" />
 </a>
 <a href="https://www.orbiconinformatik.dk/">
-  <img width="32%" alt="Terranodo" style="display:inline" src="media/sponsors/orbicon_informatik.png" />
+  <img width="32%" alt="Terranodo" style="display:inline" src="https://cdn.jsdelivr.net/gh/maputnik/editor@1.5.0/media/sponsors/orbicon_informatik.png" />
 </a>
 
 <br/>
@@ -101,13 +137,13 @@ Thanks to the supporters of the **[Kickstarter campaign](https://www.kickstarter
 - [Dreipol](https://www.dreipol.ch/)
 
 <a href="https://www.klokantech.com/">
-  <img width="18%" alt="Klokan Technologies" style="display:inline-block" src="media/sponsors/klokantech.png" />
+  <img width="18%" alt="Klokan Technologies" style="display:inline-block" src="https://cdn.jsdelivr.net/gh/maputnik/editor@1.5.0/media/sponsors/klokantech.png" />
 </a>
 <a href="http://www.geofabrik.de/">
-  <img width="18%" alt="Geofabrik" style="display:inline-block" src="media/sponsors/geofabrik.png" />
+  <img width="18%" alt="Geofabrik" style="display:inline-block" src="https://cdn.jsdelivr.net/gh/maputnik/editor@1.5.0/media/sponsors/geofabrik.png" />
 </a>
 <a href="https://www.dreipol.ch/">
-  <img width="18%" alt="Dreipol" style="display:inline-block" src="media/sponsors/dreipol.png" />
+  <img width="18%" alt="Dreipol" style="display:inline-block" src="https://cdn.jsdelivr.net/gh/maputnik/editor@1.5.0/media/sponsors/dreipol.png" />
 </a>
 
 <br/>
@@ -130,6 +166,6 @@ Sina Martinelli, Nicholas Doiron, Neil Cawse, Urs42, Benedikt Groß, Manuel Roth
 
 Maputnik is [licensed under MIT](LICENSE) and is Copyright (c) Lukas Martinelli and contributors.
 
-**Disclaimer** This project is not affiliated with Mapbox or Mapbox Studio. It is a independent style editor for the
+**Disclaimer** This project is not affiliated with Mapbox or Mapbox Studio. It is an independent style editor for the
 open source technology in the Mapbox GL ecosystem.
 As contributor please take extra care of not violating any Mapbox trademarks. Do not get inspired by Mapbox Studio and make your own decisions for a good style editor.

appveyor.yml

@@ -1,19 +1,26 @@
+image: Visual Studio 2019
 environment:
   matrix:
-    - nodejs_version: "6"
-    - nodejs_version: "7"
-    - nodejs_version: "8"
-    - nodejs_version: "9"
+    - nodejs_version: "10"
+    - nodejs_version: "12"
+    - nodejs_version: "13"
 platform:
   - x86
   - x64
 install:
-  - ps: Install-Product node $env:nodejs_version
+  # https://github.com/appveyor/ci/issues/2921#issuecomment-501016533
+  - ps: |
+      try {
+      Install-Product node $env:nodejs_version $env:platform
+      } catch {
+      echo "Unable to install node $env:nodejs_version, trying update..."
+      Update-NodeJsInstallation (Get-NodeJsLatestBuild $env:nodejs_version) $env:platform
+      }
   - md public
-  - npm install --global --production windows-build-tools
+  - npm install --global windows-build-tools
   - npm install
 build_script:
   - npm run build
 test_script:
-  - npm run lint
-  - npm test
+  - npm run lint-js
+  - npm run lint-css

circle.yml

@@ -1,6 +0,0 @@
-machine:
-  node:
-    version: 6
-test:
-  post:
-    - npm run build

config/wdio.conf.js

@@ -1,48 +1,291 @@
 var webpack          = require("webpack");
 var WebpackDevServer = require("webpack-dev-server");
-var webpackConfig    = require("./webpack.production.config");
+var webpackConfig    = require("./webpack.config");
 var testConfig       = require("../test/config/specs");
+var artifacts        = require("../test/artifacts");
+var isDocker         = require("is-docker");
 
 
 var server;
+var SCREENSHOT_PATH = artifacts.pathSync("screenshots");
 
 exports.config = {
-  specs: [
-    './test/specs/**/*.js'
-  ],
-  exclude: [
-  ],
-  maxInstances: 10,
-  capabilities: [{
-    maxInstances: 5,
-    browserName: 'firefox'
-  }],
-  sync: true,
-  logLevel: 'verbose',
-  coloredLogs: true,
-  bail: 0,
-  screenshotPath: './errorShots/',
-  baseUrl: 'http://localhost',
-  waitforTimeout: 10000,
-  connectionRetryTimeout: 90000,
-  connectionRetryCount: 3,
-  services: ['phantomjs'],
-  framework: 'mocha',
-  reporters: ['spec'],
-  phantomjsOpts: {
-    webdriverLogfile: 'phantomjs.log'
-  },
-  mochaOpts: {
-    ui: 'bdd',
-    // Because we don't know how long the initial build will take...
-    timeout: 2*60*1000
-  },
-  onPrepare: function (config, capabilities) {
-    var compiler = webpack(webpackConfig);
-    server = new WebpackDevServer(compiler, {});
-    server.listen(testConfig.port);
-  },
-  onComplete: function(exitCode) {
-    server.close();
-  }
+    //
+    // ====================
+    // Runner Configuration
+    // ====================
+    //
+    // WebdriverIO allows it to run your tests in arbitrary locations (e.g. locally or
+    // on a remote machine).
+    runner: 'local',
+    //
+    // ==================
+    // Specify Test Files
+    // ==================
+    // Define which test specs should run. The pattern is relative to the directory
+    // from which `wdio` was called. Notice that, if you are calling `wdio` from an
+    // NPM script (see https://docs.npmjs.com/cli/run-script) then the current working
+    // directory is where your package.json resides, so `wdio` will be called from there.
+    //
+    specs: [
+        './test/functional/index.js'
+    ],
+    // Patterns to exclude.
+    exclude: [
+        // 'path/to/excluded/files'
+    ],
+    //
+    // ============
+    // Capabilities
+    // ============
+    // Define your capabilities here. WebdriverIO can run multiple capabilities at the same
+    // time. Depending on the number of capabilities, WebdriverIO launches several test
+    // sessions. Within your capabilities you can overwrite the spec and exclude options in
+    // order to group specific specs to a specific capability.
+    //
+    // First, you can define how many instances should be started at the same time. Let's
+    // say you have 3 different capabilities (Chrome, Firefox, and Safari) and you have
+    // set maxInstances to 1; wdio will spawn 3 processes. Therefore, if you have 10 spec
+    // files and you set maxInstances to 10, all spec files will get tested at the same time
+    // and 30 processes will get spawned. The property handles how many capabilities
+    // from the same test should run tests.
+    //
+    maxInstances: 10,
+    //
+    // If you have trouble getting all important capabilities together, check out the
+    // Sauce Labs platform configurator - a great tool to configure your capabilities:
+    // https://docs.saucelabs.com/reference/platforms-configurator
+    //
+    capabilities: [{
+        // maxInstances can get overwritten per capability. So if you have an in-house Selenium
+        // grid with only 5 firefox instances available you can make sure that not more than
+        // 5 instances get started at a time.
+        maxInstances: 5,
+        //
+        browserName: 'chrome',
+        // If outputDir is provided WebdriverIO can capture driver session logs
+        // it is possible to configure which logTypes to include/exclude.
+        // excludeDriverLogs: ['*'], // pass '*' to exclude all driver session logs
+        // excludeDriverLogs: ['bugreport', 'server'],
+    }],
+    //
+    // ===================
+    // Test Configurations
+    // ===================
+    // Define all options that are relevant for the WebdriverIO instance here
+    //
+    // Level of logging verbosity: trace | debug | info | warn | error | silent
+    logLevel: 'info',
+    //
+    // Set specific log levels per logger
+    // loggers:
+    // - webdriver, webdriverio
+    // - @wdio/applitools-service, @wdio/browserstack-service, @wdio/devtools-service, @wdio/sauce-service
+    // - @wdio/mocha-framework, @wdio/jasmine-framework
+    // - @wdio/local-runner, @wdio/lambda-runner
+    // - @wdio/sumologic-reporter
+    // - @wdio/cli, @wdio/config, @wdio/sync, @wdio/utils
+    // Level of logging verbosity: trace | debug | info | warn | error | silent
+    // logLevels: {
+        // webdriver: 'debug',
+        // '@wdio/applitools-service': 'info'
+    // },
+    //
+    // If you only want to run your tests until a specific amount of tests have failed use
+    // bail (default is 0 - don't bail, run all tests).
+    bail: 0,
+    //
+    screenshotPath: SCREENSHOT_PATH,
+    // Note: This is here because @orangemug currently runs Maputnik inside a docker container.
+    hostname: process.env.DOCKER_HOST || "0.0.0.0",
+    // Set a base URL in order to shorten url command calls. If your `url` parameter starts
+    // with `/`, the base url gets prepended, not including the path portion of your baseUrl.
+    // If your `url` parameter starts without a scheme or `/` (like `some/path`), the base url
+    // gets prepended directly.
+    baseUrl: 'http://localhost',
+    //
+    // Default timeout for all waitFor* commands.
+    waitforTimeout: 10000,
+    //
+    // Default timeout in milliseconds for request
+    // if Selenium Grid doesn't send response
+    connectionRetryTimeout: 90000,
+    //
+    // Default request retries count
+    connectionRetryCount: 3,
+    //
+    // Test runner services
+    // Services take over a specific job you don't want to take care of. They enhance
+    // your test setup with almost no effort. Unlike plugins, they don't add new
+    // commands. Instead, they hook themselves up into the test process.
+    //
+    // Framework you want to run your specs with.
+    // The following are supported: Mocha, Jasmine, and Cucumber
+    // see also: https://webdriver.io/docs/frameworks.html
+    //
+    // Make sure you have the wdio adapter package for the specific framework installed
+    // before running any tests.
+    framework: 'mocha',
+    //
+    // The number of times to retry the entire specfile when it fails as a whole
+    // specFileRetries: 1,
+    //
+    // Test reporter for stdout.
+    // The only one supported by default is 'dot'
+    // see also: https://webdriver.io/docs/dot-reporter.html
+    reporters: ['spec'],
+    
+    //
+    // Options to be passed to Mocha.
+    // See the full list at http://mochajs.org/
+    mochaOpts: {
+        ui: 'bdd',
+        // Because we don't know how long the initial build will take...
+        timeout: 4*60*1000
+    },
+    onPrepare: function (config, capabilities) {
+      return new Promise(function(resolve, reject) {
+        var compiler = webpack(webpackConfig);
+        const serverHost = isDocker() ? "0.0.0.0" : "localhost";
+
+        server = new WebpackDevServer(compiler, {
+          host: serverHost,
+          stats: {
+            colors: true
+          }
+        });
+
+        server.listen(testConfig.port, serverHost, function(err) {
+          if(err) {
+            reject(err);
+          }
+          else {
+            resolve();
+          }
+        });
+      })
+    },
+    onComplete: function(exitCode) {
+      server.close()
+    }
+    //
+    // =====
+    // Hooks
+    // =====
+    // WebdriverIO provides several hooks you can use to interfere with the test process in order to enhance
+    // it and to build services around it. You can either apply a single function or an array of
+    // methods to it. If one of them returns with a promise, WebdriverIO will wait until that promise got
+    // resolved to continue.
+    /**
+     * Gets executed once before all workers get launched.
+     * @param {Object} config wdio configuration object
+     * @param {Array.<Object>} capabilities list of capabilities details
+     */
+    // onPrepare: function (config, capabilities) {
+    // },
+    /**
+     * Gets executed just before initialising the webdriver session and test framework. It allows you
+     * to manipulate configurations depending on the capability or spec.
+     * @param {Object} config wdio configuration object
+     * @param {Array.<Object>} capabilities list of capabilities details
+     * @param {Array.<String>} specs List of spec file paths that are to be run
+     */
+    // beforeSession: function (config, capabilities, specs) {
+    // },
+    /**
+     * Gets executed before test execution begins. At this point you can access to all global
+     * variables like `browser`. It is the perfect place to define custom commands.
+     * @param {Array.<Object>} capabilities list of capabilities details
+     * @param {Array.<String>} specs List of spec file paths that are to be run
+     */
+    // before: function (capabilities, specs) {
+    // },
+    /**
+     * Runs before a WebdriverIO command gets executed.
+     * @param {String} commandName hook command name
+     * @param {Array} args arguments that command would receive
+     */
+    // beforeCommand: function (commandName, args) {
+    // },
+    
+    /**
+     * Hook that gets executed before the suite starts
+     * @param {Object} suite suite details
+     */
+    // beforeSuite: function (suite) {
+    // },
+    /**
+     * Function to be executed before a test (in Mocha/Jasmine) or a step (in Cucumber) starts.
+     * @param {Object} test test details
+     */
+    // beforeTest: function (test) {
+    // },
+    /**
+     * Hook that gets executed _before_ a hook within the suite starts (e.g. runs before calling
+     * beforeEach in Mocha)
+     */
+    // beforeHook: function () {
+    // },
+    /**
+     * Hook that gets executed _after_ a hook within the suite starts (e.g. runs after calling
+     * afterEach in Mocha)
+     */
+    // afterHook: function () {
+    // },
+    /**
+     * Function to be executed after a test (in Mocha/Jasmine) or a step (in Cucumber) starts.
+     * @param {Object} test test details
+     */
+    // afterTest: function (test) {
+    // },
+    /**
+     * Hook that gets executed after the suite has ended
+     * @param {Object} suite suite details
+     */
+    // afterSuite: function (suite) {
+    // },
+    
+    /**
+     * Runs after a WebdriverIO command gets executed
+     * @param {String} commandName hook command name
+     * @param {Array} args arguments that command would receive
+     * @param {Number} result 0 - command success, 1 - command error
+     * @param {Object} error error object if any
+     */
+    // afterCommand: function (commandName, args, result, error) {
+    // },
+    /**
+     * Gets executed after all tests are done. You still have access to all global variables from
+     * the test.
+     * @param {Number} result 0 - test pass, 1 - test fail
+     * @param {Array.<Object>} capabilities list of capabilities details
+     * @param {Array.<String>} specs List of spec file paths that ran
+     */
+    // after: function (result, capabilities, specs) {
+    // },
+    /**
+     * Gets executed right after terminating the webdriver session.
+     * @param {Object} config wdio configuration object
+     * @param {Array.<Object>} capabilities list of capabilities details
+     * @param {Array.<String>} specs List of spec file paths that ran
+     */
+    // afterSession: function (config, capabilities, specs) {
+    // },
+    /**
+     * Gets executed after all workers got shut down and the process is about to exit. An error
+     * thrown in the onComplete hook will result in the test run failing.
+     * @param {Object} exitCode 0 - success, 1 - fail
+     * @param {Object} config wdio configuration object
+     * @param {Array.<Object>} capabilities list of capabilities details
+     * @param {<Object>} results object containing test results
+     */
+    // onComplete: function(exitCode, config, capabilities, results) {
+    // },
+    /**
+    * Gets executed when a refresh happens.
+    * @param {String} oldSessionId session ID of the old session
+    * @param {String} newSessionId session ID of the new session
+    */
+    //onReload: function(oldSessionId, newSessionId) {
+    //}
 }

config/webpack.config.js

@@ -1,8 +1,9 @@
 "use strict";
 var webpack = require('webpack');
 var path = require('path');
-var loaders = require('./webpack.loaders');
+var rules = require('./webpack.rules');
 var HtmlWebpackPlugin = require('html-webpack-plugin');
+var HtmlWebpackInlineSVGPlugin = require('html-webpack-inline-svg-plugin');
 var CopyWebpackPlugin = require('copy-webpack-plugin');
 
 const HOST = process.env.HOST || "127.0.0.1";
@@ -10,6 +11,7 @@ const PORT = process.env.PORT || "8888";
 
 module.exports = {
   target: 'web',
+  mode: 'development',
   entry: [
     `webpack-dev-server/client?http://${HOST}:${PORT}`,
     `webpack/hot/only-dev-server`,
@@ -25,10 +27,9 @@ module.exports = {
   },
   module: {
     noParse: [
-      /mapbox-gl\/dist\/mapbox-gl.js/,
-      /openlayers\/dist\/ol.js/
+      /mapbox-gl\/dist\/mapbox-gl.js/
     ],
-    loaders: loaders
+    rules: rules
   },
   node: {
     fs: "empty",
@@ -61,6 +62,9 @@ module.exports = {
       title: 'Maputnik',
       template: './src/template.html'
     }),
+    new HtmlWebpackInlineSVGPlugin({
+      runPreEmit: true,
+    }),
     new CopyWebpackPlugin([
       {
         from: './src/manifest.json',

config/webpack.loaders.js

@@ -1,43 +0,0 @@
-module.exports = [
-  {
-    test: /\.jsx?$/,
-    exclude: /(node_modules|bower_components|public)/,
-    loaders: ['react-hot-loader/webpack']
-  },
-  {
-    test: /\.jsx?$/,
-    exclude: /(.*node_modules(?![\/\\]@mapbox[\/\\]mapbox-gl-style-spec)|bower_components|public)/,
-    loader: 'babel-loader',
-    query: {
-      presets: ['env', 'react'],
-      plugins: ['transform-runtime', 'transform-decorators-legacy', 'transform-class-properties'],
-    }
-  },
-  {
-    test: /\.(eot|ttf|woff|woff2)$/,
-    loader: 'file-loader?name=fonts/[name].[ext]'
-  },
-  {
-    test: /\.ico$/,
-    loader: 'file-loader?name=[name].[ext]'
-  },
-  {
-    test: /\.(svg|gif|jpg|png)$/,
-    loader: 'file-loader?name=img/[name].[ext]'
-  },
-  {
-    test: /\.json$/,
-    loader: 'json-loader'
-  },
-  {
-    test: /[\/\\](node_modules|global|src)[\/\\].*\.scss$/,
-    loaders: ["style-loader", "css-loader", "sass-loader"]
-  },
-  {
-    test: /[\/\\](node_modules|global|src)[\/\\].*\.css$/,
-    loaders: [
-      'style-loader?sourceMap',
-      'css-loader'
-    ]
-  }
-];

config/webpack.production.config.js

@@ -1,58 +1,32 @@
-
 var webpack = require('webpack');
 var path = require('path');
-var loaders = require('./webpack.loaders');
-var ExtractTextPlugin = require('extract-text-webpack-plugin');
+var rules = require('./webpack.rules');
 var HtmlWebpackPlugin = require('html-webpack-plugin');
+var HtmlWebpackInlineSVGPlugin = require('html-webpack-inline-svg-plugin');
 var WebpackCleanupPlugin = require('webpack-cleanup-plugin');
 var BundleAnalyzerPlugin = require('webpack-bundle-analyzer').BundleAnalyzerPlugin;
 var CopyWebpackPlugin = require('copy-webpack-plugin');
+var artifacts = require("../test/artifacts");
 
-var OUTPATH;
-if(process.env.CIRCLE_ARTIFACTS) {
-  OUTPATH = path.join(process.env.CIRCLE_ARTIFACTS, "build");
-}
-else {
-  OUTPATH = path.join(__dirname, '..', 'public');
-}
+var OUTPATH = artifacts.pathSync("/build");
 
 module.exports = {
   entry: {
     app: './src/index.jsx',
-    vendor: [
-        'file-saver',
-        'mapbox-gl/dist/mapbox-gl.js',
-        "lodash.clonedeep",
-        "lodash.throttle",
-        'color',
-        'react',
-        "react-dom",
-        "react-color",
-        "react-file-reader-input",
-        "react-collapse",
-        "react-height",
-        "react-icon-base",
-        "react-motion",
-        "react-sortable-hoc",
-        "request",
-        //TODO: Icons raise multi vendor errors?
-        //"react-icons",
-    ]
   },
   output: {
     path: OUTPATH,
-    filename: '[name].[chunkhash].js',
-    chunkFilename: '[chunkhash].js'
+    filename: '[name].[contenthash].js',
+    chunkFilename: '[contenthash].js'
   },
   resolve: {
     extensions: ['.js', '.jsx']
   },
   module: {
     noParse: [
-      /mapbox-gl\/dist\/mapbox-gl.js/,
-      /openlayers\/dist\/ol.js/
+      /mapbox-gl\/dist\/mapbox-gl.js/
     ],
-    loaders
+    rules: rules
   },
   node: {
     fs: "empty",
@@ -61,32 +35,25 @@ module.exports = {
   },
   plugins: [
     new webpack.NoEmitOnErrorsPlugin(),
-    new webpack.optimize.CommonsChunkPlugin({ name: 'vendor', filename: '[chunkhash].vendor.js' }),
     new WebpackCleanupPlugin(),
     new webpack.DefinePlugin({
       'process.env': {
         NODE_ENV: '"production"'
       }
     }),
-    new webpack.optimize.UglifyJsPlugin({
-      compress: {
-        warnings: false,
-        screw_ie8: true,
-      }
-    }),
-    new ExtractTextPlugin('[contenthash].css', {
-      allChunks: true
-    }),
     new HtmlWebpackPlugin({
       template: './src/template.html',
       title: 'Maputnik'
     }),
+    new HtmlWebpackInlineSVGPlugin({
+      runPreEmit: true,
+    }),
     new CopyWebpackPlugin([
       {
         from: './src/manifest.json',
         to: 'manifest.json'
-      }
-    ]),
+    }
+  ]),
     new BundleAnalyzerPlugin({
       analyzerMode: 'static',
       defaultSizes: 'gzip',

config/webpack.profiling.config.js

@@ -0,0 +1,20 @@
+const webpackProdConfig = require('./webpack.production.config');
+const artifacts = require("../test/artifacts");
+
+const OUTPATH = artifacts.pathSync("/profiling");
+
+module.exports = {
+  ...webpackProdConfig,
+  output: {
+    ...webpackProdConfig.output,
+    path: OUTPATH,
+  },
+  resolve: {
+    ...webpackProdConfig.resolve,
+    alias: {
+      ...webpackProdConfig.resolve.alias,
+      'react-dom$': 'react-dom/profiling',
+      'scheduler/tracing': 'scheduler/tracing-profiling',
+    }
+  }
+};

config/webpack.rules.js

@@ -0,0 +1,44 @@
+const path = require("path");
+
+module.exports = [
+  {
+    test: /\.jsx?$/,
+    exclude: [
+      path.resolve(__dirname, '../node_modules')
+    ],
+    use: 'babel-loader'
+  },
+  {
+    test: /\.(eot|ttf|woff|woff2)$/,
+    use: 'file-loader?name=fonts/[name].[ext]'
+  },
+  {
+    test: /\.ico$/,
+    use: 'file-loader?name=[name].[ext]'
+  },
+  {
+    test: /\.(gif|jpg|png)$/,
+    use: 'file-loader?name=img/[name].[ext]'
+  },
+  {
+    test: /\.svg$/,
+    use: [
+      'svg-inline-loader'
+    ]
+  },
+  {
+    test: /[\/\\](node_modules|global|src)[\/\\].*\.scss$/,
+    use: [
+      'style-loader',
+      "css-loader",
+      "sass-loader"
+    ]
+  },
+  {
+    test: /[\/\\](node_modules|global|src)[\/\\].*\.css$/,
+    use: [
+      'style-loader',
+      'css-loader'
+    ]
+  }
+];

package.json

@@ -1,16 +1,18 @@
 {
   "name": "maputnik",
-  "version": "1.1.0-beta2",
+  "version": "1.7.0-beta2",
   "description": "A MapboxGL visual style editor",
   "main": "''",
   "scripts": {
     "stats": "webpack --config config/webpack.production.config.js --profile --json > stats.json",
     "build": "webpack --config config/webpack.production.config.js --progress --profile --colors",
-    "test": "wdio config/wdio.conf.js",
-    "test-watch": "wdio config/wdio.conf.js --watch",
+    "profiling-build": "webpack --config config/webpack.profiling.config.js --progress --profile --colors",
+    "test": "cross-env NODE_ENV=test wdio config/wdio.conf.js",
+    "test-watch": "cross-env NODE_ENV=test wdio config/wdio.conf.js --watch",
     "start": "webpack-dev-server --progress --profile --colors --config config/webpack.config.js",
-    "lint": "eslint --ext js --ext jsx {src,test}",
-    "lint-styles": "stylelint 'src/styles/*.scss'"
+    "lint-js": "eslint --ext js --ext jsx src test",
+    "lint-css": "stylelint \"src/styles/*.scss\"",
+    "lint": "npm run lint-js && npm run lint-css"
   },
   "repository": {
     "type": "git",
@@ -20,48 +22,65 @@
   "license": "MIT",
   "homepage": "https://github.com/maputnik/editor#readme",
   "dependencies": {
-    "@mapbox/mapbox-gl-rtl-text": "^0.1.1",
-    "@mapbox/mapbox-gl-style-spec": "^10.0.1",
-    "classnames": "^2.2.5",
-    "codemirror": "^5.32.0",
-    "color": "^2.0.0",
-    "file-saver": "^1.3.3",
-    "github-api": "^3.0.0",
+    "@babel/runtime": "^7.8.4",
+    "@mapbox/mapbox-gl-rtl-text": "^0.2.3",
+    "@mapbox/mapbox-gl-style-spec": "^13.12.0",
+    "@mdi/react": "^1.4.0",
+    "array-move": "^2.2.1",
+    "classnames": "^2.2.6",
+    "codemirror": "^5.52.0",
+    "color": "^3.1.2",
+    "detect-browser": "^5.0.0",
+    "file-saver": "^2.0.2",
+    "json-to-ast": "^2.1.0",
     "jsonlint": "github:josdejong/jsonlint#85a19d7",
+    "lodash": "^4.17.15",
     "lodash.capitalize": "^4.2.1",
+    "lodash.clamp": "^4.0.3",
     "lodash.clonedeep": "^4.5.0",
+    "lodash.get": "^4.4.2",
     "lodash.isequal": "^4.5.0",
     "lodash.throttle": "^4.1.1",
-    "mapbox-gl": "^0.43.0",
-    "mapbox-gl-inspect": "^1.2.5",
-    "maputnik-design": "github:maputnik/design",
-    "mousetrap": "^1.6.1",
-    "ol-mapbox-style": "^1.0.1",
-    "openlayers": "^4.4.2",
-    "prop-types": "^15.6.0",
-    "react": "16.0.0",
-    "react-addons-pure-render-mixin": "^15.6.2",
-    "react-autocomplete": "^1.7.2",
-    "react-codemirror2": "^3.0.7",
-    "react-collapse": "^4.0.3",
-    "react-color": "^2.13.8",
-    "react-copy-to-clipboard": "^5.0.1",
-    "react-dom": "16.0.0",
-    "react-file-reader-input": "^1.1.4",
-    "react-height": "^3.0.0",
-    "react-icon-base": "^2.1.1",
-    "react-icons": "^2.2.7",
+    "mapbox-gl": "^1.9.1",
+    "mapbox-gl-inspect": "^1.3.1",
+    "maputnik-design": "github:maputnik/design#f7a2b4d",
+    "ol": "^6.3.1",
+    "ol-mapbox-style": "^6.0.1",
+    "prop-types": "^15.7.2",
+    "react": "^16.12.0",
+    "react-accessible-accordion": "^3.0.1",
+    "react-aria-menubutton": "^6.3.0",
+    "react-aria-modal": "^4.0.0",
+    "react-autobind": "^1.0.6",
+    "react-autocomplete": "^1.8.1",
+    "react-collapse": "^5.0.1",
+    "react-color": "^2.18.0",
+    "react-dom": "^16.12.0",
+    "react-file-reader-input": "^2.0.0",
+    "react-icon-base": "^2.1.2",
+    "react-icons": "^3.9.0",
     "react-motion": "^0.5.2",
-    "react-sortable-hoc": "^0.6.8",
-    "reconnecting-websocket": "^3.2.2",
-    "request": "^2.83.0",
+    "react-sortable-hoc": "^1.11.0",
+    "reconnecting-websocket": "^4.4.0",
+    "slugify": "^1.3.6",
     "url": "^0.11.0"
   },
   "jshintConfig": {
     "esversion": 6
   },
   "stylelint": {
-    "extends": "stylelint-config-standard"
+    "extends": "stylelint-config-recommended-scss",
+    "rules": {
+      "no-descending-specificity": null,
+      "media-feature-name-no-unknown": [
+        true,
+        {
+          "ignoreMediaFeatureNames": [
+            "prefers-reduced-motion"
+          ]
+        }
+      ]
+    }
   },
   "eslintConfig": {
     "plugins": [
@@ -84,50 +103,62 @@
         "experimentalObjectRestSpread": true,
         "jsx": true
       }
+    },
+    "settings": {
+      "react": {
+        "version": "detect"
+      }
     }
   },
   "devDependencies": {
-    "babel-core": "^6.26.0",
-    "babel-eslint": "^8.0.2",
-    "babel-loader": "7.1.1",
-    "babel-plugin-transform-class-properties": "^6.24.1",
-    "babel-plugin-transform-decorators-legacy": "^1.3.4",
-    "babel-plugin-transform-flow-strip-types": "^6.22.0",
-    "babel-plugin-transform-object-rest-spread": "^6.26.0",
-    "babel-plugin-transform-runtime": "^6.23.0",
-    "babel-preset-env": "^1.6.1",
-    "babel-preset-react": "^6.24.1",
-    "babel-runtime": "^6.26.0",
-    "base64-loader": "^1.0.0",
-    "copy-webpack-plugin": "^4.2.0",
-    "css-loader": "^0.28.7",
-    "eslint": "^4.10.0",
-    "eslint-plugin-react": "^7.4.0",
-    "extract-text-webpack-plugin": "^3.0.2",
-    "file-loader": "^1.1.5",
-    "html-webpack-plugin": "^2.30.1",
-    "json-loader": "^0.5.7",
-    "karma": "^1.7.1",
-    "karma-chrome-launcher": "^2.2.0",
-    "karma-firefox-launcher": "^1.0.1",
-    "karma-mocha": "^1.3.0",
-    "karma-webpack": "^2.0.5",
-    "mocha": "^4.0.1",
-    "mocha-loader": "^1.1.1",
-    "node-sass": "^4.6.0",
-    "react-hot-loader": "^3.1.1",
-    "sass-loader": "^6.0.6",
-    "style-loader": "^0.19.0",
-    "stylelint": "^7.13.0",
-    "stylelint-config-standard": "^15.0.1",
+    "@babel/core": "^7.8.4",
+    "@babel/plugin-proposal-class-properties": "^7.5.5",
+    "@babel/plugin-transform-runtime": "^7.6.2",
+    "@babel/preset-env": "^7.6.3",
+    "@babel/preset-flow": "^7.0.0",
+    "@babel/preset-react": "^7.6.3",
+    "@mdi/js": "^5.0.45",
+    "@wdio/cli": "^6.0.5",
+    "@wdio/local-runner": "^6.0.5",
+    "@wdio/mocha-framework": "^6.0.4",
+    "@wdio/selenium-standalone-service": "^6.0.4",
+    "@wdio/spec-reporter": "^6.0.4",
+    "@wdio/sync": "^6.0.1",
+    "babel-eslint": "^10.0.3",
+    "babel-loader": "^8.1.0",
+    "babel-plugin-istanbul": "^6.0.0",
+    "babel-plugin-static-fs": "^3.0.0",
+    "copy-webpack-plugin": "^5.1.1",
+    "cors": "^2.8.5",
+    "cross-env": "^7.0.0",
+    "css-loader": "^3.4.2",
+    "eslint": "^6.8.0",
+    "eslint-plugin-react": "^7.18.3",
+    "express": "^4.17.1",
+    "file-loader": "^6.0.0",
+    "html-webpack-inline-svg-plugin": "^1.3.0",
+    "html-webpack-plugin": "^3.2.0",
+    "is-docker": "^2.0.0",
+    "istanbul": "^0.4.5",
+    "istanbul-lib-coverage": "^3.0.0",
+    "mkdirp": "^1.0.4",
+    "mocha": "^7.0.1",
+    "node-sass": "^4.13.1",
+    "react-hot-loader": "^4.12.19",
+    "sass-loader": "^8.0.2",
+    "selenium-standalone": "^6.17.0",
+    "style-loader": "^1.1.3",
+    "stylelint": "^13.3.0",
+    "stylelint-config-recommended-scss": "^4.2.0",
+    "stylelint-scss": "^3.14.2",
+    "svg-inline-loader": "^0.8.2",
     "transform-loader": "^0.2.4",
-    "wdio-mocha-framework": "^0.5.11",
-    "wdio-phantomjs-service": "^0.2.2",
-    "wdio-spec-reporter": "^0.1.2",
-    "webdriverio": "^4.8.0",
-    "webpack": "^3.8.1",
-    "webpack-bundle-analyzer": "^2.9.0",
+    "uuid": "^7.0.3",
+    "webdriverio": "^6.0.5",
+    "webpack": "^4.41.6",
+    "webpack-bundle-analyzer": "^3.6.0",
     "webpack-cleanup-plugin": "^0.5.1",
-    "webpack-dev-server": "^2.9.4"
+    "webpack-cli": "^3.3.11",
+    "webpack-dev-server": "^3.10.3"
   }
 }

src/components/App.jsx

@@ -1,25 +1,78 @@
+import autoBind from 'react-autobind';
 import React from 'react'
-import Mousetrap from 'mousetrap'
+import cloneDeep from 'lodash.clonedeep'
+import clamp from 'lodash.clamp'
+import get from 'lodash.get'
+import {unset} from 'lodash'
+import arrayMove from 'array-move'
+import url from 'url'
 
 import MapboxGlMap from './map/MapboxGlMap'
-import OpenLayers3Map from './map/OpenLayers3Map'
+import OpenLayersMap from './map/OpenLayersMap'
 import LayerList from './layers/LayerList'
 import LayerEditor from './layers/LayerEditor'
 import Toolbar from './Toolbar'
 import AppLayout from './AppLayout'
 import MessagePanel from './MessagePanel'
 
+import SettingsModal from './modals/SettingsModal'
+import ExportModal from './modals/ExportModal'
+import SourcesModal from './modals/SourcesModal'
+import OpenModal from './modals/OpenModal'
+import ShortcutsModal from './modals/ShortcutsModal'
+import SurveyModal from './modals/SurveyModal'
+import DebugModal from './modals/DebugModal'
+
 import { downloadGlyphsMetadata, downloadSpriteMetadata } from '../libs/metadata'
-import styleSpec from '@mapbox/mapbox-gl-style-spec/style-spec'
-import style from '../libs/style.js'
-import { initialStyleUrl, loadStyleUrl } from '../libs/urlopen'
+import {latest, validate} from '@mapbox/mapbox-gl-style-spec'
+import style from '../libs/style'
+import { initialStyleUrl, loadStyleUrl, removeStyleQuerystring } from '../libs/urlopen'
 import { undoMessages, redoMessages } from '../libs/diffmessage'
-import { loadDefaultStyle, StyleStore } from '../libs/stylestore'
+import { StyleStore } from '../libs/stylestore'
 import { ApiStyleStore } from '../libs/apistore'
 import { RevisionStore } from '../libs/revisions'
 import LayerWatcher from '../libs/layerwatcher'
 import tokens from '../config/tokens.json'
 import isEqual from 'lodash.isequal'
+import Debug from '../libs/debug'
+import queryUtil from '../libs/query-util'
+import {formatLayerId} from './util/format';
+
+import MapboxGl from 'mapbox-gl'
+
+
+// Similar functionality as <https://github.com/mapbox/mapbox-gl-js/blob/7e30aadf5177486c2cfa14fe1790c60e217b5e56/src/util/mapbox.js>
+function normalizeSourceURL (url, apiToken="") {
+  const matches = url.match(/^mapbox:\/\/(.*)/);
+  if (matches) {
+    // mapbox://mapbox.mapbox-streets-v7
+    return `https://api.mapbox.com/v4/${matches[1]}.json?secure&access_token=${apiToken}`
+  }
+  else {
+    return url;
+  }
+}
+
+function setFetchAccessToken(url, mapStyle) {
+  const matchesTilehosting = url.match(/\.tilehosting\.com/);
+  const matchesMaptiler = url.match(/\.maptiler\.com/);
+  const matchesThunderforest = url.match(/\.thunderforest\.com/);
+  if (matchesTilehosting || matchesMaptiler) {
+    const accessToken = style.getAccessToken("openmaptiles", mapStyle, {allowFallback: true})
+    if (accessToken) {
+      return url.replace('{key}', accessToken)
+    }
+  }
+  else if (matchesThunderforest) {
+    const accessToken = style.getAccessToken("thunderforest", mapStyle, {allowFallback: true})
+    if (accessToken) {
+      return url.replace('{key}', accessToken)
+    }
+  }
+  else {
+    return url;
+  }
+}
 
 function updateRootSpec(spec, fieldName, newValues) {
   return {
@@ -37,25 +90,121 @@ function updateRootSpec(spec, fieldName, newValues) {
 export default class App extends React.Component {
   constructor(props) {
     super(props)
+    autoBind(this);
+
     this.revisionStore = new RevisionStore()
+    const params = new URLSearchParams(window.location.search.substring(1))
+    let port = params.get("localport")
+    if (port == null && (window.location.port != 80 && window.location.port != 443)) {
+      port = window.location.port
+    }
     this.styleStore = new ApiStyleStore({
-      onLocalStyleChange: mapStyle => this.onStyleChanged(mapStyle, false)
+      onLocalStyleChange: mapStyle => this.onStyleChanged(mapStyle, {save: false}),
+      port: port,
+      host: params.get("localhost")
+    })
+
+
+    const shortcuts = [
+      {
+        key: "?",
+        handler: () => {
+          this.toggleModal("shortcuts");
+        }
+      },
+      {
+        key: "o",
+        handler: () => {
+          this.toggleModal("open");
+        }
+      },
+      {
+        key: "e",
+        handler: () => {
+          this.toggleModal("export");
+        }
+      },
+      {
+        key: "d",
+        handler: () => {
+          this.toggleModal("sources");
+        }
+      },
+      {
+        key: "s",
+        handler: () => {
+          this.toggleModal("settings");
+        }
+      },
+      {
+        key: "i",
+        handler: () => {
+          this.setMapState(
+            this.state.mapState === "map" ? "inspect" : "map"
+          );
+        }
+      },
+      {
+        key: "m",
+        handler: () => {
+          document.querySelector(".mapboxgl-canvas").focus();
+        }
+      },
+      {
+        key: "!",
+        handler: () => {
+          this.toggleModal("debug");
+        }
+      },
+    ]
+
+    document.body.addEventListener("keyup", (e) => {
+      if(e.key === "Escape") {
+        e.target.blur();
+        document.body.focus();
+      }
+      else if(this.state.isOpen.shortcuts || document.activeElement === document.body) {
+        const shortcut = shortcuts.find((shortcut) => {
+          return (shortcut.key === e.key)
+        })
+
+        if(shortcut) {
+          this.setModal("shortcuts", false);
+          shortcut.handler(e);
+        }
+      }
     })
 
     const styleUrl = initialStyleUrl()
-    if(styleUrl) {
+    if(styleUrl && window.confirm("Load style from URL: " + styleUrl + " and discard current changes?")) {
       this.styleStore = new StyleStore()
       loadStyleUrl(styleUrl, mapStyle => this.onStyleChanged(mapStyle))
+      removeStyleQuerystring()
     } else {
+      if(styleUrl) {
+        removeStyleQuerystring()
+      }
       this.styleStore.init(err => {
         if(err) {
           console.log('Falling back to local storage for storing styles')
           this.styleStore = new StyleStore()
         }
         this.styleStore.latestStyle(mapStyle => this.onStyleChanged(mapStyle))
+
+        if(Debug.enabled()) {
+          Debug.set("maputnik", "styleStore", this.styleStore);
+          Debug.set("maputnik", "revisionStore", this.revisionStore);
+        }
       })
     }
 
+    if(Debug.enabled()) {
+      Debug.set("maputnik", "revisionStore", this.revisionStore);
+      Debug.set("maputnik", "styleStore", this.styleStore);
+    }
+
+    const queryObj = url.parse(window.location.href, true).query;
+
     this.state = {
       errors: [],
       infos: [],
@@ -63,8 +212,33 @@ export default class App extends React.Component {
       selectedLayerIndex: 0,
       sources: {},
       vectorLayers: {},
-      inspectModeEnabled: false,
-      spec: styleSpec.latest,
+      mapState: "map",
+      spec: latest,
+      mapView: {
+        zoom: 0,
+        center: {
+          lng: 0,
+          lat: 0,
+        },
+      },
+      isOpen: {
+        settings: false,
+        sources: false,
+        open: false,
+        shortcuts: false,
+        export: false,
+        // TODO: Disabled for now, this should be opened on the Nth visit to the editor
+        survey: false,
+        debug: false,
+      },
+      mapboxGlDebugOptions: {
+        showTileBoundaries: false,
+        showCollisionBoxes: false,
+        showOverdrawInspector: false,
+      },
+      openlayersDebugOptions: {
+        debugToolbox: false,
+      },
     }
 
     this.layerWatcher = new LayerWatcher({
@@ -72,20 +246,35 @@ export default class App extends React.Component {
     })
   }
 
+  handleKeyPress = (e) => {
+    if(navigator.platform.toUpperCase().indexOf('MAC') >= 0) {
+      if(e.metaKey && e.shiftKey && e.keyCode === 90) {
+        e.preventDefault();
+        this.onRedo(e);
+      }
+      else if(e.metaKey && e.keyCode === 90) {
+        e.preventDefault();
+        this.onUndo(e);
+      }
+    }
+    else {
+      if(e.ctrlKey && e.keyCode === 90) {
+        e.preventDefault();
+        this.onUndo(e);
+      }
+      else if(e.ctrlKey && e.keyCode === 89) {
+        e.preventDefault();
+        this.onRedo(e);
+      }
+    }
+  }
+
   componentDidMount() {
-    this.fetchSources();
-    Mousetrap.bind(['ctrl+z'], this.onUndo.bind(this));
-    Mousetrap.bind(['ctrl+y'], this.onRedo.bind(this));
+    window.addEventListener("keydown", this.handleKeyPress);
   }
 
   componentWillUnmount() {
-    Mousetrap.unbind(['ctrl+z'], this.onUndo.bind(this));
-    Mousetrap.unbind(['ctrl+y'], this.onRedo.bind(this));
-  }
-
-  onReset() {
-    this.styleStore.purge()
-    loadDefaultStyle(mapStyle => this.onStyleOpen(mapStyle))
+    window.removeEventListener("keydown", this.handleKeyPress);
   }
 
   saveStyle(snapshotStyle) {
@@ -95,7 +284,9 @@ export default class App extends React.Component {
   updateFonts(urlTemplate) {
     const metadata = this.state.mapStyle.metadata || {}
     const accessToken = metadata['maputnik:openmaptiles_access_token'] || tokens.openmaptiles
-    downloadGlyphsMetadata(urlTemplate.replace('{key}', accessToken), fonts => {
+
+    let glyphUrl = (typeof urlTemplate === 'string')? urlTemplate.replace('{key}', accessToken): urlTemplate;
+    downloadGlyphsMetadata(glyphUrl, fonts => {
       this.setState({ spec: updateRootSpec(this.state.spec, 'glyphs', fonts)})
     })
   }
@@ -106,7 +297,114 @@ export default class App extends React.Component {
     })
   }
 
-  onStyleChanged(newStyle, save=true) {
+  onChangeMetadataProperty = (property, value) => {
+    // If we're changing renderer reset the map state.
+    if (
+      property === 'maputnik:renderer' &&
+      value !== get(this.state.mapStyle, ['metadata', 'maputnik:renderer'], 'mbgljs')
+    ) {
+      this.setState({
+        mapState: 'map'
+      });
+    }
+
+    const changedStyle = {
+      ...this.state.mapStyle,
+      metadata: {
+        ...this.state.mapStyle.metadata,
+        [property]: value
+      }
+    }
+    this.onStyleChanged(changedStyle)
+  }
+
+  onStyleChanged = (newStyle, opts={}) => {
+    opts = {
+      save: true,
+      addRevision: true,
+      ...opts,
+    };
+
+    const errors = validate(newStyle, latest) || [];
+
+    // The validate function doesn't give us errors for duplicate error with
+    // empty string for layer.id, manually deal with that here.
+    const layerErrors = [];
+    if (newStyle && newStyle.layers) {
+      const foundLayers = new Map();
+      newStyle.layers.forEach((layer, index) => {
+        if (layer.id === "" && foundLayers.has(layer.id)) {
+          const message = `Duplicate layer: ${formatLayerId(layer.id)}`;
+          const error = new Error(
+            `layers[${index}]: duplicate layer id [empty_string], previously used`
+          );
+          layerErrors.push(error);
+        }
+        foundLayers.set(layer.id, true);
+      });
+    }
+
+    const mappedErrors = layerErrors.concat(errors).map(error => {
+      const dupMatch = error.message.match(/layers\[(\d+)\]: (duplicate layer id "?(.*)"?, previously used)/);
+      if (dupMatch) {
+        const [matchStr, index, message] = dupMatch;
+        return {
+          message: error.message,
+          parsed: {
+            type: "layer",
+            data: {
+              index: parseInt(index, 10),
+              key: "id",
+              message,
+            }
+          }
+        }
+      }
+
+      // duplicate layer id
+      const layerMatch = error.message.match(/layers\[(\d+)\]\.(?:(\S+)\.)?(\S+): (.*)/);
+      if (layerMatch) {
+        const [matchStr, index, group, property, message] = layerMatch;
+        const key = (group && property) ? [group, property].join(".") : property;
+        return {
+          message: error.message,
+          parsed: {
+            type: "layer",
+            data: {
+              index: parseInt(index, 10),
+              key,
+              message
+            }
+          }
+        }
+      }
+      else {
+        return {
+          message: error.message,
+        };
+      }
+    });
+
+    let dirtyMapStyle = undefined;
+    if (errors.length > 0) {
+      dirtyMapStyle = cloneDeep(newStyle);
+
+      errors.forEach(error => {
+        const {message} = error;
+        if (message) {
+          try {
+            const objPath = message.split(":")[0];
+            // Errors can be deply nested for example 'layers[0].filter[1][1][0]' we only care upto the property 'layers[0].filter'
+            const unsetPath = objPath.match(/^\S+?\[\d+\]\.[^\[]+/)[0];
+            unset(dirtyMapStyle, unsetPath);
+          }
+          catch (err) {
+            console.warn(err);
+          }
+        }
+      });
+    }
+
     if(newStyle.glyphs !== this.state.mapStyle.glyphs) {
       this.updateFonts(newStyle.glyphs)
     }
@@ -114,44 +412,60 @@ export default class App extends React.Component {
       this.updateIcons(newStyle.sprite)
     }
 
-    const errors = styleSpec.validate(newStyle, styleSpec.latest)
-    if(errors.length === 0) {
-      this.revisionStore.addRevision(newStyle)
-      if(save) this.saveStyle(newStyle)
-      this.setState({
-        mapStyle: newStyle,
-        errors: [],
-      })
-    } else {
-      this.setState({
-        errors: errors.map(err => err.message)
-      })
+    if (opts.addRevision) {
+      this.revisionStore.addRevision(newStyle);
     }
+    if (opts.save) {
+      this.saveStyle(newStyle);
+    }
+       
+    this.setState({
+      mapStyle: newStyle,
+      dirtyMapStyle: dirtyMapStyle,
+      errors: mappedErrors,
+    })
 
     this.fetchSources();
   }
 
-  onUndo() {
+  onUndo = () => {
     const activeStyle = this.revisionStore.undo()
+
     const messages = undoMessages(this.state.mapStyle, activeStyle)
-    this.saveStyle(activeStyle)
+    this.onStyleChanged(activeStyle, {addRevision: false});
     this.setState({
-      mapStyle: activeStyle,
       infos: messages,
     })
   }
 
-  onRedo() {
+  onRedo = () => {
     const activeStyle = this.revisionStore.redo()
     const messages = redoMessages(this.state.mapStyle, activeStyle)
-    this.saveStyle(activeStyle)
+    this.onStyleChanged(activeStyle, {addRevision: false});
     this.setState({
-      mapStyle: activeStyle,
       infos: messages,
     })
   }
 
-  onLayersChange(changedLayers) {
+  onMoveLayer = (move) => {
+    let { oldIndex, newIndex } = move;
+    let layers = this.state.mapStyle.layers;
+    oldIndex = clamp(oldIndex, 0, layers.length-1);
+    newIndex = clamp(newIndex, 0, layers.length-1);
+    if(oldIndex === newIndex) return;
+
+    if (oldIndex === this.state.selectedLayerIndex) {
+      this.setState({
+        selectedLayerIndex: newIndex
+      });
+    }
+
+    layers = layers.slice(0);
+    layers = arrayMove(layers, oldIndex, newIndex);
+    this.onLayersChange(layers);
+  }
+
+  onLayersChange = (changedLayers) => {
     const changedStyle = {
       ...this.state.mapStyle,
       layers: changedLayers
@@ -159,32 +473,81 @@ export default class App extends React.Component {
     this.onStyleChanged(changedStyle)
   }
 
-  onLayerIdChange(oldId, newId) {
-    const changedLayers = this.state.mapStyle.layers.slice(0)
-    const idx = style.indexOfLayer(changedLayers, oldId)
+  onLayerDestroy = (index) => {
+    let layers = this.state.mapStyle.layers;
+    const remainingLayers = layers.slice(0);
+    remainingLayers.splice(index, 1);
+    this.onLayersChange(remainingLayers);
+  }
 
-    changedLayers[idx] = {
-      ...changedLayers[idx],
+  onLayerCopy = (index) => {
+    let layers = this.state.mapStyle.layers;
+    const changedLayers = layers.slice(0)
+
+    const clonedLayer = cloneDeep(changedLayers[index])
+    clonedLayer.id = clonedLayer.id + "-copy"
+    changedLayers.splice(index, 0, clonedLayer)
+    this.onLayersChange(changedLayers)
+  }
+
+  onLayerVisibilityToggle = (index) => {
+    let layers = this.state.mapStyle.layers;
+    const changedLayers = layers.slice(0)
+
+    const layer = { ...changedLayers[index] }
+    const changedLayout = 'layout' in layer ? {...layer.layout} : {}
+    changedLayout.visibility = changedLayout.visibility === 'none' ? 'visible' : 'none'
+
+    layer.layout = changedLayout
+    changedLayers[index] = layer
+    this.onLayersChange(changedLayers)
+  }
+
+
+  onLayerIdChange = (index, oldId, newId) => {
+    const changedLayers = this.state.mapStyle.layers.slice(0)
+    changedLayers[index] = {
+      ...changedLayers[index],
       id: newId
     }
 
     this.onLayersChange(changedLayers)
   }
 
-  onLayerChanged(layer) {
+  onLayerChanged = (index, layer) => {
     const changedLayers = this.state.mapStyle.layers.slice(0)
-    const idx = style.indexOfLayer(changedLayers, layer.id)
-    changedLayers[idx] = layer
+    changedLayers[index] = layer
 
     this.onLayersChange(changedLayers)
   }
 
-  changeInspectMode() {
+  setMapState = (newState) => {
     this.setState({
-      inspectModeEnabled: !this.state.inspectModeEnabled
+      mapState: newState
     })
   }
 
+  setDefaultValues = (styleObj) => {
+    const metadata = styleObj.metadata || {}
+    if(metadata['maputnik:renderer'] === undefined) {
+      const changedStyle = {
+        ...styleObj,
+        metadata: {
+          ...styleObj.metadata,
+          'maputnik:renderer': 'mbgljs'
+        }
+      }
+      return changedStyle
+    } else {
+      return styleObj
+    }
+  }
+
+  openStyle = (styleObj) => {
+    styleObj = this.setDefaultValues(styleObj)
+    this.onStyleChanged(styleObj)
+  }
+
   fetchSources() {
     const sourceList = {...this.state.sources};
 
@@ -198,13 +561,31 @@ export default class App extends React.Component {
         layers: []
       };
 
-      if(!this.state.sources.hasOwnProperty(key) && val.type === "vector") {
-        const url = val.url;
-        fetch(url)
+      if(!this.state.sources.hasOwnProperty(key) && val.type === "vector" && val.hasOwnProperty("url")) {
+        let url = val.url;
+        try {
+          url = normalizeSourceURL(url, MapboxGl.accessToken);
+        } catch(err) {
+          console.warn("Failed to normalizeSourceURL: ", err);
+        }
+
+        try {
+          url = setFetchAccessToken(url, this.state.mapStyle)
+        } catch(err) {
+          console.warn("Failed to setFetchAccessToken: ", err);
+        }
+
+        fetch(url, {
+          mode: 'cors',
+        })
           .then((response) => {
             return response.json();
           })
           .then((json) => {
+            if(!json.hasOwnProperty("vector_layers")) {
+              return;
+            }
+
             // Create new objects before setState
             const sources = Object.assign({}, this.state.sources);
 
@@ -231,32 +612,106 @@ export default class App extends React.Component {
     }
   }
 
+  _getRenderer () {
+    const metadata = this.state.mapStyle.metadata || {};
+    return metadata['maputnik:renderer'] || 'mbgljs';
+  }
+
+  onMapChange = (mapView) => {
+    this.setState({
+      mapView,
+    });
+  }
+
   mapRenderer() {
+    const {mapStyle, dirtyMapStyle} = this.state;
+    const metadata = this.state.mapStyle.metadata || {};
+
     const mapProps = {
-      mapStyle: style.replaceAccessToken(this.state.mapStyle),
+      mapStyle: (dirtyMapStyle || mapStyle),
+      replaceAccessTokens: (mapStyle) => {
+        return style.replaceAccessTokens(mapStyle, {
+          allowFallback: true
+        });
+      },
       onDataChange: (e) => {
         this.layerWatcher.analyzeMap(e.map)
         this.fetchSources();
       },
     }
 
-    const metadata = this.state.mapStyle.metadata || {}
-    const renderer = metadata['maputnik:renderer'] || 'mbgljs'
+    const renderer = this._getRenderer();
 
-    // Check if OL3 code has been loaded?
-    if(renderer === 'ol3') {
-      return <OpenLayers3Map {...mapProps} />
+    let mapElement;
+
+    // Check if OL code has been loaded?
+    if(renderer === 'ol') {
+      mapElement = <OpenLayersMap
+        {...mapProps}
+        onChange={this.onMapChange}
+        debugToolbox={this.state.openlayersDebugOptions.debugToolbox}
+        onLayerSelect={this.onLayerSelect}
+      />
     } else {
-      return  <MapboxGlMap {...mapProps}
-        inspectModeEnabled={this.state.inspectModeEnabled}
+      mapElement = <MapboxGlMap {...mapProps}
+        onChange={this.onMapChange}
+        options={this.state.mapboxGlDebugOptions}
+        inspectModeEnabled={this.state.mapState === "inspect"}
         highlightedLayer={this.state.mapStyle.layers[this.state.selectedLayerIndex]}
-        onLayerSelect={this.onLayerSelect.bind(this)} />
+        onLayerSelect={this.onLayerSelect} />
     }
+
+    let filterName;
+    if(this.state.mapState.match(/^filter-/)) {
+      filterName = this.state.mapState.replace(/^filter-/, "");
+    }
+    const elementStyle = {};
+    if (filterName) {
+      elementStyle.filter = `url('#${filterName}')`;
+    };
+
+    return <div style={elementStyle} className="maputnik-map__container">
+      {mapElement}
+    </div>
   }
 
-  onLayerSelect(layerId) {
-    const idx = style.indexOfLayer(this.state.mapStyle.layers, layerId)
-    this.setState({ selectedLayerIndex: idx })
+  onLayerSelect = (index) => {
+    this.setState({ selectedLayerIndex: index })
+  }
+
+  setModal(modalName, value) {
+    if(modalName === 'survey' && value === false) {
+      localStorage.setItem('survey', '');
+    }
+
+    this.setState({
+      isOpen: {
+        ...this.state.isOpen,
+        [modalName]: value
+      }
+    })
+  }
+
+  toggleModal(modalName) {
+    this.setModal(modalName, !this.state.isOpen[modalName]);
+  }
+
+  onChangeOpenlayersDebug = (key, value) => {
+    this.setState({
+      openlayersDebugOptions: {
+        ...this.state.openlayersDebugOptions,
+        [key]: value,
+      }
+    });
+  }
+
+  onChangeMaboxGlDebug = (key, value) => {
+    this.setState({
+      mapboxGlDebugOptions: {
+        ...this.state.mapboxGlDebugOptions,
+        [key]: value,
+      }
+    });
   }
 
   render() {
@@ -265,42 +720,112 @@ export default class App extends React.Component {
     const metadata = this.state.mapStyle.metadata || {}
 
     const toolbar = <Toolbar
+      renderer={this._getRenderer()}
+      mapState={this.state.mapState}
       mapStyle={this.state.mapStyle}
-      inspectModeEnabled={this.state.inspectModeEnabled}
+      inspectModeEnabled={this.state.mapState === "inspect"}
       sources={this.state.sources}
-      onStyleChanged={this.onStyleChanged.bind(this)}
-      onStyleOpen={this.onStyleChanged.bind(this)}
-      onInspectModeToggle={this.changeInspectMode.bind(this)}
+      onStyleChanged={this.onStyleChanged}
+      onStyleOpen={this.onStyleChanged}
+      onSetMapState={this.setMapState}
+      onToggleModal={this.toggleModal.bind(this)}
     />
 
     const layerList = <LayerList
-      onLayersChange={this.onLayersChange.bind(this)}
-      onLayerSelect={this.onLayerSelect.bind(this)}
+      onMoveLayer={this.onMoveLayer}
+      onLayerDestroy={this.onLayerDestroy}
+      onLayerCopy={this.onLayerCopy}
+      onLayerVisibilityToggle={this.onLayerVisibilityToggle}
+      onLayersChange={this.onLayersChange}
+      onLayerSelect={this.onLayerSelect}
       selectedLayerIndex={this.state.selectedLayerIndex}
       layers={layers}
       sources={this.state.sources}
+      errors={this.state.errors}
     />
 
     const layerEditor = selectedLayer ? <LayerEditor
+      key={selectedLayer.id}
       layer={selectedLayer}
+      layerIndex={this.state.selectedLayerIndex}
+      isFirstLayer={this.state.selectedLayerIndex < 1}
+      isLastLayer={this.state.selectedLayerIndex === this.state.mapStyle.layers.length-1}
       sources={this.state.sources}
       vectorLayers={this.state.vectorLayers}
       spec={this.state.spec}
-      onLayerChanged={this.onLayerChanged.bind(this)}
-      onLayerIdChange={this.onLayerIdChange.bind(this)}
+      onMoveLayer={this.onMoveLayer}
+      onLayerChanged={this.onLayerChanged}
+      onLayerDestroy={this.onLayerDestroy}
+      onLayerCopy={this.onLayerCopy}
+      onLayerVisibilityToggle={this.onLayerVisibilityToggle}
+      onLayerIdChange={this.onLayerIdChange}
+      errors={this.state.errors}
     /> : null
 
     const bottomPanel = (this.state.errors.length + this.state.infos.length) > 0 ? <MessagePanel
+      currentLayer={selectedLayer}
+      selectedLayerIndex={this.state.selectedLayerIndex}
+      onLayerSelect={this.onLayerSelect}
+      mapStyle={this.state.mapStyle}
       errors={this.state.errors}
       infos={this.state.infos}
     /> : null
 
+
+    const modals = <div>
+      <DebugModal
+        renderer={this._getRenderer()}
+        mapboxGlDebugOptions={this.state.mapboxGlDebugOptions}
+        openlayersDebugOptions={this.state.openlayersDebugOptions}
+        onChangeMaboxGlDebug={this.onChangeMaboxGlDebug}
+        onChangeOpenlayersDebug={this.onChangeOpenlayersDebug}
+        isOpen={this.state.isOpen.debug}
+        onOpenToggle={this.toggleModal.bind(this, 'debug')}
+        mapView={this.state.mapView}
+      />
+      <ShortcutsModal
+        ref={(el) => this.shortcutEl = el}
+        isOpen={this.state.isOpen.shortcuts}
+        onOpenToggle={this.toggleModal.bind(this, 'shortcuts')}
+      />
+      <SettingsModal
+        mapStyle={this.state.mapStyle}
+        onStyleChanged={this.onStyleChanged}
+        onChangeMetadataProperty={this.onChangeMetadataProperty}
+        isOpen={this.state.isOpen.settings}
+        onOpenToggle={this.toggleModal.bind(this, 'settings')}
+        openlayersDebugOptions={this.state.openlayersDebugOptions}
+      />
+      <ExportModal
+        mapStyle={this.state.mapStyle}
+        onStyleChanged={this.onStyleChanged}
+        isOpen={this.state.isOpen.export}
+        onOpenToggle={this.toggleModal.bind(this, 'export')}
+      />
+      <OpenModal
+        isOpen={this.state.isOpen.open}
+        onStyleOpen={this.openStyle}
+        onOpenToggle={this.toggleModal.bind(this, 'open')}
+      />
+      <SourcesModal
+        mapStyle={this.state.mapStyle}
+        onStyleChanged={this.onStyleChanged}
+        isOpen={this.state.isOpen.sources}
+        onOpenToggle={this.toggleModal.bind(this, 'sources')}
+      />
+      <SurveyModal
+        isOpen={this.state.isOpen.survey}
+        onOpenToggle={this.toggleModal.bind(this, 'survey')}
+      />
+    </div>
+
     return <AppLayout
       toolbar={toolbar}
       layerList={layerList}
       layerEditor={layerEditor}
       map={this.mapRenderer()}
       bottom={bottomPanel}
+      modals={modals}
     />
   }
 }

src/components/AppLayout.jsx

@@ -9,6 +9,7 @@ class AppLayout extends React.Component {
     layerEditor: PropTypes.element,
     map: PropTypes.element.isRequired,
     bottom: PropTypes.element,
+    modals: PropTypes.node,
   }
 
   static childContextTypes = {
@@ -25,9 +26,7 @@ class AppLayout extends React.Component {
     return <div className="maputnik-layout">
       {this.props.toolbar}
       <div className="maputnik-layout-list">
-        <ScrollContainer>
-          {this.props.layerList}
-        </ScrollContainer>
+        {this.props.layerList}
       </div>
       <div className="maputnik-layout-drawer">
         <ScrollContainer>
@@ -39,6 +38,7 @@ class AppLayout extends React.Component {
           {this.props.bottom}
         </div>
       }
+      {this.props.modals}
     </div>
   }
 }

src/components/Button.jsx

@@ -4,19 +4,26 @@ import classnames from 'classnames'
 
 class Button extends React.Component {
   static propTypes = {
+    "data-wd-key": PropTypes.string,
+    "aria-label": PropTypes.string,
     onClick: PropTypes.func,
     style: PropTypes.object,
     className: PropTypes.string,
-    children: PropTypes.node
+    children: PropTypes.node,
+    disabled: PropTypes.bool,
   }
 
   render() {
-    return <a
+    return <button
       onClick={this.props.onClick}
+      disabled={this.props.disabled}
+      aria-label={this.props["aria-label"]}
       className={classnames("maputnik-button", this.props.className)}
-      style={this.props.style}>
+      data-wd-key={this.props["data-wd-key"]}
+      style={this.props.style}
+    >
       {this.props.children}
-    </a>
+    </button>
   }
 }
 

src/components/MessagePanel.jsx

@@ -1,15 +1,52 @@
 import React from 'react'
 import PropTypes from 'prop-types'
+import {formatLayerId} from './util/format';
 
 class MessagePanel extends React.Component {
   static propTypes = {
     errors: PropTypes.array,
     infos: PropTypes.array,
+    mapStyle: PropTypes.object,
+    onLayerSelect: PropTypes.func,
+    currentLayer: PropTypes.object,
+    selectedLayerIndex: PropTypes.number,
+  }
+
+  static defaultProps = {
+    onLayerSelect: () => {},
   }
 
   render() {
-    const errors = this.props.errors.map((m, i) => {
-      return <p key={"error-"+i} className="maputnik-message-panel-error">{m}</p>
+    const {selectedLayerIndex} = this.props;
+    const errors = this.props.errors.map((error, idx) => {
+      let content;
+      if (error.parsed && error.parsed.type === "layer") {
+        const {parsed} = error;
+        const {mapStyle, currentLayer} = this.props;
+        const layerId = mapStyle.layers[parsed.data.index].id;
+        content = (
+          <>
+            Layer <span>{formatLayerId(layerId)}</span>: {parsed.data.message}
+            {selectedLayerIndex !== parsed.data.index &&
+              <>
+                &nbsp;&mdash;&nbsp;
+                <button
+                  className="maputnik-message-panel__switch-button"
+                  onClick={() => this.props.onLayerSelect(parsed.data.index)}
+                >
+                  switch to layer
+                </button>
+              </>
+            }
+          </>
+        );
+      }
+      else {
+        content = error.message;
+      }
+      return <p key={"error-"+idx} className="maputnik-message-panel-error">
+        {content}
+      </p>
     })
 
     const infos = this.props.infos.map((m, i) => {

src/components/Toolbar.jsx

@@ -1,29 +1,19 @@
 import React from 'react'
 import PropTypes from 'prop-types'
-import FileReaderInput from 'react-file-reader-input'
 import classnames from 'classnames'
+import {detect} from 'detect-browser';
+
+import {MdFileDownload, MdOpenInBrowser, MdSettings, MdLayers, MdHelpOutline, MdFindInPage, MdAssignmentTurnedIn} from 'react-icons/md'
 
-import MdFileDownload from 'react-icons/lib/md/file-download'
-import MdFileUpload from 'react-icons/lib/md/file-upload'
-import OpenIcon from 'react-icons/lib/md/open-in-browser'
-import SettingsIcon from 'react-icons/lib/md/settings'
-import MdInfo from 'react-icons/lib/md/info'
-import SourcesIcon from 'react-icons/lib/md/layers'
-import MdSave from 'react-icons/lib/md/save'
-import MdStyle from 'react-icons/lib/md/style'
-import MdMap from 'react-icons/lib/md/map'
-import MdInsertEmoticon from 'react-icons/lib/md/insert-emoticon'
-import MdFontDownload from 'react-icons/lib/md/font-download'
-import HelpIcon from 'react-icons/lib/md/help-outline'
-import InspectionIcon from 'react-icons/lib/md/find-in-page'
 
 import logoImage from 'maputnik-design/logos/logo-color.svg'
-import SettingsModal from './modals/SettingsModal'
-import ExportModal from './modals/ExportModal'
-import SourcesModal from './modals/SourcesModal'
-import OpenModal from './modals/OpenModal'
+import pkgJson from '../../package.json'
+
+
+// This is required because of <https://stackoverflow.com/a/49846426>, there isn't another way to detect support that I'm aware of.
+const browser = detect();
+const colorAccessibilityFiltersEnabled = ['chrome', 'firefox'].indexOf(browser.name) > -1;
 
-import style from '../libs/style'
 
 class IconText extends React.Component {
   static propTypes = {
@@ -40,6 +30,7 @@ class ToolbarLink extends React.Component {
     className: PropTypes.string,
     children: PropTypes.node,
     href: PropTypes.string,
+    onToggleModal: PropTypes.func,
   }
 
   render() {
@@ -54,19 +45,59 @@ class ToolbarLink extends React.Component {
   }
 }
 
-class ToolbarAction extends React.Component {
+class ToolbarLinkHighlighted extends React.Component {
   static propTypes = {
+    className: PropTypes.string,
     children: PropTypes.node,
-    onClick: PropTypes.func
+    href: PropTypes.string,
+    onToggleModal: PropTypes.func
   }
 
   render() {
     return <a
+      className={classnames('maputnik-toolbar-link', "maputnik-toolbar-link--highlighted", this.props.className)}
+      href={this.props.href}
+      rel="noopener noreferrer"
+      target="_blank"
+    >
+      <span className="maputnik-toolbar-link-wrapper">
+        {this.props.children}
+      </span>
+    </a>
+  }
+}
+
+class ToolbarSelect extends React.Component {
+  static propTypes = {
+    children: PropTypes.node,
+    wdKey: PropTypes.string
+  }
+
+  render() {
+    return <div
+      className='maputnik-toolbar-select'
+      data-wd-key={this.props.wdKey}
+    >
+      {this.props.children}
+    </div>
+  }
+}
+
+class ToolbarAction extends React.Component {
+  static propTypes = {
+    children: PropTypes.node,
+    onClick: PropTypes.func,
+    wdKey: PropTypes.string
+  }
+
+  render() {
+    return <button
       className='maputnik-toolbar-action'
+      data-wd-key={this.props.wdKey}
       onClick={this.props.onClick}
     >
       {this.props.children}
-    </a>
+    </button>
   }
 }
 
@@ -79,93 +110,125 @@ export default class Toolbar extends React.Component {
     onStyleOpen: PropTypes.func.isRequired,
     // A dict of source id's and the available source layers
     sources: PropTypes.object.isRequired,
-    onInspectModeToggle: PropTypes.func.isRequired,
-    children: PropTypes.node
+    children: PropTypes.node,
+    onToggleModal: PropTypes.func,
+    onSetMapState: PropTypes.func,
+    mapState: PropTypes.string,
+    renderer: PropTypes.string,
   }
 
-  constructor(props) {
-    super(props)
-    this.state = {
-      isOpen: {
-        settings: false,
-        sources: false,
-        open: false,
-        add: false,
-        export: false,
-      }
+  state = {
+    isOpen: {
+      settings: false,
+      sources: false,
+      open: false,
+      add: false,
+      export: false,
     }
   }
 
-  toggleModal(modalName) {
-    this.setState({
-      isOpen: {
-        ...this.state.isOpen,
-        [modalName]: !this.state.isOpen[modalName]
-      }
-    })
+  handleSelection(val) {
+    this.props.onSetMapState(val);
   }
 
   render() {
+    const views = [
+      {
+        id: "map",
+        title: "Map",
+      },
+      {
+        id: "inspect",
+        title: "Inspect",
+        disabled: this.props.renderer !== 'mbgljs',
+      },
+      {
+        id: "filter-deuteranopia",
+        title: "Map (deuteranopia)",
+        disabled: !colorAccessibilityFiltersEnabled,
+      },
+      {
+        id: "filter-protanopia",
+        title: "Map (protanopia)",
+        disabled: !colorAccessibilityFiltersEnabled,
+      },
+      {
+        id: "filter-tritanopia",
+        title: "Map (tritanopia)",
+        disabled: !colorAccessibilityFiltersEnabled,
+      },
+      {
+        id: "filter-achromatopsia",
+        title: "Map (achromatopsia)",
+        disabled: !colorAccessibilityFiltersEnabled,
+      },
+    ];
+
+    const currentView = views.find((view) => {
+      return view.id === this.props.mapState;
+    });
+
     return <div className='maputnik-toolbar'>
-      <SettingsModal
-        mapStyle={this.props.mapStyle}
-        onStyleChanged={this.props.onStyleChanged}
-        isOpen={this.state.isOpen.settings}
-        onOpenToggle={this.toggleModal.bind(this, 'settings')}
-      />
-      <ExportModal
-        mapStyle={this.props.mapStyle}
-        onStyleChanged={this.props.onStyleChanged}
-        isOpen={this.state.isOpen.export}
-        onOpenToggle={this.toggleModal.bind(this, 'export')}
-      />
-      <OpenModal
-        isOpen={this.state.isOpen.open}
-        onStyleOpen={this.props.onStyleOpen}
-        onOpenToggle={this.toggleModal.bind(this, 'open')}
-      />
-      <SourcesModal
-          mapStyle={this.props.mapStyle}
-          onStyleChanged={this.props.onStyleChanged}
-          isOpen={this.state.isOpen.sources}
-          onOpenToggle={this.toggleModal.bind(this, 'sources')}
-      />
       <div className="maputnik-toolbar__inner">
-        <ToolbarLink
-          href={"https://github.com/maputnik/editor"}
-          className="maputnik-toolbar-logo"
+        <div
+          className="maputnik-toolbar-logo-container"
         >
-          <img src={logoImage} alt="Maputnik" />
-          <h1>Maputnik</h1>
-        </ToolbarLink>
+          <a className="maputnik-toolbar-skip" href="#skip-menu">
+            Skip navigation
+          </a>
+          <a
+            href="https://github.com/maputnik/editor"
+            rel="noopener noreferrer"
+            target="_blank"
+            className="maputnik-toolbar-logo"
+          >
+            <span dangerouslySetInnerHTML={{__html: logoImage}} />
+            <h1>
+              <span className="maputnik-toolbar-name">{pkgJson.name}</span>
+              <span className="maputnik-toolbar-version">v{pkgJson.version}</span>
+            </h1>
+          </a>
+        </div>
         <div className="maputnik-toolbar__actions">
-          <ToolbarAction onClick={this.toggleModal.bind(this, 'open')}>
-            <OpenIcon />
+          <ToolbarAction wdKey="nav:open" onClick={this.props.onToggleModal.bind(this, 'open')}>
+            <MdOpenInBrowser />
             <IconText>Open</IconText>
           </ToolbarAction>
-          <ToolbarAction onClick={this.toggleModal.bind(this, 'export')}>
+          <ToolbarAction wdKey="nav:export" onClick={this.props.onToggleModal.bind(this, 'export')}>
             <MdFileDownload />
             <IconText>Export</IconText>
           </ToolbarAction>
-          <ToolbarAction onClick={this.toggleModal.bind(this, 'sources')}>
-            <SourcesIcon />
-            <IconText>Sources</IconText>
+          <ToolbarAction wdKey="nav:sources" onClick={this.props.onToggleModal.bind(this, 'sources')}>
+            <MdLayers />
+            <IconText>Data Sources</IconText>
           </ToolbarAction>
-          <ToolbarAction onClick={this.toggleModal.bind(this, 'settings')}>
-            <SettingsIcon />
+          <ToolbarAction wdKey="nav:settings" onClick={this.props.onToggleModal.bind(this, 'settings')}>
+            <MdSettings />
             <IconText>Style Settings</IconText>
           </ToolbarAction>
-          <ToolbarAction onClick={this.props.onInspectModeToggle}>
-            <InspectionIcon />
-            <IconText>
-              { this.props.inspectModeEnabled && <span>Map Mode</span> }
-              { !this.props.inspectModeEnabled && <span>Inspect Mode</span> }
-            </IconText>
-          </ToolbarAction>
+
+          <ToolbarSelect wdKey="nav:inspect">
+            <MdFindInPage />
+            <IconText>View </IconText>
+            <select onChange={(e) => this.handleSelection(e.target.value)} value={currentView.id}>
+              {views.map((item) => {
+                return (
+                  <option key={item.id} value={item.id} disabled={item.disabled}>
+                    {item.title}
+                  </option>
+                );
+              })}
+            </select>
+          </ToolbarSelect>
+
           <ToolbarLink href={"https://github.com/maputnik/editor/wiki"}>
-            <HelpIcon />
+            <MdHelpOutline />
             <IconText>Help</IconText>
           </ToolbarLink>
+          <ToolbarLinkHighlighted href={"https://gregorywolanski.typeform.com/to/cPgaSY"}>
+            <MdAssignmentTurnedIn />
+            <IconText>Take the Maputnik Survey</IconText>
+          </ToolbarLinkHighlighted>
         </div>
       </div>
     </div>

src/components/fields/ColorField.jsx

@@ -2,6 +2,7 @@ import React from 'react'
 import Color from 'color'
 import ChromePicker from 'react-color/lib/components/chrome/Chrome'
 import PropTypes from 'prop-types'
+import lodash from 'lodash';
 
 function formatColor(color) {
   const rgb = color.rgb
@@ -12,24 +13,30 @@ function formatColor(color) {
 class ColorField extends React.Component {
   static propTypes = {
     onChange: PropTypes.func.isRequired,
-    name: PropTypes.string.isRequired,
+    name: PropTypes.string,
     value: PropTypes.string,
     doc: PropTypes.string,
     style: PropTypes.object,
     default: PropTypes.string,
   }
 
-  constructor(props) {
-    super(props)
-    this.state = {
-      pickerOpened: false,
-    }
+  state = {
+    pickerOpened: false
+  }
+
+  constructor () {
+    super();
+    this.onChangeNoCheck = lodash.throttle(this.onChangeNoCheck, 1000/30);
+  }
+
+  onChangeNoCheck (v) {
+    this.props.onChange(v);
   }
 
   //TODO: I much rather would do this with absolute positioning
   //but I am too stupid to get it to work together with fixed position
   //and scrollbars so I have to fallback to JavaScript
-  calcPickerOffset() {
+  calcPickerOffset = () => {
     const elem = this.colorInput
     if(elem) {
       const pos = elem.getBoundingClientRect()
@@ -45,7 +52,7 @@ class ColorField extends React.Component {
     }
   }
 
-  togglePicker() {
+  togglePicker = () => {
     this.setState({ pickerOpened: !this.state.pickerOpened })
   }
 
@@ -60,6 +67,10 @@ class ColorField extends React.Component {
     }
   }
 
+  onChange (v) {
+    this.props.onChange(v === "" ? undefined : v);
+  }
+
   render() {
     const offset = this.calcPickerOffset()
     var currentColor = this.color.object()
@@ -81,11 +92,11 @@ class ColorField extends React.Component {
       }}>
       <ChromePicker
         color={currentColor}
-        onChange={c => this.props.onChange(formatColor(c))}
+        onChange={c => this.onChangeNoCheck(formatColor(c))}
       />
       <div
         className="maputnik-color-picker-offset"
-        onClick={this.togglePicker.bind(this)}
+        onClick={this.togglePicker}
         style={{
           zIndex: -1,
           position: 'fixed',
@@ -105,14 +116,15 @@ class ColorField extends React.Component {
       {this.state.pickerOpened && picker}
       <div className="maputnik-color-swatch" style={swatchStyle}></div>
       <input
+        spellCheck="false"
         className="maputnik-color"
         ref={(input) => this.colorInput = input}
-        onClick={this.togglePicker.bind(this)}
+        onClick={this.togglePicker}
         style={this.props.style}
         name={this.props.name}
         placeholder={this.props.default}
         value={this.props.value ? this.props.value : ""}
-        onChange={(e) => this.props.onChange(e.target.value)}
+        onChange={(e) => this.onChange(e.target.value)}
       />
     </div>
   }

src/components/fields/DocLabel.jsx

@@ -1,23 +1,63 @@
 import React from 'react'
 import PropTypes from 'prop-types'
 
+import {MdInfoOutline, MdHighlightOff} from 'react-icons/md'
+
 export default class DocLabel extends React.Component {
   static propTypes = {
     label: PropTypes.oneOfType([
       PropTypes.object,
       PropTypes.string
     ]).isRequired,
-    doc: PropTypes.string.isRequired,
+    fieldSpec: PropTypes.object,
+    onToggleDoc: PropTypes.func,
+  }
+
+  constructor (props) {
+    super(props);
+    this.state = {
+      open: false,
+    }
+  }
+
+  onToggleDoc = (open) => {
+    this.setState({
+      open,
+    }, () => {
+      if (this.props.onToggleDoc) {
+        this.props.onToggleDoc(this.state.open);
+      }
+    });
   }
 
   render() {
-    return <label className="maputnik-doc-wrapper">
-      <div className="maputnik-doc-target">
-        <span>{this.props.label}</span>
-        <div className="maputnik-doc-popup">
-          {this.props.doc}
+    const {label, fieldSpec} = this.props;
+    const {doc} = fieldSpec || {};
+
+    if (doc) {
+      return <label className="maputnik-doc-wrapper">
+        <div className="maputnik-doc-target">
+          {label}
+          {'\xa0'}
+          <button
+            aria-label={this.state.open ? "close property documentation" : "open property documentation"}
+            className={`maputnik-doc-button maputnik-doc-button--${this.state.open ? 'open' : 'closed'}`}
+            onClick={() => this.onToggleDoc(!this.state.open)}
+          >
+            {this.state.open ? <MdHighlightOff /> : <MdInfoOutline />}
+          </button>
         </div>
-      </div >
-    </label>
+      </label>
+    }
+    else if (label) {
+      return <label className="maputnik-doc-wrapper">
+        <div className="maputnik-doc-target">
+          {label}
+        </div>
+      </label>
+    }
+    else {
+      <div />
+    }
   }
 }

src/components/fields/FunctionSpecField.jsx

@@ -4,14 +4,97 @@ import PropTypes from 'prop-types'
 import SpecProperty from './_SpecProperty'
 import DataProperty from './_DataProperty'
 import ZoomProperty from './_ZoomProperty'
+import ExpressionProperty from './_ExpressionProperty'
+import {function as styleFunction} from '@mapbox/mapbox-gl-style-spec';
 
 
+function isLiteralExpression (value) {
+  return (Array.isArray(value) && value.length === 2 && value[0] === "literal");
+}
+
 function isZoomField(value) {
-  return typeof value === 'object' && value.stops && typeof value.property === 'undefined'
+  return (
+    typeof(value) === 'object' &&
+    value.stops &&
+    typeof(value.property) === 'undefined' &&
+    Array.isArray(value.stops) &&
+    value.stops.length > 1 &&
+    value.stops.every(stop => {
+      return (
+        Array.isArray(stop) &&
+        stop.length === 2
+      );
+    })
+  );
 }
 
 function isDataField(value) {
-  return typeof value === 'object' && value.stops && typeof value.property !== 'undefined'
+  return (
+    typeof(value) === 'object' &&
+    value.stops &&
+    typeof(value.property) !== 'undefined' &&
+    value.stops.length > 1 &&
+    Array.isArray(value.stops) &&
+    value.stops.every(stop => {
+      return (
+        Array.isArray(stop) &&
+        stop.length === 2 &&
+        typeof(stop[0]) === 'object'
+      );
+    })
+  );
+}
+
+function isPrimative (value) {
+  const valid = ["string", "boolean", "number"];
+  return valid.includes(typeof(value));
+}
+
+function isArrayOfPrimatives (values) {
+  if (Array.isArray(values)) {
+    return values.every(isPrimative);
+  }
+  return false;
+}
+
+function getDataType (value, fieldSpec={}) {
+  if (value === undefined) {
+    return "value";
+  }
+  else if (isPrimative(value)) {
+    return "value";
+  }
+  else if (fieldSpec.type === "array" && isArrayOfPrimatives(value)) {
+    return "value";
+  }
+  else if (isZoomField(value)) {
+    return "zoom_function";
+  }
+  else if (isDataField(value)) {
+    return "data_function";
+  }
+  else {
+    return "expression";
+  }
+}
+
+/**
+ * If we don't have a default value just make one up
+ */
+function findDefaultFromSpec (spec) {
+  if (spec.hasOwnProperty('default')) {
+    return spec.default;
+  }
+
+  const defaults = {
+    'color': '#000000',
+    'string': '',
+    'boolean': false,
+    'number': 0,
+    'array': [],
+  }
+
+  return defaults[spec.type] || '';
 }
 
 /** Supports displaying spec field for zoom function objects
@@ -21,7 +104,9 @@ export default class FunctionSpecProperty  extends React.Component {
   static propTypes = {
       onChange: PropTypes.func.isRequired,
       fieldName: PropTypes.string.isRequired,
+      fieldType: PropTypes.string.isRequired,
       fieldSpec: PropTypes.object.isRequired,
+      errors: PropTypes.object,
 
       value: PropTypes.oneOfType([
       PropTypes.object,
@@ -32,7 +117,38 @@ export default class FunctionSpecProperty  extends React.Component {
     ]),
   }
 
-  addStop() {
+  constructor (props) {
+    super();
+    this.state = {
+      dataType: getDataType(props.value, props.fieldSpec),
+      isEditing: false,
+    }
+  }
+
+  static getDerivedStateFromProps(props, state) {
+    // Because otherwise when editing values we end up accidentally changing field type.
+    if (state.isEditing) {
+      return {};
+    }
+    else {
+      return {
+        isEditing: false,
+        dataType: getDataType(props.value, props.fieldSpec)
+      };
+    }
+  }
+
+  getFieldFunctionType(fieldSpec) {
+    if (fieldSpec.expression.interpolated) {
+      return "exponential"
+    }
+    if (fieldSpec.type === "number") {
+      return "interval"
+    }
+    return "categorical"
+  }
+
+  addStop = () => {
     const stops = this.props.value.stops.slice(0)
     const lastStop = stops[stops.length - 1]
     if (typeof lastStop[0] === "object") {
@@ -53,7 +169,15 @@ export default class FunctionSpecProperty  extends React.Component {
     this.props.onChange(this.props.fieldName, changedValue)
   }
 
-  deleteStop(stopIdx) {
+  deleteExpression = () => {
+    const {fieldSpec, fieldName} = this.props;
+    this.props.onChange(fieldName, fieldSpec.default);
+    this.setState({
+      dataType: "value",
+    });
+  }
+
+  deleteStop = (stopIdx) => {
     const stops = this.props.value.stops.slice(0)
     stops.splice(stopIdx, 1)
 
@@ -69,70 +193,139 @@ export default class FunctionSpecProperty  extends React.Component {
     this.props.onChange(this.props.fieldName, changedValue)
   }
 
-  makeZoomFunction() {
+  makeZoomFunction = () => {
     const zoomFunc = {
       stops: [
-        [6, this.props.value],
-        [10, this.props.value]
+        [6, this.props.value || findDefaultFromSpec(this.props.fieldSpec)],
+        [10, this.props.value || findDefaultFromSpec(this.props.fieldSpec)]
       ]
     }
     this.props.onChange(this.props.fieldName, zoomFunc)
   }
 
-  makeDataFunction() {
+  undoExpression = () => {
+    const {value, fieldName} = this.props;
+
+    if (isLiteralExpression(value)) {
+      this.props.onChange(fieldName, value[1]);
+      this.setState({
+        dataType: "value",
+      });
+    }
+  }
+
+  canUndo = () => {
+    const {value, fieldSpec} = this.props;
+    return (
+      isLiteralExpression(value) ||
+      isPrimative(value) ||
+      (Array.isArray(value) && fieldSpec.type === "array")
+    );
+  }
+
+  makeExpression = () => {
+    const {value, fieldSpec} = this.props;
+    let expression;
+
+    if (typeof(value) === "object" && 'stops' in value) {
+      expression = styleFunction.convertFunction(value, fieldSpec);
+    }
+    else {
+      expression = ["literal", value || this.props.fieldSpec.default];
+    }
+    this.props.onChange(this.props.fieldName, expression);
+  }
+
+  makeDataFunction = () => {
+    const functionType = this.getFieldFunctionType(this.props.fieldSpec);
+    const stopValue = functionType === 'categorical' ? '' : 0;
     const dataFunc = {
       property: "",
-      type: "categorical",
+      type: functionType,
       stops: [
-        [{zoom: 6, value: 0}, this.props.value],
-        [{zoom: 10, value: 0}, this.props.value]
+        [{zoom: 6, value: stopValue}, this.props.value || findDefaultFromSpec(this.props.fieldSpec)],
+        [{zoom: 10, value: stopValue}, this.props.value || findDefaultFromSpec(this.props.fieldSpec)]
       ]
     }
     this.props.onChange(this.props.fieldName, dataFunc)
   }
 
+  onMarkEditing = () => {
+    this.setState({isEditing: true});
+  }
+
+  onUnmarkEditing = () => {
+    this.setState({isEditing: false});
+  }
+
   render() {
+    const {dataType} = this.state;
     const propClass = this.props.fieldSpec.default === this.props.value ? "maputnik-default-property" : "maputnik-modified-property"
     let specField;
 
-    if (isZoomField(this.props.value)) {
+    if (dataType === "expression") {
       specField = (
-        <ZoomProperty
-          onChange={this.props.onChange.bind(this)}
+        <ExpressionProperty
+          errors={this.props.errors}
+          onChange={this.props.onChange.bind(this, this.props.fieldName)}
+          canUndo={this.canUndo}
+          onUndo={this.undoExpression}
+          onDelete={this.deleteExpression}
+          fieldType={this.props.fieldType}
           fieldName={this.props.fieldName}
           fieldSpec={this.props.fieldSpec}
           value={this.props.value}
-          onDeleteStop={this.deleteStop.bind(this)}
-          onAddStop={this.addStop.bind(this)}
+          onFocus={this.onMarkEditing}
+          onBlur={this.onUnmarkEditing}
+        />
+      );
+    }
+    else if (dataType === "zoom_function") {
+      specField = (
+        <ZoomProperty
+          errors={this.props.errors}
+          onChange={this.props.onChange.bind(this)}
+          fieldType={this.props.fieldType}
+          fieldName={this.props.fieldName}
+          fieldSpec={this.props.fieldSpec}
+          value={this.props.value}
+          onDeleteStop={this.deleteStop}
+          onAddStop={this.addStop}
+          onExpressionClick={this.makeExpression} 
         />
       )
     }
-    else if (isDataField(this.props.value)) {
+    else if (dataType === "data_function") {
       specField = (
         <DataProperty
+          errors={this.props.errors}
           onChange={this.props.onChange.bind(this)}
+          fieldType={this.props.fieldType}
           fieldName={this.props.fieldName}
           fieldSpec={this.props.fieldSpec}
           value={this.props.value}
-          onDeleteStop={this.deleteStop.bind(this)}
-          onAddStop={this.addStop.bind(this)}
+          onDeleteStop={this.deleteStop}
+          onAddStop={this.addStop}
+          onExpressionClick={this.makeExpression} 
         />
       )
     }
     else {
       specField = (
         <SpecProperty
+          errors={this.props.errors}
           onChange={this.props.onChange.bind(this)}
+          fieldType={this.props.fieldType}
           fieldName={this.props.fieldName}
           fieldSpec={this.props.fieldSpec}
           value={this.props.value}
-          onZoomClick={this.makeZoomFunction.bind(this)}
-          onDataClick={this.makeDataFunction.bind(this)} 
+          onZoomClick={this.makeZoomFunction}
+          onDataClick={this.makeDataFunction} 
+          onExpressionClick={this.makeExpression} 
         />
       )
     }
-
-    return <div className={propClass}>
+    return <div className={propClass} data-wd-key={"spec-field:"+this.props.fieldName}>
       {specField}
     </div>
   }

src/components/fields/PropertyGroup.jsx

@@ -40,26 +40,31 @@ export default class PropertyGroup extends React.Component {
     groupFields: PropTypes.array.isRequired,
     onChange: PropTypes.func.isRequired,
     spec: PropTypes.object.isRequired,
+    errors: PropTypes.object,
   }
 
-  onPropertyChange(property, newValue) {
+  onPropertyChange = (property, newValue) => {
     const group = getGroupName(this.props.spec, this.props.layer.type, property)
     this.props.onChange(group , property, newValue)
   }
 
   render() {
+    const {errors} = this.props;
     const fields = this.props.groupFields.map(fieldName => {
       const fieldSpec = getFieldSpec(this.props.spec, this.props.layer.type, fieldName)
 
       const paint = this.props.layer.paint || {}
       const layout = this.props.layer.layout || {}
       const fieldValue = fieldName in paint ? paint[fieldName] : layout[fieldName]
+      const fieldType = fieldName in paint ? 'paint' : 'layout';
 
       return <FunctionSpecField
-        onChange={this.onPropertyChange.bind(this)}
+        errors={errors}
+        onChange={this.onPropertyChange}
         key={fieldName}
         fieldName={fieldName}
-        value={fieldValue === undefined ? fieldSpec.default : fieldValue}
+        value={fieldValue}
+        fieldType={fieldType}
         fieldSpec={fieldSpec}
       />
     })

src/components/fields/SpecField.jsx

@@ -1,6 +1,5 @@
 import React from 'react'
 import PropTypes from 'prop-types'
-import color from 'color'
 
 import ColorField from './ColorField'
 import NumberInput from '../inputs/NumberInput'
@@ -12,6 +11,7 @@ import ArrayInput from '../inputs/ArrayInput'
 import DynamicArrayInput from '../inputs/DynamicArrayInput'
 import FontInput from '../inputs/FontInput'
 import IconInput from '../inputs/IconInput'
+import EnumInput from '../inputs/EnumInput'
 import capitalize from 'lodash.capitalize'
 
 const iconProperties = ['background-pattern', 'fill-pattern', 'line-pattern', 'fill-extrusion-pattern', 'icon-image']
@@ -58,70 +58,75 @@ export default class SpecField extends React.Component {
       name: this.props.fieldName,
       onChange: newValue => this.props.onChange(this.props.fieldName, newValue)
     }
-    switch(this.props.fieldSpec.type) {
-      case 'number': return (
-        <NumberInput
-          {...commonProps}
-          min={this.props.fieldSpec.minimum}
-          max={this.props.fieldSpec.maximum}
-        />
-      )
-      case 'enum':
-        const options = Object.keys(this.props.fieldSpec.values).map(v => [v, capitalize(v)])
 
-        if(options.length <= 3 && optionsLabelLength(options) <= 20) {
-          return <MultiButtonInput
+    function childNodes() {
+      switch(this.props.fieldSpec.type) {
+        case 'number': return (
+          <NumberInput
+            {...commonProps}
+            min={this.props.fieldSpec.minimum}
+            max={this.props.fieldSpec.maximum}
+          />
+        )
+        case 'enum':
+          const options = Object.keys(this.props.fieldSpec.values).map(v => [v, capitalize(v)])
+
+          return <EnumInput
             {...commonProps}
             options={options}
           />
-        } else {
-          return <SelectInput
-            {...commonProps}
-            options={options}
-          />
-        }
-      case 'string':
-        if(iconProperties.indexOf(this.props.fieldName) >= 0) {
-          return <IconInput
-            {...commonProps}
-            icons={this.props.fieldSpec.values}
-          />
-        } else {
-          return <StringInput
-            {...commonProps}
-          />
-        }
-      case 'color': return (
-        <ColorField
-          {...commonProps}
-        />
-      )
-      case 'boolean': return (
-        <CheckboxInput
-          {...commonProps}
-        />
-      )
-      case 'array':
-        if(this.props.fieldName === 'text-font') {
-          return <FontInput
-            {...commonProps}
-            fonts={this.props.fieldSpec.values}
-          />
-        } else {
-          if (this.props.fieldSpec.length) {
-            return <ArrayInput
+        case 'resolvedImage':
+        case 'formatted':
+        case 'string':
+          if(iconProperties.indexOf(this.props.fieldName) >= 0) {
+            return <IconInput
               {...commonProps}
-              type={this.props.fieldSpec.value}
-              length={this.props.fieldSpec.length}
+              icons={this.props.fieldSpec.values}
             />
           } else {
-            return <DynamicArrayInput
+            return <StringInput
               {...commonProps}
-              type={this.props.fieldSpec.value}
             />
           }
-        }
-      default: return null
+        case 'color': return (
+          <ColorField
+            {...commonProps}
+          />
+        )
+        case 'boolean': return (
+          <CheckboxInput
+            {...commonProps}
+          />
+        )
+        case 'array':
+          if(this.props.fieldName === 'text-font') {
+            return <FontInput
+              {...commonProps}
+              fonts={this.props.fieldSpec.values}
+            />
+          } else {
+            if (this.props.fieldSpec.length) {
+              return <ArrayInput
+                {...commonProps}
+                type={this.props.fieldSpec.value}
+                length={this.props.fieldSpec.length}
+              />
+            } else {
+              return <DynamicArrayInput
+                {...commonProps}
+                fieldSpec={this.props.fieldSpec}
+                type={this.props.fieldSpec.value}
+              />
+            }
+          }
+        default: return null
+      }
     }
+
+    return (
+      <div data-wd-key={"spec-field:"+this.props.fieldName}>
+      {childNodes.call(this)}
+      </div>
+    );
   }
 }

src/components/fields/_DataProperty.jsx

@@ -8,17 +8,40 @@ import StringInput from '../inputs/StringInput'
 import SelectInput from '../inputs/SelectInput'
 import DocLabel from './DocLabel'
 import InputBlock from '../inputs/InputBlock'
+import docUid from '../../libs/document-uid'
+import sortNumerically from '../../libs/sort-numerically'
 
 import labelFromFieldName from './_labelFromFieldName'
 import DeleteStopButton from './_DeleteStopButton'
 
 
+
+function setStopRefs(props, state) {
+  // This is initialsed below only if required to improved performance.
+  let newRefs;
+
+  if(props.value && props.value.stops) {
+    props.value.stops.forEach((val, idx) => {
+      if(!state.refs.hasOwnProperty(idx)) {
+        if(!newRefs) {
+          newRefs = {...state};
+        }
+        newRefs[idx] = docUid("stop-");
+      }
+    })
+  }
+
+  return newRefs;
+}
+
 export default class DataProperty extends React.Component {
   static propTypes = {
     onChange: PropTypes.func,
     onDeleteStop: PropTypes.func,
     onAddStop: PropTypes.func,
+    onExpressionClick: PropTypes.func,
     fieldName: PropTypes.string,
+    fieldType: PropTypes.string,
     fieldSpec: PropTypes.object,
     value: PropTypes.oneOfType([
       PropTypes.object,
@@ -27,10 +50,35 @@ export default class DataProperty extends React.Component {
       PropTypes.bool,
       PropTypes.array
     ]),
+    errors: PropTypes.object,
+  }
+
+  state = {
+    refs: {}
+  }
+
+  componentDidMount() {
+    const newRefs = setStopRefs(this.props, this.state);
+
+    if(newRefs) {
+      this.setState({
+        refs: newRefs
+      })
+    }
+  }
+
+  static getDerivedStateFromProps(props, state) {
+    const newRefs = setStopRefs(props, state);
+    if(newRefs) {
+      return {
+        refs: newRefs
+      };
+    }
+    return null;
   }
 
   getFieldFunctionType(fieldSpec) {
-    if (fieldSpec.function === "interpolated") {
+    if (fieldSpec.expression.interpolated) {
       return "exponential"
     }
     if (fieldSpec.type === "number") {
@@ -39,8 +87,8 @@ export default class DataProperty extends React.Component {
     return "categorical"
   }
 
-  getDataFunctionTypes(functionType) {
-    if (functionType === "interpolated") {
+  getDataFunctionTypes(fieldSpec) {
+    if (fieldSpec.expression.interpolated) {
       return ["categorical", "interval", "exponential"]
     }
     else {
@@ -48,13 +96,42 @@ export default class DataProperty extends React.Component {
     }
   }
 
+  // Order the stops altering the refs to reflect their new position.
+  orderStopsByZoom(stops) {
+    const mappedWithRef = stops
+      .map((stop, idx) => {
+        return {
+          ref: this.state.refs[idx],
+          data: stop
+        }
+      })
+      // Sort by zoom
+      .sort((a, b) => sortNumerically(a.data[0].zoom, b.data[0].zoom));
+
+    // Fetch the new position of the stops
+    const newRefs = {};
+    mappedWithRef
+      .forEach((stop, idx) =>{
+        newRefs[idx] = stop.ref;
+      })
+
+    this.setState({
+      refs: newRefs
+    });
+
+    return mappedWithRef.map((item) => item.data);
+  }
 
   changeStop(changeIdx, stopData, value) {
     const stops = this.props.value.stops.slice(0)
-    stops[changeIdx] = [stopData, value]
+    const changedStop = stopData.zoom === undefined ? stopData.value : stopData
+    stops[changeIdx] = [changedStop, value]
+
+    const orderedStops = this.orderStopsByZoom(stops);
+
     const changedValue = {
       ...this.props.value,
-      stops: stops,
+      stops: orderedStops,
     }
     this.props.onChange(this.props.fieldName, changedValue)
   }
@@ -70,13 +147,16 @@ export default class DataProperty extends React.Component {
   }
 
   render() {
+    const {fieldName, fieldType, errors} = this.props;
+
     if (typeof this.props.value.type === "undefined") {
       this.props.value.type = this.getFieldFunctionType(this.props.fieldSpec)
     }
 
     const dataFields = this.props.value.stops.map((stop, idx) => {
-      const zoomLevel = stop[0].zoom
-      const dataLevel = stop[0].value
+      const zoomLevel = typeof stop[0] === 'object' ? stop[0].zoom : undefined;
+      const key  = this.state.refs[idx];
+      const dataLevel = typeof stop[0] === 'object' ? stop[0].value : stop[0];
       const value = stop[1]
       const deleteStopBtn = <DeleteStopButton onClick={this.props.onDeleteStop.bind(this, idx)} />
 
@@ -94,8 +174,9 @@ export default class DataProperty extends React.Component {
         dataInput = <NumberInput {...dataProps} />
       }
 
-      return <InputBlock key={idx} action={deleteStopBtn} label="">
-        <div className="maputnik-data-spec-property-stop-edit">
+      let zoomInput = null;
+      if(zoomLevel !== undefined) {
+        zoomInput = <div className="maputnik-data-spec-property-stop-edit">
           <NumberInput
             value={zoomLevel}
             onChange={newZoom => this.changeStop(idx, {zoom: newZoom, value: dataLevel}, value)}
@@ -103,6 +184,25 @@ export default class DataProperty extends React.Component {
             max={22}
           />
         </div>
+      }
+
+      const errorKeyStart = `${fieldType}.${fieldName}.stops[${idx}]`;
+      const foundErrors = Object.entries(errors).filter(([key, error]) => {
+        return key.startsWith(errorKeyStart);
+      });
+
+      const message = foundErrors.map(([key, error]) => {
+        return error.message;
+      }).join("");
+      const error = message ? {message} : undefined;
+
+      return <InputBlock
+        error={error}
+        key={key}
+        action={deleteStopBtn}
+        label=""
+      >
+        {zoomInput}
         <div className="maputnik-data-spec-property-stop-data">
           {dataInput}
         </div>
@@ -118,52 +218,51 @@ export default class DataProperty extends React.Component {
     })
 
     return <div className="maputnik-data-spec-block">
-    <div className="maputnik-data-spec-property">
-      <InputBlock
-        doc={this.props.fieldSpec.doc}
-        label={labelFromFieldName(this.props.fieldName)}
-      >
-        <div className="maputnik-data-spec-property-group">
-          <DocLabel
-            label="Property"
-            doc={"Input a data property to base styles off of."}
-          />
-          <div className="maputnik-data-spec-property-input">
-            <StringInput
-              value={this.props.value.property}
-              onChange={propVal => this.changeDataProperty("property", propVal)}
+      <div className="maputnik-data-spec-property">
+        <InputBlock
+          fieldSpec={this.props.fieldSpec}
+          label={labelFromFieldName(this.props.fieldName)}
+        >
+          <div className="maputnik-data-spec-property-group">
+            <DocLabel
+              label="Property"
             />
+            <div className="maputnik-data-spec-property-input">
+              <StringInput
+                value={this.props.value.property}
+                title={"Input a data property to base styles off of."}
+                onChange={propVal => this.changeDataProperty("property", propVal)}
+              />
+            </div>
           </div>
-        </div>
-        <div className="maputnik-data-spec-property-group">
-          <DocLabel
-            label="Type"
-            doc={"Select a type of data scale (default is 'categorical')."}
-          />
-          <div className="maputnik-data-spec-property-input">
-            <SelectInput
-              value={this.props.value.type}
-              onChange={propVal => this.changeDataProperty("type", propVal)}
-              options={this.getDataFunctionTypes(this.props.fieldSpec.function)}
+          <div className="maputnik-data-spec-property-group">
+            <DocLabel
+              label="Type"
             />
+            <div className="maputnik-data-spec-property-input">
+              <SelectInput
+                value={this.props.value.type}
+                onChange={propVal => this.changeDataProperty("type", propVal)}
+                title={"Select a type of data scale (default is 'categorical')."}
+                options={this.getDataFunctionTypes(this.props.fieldSpec)}
+              />
+            </div>
           </div>
-        </div>
-        <div className="maputnik-data-spec-property-group">
-          <DocLabel
-            label="Default"
-            doc={"Input a default value for data if not covered by the scales."}
-          />
-          <div className="maputnik-data-spec-property-input">
-            <SpecField
-              fieldName={this.props.fieldName}
-              fieldSpec={this.props.fieldSpec}
-              value={this.props.value.default}
-              onChange={(_, propVal) => this.changeDataProperty("default", propVal)}
+          <div className="maputnik-data-spec-property-group">
+            <DocLabel
+              label="Default"
             />
+            <div className="maputnik-data-spec-property-input">
+              <SpecField
+                fieldName={this.props.fieldName}
+                fieldSpec={this.props.fieldSpec}
+                value={this.props.value.default}
+                onChange={(_, propVal) => this.changeDataProperty("default", propVal)}
+              />
+            </div>
           </div>
-        </div>
-      </InputBlock>
-    </div>
+        </InputBlock>
+      </div>
       {dataFields}
       <Button
         className="maputnik-add-stop"
@@ -171,6 +270,12 @@ export default class DataProperty extends React.Component {
       >
         Add stop
       </Button>
+      <Button
+        className="maputnik-add-stop"
+        onClick={this.props.onExpressionClick.bind(this)}
+      >
+        Convert to expression
+      </Button>
     </div>
   }
 }

src/components/fields/_DeleteStopButton.jsx

@@ -1,9 +1,8 @@
 import React from 'react'
 import PropTypes from 'prop-types'
 
-import DocLabel from './DocLabel'
 import Button from '../Button'
-import DeleteIcon from 'react-icons/lib/md/delete'
+import {MdDelete} from 'react-icons/md'
 
 
 export default class DeleteStopButton extends React.Component {
@@ -15,11 +14,9 @@ export default class DeleteStopButton extends React.Component {
     return <Button
       className="maputnik-delete-stop"
       onClick={this.props.onClick}
+      title={"Remove zoom level stop."}
     >
-      <DocLabel
-        label={<DeleteIcon />}
-        doc={"Remove zoom level stop."}
-      />
+      <MdDelete />
     </Button>
   }
 }

src/components/fields/_ExpressionProperty.jsx

@@ -0,0 +1,135 @@
+import React from 'react'
+import PropTypes from 'prop-types'
+
+import InputBlock from '../inputs/InputBlock'
+import Button from '../Button'
+import {MdDelete, MdUndo} from 'react-icons/md'
+import StringInput from '../inputs/StringInput'
+
+import labelFromFieldName from './_labelFromFieldName'
+import stringifyPretty from 'json-stringify-pretty-compact'
+import JSONEditor from '../layers/JSONEditor'
+
+
+export default class ExpressionProperty extends React.Component {
+  static propTypes = {
+    onDelete: PropTypes.func,
+    fieldName: PropTypes.string,
+    fieldType: PropTypes.string,
+    fieldSpec: PropTypes.object,
+    value: PropTypes.any,
+    errors: PropTypes.object,
+    onChange: PropTypes.func,
+    onUndo: PropTypes.func,
+    canUndo: PropTypes.func,
+    onFocus: PropTypes.func,
+    onBlur: PropTypes.func,
+  }
+
+  static defaultProps = {
+    errors: {},
+    onFocus: () => {},
+    onBlur: () => {},
+  }
+
+  constructor (props) {
+    super();
+    this.state = {
+      jsonError: false,
+    };
+  }
+
+  onJSONInvalid = (err) => {
+    this.setState({
+      jsonError: true,
+    })
+  }
+
+  onJSONValid = () => {
+    this.setState({
+      jsonError: false,
+    })
+  }
+
+  render() {
+    const {errors, fieldName, fieldType, value, canUndo} = this.props;
+    const {jsonError} = this.state;
+    const undoDisabled = canUndo ? !canUndo() : true;
+
+    const deleteStopBtn = (
+      <>
+        {this.props.onUndo &&
+          <Button
+            key="undo_action"
+            onClick={this.props.onUndo}
+            disabled={undoDisabled}
+            className="maputnik-delete-stop"
+          >
+            <MdUndo />
+          </Button>
+        }
+        <Button
+          key="delete_action"
+          onClick={this.props.onDelete}
+          className="maputnik-delete-stop"
+        >
+          <MdDelete />
+        </Button>
+      </>
+    );
+
+    const fieldKey = fieldType === undefined ? fieldName : `${fieldType}.${fieldName}`;
+
+    const fieldError = errors[fieldKey];
+    const errorKeyStart = `${fieldKey}[`;
+    const foundErrors = [];
+
+    function getValue (data) {
+      return stringifyPretty(data, {indent: 2, maxLength: 38})
+    }
+    
+    if (jsonError) {
+      foundErrors.push({message: "Invalid JSON"});
+    }
+    else {
+      Object.entries(errors)
+      .filter(([key, error]) => {
+        return key.startsWith(errorKeyStart);
+      })
+      .forEach(([key, error]) => {
+        return foundErrors.push(error);
+      })
+
+      if (fieldError) {
+        foundErrors.push(fieldError);
+      }
+    }
+
+    return <InputBlock
+      error={foundErrors}
+      fieldSpec={this.props.fieldSpec}
+      label={labelFromFieldName(this.props.fieldName)}
+      action={deleteStopBtn}
+      wideMode={true}
+    >
+      <JSONEditor
+        mode={{name: "mgl"}}
+        lint={{
+          context: "expression",
+          spec: this.props.fieldSpec,
+        }}
+        className="maputnik-expression-editor"
+        onFocus={this.props.onFocus}
+        onBlur={this.props.onBlur}
+        onJSONInvalid={this.onJSONInvalid}
+        onJSONValid={this.onJSONValid}
+        layer={value}
+        lineNumbers={false}
+        maxHeight={200}
+        lineWrapping={true}
+        getValue={getValue}
+        onChange={this.props.onChange}
+      />
+    </InputBlock>
+  }
+}

src/components/fields/_FunctionButtons.jsx

@@ -1,49 +1,77 @@
 import React from 'react'
 import PropTypes from 'prop-types'
 
-import DocLabel from './DocLabel'
 import Button from '../Button'
-import FunctionIcon from 'react-icons/lib/md/functions'
-import MdInsertChart from 'react-icons/lib/md/insert-chart'
+import {MdFunctions, MdInsertChart} from 'react-icons/md'
+import {mdiFunctionVariant} from '@mdi/js';
 
 
+/**
+ * So here we can't just check is `Array.isArray(value)` because certain
+ * properties accept arrays as values, for example `text-font`. So we must try
+ * and create an expression.
+ */
+function isExpression(value, fieldSpec={}) {
+  if (!Array.isArray(value)) {
+    return false;
+  }
+  try {
+    expression.createExpression(value, fieldSpec);
+    return true;
+  }
+  catch (err) {
+    return false;
+  }
+}
+
 export default class FunctionButtons extends React.Component {
   static propTypes = {
     fieldSpec: PropTypes.object,
     onZoomClick: PropTypes.func,
     onDataClick: PropTypes.func,
+    onExpressionClick: PropTypes.func,
   }
 
   render() {
-    let makeZoomButton, makeDataButton
-    if (this.props.fieldSpec['zoom-function']) {
+    let makeZoomButton, makeDataButton, expressionButton;
+
+    if (this.props.fieldSpec.expression.parameters.includes('zoom')) {
+      expressionButton = (
+        <Button
+          className="maputnik-make-zoom-function"
+          onClick={this.props.onExpressionClick}
+        >
+          <svg style={{width:"14px", height:"14px", verticalAlign: "middle"}} viewBox="0 0 24 24">
+            <path fill="currentColor" d={mdiFunctionVariant} />
+          </svg>
+        </Button>
+      );
+
       makeZoomButton = <Button
         className="maputnik-make-zoom-function"
         onClick={this.props.onZoomClick}
+        title={"Turn property into a zoom function to enable a map feature to change with map's zoom level."}
       >
-        <DocLabel
-          label={<FunctionIcon />}
-          cursorTargetStyle={{ cursor: 'pointer' }}
-          doc={"Turn property into a zoom function to enable a map feature to change with map's zoom level."}
-        />
+        <MdFunctions />
       </Button>
 
-      if (this.props.fieldSpec['property-function'] && ['piecewise-constant', 'interpolated'].indexOf(this.props.fieldSpec['function']) !== -1) {
+      if (this.props.fieldSpec['property-type'] === 'data-driven') {
         makeDataButton = <Button
           className="maputnik-make-data-function"
           onClick={this.props.onDataClick}
+          title={"Turn property into a data function to enable a map feature to change according to data properties and the map's zoom level."}
         >
-          <DocLabel
-            label={<MdInsertChart />}
-            cursorTargetStyle={{ cursor: 'pointer' }}
-            doc={"Turn property into a data function to enable a map feature to change according to data properties and the map's zoom level."}
-          />
+          <MdInsertChart />
         </Button>
       }
-      return <div>{makeDataButton}{makeZoomButton}</div>
+      return <div>
+        {expressionButton}
+        {makeDataButton}
+        {makeZoomButton}
+      </div>
     }
     else {
-      return null
+      return <div>{expressionButton}</div>
     }
   }
 }

src/components/fields/_SpecProperty.jsx

@@ -13,18 +13,33 @@ export default class SpecProperty extends React.Component {
     onZoomClick: PropTypes.func.isRequired,
     onDataClick: PropTypes.func.isRequired,
     fieldName: PropTypes.string,
-    fieldSpec: PropTypes.object
+    fieldType: PropTypes.string,
+    fieldSpec: PropTypes.object,
+    value: PropTypes.any,
+    errors: PropTypes.object,
+    onExpressionClick: PropTypes.func,
+  }
+
+  static defaultProps = {
+    errors: {},
   }
 
   render() {
+    const {errors, fieldName, fieldType} = this.props;
+
     const functionBtn = <FunctionButtons
       fieldSpec={this.props.fieldSpec}
       onZoomClick={this.props.onZoomClick}
       onDataClick={this.props.onDataClick} 
+      value={this.props.value}
+      onExpressionClick={this.props.onExpressionClick} 
     />
 
+    const error = errors[fieldType+"."+fieldName];
+
     return <InputBlock
-      doc={this.props.fieldSpec.doc}
+      error={error}
+      fieldSpec={this.props.fieldSpec}
       label={labelFromFieldName(this.props.fieldName)}
       action={functionBtn}
     >

src/components/fields/_ZoomProperty.jsx

@@ -13,13 +13,40 @@ import docUid from '../../libs/document-uid'
 import sortNumerically from '../../libs/sort-numerically'
 
 
+/**
+ * We cache a reference for each stop by its index.
+ *
+ * When the stops are reordered the references are also updated (see this.orderStops) this allows React to use the same key for the element and keep keyboard focus.
+ */
+function setStopRefs(props, state) {
+  // This is initialsed below only if required to improved performance.
+  let newRefs;
+
+  if(props.value && props.value.stops) {
+    props.value.stops.forEach((val, idx) => {
+      if(!state.refs.hasOwnProperty(idx)) {
+        if(!newRefs) {
+          newRefs = {...state};
+        }
+        newRefs[idx] = docUid("stop-");
+      }
+    })
+  }
+
+  return newRefs;
+}
+
+
 export default class ZoomProperty extends React.Component {
   static propTypes = {
     onChange: PropTypes.func,
     onDeleteStop: PropTypes.func,
     onAddStop: PropTypes.func,
+    onExpressionClick: PropTypes.func,
+    fieldType: PropTypes.string,
     fieldName: PropTypes.string,
     fieldSpec: PropTypes.object,
+    errors: PropTypes.object,
     value: PropTypes.oneOfType([
       PropTypes.object,
       PropTypes.string,
@@ -29,45 +56,17 @@ export default class ZoomProperty extends React.Component {
     ]),
   }
 
-
-  constructor() {
-    super()
-    this.state = {
-      refs: {}
-    }
+  static defaultProps = {
+    errors: {},
   }
 
-  componentWillMount() {
-    this.setState({
-      refs: this.setStopRefs(this.props)
-    })
+  state = {
+    refs: {}
   }
 
-  /**
-   * We cache a reference for each stop by its index.
-   *
-   * When the stops are reordered the references are also updated (see this.orderStops) this allows React to use the same key for the element and keep keyboard focus.
-   */
-  setStopRefs(props) {
-    // This is initialsed below only if required to improved performance.
-    let newRefs;
+  componentDidMount() {
+    const newRefs = setStopRefs(this.props, this.state);
 
-    if(props.value && props.value.stops) {
-      props.value.stops.forEach((val, idx) => {
-        if(!this.state.refs.hasOwnProperty(idx)) {
-          if(!newRefs) {
-            newRefs = {...this.state.refs};
-          }
-          newRefs[idx] = docUid("stop-");
-        }
-      })
-    }
-
-    return newRefs;
-  }
-
-  componentWillReceiveProps(nextProps) {
-    const newRefs = this.setStopRefs(nextProps);
     if(newRefs) {
       this.setState({
         refs: newRefs
@@ -75,6 +74,16 @@ export default class ZoomProperty extends React.Component {
     }
   }
 
+  static getDerivedStateFromProps(props, state) {
+    const newRefs = setStopRefs(props, state);
+    if(newRefs) {
+      return {
+        refs: newRefs
+      };
+    }
+    return null;
+  }
+
   // Order the stops altering the refs to reflect their new position.
   orderStopsByZoom(stops) {
     const mappedWithRef = stops
@@ -115,15 +124,28 @@ export default class ZoomProperty extends React.Component {
   }
 
   render() {
+    const {fieldName, fieldType, errors} = this.props;
+
     const zoomFields = this.props.value.stops.map((stop, idx) => {
       const zoomLevel = stop[0]
       const key  = this.state.refs[idx];
       const value = stop[1]
       const deleteStopBtn= <DeleteStopButton onClick={this.props.onDeleteStop.bind(this, idx)} />
 
+      const errorKeyStart = `${fieldType}.${fieldName}.stops[${idx}]`;
+      const foundErrors = Object.entries(errors).filter(([key, error]) => {
+        return key.startsWith(errorKeyStart);
+      });
+
+      const message = foundErrors.map(([key, error]) => {
+        return error.message;
+      }).join("");
+      const error = message ? {message} : undefined;
+
       return <InputBlock
+        error={error}
         key={key}
-        doc={this.props.fieldSpec.doc}
+        fieldSpec={this.props.fieldSpec}
         label={labelFromFieldName(this.props.fieldName)}
         action={deleteStopBtn}
       >
@@ -156,6 +178,12 @@ export default class ZoomProperty extends React.Component {
       >
         Add stop
       </Button>
+      <Button
+        className="maputnik-add-stop"
+        onClick={this.props.onExpressionClick.bind(this)}
+      >
+        Convert to expression
+      </Button>
     </div>
   }
 }

src/components/fields/_labelFromFieldName.js

@@ -1,6 +1,13 @@
 import capitalize from 'lodash.capitalize'
 
 export default function labelFromFieldName(fieldName) {
-  let label = fieldName.split('-').slice(1).join(' ')
-  return capitalize(label)
+  let label;
+  const parts = fieldName.split('-');
+  if (parts.length > 1) {
+    label = fieldName.split('-').slice(1).join(' ');
+  }
+  else {
+    label = fieldName;
+  }
+  return capitalize(label);
 }

src/components/filter/FilterEditor.jsx

@@ -2,15 +2,84 @@ import React from 'react'
 import PropTypes from 'prop-types'
 import { combiningFilterOps } from '../../libs/filterops.js'
 
-import styleSpec from '@mapbox/mapbox-gl-style-spec/style-spec'
+import {latest, validate, migrate} from '@mapbox/mapbox-gl-style-spec'
 import DocLabel from '../fields/DocLabel'
 import SelectInput from '../inputs/SelectInput'
+import InputBlock from '../inputs/InputBlock'
 import SingleFilterEditor from './SingleFilterEditor'
 import FilterEditorBlock from './FilterEditorBlock'
 import Button from '../Button'
+import SpecDoc from '../inputs/SpecDoc'
+import ExpressionProperty from '../fields/_ExpressionProperty';
+import {mdiFunctionVariant} from '@mdi/js';
 
-import DeleteIcon from 'react-icons/lib/md/delete'
-import AddIcon from 'react-icons/lib/fa/plus'
+
+function combiningFilter (props) {
+  let filter = props.filter || ['all'];
+
+  if (!Array.isArray(filter)) {
+    return filter;
+  }
+
+  let combiningOp = filter[0];
+  let filters = filter.slice(1);
+
+  if(combiningFilterOps.indexOf(combiningOp) < 0) {
+    combiningOp = 'all';
+    filters = [filter.slice(0)];
+  }
+
+  return [combiningOp, ...filters];
+}
+
+function migrateFilter (filter) {
+  return migrate(createStyleFromFilter(filter)).layers[0].filter;
+}
+
+function createStyleFromFilter (filter) {
+  return {
+    "id": "tmp",
+    "version": 8,
+    "name": "Empty Style",
+    "metadata": {"maputnik:renderer": "mbgljs"},
+    "sources": {
+      "tmp": {
+        "type": "geojson",
+        "data": {}
+      }
+    },
+    "sprite": "",
+    "glyphs": "https://orangemug.github.io/font-glyphs/glyphs/{fontstack}/{range}.pbf",
+    "layers": [
+      {
+        id: "tmp",
+        type: "fill",
+        source: "tmp",
+        filter: filter,
+      },
+    ],
+  };
+}
+
+/**
+ * This is doing way more work than we need it to, however validating a whole
+ * style if the only thing that's exported from mapbox-gl-style-spec at the
+ * moment. Not really an issue though as it take ~0.1ms to calculate.
+ */
+function checkIfSimpleFilter (filter) {
+  if (!filter || !combiningFilterOps.includes(filter[0])) {
+    return false;
+  }
+
+  // Because "none" isn't supported by the next expression syntax we can test
+  // with ["none", ...] because it'll return false if it's a new style
+  // expression.
+  const moddedFilter = ["none", ...filter.slice(1)];
+  const tmpStyle = createStyleFromFilter(moddedFilter)
+
+  const errors = validate(tmpStyle);
+  return (errors.length < 1);
+}
 
 function hasCombiningFilter(filter) {
   return combiningFilterOps.indexOf(filter[0]) >= 0
@@ -29,85 +98,212 @@ export default class CombiningFilterEditor extends React.Component {
     /** Properties of the vector layer and the available fields */
     properties: PropTypes.object,
     filter: PropTypes.array,
+    errors: PropTypes.object,
     onChange: PropTypes.func.isRequired,
   }
 
-  // Convert filter to combining filter
-  combiningFilter() {
-    let filter = this.props.filter || ['all']
-
-    let combiningOp = filter[0]
-    let filters = filter.slice(1)
-
-    if(combiningFilterOps.indexOf(combiningOp) < 0) {
-      combiningOp = 'all'
-      filters = [filter.slice(0)]
-    }
-
-    return [combiningOp, ...filters]
+  static defaultProps = {
+    filter: ["all"],
   }
 
+  constructor (props) {
+    super();
+    this.state = {
+      showDoc: false,
+      displaySimpleFilter: checkIfSimpleFilter(combiningFilter(props)),
+    };
+  }
+
+  // Convert filter to combining filter
   onFilterPartChanged(filterIdx, newPart) {
-    const newFilter = this.combiningFilter().slice(0)
+    const newFilter = combiningFilter(this.props).slice(0)
     newFilter[filterIdx] = newPart
     this.props.onChange(newFilter)
   }
 
   deleteFilterItem(filterIdx) {
-    const newFilter = this.combiningFilter().slice(0)
-    console.log('Delete', filterIdx, newFilter)
+    const newFilter = combiningFilter(this.props).slice(0)
     newFilter.splice(filterIdx + 1, 1)
     this.props.onChange(newFilter)
   }
 
-  addFilterItem() {
-    const newFilterItem = this.combiningFilter().slice(0)
+  addFilterItem = () => {
+    const newFilterItem = combiningFilter(this.props).slice(0)
     newFilterItem.push(['==', 'name', ''])
     this.props.onChange(newFilterItem)
   }
 
-  render() {
-    const filter = this.combiningFilter()
-    let combiningOp = filter[0]
-    let filters = filter.slice(1)
+  onToggleDoc = (val) => {
+    this.setState({
+      showDoc: val
+    });
+  }
 
-    const editorBlocks = filters.map((f, idx) => {
-      return <FilterEditorBlock key={idx} onDelete={this.deleteFilterItem.bind(this, idx)}>
-        <SingleFilterEditor
-          properties={this.props.properties}
-          filter={f}
-          onChange={this.onFilterPartChanged.bind(this, idx + 1)}
-        />
-      </FilterEditorBlock>
+  makeFilter = () => {
+    this.setState({
+      displaySimpleFilter: true,
     })
+  }
 
-    //TODO: Implement support for nested filter
-    if(hasNestedCombiningFilter(filter)) {
-      return <div className="maputnik-filter-editor-unsupported">
-        Nested filters are not supported.
-      </div>
+  makeExpression = () => {
+    let filter = combiningFilter(this.props);
+    this.props.onChange(migrateFilter(filter));
+    this.setState({
+      displaySimpleFilter: false,
+    })
+  }
+
+  static getDerivedStateFromProps (props, currentState) {
+    const {filter} = props;
+    const displaySimpleFilter = checkIfSimpleFilter(combiningFilter(props));
+
+    // Upgrade but never downgrade
+    if (!displaySimpleFilter && currentState.displaySimpleFilter === true) {
+      return {
+        displaySimpleFilter: false,
+        valueIsSimpleFilter: false,
+      };
     }
+    else if (displaySimpleFilter && currentState.displaySimpleFilter === false) {
+      return {
+        valueIsSimpleFilter: true,
+      }
+    }
+    else {
+      return {
+        valueIsSimpleFilter: false,
+      };
+    }
+  }
 
-    return <div className="maputnik-filter-editor">
-      <div className="maputnik-filter-editor-compound-select">
-        <DocLabel
-          label={"Compound Filter"}
-          doc={styleSpec.latest.layer.filter.doc + " Combine multiple filters together by using a compound filter."}
-        />
-        <SelectInput
-          value={combiningOp}
-          onChange={this.onFilterPartChanged.bind(this, 0)}
-          options={[["all", "every filter matches"], ["none", "no filter matches"], ["any", "any filter matches"]]}
-        />
-      </div>
-      {editorBlocks}
-      <div className="maputnik-filter-editor-add-wrapper">
+  render() {
+    const {errors} = this.props;
+    const {displaySimpleFilter} = this.state;
+    const fieldSpec={
+      doc: latest.layer.filter.doc + " Combine multiple filters together by using a compound filter."
+    };
+    const defaultFilter = ["all"];
+
+    const isNestedCombiningFilter = displaySimpleFilter && hasNestedCombiningFilter(combiningFilter(this.props));
+
+    if (isNestedCombiningFilter) {
+      return <div className="maputnik-filter-editor-unsupported">
+        <p>
+          Nested filters are not supported.
+        </p>
         <Button
-          className="maputnik-add-filter"
-          onClick={this.addFilterItem.bind(this)}>
-          Add filter
+          onClick={this.makeExpression}
+        >
+          <svg style={{marginRight: "0.2em", width:"14px", height:"14px", verticalAlign: "middle"}} viewBox="0 0 24 24">
+            <path fill="currentColor" d={mdiFunctionVariant} />
+          </svg>
+          Upgrade to expression
         </Button>
       </div>
-    </div>
+    }
+    else if (displaySimpleFilter) {
+      const filter = combiningFilter(this.props);
+      let combiningOp = filter[0];
+      let filters = filter.slice(1)
+
+      const actions = (
+        <div>
+          <Button
+            onClick={this.makeExpression}
+            className="maputnik-make-zoom-function"
+          >
+            <svg style={{width:"14px", height:"14px", verticalAlign: "middle"}} viewBox="0 0 24 24">
+              <path fill="currentColor" d={mdiFunctionVariant} />
+            </svg>
+          </Button>
+        </div>
+      );
+
+      const editorBlocks = filters.map((f, idx) => {
+        const error = errors[`filter[${idx+1}]`];
+
+        return (
+          <div key={`block-${idx}`}>
+            <FilterEditorBlock key={idx} onDelete={this.deleteFilterItem.bind(this, idx)}>
+              <SingleFilterEditor
+                properties={this.props.properties}
+                filter={f}
+                onChange={this.onFilterPartChanged.bind(this, idx + 1)}
+              />
+            </FilterEditorBlock>
+            {error &&
+              <div key="error" className="maputnik-inline-error">{error.message}</div>
+            }
+          </div>
+        );
+      })
+
+
+      return (
+        <>
+          <InputBlock
+            key="top"
+            fieldSpec={fieldSpec}
+            label={"Filter"}
+            action={actions}
+          >
+            <SelectInput
+              value={combiningOp}
+              onChange={this.onFilterPartChanged.bind(this, 0)}
+              options={[["all", "every filter matches"], ["none", "no filter matches"], ["any", "any filter matches"]]}
+            />
+          </InputBlock>
+          {editorBlocks}
+          <div
+            key="buttons"
+            className="maputnik-filter-editor-add-wrapper"
+          >
+            <Button
+              data-wd-key="layer-filter-button"
+              className="maputnik-add-filter"
+              onClick={this.addFilterItem}>
+              Add filter
+            </Button>
+          </div>
+          <div
+            key="doc"
+            className="maputnik-doc-inline"
+            style={{display: this.state.showDoc ? '' : 'none'}}
+          >
+            <SpecDoc fieldSpec={fieldSpec} />
+          </div>
+        </>
+      );
+    }
+    else {
+      let {filter} = this.props;
+
+      return (
+        <>
+          <ExpressionProperty
+            onDelete={() => {
+              this.setState({displaySimpleFilter: true});
+              this.props.onChange(defaultFilter);
+            }}
+            fieldName="filter"
+            fieldSpec={fieldSpec}
+            value={filter}
+            errors={errors}
+            onChange={this.props.onChange}
+          />
+          {this.state.valueIsSimpleFilter &&
+            <div className="maputnik-expr-infobox">
+              You&apos;ve entered a old style filter,{' '}
+              <button
+                onClick={this.makeFilter}
+                className="maputnik-expr-infobox__button"
+              >
+                switch to filter editor
+              </button>
+            </div>
+          }
+        </>
+      );
+    }
   }
 }

src/components/filter/FilterEditorBlock.jsx

@@ -1,7 +1,7 @@
 import React from 'react'
 import PropTypes from 'prop-types'
 import Button from '../Button'
-import DeleteIcon from 'react-icons/lib/md/delete'
+import {MdDelete} from 'react-icons/md'
 
 class FilterEditorBlock extends React.Component {
   static propTypes = {
@@ -16,7 +16,7 @@ class FilterEditorBlock extends React.Component {
           className="maputnik-delete-filter"
           onClick={this.props.onDelete}
         >
-          <DeleteIcon />
+          <MdDelete />
         </Button>
       </div>
       <div className="maputnik-filter-editor-block-content">

src/components/icons/LayerIcon.jsx

@@ -6,6 +6,7 @@ import FillIcon from './FillIcon.jsx'
 import SymbolIcon from './SymbolIcon.jsx'
 import BackgroundIcon from './BackgroundIcon.jsx'
 import CircleIcon from './CircleIcon.jsx'
+import MissingIcon from './MissingIcon.jsx'
 
 class LayerIcon extends React.Component {
   static propTypes = {
@@ -18,12 +19,14 @@ class LayerIcon extends React.Component {
     switch(this.props.type) {
       case 'fill-extrusion': return <BackgroundIcon {...iconProps} />
       case 'raster': return <FillIcon {...iconProps} />
+      case 'hillshade': return <FillIcon {...iconProps} />
+      case 'heatmap': return <FillIcon {...iconProps} />
       case 'fill': return <FillIcon {...iconProps} />
       case 'background': return <BackgroundIcon {...iconProps} />
       case 'line': return <LineIcon {...iconProps} />
       case 'symbol': return <SymbolIcon {...iconProps} />
       case 'circle': return <CircleIcon {...iconProps} />
-      default: return null
+      default: return <MissingIcon {...iconProps} />
     }
   }
 }

src/components/icons/MissingIcon.jsx

@@ -0,0 +1,11 @@
+import React from 'react'
+import {MdPriorityHigh} from 'react-icons/md'
+
+
+export default class MissingIcon extends React.Component {
+  render() {
+    return (
+      <MdPriorityHigh {...this.props} />
+    )
+  }
+}

src/components/inputs/ArrayInput.jsx

@@ -12,29 +12,89 @@ class ArrayInput extends React.Component {
     onChange: PropTypes.func,
   }
 
-  changeValue(idx, newValue) {
-    console.log(idx, newValue)
-    const values = this.values.slice(0)
-    values[idx] = newValue
-    this.props.onChange(values)
+  static defaultProps = {
+    value: [],
+    default: [],
   }
 
-  get values() {
-    return this.props.value || this.props.default || []
+  constructor (props) {
+    super(props);
+    this.state = {
+      value: this.props.value.slice(0),
+      // This is so we can compare changes in getDerivedStateFromProps
+      initialPropsValue: this.props.value.slice(0),
+    };
+  }
+
+  static getDerivedStateFromProps(props, state) {
+    const value = [];
+    const initialPropsValue = state.initialPropsValue.slice(0);
+
+    Array(props.length).fill(null).map((_, i) => {
+      if (props.value[i] === state.initialPropsValue[i]) {
+        value[i] = state.value[i];
+      }
+      else {
+        value[i] = state.value[i];
+        initialPropsValue[i] = state.value[i];
+      }
+    })
+
+    return {
+      value,
+      initialPropsValue,
+    };
+  }
+
+  isComplete (value) {
+    return Array(this.props.length).fill(null).every((_, i) => {
+      const val = value[i]
+      return !(val === undefined || val === "");
+    });
+  }
+
+  changeValue(idx, newValue) {
+    const value = this.state.value.slice(0);
+    value[idx] = newValue;
+
+    this.setState({
+      value,
+    }, () => {
+      if (this.isComplete(value)) {
+        this.props.onChange(value);
+      }
+      else {
+        // Unset until complete
+        this.props.onChange(undefined);
+      }
+    });
   }
 
   render() {
-    const inputs = this.values.map((v, i) => {
+    const {value} = this.state;
+
+    const containsValues = (
+      value.length > 0 &&
+      !value.every(val => {
+        return (val === "" || val === undefined)
+      })
+    );
+
+    const inputs = Array(this.props.length).fill(null).map((_, i) => {
       if(this.props.type === 'number') {
         return <NumberInput
           key={i}
-          value={v}
+          default={containsValues ? undefined : this.props.default[i]}
+          value={value[i]}
+          required={containsValues ? true : false}
           onChange={this.changeValue.bind(this, i)}
         />
       } else {
         return <StringInput
           key={i}
-          value={v}
+          default={containsValues ? undefined : this.props.default[i]}
+          value={value[i]}
+          required={containsValues ? true : false}
           onChange={this.changeValue.bind(this, i)}
         />
       }

src/components/inputs/AutocompleteInput.jsx

@@ -14,18 +14,15 @@ class AutocompleteInput extends React.Component {
     keepMenuWithinWindowBounds: PropTypes.bool
   }
 
+  state = {
+    maxHeight: MAX_HEIGHT
+  }
+
   static defaultProps = {
     onChange: () => {},
     options: [],
   }
 
-  constructor(props) {
-    super(props);
-    this.state = {
-      maxHeight: MAX_HEIGHT
-    };
-  }
-
   calcMaxHeight() {
     if(this.props.keepMenuWithinWindowBounds) {
       const maxHeight = window.innerHeight - this.autocompleteMenuEl.getBoundingClientRect().top;
@@ -38,6 +35,7 @@ class AutocompleteInput extends React.Component {
       }
     }
   }
+
   componentDidMount() {
     this.calcMaxHeight();
   }
@@ -46,6 +44,10 @@ class AutocompleteInput extends React.Component {
     this.calcMaxHeight();
   }
 
+  onChange (v) {
+    this.props.onChange(v === "" ? undefined : v);
+  }
+
   render() {
     return <div
       ref={(el) => {
@@ -54,24 +56,28 @@ class AutocompleteInput extends React.Component {
     >
       <Autocomplete
         menuStyle={{
-          position: "absolute",
+          position: "fixed",
           overflow: "auto",
-          maxHeight: this.state.maxHeight
+          maxHeight: this.state.maxHeight,
+          zIndex: '998'
         }}
         wrapperProps={{
           className: "maputnik-autocomplete",
           style: null
         }}
         inputProps={{
-          className: "maputnik-string"
+          className: "maputnik-string",
+          spellCheck: false
         }}
         value={this.props.value}
         items={this.props.options}
         getItemValue={(item) => item[0]}
-        onSelect={v => this.props.onChange(v)}
-        onChange={(e, v) => this.props.onChange(v)}
-        shouldItemRender={(item, value) => {
-          return item[0].toLowerCase().indexOf(value.toLowerCase()) > -1
+        onSelect={v => this.onChange(v)}
+        onChange={(e, v) => this.onChange(v)}
+        shouldItemRender={(item, value="") => {
+          if (typeof(value) === "string") {
+            return item[0].toLowerCase().indexOf(value.toLowerCase()) > -1
+          }
         }}
         renderItem={(item, isHighlighted) => (
           <div

src/components/inputs/CheckboxInput.jsx

@@ -3,11 +3,15 @@ import PropTypes from 'prop-types'
 
 class CheckboxInput extends React.Component {
   static propTypes = {
-    value: PropTypes.bool.isRequired,
+    value: PropTypes.bool,
     style: PropTypes.object,
     onChange: PropTypes.func,
   }
 
+  static defaultProps = {
+    value: false,
+  }
+
   render() {
     return <label className="maputnik-checkbox-wrapper">
       <input

src/components/inputs/DynamicArrayInput.jsx

@@ -3,8 +3,10 @@ import PropTypes from 'prop-types'
 import StringInput from './StringInput'
 import NumberInput from './NumberInput'
 import Button from '../Button'
-import DeleteIcon from 'react-icons/lib/md/delete'
+import {MdDelete} from 'react-icons/md'
 import DocLabel from '../fields/DocLabel'
+import EnumInput from '../inputs/SelectInput'
+import capitalize from 'lodash.capitalize'
 
 
 class DynamicArrayInput extends React.Component {
@@ -14,6 +16,7 @@ class DynamicArrayInput extends React.Component {
     default: PropTypes.array,
     onChange: PropTypes.func,
     style: PropTypes.object,
+    fieldSpec: PropTypes.object,
   }
 
   changeValue(idx, newValue) {
@@ -27,14 +30,18 @@ class DynamicArrayInput extends React.Component {
     return this.props.value || this.props.default || []
   }
 
-  addValue() {
+  addValue = () => {
     const values = this.values.slice(0)
     if (this.props.type === 'number') {
       values.push(0)
+    }
+    else if (this.props.type === 'enum') {
+      const {fieldSpec} = this.props;
+      const defaultValue = Object.keys(fieldSpec.values)[0];
+      values.push(defaultValue);
     } else {
       values.push("")
     }
-    
 
     this.props.onChange(values)
   }
@@ -49,15 +56,28 @@ class DynamicArrayInput extends React.Component {
   render() {
     const inputs = this.values.map((v, i) => {
       const deleteValueBtn= <DeleteValueButton onClick={this.deleteValue.bind(this, i)} />
-      const input = this.props.type === 'number' 
-        ? <NumberInput
+      let input;
+      if (this.props.type === 'number') {
+        input = <NumberInput
           value={v}
           onChange={this.changeValue.bind(this, i)}
         />
-        : <StringInput
+      }
+      else if (this.props.type === 'enum') {
+        const options = Object.keys(this.props.fieldSpec.values).map(v => [v, capitalize(v)]);
+
+        input = <EnumInput
+          options={options}
           value={v}
           onChange={this.changeValue.bind(this, i)}
         />
+      }
+      else {
+        input = <StringInput
+          value={v}
+          onChange={this.changeValue.bind(this, i)}
+        />
+      }
 
       return <div
         style={this.props.style}
@@ -77,7 +97,7 @@ class DynamicArrayInput extends React.Component {
       {inputs}
       <Button
         className="maputnik-array-add-value"
-        onClick={this.addValue.bind(this)}
+        onClick={this.addValue}
       >
         Add value
       </Button>
@@ -96,7 +116,7 @@ class DeleteValueButton extends React.Component {
       onClick={this.props.onClick}
     >
       <DocLabel
-        label={<DeleteIcon />}
+        label={<MdDelete />}
         doc={"Remove array entry."}
       />
     </Button>

src/components/inputs/EnumInput.jsx

@@ -0,0 +1,45 @@
+import React from 'react'
+import PropTypes from 'prop-types'
+import SelectInput from '../inputs/SelectInput'
+import MultiButtonInput from '../inputs/MultiButtonInput'
+
+
+function optionsLabelLength(options) {
+  let sum = 0;
+  options.forEach(([_, label]) => {
+    sum += label.length
+  })
+  return sum
+}
+
+
+class EnumInput extends React.Component {
+  static propTypes = {
+    "data-wd-key": PropTypes.string,
+    value: PropTypes.string,
+    style: PropTypes.object,
+    default: PropTypes.string,
+    onChange: PropTypes.func,
+    options: PropTypes.array,
+  }
+
+  render() {
+    const {options, value, onChange} = this.props;
+
+    if(options.length <= 3 && optionsLabelLength(options) <= 20) {
+      return <MultiButtonInput
+        options={options}
+        value={value || this.props.default}
+        onChange={onChange}
+      />
+    } else {
+      return <SelectInput
+        options={options}
+        value={value || this.props.default}
+        onChange={onChange}
+      />
+    }
+  }
+}
+
+export default EnumInput

src/components/inputs/FontInput.jsx

@@ -16,13 +16,25 @@ class FontInput extends React.Component {
   }
 
   get values() {
-   return this.props.value || this.props.default.slice(1) || []
+    const out = this.props.value || this.props.default.slice(1) || [""];
+
+    // Always put a "" in the last field to you can keep adding entries
+    if (out[out.length-1] !== ""){
+      return out.concat("");
+    }
+    else {
+      return out;
+    }
   }
 
   changeFont(idx, newValue) {
     const changedValues = this.values.slice(0)
     changedValues[idx] = newValue
-    this.props.onChange(changedValues)
+    const filteredValues = changedValues
+      .filter(v => v !== undefined)
+      .filter(v => v !== "")
+
+    this.props.onChange(filteredValues);
   }
 
   render() {

src/components/inputs/IconInput.jsx

@@ -5,7 +5,7 @@ import AutocompleteInput from './AutocompleteInput'
 
 class IconInput extends React.Component {
   static propTypes = {
-    value: PropTypes.array,
+    value: PropTypes.string,
     icons: PropTypes.array,
     style: PropTypes.object,
     onChange: PropTypes.func.isRequired,

src/components/inputs/InputBlock.jsx

@@ -2,42 +2,65 @@ import React from 'react'
 import PropTypes from 'prop-types'
 import classnames from 'classnames'
 import DocLabel from '../fields/DocLabel'
+import SpecDoc from './SpecDoc'
+
 
 /** Wrap a component with a label */
 class InputBlock extends React.Component {
   static propTypes = {
+    "data-wd-key": PropTypes.string,
     label: PropTypes.oneOfType([
       PropTypes.string,
       PropTypes.element,
     ]).isRequired,
-    doc: PropTypes.string,
     action: PropTypes.element,
     children: PropTypes.node.isRequired,
     style: PropTypes.object,
     onChange: PropTypes.func,
+    fieldSpec: PropTypes.object,
+    wideMode: PropTypes.bool,
+    error: PropTypes.array,
+  }
+
+  constructor (props) {
+    super(props);
+    this.state = {
+      showDoc: false,
+    }
   }
 
   onChange(e) {
     const value = e.target.value
-    return this.props.onChange(value === "" ? null: value)
+    return this.props.onChange(value === "" ? undefined : value)
+  }
+
+  onToggleDoc = (val) => {
+    this.setState({
+      showDoc: val
+    });
   }
 
   render() {
+    const errors = [].concat(this.props.error || []);
+
     return <div style={this.props.style}
+      data-wd-key={this.props["data-wd-key"]}
       className={classnames({
         "maputnik-input-block": true,
+        "maputnik-input-block--wide": this.props.wideMode,
         "maputnik-action-block": this.props.action
       })}
       >
-      {this.props.doc &&
+      {this.props.fieldSpec &&
       <div className="maputnik-input-block-label">
         <DocLabel
           label={this.props.label}
-          doc={this.props.doc}
+          onToggleDoc={this.onToggleDoc}
+          fieldSpec={this.props.fieldSpec}
         />
       </div>
       }
-      {!this.props.doc &&
+      {!this.props.fieldSpec &&
       <label className="maputnik-input-block-label">
         {this.props.label}
       </label>
@@ -50,6 +73,21 @@ class InputBlock extends React.Component {
       <div className="maputnik-input-block-content">
         {this.props.children}
       </div>
+      {errors.length > 0 &&
+        <div className="maputnik-inline-error">
+          {[].concat(this.props.error).map((error, idx) => {
+            return <div key={idx}>{error.message}</div>
+          })}
+        </div>
+      }
+      {this.props.fieldSpec &&
+      <div
+        className="maputnik-doc-inline"
+        style={{display: this.state.showDoc ? '' : 'none'}}
+      >
+        <SpecDoc fieldSpec={this.props.fieldSpec} />
+      </div>
+      }
     </div>
   }
 }

src/components/inputs/NumberInput.jsx

@@ -1,6 +1,8 @@
 import React from 'react'
 import PropTypes from 'prop-types'
 
+let IDX = 0;
+
 class NumberInput extends React.Component {
   static propTypes = {
     value: PropTypes.number,
@@ -8,31 +10,64 @@ class NumberInput extends React.Component {
     min: PropTypes.number,
     max: PropTypes.number,
     onChange: PropTypes.func,
+    allowRange: PropTypes.bool,
+    rangeStep: PropTypes.number,
+    wdKey: PropTypes.string,
+    required: PropTypes.bool,
+  }
+
+  static defaultProps = {
+    rangeStep: 1
   }
 
   constructor(props) {
     super(props)
     this.state = {
-      value: props.value
+      uuid: IDX++,
+      editing: false,
+      value: props.value,
+      dirtyValue: props.value,
     }
   }
 
-  componentWillReceiveProps(nextProps) {
-    this.setState({ value: nextProps.value })
+  static getDerivedStateFromProps(props, state) {
+    if (!state.editing && props.value !== state.value) {
+      return {
+        value: props.value,
+        dirtyValue: props.value,
+      };
+    }
+    return null;
   }
 
   changeValue(newValue) {
-    const value = parseFloat(newValue)
+    const value = (newValue === "" || newValue === undefined) ?
+      undefined :
+      parseFloat(newValue);
 
-    const hasChanged = this.state.value !== value
+    const hasChanged = this.props.value !== value;
     if(this.isValid(value) && hasChanged) {
       this.props.onChange(value)
-    } else {
-      this.setState({ value: newValue })
+      this.setState({
+        value: newValue,
+      });
     }
+    else if (!this.isValid(value) && hasChanged) {
+      this.setState({
+        value: undefined,
+      });
+    }
+
+    this.setState({
+      dirtyValue: newValue === "" ? undefined : newValue,
+    })
   }
 
   isValid(v) {
+    if (v === undefined) {
+      return true;
+    }
+
     const value = parseFloat(v)
     if(isNaN(value)) {
       return false
@@ -49,30 +84,149 @@ class NumberInput extends React.Component {
     return true
   }
 
-  resetValue() {
+  resetValue = () => {
+    this.setState({editing: false});
     // Reset explicitly to default value if value has been cleared
     if(this.state.value === "") {
-      return this.changeValue(this.props.default)
+      return;
     }
 
     // If set value is invalid fall back to the last valid value from props or at last resort the default value
-    if(!this.isValid(this.state.value)) {
+    if (!this.isValid(this.state.value)) {
       if(this.isValid(this.props.value)) {
         this.changeValue(this.props.value)
+        this.setState({dirtyValue: this.props.value});
       } else {
-        this.changeValue(this.props.default)
+        this.changeValue(undefined);
+        this.setState({dirtyValue: undefined});
       }
     }
   }
 
+  onChangeRange = (e) => {
+    let value = parseFloat(e.target.value, 10);
+    const step = this.props.rangeStep;
+    let dirtyValue = value;
+
+    if(step) {
+      // Can't do this with the <input/> range step attribute else we won't be able to set a high precision value via the text input.
+      const snap = value % step;
+
+      // Round up/down to step
+      if (this._keyboardEvent) {
+        // If it's keyboard event we might get a low positive/negative value,
+        // for example we might go from 13 to 13.23, however because we know
+        // that came from a keyboard event we always want to increase by a
+        // single step value.
+        if (value < this.state.dirtyValue) {
+          value = this.state.value - step;
+        }
+        else {
+          value = this.state.value + step
+        }
+        dirtyValue = value;
+      }
+      else {
+        if (snap < step/2) {
+          value = value - snap;
+        }
+        else {
+          value = value + (step - snap);
+        };
+      }
+    }
+
+    this._keyboardEvent = false;
+
+    // Clamp between min/max
+    value = Math.max(this.props.min, Math.min(this.props.max, value));
+
+    this.setState({value, dirtyValue});
+    this.props.onChange(value);
+  }
+
   render() {
-    return <input
-      className="maputnik-number"
-      placeholder={this.props.default}
-      value={this.state.value}
-      onChange={e => this.changeValue(e.target.value)}
-      onBlur={this.resetValue.bind(this)}
-    />
+    if(
+      this.props.hasOwnProperty("min") && this.props.hasOwnProperty("max") &&
+      this.props.min !== undefined && this.props.max !== undefined &&
+      this.props.allowRange
+    ) {
+      const value = this.state.editing ? this.state.dirtyValue : this.state.value;
+      const defaultValue = this.props.default === undefined ? "" : this.props.default;
+      let inputValue;
+      if (this.state.editingRange) {
+        inputValue = this.state.value;
+      }
+      else {
+        inputValue = value;
+      }
+
+      return <div className="maputnik-number-container">
+        <input
+          className="maputnik-number-range"
+          key="range"
+          type="range"
+          max={this.props.max}
+          min={this.props.min}
+          step="any"
+          spellCheck="false"
+          value={value === undefined ? defaultValue : value}
+          aria-hidden="true"
+          onChange={this.onChangeRange}
+          onKeyDown={() => {
+            this._keyboardEvent = true;
+          }}
+          onPointerDown={() => {
+            this.setState({editing: true, editingRange: true});
+          }}
+          onPointerUp={() => {
+            // Safari doesn't get onBlur event
+            this.setState({editing: false, editingRange: false});
+          }}
+          onBlur={() => {
+            this.setState({
+              editing: false,
+              editingRange: false,
+              dirtyValue: this.state.value,
+            });
+          }}
+        />
+        <input
+          key="text"
+          type="text"
+          spellCheck="false"
+          className="maputnik-number"
+          placeholder={this.props.default}
+          value={inputValue === undefined ? "" : inputValue}
+          onFocus={e => {
+            this.setState({editing: true});
+          }}
+          onChange={e => {
+            this.changeValue(e.target.value);
+          }}
+          onBlur={e => {
+            this.setState({editing: false});
+            this.resetValue()
+          }}
+        />
+      </div>
+    }
+    else {
+      const value = this.state.editing ? this.state.dirtyValue : this.state.value;
+
+      return <input
+        spellCheck="false"
+        className="maputnik-number"
+        placeholder={this.props.default}
+        value={value === undefined ? "" : value}
+        onChange={e => this.changeValue(e.target.value)}
+        onFocus={() => {
+          this.setState({editing: true});
+        }}
+        onBlur={this.resetValue}
+        required={this.props.required}
+      />
+    }
   }
 }
 

src/components/inputs/SelectInput.jsx

@@ -4,9 +4,11 @@ import PropTypes from 'prop-types'
 class SelectInput extends React.Component {
   static propTypes = {
     value: PropTypes.string.isRequired,
+    "data-wd-key": PropTypes.string,
     options: PropTypes.array.isRequired,
     style: PropTypes.object,
     onChange: PropTypes.func.isRequired,
+    title: PropTypes.string,
   }
 
 
@@ -18,7 +20,9 @@ class SelectInput extends React.Component {
 
     return <select
       className="maputnik-select"
+      data-wd-key={this.props["data-wd-key"]}
       style={this.props.style}
+      title={this.props.title}
       value={this.props.value}
       onChange={e => this.props.onChange(e.target.value)}
     >

src/components/inputs/SpecDoc.js

@@ -0,0 +1,83 @@
+import React from 'react'
+import PropTypes from 'prop-types'
+
+export default class SpecDoc extends React.Component {
+  static propTypes = {
+    fieldSpec: PropTypes.object.isRequired,
+  }
+
+  render () {
+    const {fieldSpec} = this.props;
+
+    const {doc, values} = fieldSpec;
+    const sdkSupport = fieldSpec['sdk-support'];
+
+    const headers = {
+      js: "JS",
+      android: "Android",
+      ios: "iOS",
+      macos: "macOS",
+    };
+
+    const renderValues = (
+      !!values &&
+      // HACK: Currently we merge additional values into the stylespec, so this is required
+      // See <https://github.com/maputnik/editor/blob/master/src/components/fields/PropertyGroup.jsx#L16>
+      !Array.isArray(values)
+    );
+
+    return (
+      <>
+        {doc && 
+          <div className="SpecDoc">
+            <div className="SpecDoc__doc">{doc}</div>
+            {renderValues &&
+              <ul className="SpecDoc__values">
+                {Object.entries(values).map(([key, value]) => {
+                  return (
+                    <li key={key}>
+                      <code>{JSON.stringify(key)}</code>
+                      <div>{value.doc}</div>
+                    </li>
+                  );
+                })}
+              </ul>
+            }
+          </div>
+        }
+        {sdkSupport &&
+          <div className="SpecDoc__sdk-support">
+            <table className="SpecDoc__sdk-support__table">
+              <thead>
+                <tr>
+                  <th></th>
+                  {Object.values(headers).map(header => {
+                    return <th key={header}>{header}</th>;
+                  })}
+                </tr>
+              </thead>
+              <tbody>
+                {Object.entries(sdkSupport).map(([key, supportObj]) => {
+                  return (
+                    <tr key={key}>
+                      <td>{key}</td>
+                      {Object.keys(headers).map(k => {
+                        const value = supportObj[k];
+                        if (supportObj.hasOwnProperty(k)) {
+                          return <td key={k}>{supportObj[k]}</td>;
+                        }
+                        else {
+                          return <td key={k}>no</td>;
+                        }
+                      })}
+                    </tr>
+                  );
+                })}
+              </tbody>
+            </table>
+          </div>
+        }
+      </>
+    );
+  }
+}

src/components/inputs/StringInput.jsx

@@ -3,22 +3,37 @@ import PropTypes from 'prop-types'
 
 class StringInput extends React.Component {
   static propTypes = {
+    "data-wd-key": PropTypes.string,
     value: PropTypes.string,
     style: PropTypes.object,
     default: PropTypes.string,
     onChange: PropTypes.func,
+    onInput: PropTypes.func,
     multi: PropTypes.bool,
+    required: PropTypes.bool,
+    disabled: PropTypes.bool,
+    spellCheck: PropTypes.bool,
+  }
+
+  static defaultProps = {
+    onInput: () => {},
   }
 
   constructor(props) {
     super(props)
     this.state = {
+      editing: false,
       value: props.value || ''
     }
   }
 
-  componentWillReceiveProps(nextProps) {
-    this.setState({ value: nextProps.value || '' })
+  static getDerivedStateFromProps(props, state) {
+    if (!state.editing) {
+      return {
+        value: props.value
+      };
+    }
+    return {};
   }
 
   render() {
@@ -39,15 +54,38 @@ class StringInput extends React.Component {
       ]
     }
 
+    if(!!this.props.disabled) {
+      classes.push("maputnik-string--disabled");
+    }
+
     return React.createElement(tag, {
+      "data-wd-key": this.props["data-wd-key"],
+      spellCheck: this.props.hasOwnProperty("spellCheck") ? this.props.spellCheck : !(tag === "input"),
+      disabled: this.props.disabled,
       className: classes.join(" "),
       style: this.props.style,
-      value: this.state.value,
+      value: this.state.value === undefined ? "" : this.state.value,
       placeholder: this.props.default,
-      onChange: e => this.setState({ value: e.target.value }),
+      onChange: e => {
+        this.setState({
+          editing: true,
+          value: e.target.value
+        }, () => {
+          this.props.onInput(this.state.value);
+        });
+      },
       onBlur: () => {
-        if(this.state.value!==this.props.value) this.props.onChange(this.state.value)
-      }
+        if(this.state.value!==this.props.value) {
+          this.setState({editing: false});
+          this.props.onChange(this.state.value);
+        }
+      },
+      onKeyDown: (e) => {
+        if (e.keyCode === 13) {
+          this.props.onChange(this.state.value);
+        }
+      },
+      required: this.props.required,
     });
   }
 }

src/components/inputs/UrlInput.jsx

@@ -0,0 +1,77 @@
+import React from 'react'
+import PropTypes from 'prop-types'
+import StringInput from './StringInput'
+import SmallError from '../util/SmallError'
+
+
+function validate (url) {
+  let error;
+  const getProtocol = (url) => {
+    try {
+      const urlObj = new URL(url);
+      return urlObj.protocol;
+    }
+    catch (err) {
+      return undefined;
+    }
+  };
+  const protocol = getProtocol(url);
+  if (
+    protocol &&
+    protocol === "http:" &&
+    window.location.protocol === "https:"
+  ) {
+    error = (
+      <SmallError>
+        CORS policy won&apos;t allow fetching resources served over http from https, use a <code>https://</code> domain
+      </SmallError>
+    );
+  }
+
+  return error;
+}
+
+class UrlInput extends React.Component {
+  static propTypes = {
+    "data-wd-key": PropTypes.string,
+    value: PropTypes.string,
+    style: PropTypes.object,
+    default: PropTypes.string,
+    onChange: PropTypes.func,
+    onInput: PropTypes.func,
+    multi: PropTypes.bool,
+    required: PropTypes.bool,
+  }
+
+  static defaultProps = {
+    onInput: () => {},
+  }
+
+  constructor (props) {
+    super(props);
+    this.state = {
+      error: validate(props.value)
+    };
+  }
+
+  onInput = (url) => {
+    this.setState({
+      error: validate(url)
+    });
+    this.props.onInput(url);
+  }
+
+  render () {
+    return (
+      <div>
+        <StringInput
+          {...this.props}
+          onInput={this.onInput}
+        />
+        {this.state.error}
+      </div>
+    );
+  }
+}
+
+export default UrlInput

src/components/layers/Collapse.jsx

@@ -0,0 +1,34 @@
+import React from 'react'
+import PropTypes from 'prop-types'
+import Collapse from 'react-collapse'
+import accessibility from '../../libs/accessibility'
+
+
+export default class CollapseAlt extends React.Component {
+  static propTypes = {
+    isActive: PropTypes.bool.isRequired,
+    children: PropTypes.element.isRequired
+  }
+
+  static defaultProps = {
+    isActive: true
+  }
+
+  render() {
+    if (accessibility.reducedMotionEnabled()) {
+      return (
+        <div style={{display: this.props.isActive ? "block" : "none"}}>
+          {this.props.children}
+        </div>
+      )
+    }
+    else {
+      return (
+        <Collapse isOpened={this.props.isActive}>
+          {this.props.children}
+        </Collapse>
+      )
+    }
+  }
+}
+

src/components/layers/Collapser.jsx

@@ -1,7 +1,6 @@
 import React from 'react'
 import PropTypes from 'prop-types'
-import CollapseOpenIcon from 'react-icons/lib/md/arrow-drop-down'
-import CollapseCloseIcon from 'react-icons/lib/md/arrow-drop-up'
+import {MdArrowDropDown, MdArrowDropUp} from 'react-icons/md'
 
 export default class Collapser extends React.Component {
   static propTypes = {
@@ -15,7 +14,7 @@ export default class Collapser extends React.Component {
       height: 20,
       ...this.props.style,
     }
-    return this.props.isCollapsed ? <CollapseCloseIcon style={iconStyle}/> : <CollapseOpenIcon style={iconStyle} />
+    return this.props.isCollapsed ? <MdArrowDropUp style={iconStyle}/> : <MdArrowDropDown style={iconStyle} />
   }
 }
 

src/components/layers/CommentBlock.jsx

@@ -11,7 +11,15 @@ class MetadataBlock extends React.Component {
   }
 
   render() {
-    return <InputBlock label={"Comments"} doc={"Comments for the current layer. This is non-standard and not in the spec."}>
+    const fieldSpec = {
+      doc: "Comments for the current layer. This is non-standard and not in the spec."
+    };
+
+    return <InputBlock
+      label={"Comments"}
+      fieldSpec={fieldSpec}
+      data-wd-key="layer-comment"
+    >
       <StringInput
         multi={true}
         value={this.props.value}

src/components/layers/JSONEditor.jsx

@@ -1,89 +1,159 @@
 import React from 'react'
 import PropTypes from 'prop-types'
+import classnames from 'classnames';
 
-import {Controlled as CodeMirror} from 'react-codemirror2'
 import InputBlock from '../inputs/InputBlock'
 import StringInput from '../inputs/StringInput'
-import SelectInput from '../inputs/SelectInput'
+import CodeMirror from 'codemirror';
 
 import 'codemirror/mode/javascript/javascript'
 import 'codemirror/addon/lint/lint'
+import 'codemirror/addon/edit/matchbrackets'
 import 'codemirror/lib/codemirror.css'
 import 'codemirror/addon/lint/lint.css'
-import '../../codemirror-maputnik.css'
 import jsonlint from 'jsonlint'
-
-// This is mainly because of this issue <https://github.com/zaach/jsonlint/issues/57> also the API has changed, see comment in file
-import '../../vendor/codemirror/addon/lint/json-lint'
+import stringifyPretty from 'json-stringify-pretty-compact'
+import '../util/codemirror-mgl';
 
 
 class JSONEditor extends React.Component {
   static propTypes = {
-    layer: PropTypes.object.isRequired,
+    layer: PropTypes.any.isRequired,
+    maxHeight: PropTypes.number,
     onChange: PropTypes.func,
+    lineNumbers: PropTypes.bool,
+    lineWrapping: PropTypes.bool,
+    getValue: PropTypes.func,
+    gutters: PropTypes.array,
+    className: PropTypes.string,
+    onFocus: PropTypes.func,
+    onBlur: PropTypes.func,
+    onJSONValid: PropTypes.func,
+    onJSONInvalid: PropTypes.func,
+    mode: PropTypes.object,
+    lint: PropTypes.oneOfType([
+      PropTypes.bool,
+      PropTypes.object,
+    ]),
+  }
+
+  static defaultProps = {
+    lineNumbers: true,
+    lineWrapping: false,
+    gutters: ["CodeMirror-lint-markers"],
+    getValue: (data) => {
+      return stringifyPretty(data, {indent: 2, maxLength: 40});
+    },
+    onFocus: () => {},
+    onBlur: () => {},
+    onJSONInvalid: () => {},
+    onJSONValid: () => {},
   }
 
   constructor(props) {
     super(props)
     this.state = {
-      code: JSON.stringify(props.layer, null, 2)
-    }
+      isEditing: false,
+      prevValue: this.props.getValue(this.props.layer),
+    };
   }
 
-  componentWillReceiveProps(nextProps) {
-    this.setState({
-      code: JSON.stringify(nextProps.layer, null, 2)
-    })
-  }
-
-  shouldComponentUpdate(nextProps, nextState) {
-    try {
-      const parsedLayer = JSON.parse(this.state.code)
-      // If the structure is still the same do not update
-      // because it affects editing experience by reformatting all the time
-      return nextState.code !== JSON.stringify(parsedLayer, null, 2)
-    } catch(err) {
-      return true
-    }
-  }
-
-  onCodeUpdate(newCode) {
-    try {
-      const parsedLayer = JSON.parse(newCode)
-      this.props.onChange(parsedLayer)
-    } catch(err) {
-      console.warn(err)
-    } finally {
-      this.setState({
-        code: newCode
-      })
-    }
-  }
-
-  resetValue() {
-    console.log('reset')
-    this.setState({
-      code: JSON.stringify(this.props.layer, null, 2)
-    })
-  }
-
-  render() {
-    const codeMirrorOptions = {
-      mode: {name: "javascript", json: true},
+  componentDidMount () {
+    this._doc = CodeMirror(this._el, {
+      value: this.props.getValue(this.props.layer),
+      mode: this.props.mode || {
+        name: "mgl",
+      },
+      lineWrapping: this.props.lineWrapping,
       tabSize: 2,
       theme: 'maputnik',
       viewportMargin: Infinity,
-      lineNumbers: true,
-      lint: true,
-      gutters: ["CodeMirror-lint-markers"],
+      lineNumbers: this.props.lineNumbers,
+      lint: this.props.lint || {
+        context: "layer"
+      },
+      matchBrackets: true,
+      gutters: this.props.gutters,
       scrollbarStyle: "null",
+    });
+
+    this._doc.on('change', this.onChange);
+    this._doc.on('focus', this.onFocus);
+    this._doc.on('blur', this.onBlur);
+  }
+
+  onFocus = () => {
+    this.props.onFocus();
+    this.setState({
+      isEditing: true
+    });
+  }
+
+  onBlur = () => {
+    this.props.onBlur();
+    this.setState({
+      isEditing: false
+    });
+  }
+
+  componentWillUnMount () {
+    this._doc.off('change', this.onChange);
+    this._doc.off('focus', this.onFocus);
+    this._doc.off('blur', this.onBlur);
+  }
+
+  componentDidUpdate(prevProps) {
+    if (!this.state.isEditing && prevProps.layer !== this.props.layer) {
+      this._cancelNextChange = true;
+      this._doc.setValue(
+        this.props.getValue(this.props.layer),
+      )
+    }
+  }
+
+  onChange = (e) => {
+    if (this._cancelNextChange) {
+      this._cancelNextChange = false;
+      this.setState({
+        prevValue: this._doc.getValue(),
+      })
+      return;
+    }
+    const newCode = this._doc.getValue();
+
+    if (this.state.prevValue !== newCode) {
+      let parsedLayer, err;
+      try {
+        parsedLayer = JSON.parse(newCode);
+      } catch(_err) {
+        err = _err;
+        console.warn(_err)
+      }
+
+      if (err) {
+        this.props.onJSONInvalid();
+      }
+      else {
+        this.props.onChange(parsedLayer)
+        this.props.onJSONValid();
+      }
     }
 
-    return <CodeMirror
-      value={this.state.code}
-      onBeforeChange={(editor, data, value) => this.onCodeUpdate(value)}
-      onFocusChange={focused => focused ? true : this.resetValue()}
-      options={codeMirrorOptions}
+    this.setState({
+      prevValue: newCode,
+    });
+  }
+
+  render() {
+    const style = {};
+    if (this.props.maxHeight) {
+      style.maxHeight = this.props.maxHeight;
+    }
+
+    return <div
+      className={classnames("codemirror-container", this.props.className)}
+      ref={(el) => this._el = el}
+      style={style}
     />
   }
 }

src/components/layers/LayerEditor.jsx

@@ -1,5 +1,6 @@
 import React from 'react'
 import PropTypes from 'prop-types'
+import { Wrapper, Button, Menu, MenuItem } from 'react-aria-menubutton'
 
 import JSONEditor from './JSONEditor'
 import FilterEditor from '../filter/FilterEditor'
@@ -12,17 +13,17 @@ import MaxZoomBlock from './MaxZoomBlock'
 import CommentBlock from './CommentBlock'
 import LayerSourceBlock from './LayerSourceBlock'
 import LayerSourceLayerBlock from './LayerSourceLayerBlock'
+import {Accordion} from 'react-accessible-accordion';
 
-import InputBlock from '../inputs/InputBlock'
-import MultiButtonInput from '../inputs/MultiButtonInput'
+import {MdMoreVert} from 'react-icons/md'
 
 import { changeType, changeProperty } from '../../libs/layer'
 import layout from '../../config/layout.json'
+import {formatLayerId} from '../util/format';
 
-class UnsupportedLayer extends React.Component {
-  render() {
-    return <div></div>
-  }
+
+function getLayoutForType (type) {
+  return layout[type] ? layout[type] : layout.invalid;
 }
 
 function layoutGroups(layerType) {
@@ -38,7 +39,9 @@ function layoutGroups(layerType) {
     title: 'JSON Editor',
     type: 'jsoneditor'
   }
-    return [layerGroup, filterGroup].concat(layout[layerType].groups).concat([editorGroup])
+  return [layerGroup, filterGroup]
+    .concat(getLayoutForType(layerType).groups)
+    .concat([editorGroup])
 }
 
 /** Layer editor supporting multiple types of layers. */
@@ -50,6 +53,14 @@ export default class LayerEditor extends React.Component {
     spec: PropTypes.object.isRequired,
     onLayerChanged: PropTypes.func,
     onLayerIdChange: PropTypes.func,
+    onMoveLayer: PropTypes.func,
+    onLayerDestroy: PropTypes.func,
+    onLayerCopy: PropTypes.func,
+    onLayerVisibilityToggle: PropTypes.func,
+    isFirstLayer: PropTypes.bool,
+    isLastLayer: PropTypes.bool,
+    layerIndex: PropTypes.number,
+    errors: PropTypes.array,
   }
 
   static defaultProps = {
@@ -74,18 +85,18 @@ export default class LayerEditor extends React.Component {
     this.state = { editorGroups }
   }
 
-  componentWillReceiveProps(nextProps) {
-    const additionalGroups = { ...this.state.editorGroups }
+  static getDerivedStateFromProps(props, state) {
+    const additionalGroups = { ...state.editorGroups }
 
-    layout[nextProps.layer.type].groups.forEach(group => {
+    getLayoutForType(props.layer.type).groups.forEach(group => {
       if(!(group.title in additionalGroups)) {
         additionalGroups[group.title] = true
       }
     })
 
-    this.setState({
+    return {
       editorGroups: additionalGroups
-    })
+    };
   }
 
   getChildContext () {
@@ -98,7 +109,10 @@ export default class LayerEditor extends React.Component {
   }
 
   changeProperty(group, property, newValue) {
-    this.props.onLayerChanged(changeProperty(this.props.layer, group, property, newValue))
+    this.props.onLayerChanged(
+      this.props.layerIndex,
+      changeProperty(this.props.layer, group, property, newValue)
+    )
   }
 
   onGroupToggle(groupTitle, active) {
@@ -116,38 +130,70 @@ export default class LayerEditor extends React.Component {
     if(this.props.layer.metadata) {
       comment = this.props.layer.metadata['maputnik:comment']
     }
+    const {errors, layerIndex} = this.props;
+
+    const errorData = {};
+    errors.forEach(error => {
+      if (
+        error.parsed &&
+        error.parsed.type === "layer" &&
+        error.parsed.data.index == layerIndex
+      ) {
+        errorData[error.parsed.data.key] = {
+          message: error.parsed.data.message
+        };
+      }
+    })
+
+    let sourceLayerIds;
+    if(this.props.sources.hasOwnProperty(this.props.layer.source)) {
+      sourceLayerIds = this.props.sources[this.props.layer.source].layers;
+    }
 
     switch(type) {
       case 'layer': return <div>
         <LayerIdBlock
           value={this.props.layer.id}
-          onChange={newId => this.props.onLayerIdChange(this.props.layer.id, newId)}
+          wdKey="layer-editor.layer-id"
+          error={errorData.id}
+          onChange={newId => this.props.onLayerIdChange(this.props.layerIndex, this.props.layer.id, newId)}
         />
         <LayerTypeBlock
+          disabled={true}
+          error={errorData.type}
           value={this.props.layer.type}
-          onChange={newType => this.props.onLayerChanged(changeType(this.props.layer, newType))}
+          onChange={newType => this.props.onLayerChanged(
+            this.props.layerIndex,
+            changeType(this.props.layer, newType)
+          )}
         />
         {this.props.layer.type !== 'background' && <LayerSourceBlock
+          error={errorData.sources}
           sourceIds={Object.keys(this.props.sources)}
           value={this.props.layer.source}
           onChange={v => this.changeProperty(null, 'source', v)}
         />
         }
-        {this.props.layer.type !== 'raster' && this.props.layer.type !== 'background' && <LayerSourceLayerBlock
-          sourceLayerIds={this.props.sources[this.props.layer.source].layers}
+        {['background', 'raster', 'hillshade', 'heatmap'].indexOf(this.props.layer.type) < 0 &&
+        <LayerSourceLayerBlock
+          error={errorData['source-layer']}
+          sourceLayerIds={sourceLayerIds}
           value={this.props.layer['source-layer']}
           onChange={v => this.changeProperty(null, 'source-layer', v)}
         />
         }
         <MinZoomBlock
+          error={errorData.minzoom}
           value={this.props.layer.minzoom}
           onChange={v => this.changeProperty(null, 'minzoom', v)}
         />
         <MaxZoomBlock
+          error={errorData.maxzoom}
           value={this.props.layer.maxzoom}
           onChange={v => this.changeProperty(null, 'maxzoom', v)}
         />
         <CommentBlock
+          error={errorData.comment}
           value={comment}
           onChange={v => this.changeProperty('metadata', 'maputnik:comment', v == ""  ? undefined : v)}
         />
@@ -155,6 +201,7 @@ export default class LayerEditor extends React.Component {
       case 'filter': return <div>
         <div className="maputnik-filter-editor-wrapper">
           <FilterEditor
+            errors={errorData}
             filter={this.props.layer.filter}
             properties={this.props.vectorLayers[this.props.layer['source-layer']]}
             onChange={f => this.changeProperty(null, 'filter', f)}
@@ -162,6 +209,7 @@ export default class LayerEditor extends React.Component {
         </div>
       </div>
       case 'properties': return <PropertyGroup
+        errors={errorData}
         layer={this.props.layer}
         groupFields={fields}
         spec={this.props.spec}
@@ -169,18 +217,34 @@ export default class LayerEditor extends React.Component {
       />
       case 'jsoneditor': return <JSONEditor
         layer={this.props.layer}
-        onChange={this.props.onLayerChanged}
+        onChange={(layer) => {
+          this.props.onLayerChanged(
+            this.props.layerIndex,
+            layer
+          );
+        }}
       />
-      default: return null
     }
   }
 
+  moveLayer(offset) {
+    this.props.onMoveLayer({
+      oldIndex: this.props.layerIndex,
+      newIndex: this.props.layerIndex+offset
+    })
+  }
+
   render() {
+    const groupIds = [];
     const layerType = this.props.layer.type
     const groups = layoutGroups(layerType).filter(group => {
       return !(layerType === 'background' && group.type === 'source')
     }).map(group => {
+      const groupId = group.title.replace(/ /g, "_");
+      groupIds.push(groupId);
       return <LayerEditorGroup
+        data-wd-key={group.title}
+        id={groupId}
         key={group.title}
         title={group.title}
         isActive={this.state.editorGroups[group.title]}
@@ -190,9 +254,80 @@ export default class LayerEditor extends React.Component {
       </LayerEditorGroup>
     })
 
+    const layout = this.props.layer.layout || {}
+
+    const items = {
+      delete: {
+        text: "Delete",
+        handler: () => this.props.onLayerDestroy(this.props.layerIndex)
+      },
+      duplicate: {
+        text: "Duplicate",
+        handler: () => this.props.onLayerCopy(this.props.layerIndex)
+      },
+      hide: {
+        text: (layout.visibility === "none") ? "Show" : "Hide",
+        handler: () => this.props.onLayerVisibilityToggle(this.props.layerIndex)
+      },
+      moveLayerUp: {
+        text: "Move layer up",
+        // Not actually used...
+        disabled: this.props.isFirstLayer,
+        handler: () => this.moveLayer(-1)
+      },
+      moveLayerDown: {
+        text: "Move layer down",
+        // Not actually used...
+        disabled: this.props.isLastLayer,
+        handler: () => this.moveLayer(+1)
+      }
+    }
+
+    function handleSelection(id, event) {
+      event.stopPropagation;
+      items[id].handler();
+    }
+
     return <div className="maputnik-layer-editor"
       >
-      {groups}
+      <header>
+        <div className="layer-header">
+          <h2 className="layer-header__title">
+            Layer: {formatLayerId(this.props.layer.id)}
+          </h2>
+          <div className="layer-header__info">
+            <Wrapper
+              className='more-menu'
+              onSelection={handleSelection}
+              closeOnSelection={false}
+            >
+              <Button className='more-menu__button'>
+                <MdMoreVert className="more-menu__button__svg" />
+              </Button>
+              <Menu>
+                <ul className="more-menu__menu">
+                  {Object.keys(items).map((id, idx) => {
+                    const item = items[id];
+                    return <li key={id}>
+                      <MenuItem value={id} className='more-menu__menu__item'>
+                        {item.text}
+                      </MenuItem>
+                    </li>
+                  })}
+                </ul>
+              </Menu>
+            </Wrapper>
+          </div>
+        </div>
+
+      </header>
+      <Accordion
+        allowMultipleExpanded={true}
+        allowZeroExpanded={true}
+        preExpanded={groupIds}
+      >
+        {groups}
+      </Accordion>
     </div>
   }
 }

src/components/layers/LayerEditorGroup.jsx

@@ -1,10 +1,22 @@
 import React from 'react'
 import PropTypes from 'prop-types'
-import Collapse from 'react-collapse'
-import Collapser from './Collapser'
+import Icon from '@mdi/react'
+import {
+  mdiMenuDown,
+  mdiMenuUp
+} from '@mdi/js';
+import {
+    AccordionItem,
+    AccordionItemHeading,
+    AccordionItemButton,
+    AccordionItemPanel,
+} from 'react-accessible-accordion';
+
 
 export default class LayerEditorGroup extends React.Component {
   static propTypes = {
+    "id": PropTypes.string,
+    "data-wd-key": PropTypes.string,
     title: PropTypes.string.isRequired,
     isActive: PropTypes.bool.isRequired,
     children: PropTypes.element.isRequired,
@@ -12,17 +24,28 @@ export default class LayerEditorGroup extends React.Component {
   }
 
   render() {
-    return <div>
-      <div className="maputnik-layer-editor-group"
+    return <AccordionItem uuid={this.props.id}>
+      <AccordionItemHeading className="maputnik-layer-editor-group"
+        data-wd-key={"layer-editor-group:"+this.props["data-wd-key"]}
         onClick={e => this.props.onActiveToggle(!this.props.isActive)}
       >
-        <span>{this.props.title}</span>
-        <span style={{flexGrow: 1}} />
-        <Collapser isCollapsed={this.props.isActive} />
-      </div>
-      <Collapse isOpened={this.props.isActive}>
+        <AccordionItemButton className="maputnik-layer-editor-group__button">
+          <span style={{flexGrow: 1}}>{this.props.title}</span>
+          <Icon
+            path={mdiMenuUp}
+            size={1}
+            className="maputnik-layer-editor-group__button__icon maputnik-layer-editor-group__button__icon--up"
+          />
+          <Icon
+            path={mdiMenuDown}
+            size={1}
+            className="maputnik-layer-editor-group__button__icon maputnik-layer-editor-group__button__icon--down"
+          />
+        </AccordionItemButton>
+      </AccordionItemHeading>
+      <AccordionItemPanel>
         {this.props.children}
-      </Collapse>
-    </div>
+      </AccordionItemPanel>
+    </AccordionItem>
   }
 }

src/components/layers/LayerIdBlock.jsx

@@ -1,18 +1,23 @@
 import React from 'react'
 import PropTypes from 'prop-types'
 
-import styleSpec from '@mapbox/mapbox-gl-style-spec/style-spec'
+import {latest} from '@mapbox/mapbox-gl-style-spec'
 import InputBlock from '../inputs/InputBlock'
 import StringInput from '../inputs/StringInput'
 
 class LayerIdBlock extends React.Component {
   static propTypes = {
     value: PropTypes.string.isRequired,
+    wdKey: PropTypes.string.isRequired,
     onChange: PropTypes.func.isRequired,
+    error: PropTypes.object,
   }
 
   render() {
-    return <InputBlock label={"ID"} doc={styleSpec.latest.layer.id.doc}>
+    return <InputBlock label={"ID"} fieldSpec={latest.layer.id}
+      data-wd-key={this.props.wdKey}
+      error={this.props.error}
+    >
       <StringInput
         value={this.props.value}
         onChange={this.props.onChange}

src/components/layers/LayerList.jsx

@@ -1,16 +1,13 @@
 import React from 'react'
 import PropTypes from 'prop-types'
 import classnames from 'classnames'
-import cloneDeep from 'lodash.clonedeep'
+import lodash from 'lodash';
 
-import Button from '../Button'
 import LayerListGroup from './LayerListGroup'
 import LayerListItem from './LayerListItem'
-import AddIcon from 'react-icons/lib/md/add-circle-outline'
 import AddModal from '../modals/AddModal'
 
-import style from '../../libs/style.js'
-import {SortableContainer, SortableHandle, arrayMove} from 'react-sortable-hoc';
+import {SortableContainer} from 'react-sortable-hoc';
 
 const layerListPropTypes = {
   layers: PropTypes.array.isRequired,
@@ -39,7 +36,6 @@ function findClosestCommonPrefix(layers, idx) {
 }
 
 // List of collapsible layer editors
-@SortableContainer
 class LayerListContainer extends React.Component {
   static propTypes = {...layerListPropTypes}
   static defaultProps = {
@@ -47,7 +43,9 @@ class LayerListContainer extends React.Component {
   }
 
   constructor(props) {
-    super(props)
+    super(props);
+    this.selectedItemRef = React.createRef();
+    this.scrollContainerRef = React.createRef();
     this.state = {
       collapsedGroups: {},
       areAllGroupsExpanded: false,
@@ -57,36 +55,6 @@ class LayerListContainer extends React.Component {
     }
   }
 
-  onLayerDestroy(layerId) {
-    const remainingLayers = this.props.layers.slice(0)
-    const idx = style.indexOfLayer(remainingLayers, layerId)
-    remainingLayers.splice(idx, 1);
-    this.props.onLayersChange(remainingLayers)
-  }
-
-  onLayerCopy(layerId) {
-    const changedLayers = this.props.layers.slice(0)
-    const idx = style.indexOfLayer(changedLayers, layerId)
-
-    const clonedLayer = cloneDeep(changedLayers[idx])
-    clonedLayer.id = clonedLayer.id + "-copy"
-    changedLayers.splice(idx, 0, clonedLayer)
-    this.props.onLayersChange(changedLayers)
-  }
-
-  onLayerVisibilityToggle(layerId) {
-    const changedLayers = this.props.layers.slice(0)
-    const idx = style.indexOfLayer(changedLayers, layerId)
-
-    const layer = { ...changedLayers[idx] }
-    const changedLayout = 'layout' in layer ? {...layer.layout} : {}
-    changedLayout.visibility = changedLayout.visibility === 'none' ? 'visible' : 'none'
-
-    layer.layout = changedLayout
-    changedLayers[idx] = layer
-    this.props.onLayersChange(changedLayers)
-  }
-
   toggleModal(modalName) {
     this.setState({
       isOpen: {
@@ -96,7 +64,7 @@ class LayerListContainer extends React.Component {
     })
   }
 
-  toggleLayers() {
+  toggleLayers = () => {
     let idx=0
 
     let newGroups=[]
@@ -104,12 +72,12 @@ class LayerListContainer extends React.Component {
     this.groupedLayers().forEach(layers => {
       const groupPrefix = layerPrefix(layers[0].id)
       const lookupKey = [groupPrefix, idx].join('-')
-      
+
 
       if (layers.length > 1) {
         newGroups[lookupKey] = this.state.areAllGroupsExpanded
       }
-      
+
       layers.forEach((layer) => {
         idx += 1
       })
@@ -154,15 +122,84 @@ class LayerListContainer extends React.Component {
     return collapsed === undefined ? true : collapsed
   }
 
+  shouldComponentUpdate (nextProps, nextState) {
+    // Always update on state change
+    if (this.state !== nextState) {
+      return true;
+    }
+
+    // This component tree only requires id and visibility from the layers
+    // objects
+    function getRequiredProps (layer) {
+      const out = {
+        id: layer.id,
+      };
+
+      if (layer.layout) {
+        out.layout = {
+          visibility: layer.layout.visibility
+        };
+      }
+      return out;
+    }
+    const layersEqual = lodash.isEqual(
+      nextProps.layers.map(getRequiredProps),
+      this.props.layers.map(getRequiredProps),
+    );
+
+    function withoutLayers (props) {
+      const out = {
+        ...props
+      };
+      delete out['layers'];
+      return out;
+    }
+
+    // Compare the props without layers because we've already compared them
+    // efficiently above.
+    const propsEqual = lodash.isEqual(
+      withoutLayers(this.props),
+      withoutLayers(nextProps)
+    );
+
+    const propsChanged = !(layersEqual && propsEqual);
+    return propsChanged;
+  }
+
+  componentDidUpdate (prevProps) {
+    if (prevProps.selectedLayerIndex !== this.props.selectedLayerIndex) {
+      const selectedItemNode = this.selectedItemRef.current;
+      if (selectedItemNode && selectedItemNode.node) {
+        const target = selectedItemNode.node;
+        const options = {
+          root: this.scrollContainerRef.current,
+          threshold: 1.0
+        }
+        const observer = new IntersectionObserver(entries => {
+          observer.unobserve(target);
+          if (entries.length > 0 && entries[0].intersectionRatio < 1) {
+            target.scrollIntoView();
+          }
+        }, options);
+
+        observer.observe(target);
+      }
+    }
+  }
+
   render() {
 
     const listItems = []
     let idx = 0
-    this.groupedLayers().forEach(layers => {
+    const layerIdCount = new Map();
+
+    const layersByGroup = this.groupedLayers();
+    layersByGroup.forEach(layers => {
       const groupPrefix = layerPrefix(layers[0].id)
       if(layers.length > 1) {
         const grp = <LayerListGroup
-          key={[groupPrefix, idx].join('-')}
+          data-wd-key={[groupPrefix, idx].join('-')}
+          key={`group-${groupPrefix}-${idx}`}
           title={groupPrefix}
           isActive={!this.isCollapsed(groupPrefix, idx) || idx === this.props.selectedLayerIndex}
           onActiveToggle={this.toggleLayerGroup.bind(this, groupPrefix, idx)}
@@ -173,28 +210,48 @@ class LayerListContainer extends React.Component {
       layers.forEach((layer, idxInGroup) => {
         const groupIdx = findClosestCommonPrefix(this.props.layers, idx)
 
+        const layerError = this.props.errors.find(error => {
+          return (
+            error.parsed &&
+            error.parsed.type === "layer" &&
+            error.parsed.data.index == idx
+          );
+        });
+
+        const additionalProps = {};
+        if (idx === this.props.selectedLayerIndex) {
+          additionalProps.ref = this.selectedItemRef;
+        }
+
+        layerIdCount.set(layer.id,
+          layerIdCount.has(layer.id) ? layerIdCount.get(layer.id) + 1 : 0
+        );
+        const key = `${layer.id}-${layerIdCount.get(layer.id)}`;
         const listItem = <LayerListItem
           className={classnames({
             'maputnik-layer-list-item-collapsed': layers.length > 1 && this.isCollapsed(groupPrefix, groupIdx) && idx !== this.props.selectedLayerIndex,
-            'maputnik-layer-list-item-group-last': idxInGroup == layers.length - 1 && layers.length > 1
+            'maputnik-layer-list-item-group-last': idxInGroup == layers.length - 1 && layers.length > 1,
+            'maputnik-layer-list-item--error': !!layerError
           })}
           index={idx}
-          key={layer.id}
+          key={key}
           layerId={layer.id}
+          layerIndex={idx}
           layerType={layer.type}
           visibility={(layer.layout || {}).visibility}
           isSelected={idx === this.props.selectedLayerIndex}
           onLayerSelect={this.props.onLayerSelect}
-          onLayerDestroy={this.onLayerDestroy.bind(this)}
-          onLayerCopy={this.onLayerCopy.bind(this)}
-          onLayerVisibilityToggle={this.onLayerVisibilityToggle.bind(this)}
+          onLayerDestroy={this.props.onLayerDestroy.bind(this)}
+          onLayerCopy={this.props.onLayerCopy.bind(this)}
+          onLayerVisibilityToggle={this.props.onLayerVisibilityToggle.bind(this)}
+          {...additionalProps}
         />
         listItems.push(listItem)
         idx += 1
       })
     })
 
-    return <div className="maputnik-layer-list">
+    return <div className="maputnik-layer-list" ref={this.scrollContainerRef}>
       <AddModal
           layers={this.props.layers}
           sources={this.props.sources}
@@ -207,20 +264,22 @@ class LayerListContainer extends React.Component {
         <span className="maputnik-space" />
         <div className="maputnik-default-property">
           <div className="maputnik-multibutton">
-            <a 
-              onClick={this.toggleLayers.bind(this)}
+            <button
+              id="skip-menu"
+              onClick={this.toggleLayers}
               className="maputnik-button">
               {this.state.areAllGroupsExpanded === true ? "Collapse" : "Expand"}
-            </a>
+            </button>
           </div>
         </div>
         <div className="maputnik-default-property">
           <div className="maputnik-multibutton">
-            <a
+            <button
               onClick={this.toggleModal.bind(this, 'add')}
+              data-wd-key="layer-list:add-layer"
               className="maputnik-button maputnik-button-selected">
              Add Layer
-            </a>
+            </button>
           </div>
         </div>
       </header>
@@ -231,21 +290,16 @@ class LayerListContainer extends React.Component {
   }
 }
 
+const LayerListContainerSortable = SortableContainer((props) => <LayerListContainer {...props} />)
+
 export default class LayerList extends React.Component {
   static propTypes = {...layerListPropTypes}
 
-  onSortEnd(move) {
-    const { oldIndex, newIndex } = move
-    if(oldIndex === newIndex) return
-    let layers = this.props.layers.slice(0)
-    layers = arrayMove(layers, oldIndex, newIndex)
-    this.props.onLayersChange(layers)
-  }
-
   render() {
-    return <LayerListContainer
+    return <LayerListContainerSortable
       {...this.props}
-      onSortEnd={this.onSortEnd.bind(this)}
+      helperClass='sortableHelper'
+      onSortEnd={this.props.onMoveLayer.bind(this)}
       useDragHandle={true}
     />
   }

src/components/layers/LayerListGroup.jsx

@@ -5,6 +5,7 @@ import Collapser from './Collapser'
 export default class LayerListGroup extends React.Component {
   static propTypes = {
     title: PropTypes.string.isRequired,
+    "data-wd-key": PropTypes.string,
     isActive: PropTypes.bool.isRequired,
     onActiveToggle: PropTypes.func.isRequired
   }
@@ -12,6 +13,7 @@ export default class LayerListGroup extends React.Component {
   render() {
     return <li className="maputnik-layer-list-group">
       <div className="maputnik-layer-list-group-header"
+        data-wd-key={"layer-list-group:"+this.props["data-wd-key"]}
         onClick={e => this.props.onActiveToggle(!this.props.isActive)}
       >
         <span className="maputnik-layer-list-group-title">{this.props.title}</span>

src/components/layers/LayerListItem.jsx

@@ -1,63 +1,68 @@
 import React from 'react'
 import PropTypes from 'prop-types'
-import Color from 'color'
 import classnames from 'classnames'
 
-import CopyIcon from 'react-icons/lib/md/content-copy'
-import VisibilityIcon from 'react-icons/lib/md/visibility'
-import VisibilityOffIcon from 'react-icons/lib/md/visibility-off'
-import DeleteIcon from 'react-icons/lib/md/delete'
+import {MdContentCopy, MdVisibility, MdVisibilityOff, MdDelete} from 'react-icons/md'
 
 import LayerIcon from '../icons/LayerIcon'
-import LayerEditor from './LayerEditor'
 import {SortableElement, SortableHandle} from 'react-sortable-hoc'
 
-@SortableHandle
-class LayerTypeDragHandle extends React.Component {
-  static propTypes = LayerIcon.propTypes
 
-  render() {
-    return <LayerIcon
-      {...this.props}
-      style={{
-        cursor: 'move',
-        width: 14,
-        height: 14,
-        paddingRight: 3,
-      }}
+const DraggableLabel = SortableHandle((props) => {
+  return <div className="maputnik-layer-list-item-handle">
+    <LayerIcon
+      className="layer-handle__icon"
+      type={props.layerType}
     />
-  }
-}
+    <span className="maputnik-layer-list-item-id">{props.layerId}</span>
+  </div>
+});
 
 class IconAction extends React.Component {
   static propTypes = {
     action: PropTypes.string.isRequired,
     onClick: PropTypes.func.isRequired,
+    wdKey: PropTypes.string,
+    classBlockName: PropTypes.string,
+    classBlockModifier: PropTypes.string,
   }
 
   renderIcon() {
     switch(this.props.action) {
-      case 'copy': return <CopyIcon />
-      case 'show': return <VisibilityIcon />
-      case 'hide': return <VisibilityOffIcon />
-      case 'delete': return <DeleteIcon />
-      default: return null
+      case 'duplicate': return <MdContentCopy />
+      case 'show': return <MdVisibility />
+      case 'hide': return <MdVisibilityOff />
+      case 'delete': return <MdDelete />
     }
   }
 
   render() {
-    return <a
-      className="maputnik-layer-list-icon-action"
+    const {classBlockName, classBlockModifier} = this.props;
+
+    let classAdditions = '';
+    if (classBlockName) {
+      classAdditions = `maputnik-layer-list-icon-action__${classBlockName}`;
+
+      if (classBlockModifier) {
+        classAdditions += ` maputnik-layer-list-icon-action__${classBlockName}--${classBlockModifier}`;
+      }
+    }
+
+    return <button
+      tabIndex="-1"
+      title={this.props.action}
+      className={`maputnik-layer-list-icon-action ${classAdditions}`}
+      data-wd-key={this.props.wdKey}
       onClick={this.props.onClick}
     >
       {this.renderIcon()}
-    </a>
+    </button>
   }
 }
 
-@SortableElement
 class LayerListItem extends React.Component {
   static propTypes = {
+    layerIndex: PropTypes.number.isRequired,
     layerId: PropTypes.string.isRequired,
     layerType: PropTypes.string.isRequired,
     isSelected: PropTypes.bool,
@@ -89,31 +94,42 @@ class LayerListItem extends React.Component {
   }
 
   render() {
+    const visibilityAction = this.props.visibility === 'visible' ? 'show' : 'hide';
+
     return <li
       key={this.props.layerId}
-      onClick={e => this.props.onLayerSelect(this.props.layerId)}
+      onClick={e => this.props.onLayerSelect(this.props.layerIndex)}
+      data-wd-key={"layer-list-item:"+this.props.layerId}
       className={classnames({
         "maputnik-layer-list-item": true,
         "maputnik-layer-list-item-selected": this.props.isSelected,
         [this.props.className]: true,
       })}>
-        <LayerTypeDragHandle type={this.props.layerType} />
-        <span className="maputnik-layer-list-item-id">{this.props.layerId}</span>
+        <DraggableLabel {...this.props} />
         <span style={{flexGrow: 1}} />
         <IconAction
+          wdKey={"layer-list-item:"+this.props.layerId+":delete"}
           action={'delete'}
-          onClick={e => this.props.onLayerDestroy(this.props.layerId)}
+          classBlockName="delete"
+          onClick={e => this.props.onLayerDestroy(this.props.layerIndex)}
         />
         <IconAction
-          action={'copy'}
-          onClick={e => this.props.onLayerCopy(this.props.layerId)}
+          wdKey={"layer-list-item:"+this.props.layerId+":copy"}
+          action={'duplicate'}
+          classBlockName="duplicate"
+          onClick={e => this.props.onLayerCopy(this.props.layerIndex)}
         />
         <IconAction
-          action={this.props.visibility === 'visible' ? 'hide' : 'show'}
-          onClick={e => this.props.onLayerVisibilityToggle(this.props.layerId)}
+          wdKey={"layer-list-item:"+this.props.layerId+":toggle-visibility"}
+          action={visibilityAction}
+          classBlockName="visibility"
+          classBlockModifier={visibilityAction}
+          onClick={e => this.props.onLayerVisibilityToggle(this.props.layerIndex)}
         />
     </li>
   }
 }
 
-export default LayerListItem;
+const LayerListItemSortable = SortableElement((props) => <LayerListItem {...props} />);
+
+export default LayerListItemSortable;

src/components/layers/LayerSourceBlock.jsx

@@ -1,15 +1,14 @@
 import React from 'react'
 import PropTypes from 'prop-types'
 
-import styleSpec from '@mapbox/mapbox-gl-style-spec/style-spec'
+import {latest} from '@mapbox/mapbox-gl-style-spec'
 import InputBlock from '../inputs/InputBlock'
-import StringInput from '../inputs/StringInput'
-import SelectInput from '../inputs/SelectInput'
 import AutocompleteInput from '../inputs/AutocompleteInput'
 
 class LayerSourceBlock extends React.Component {
   static propTypes = {
     value: PropTypes.string,
+    wdKey: PropTypes.string,
     onChange: PropTypes.func,
     sourceIds: PropTypes.array,
   }
@@ -20,7 +19,9 @@ class LayerSourceBlock extends React.Component {
   }
 
   render() {
-    return <InputBlock label={"Source"} doc={styleSpec.latest.layer.source.doc}>
+    return <InputBlock label={"Source"} fieldSpec={latest.layer.source}
+      data-wd-key={this.props.wdKey}
+    >
       <AutocompleteInput
         value={this.props.value}
         onChange={this.props.onChange}

src/components/layers/LayerSourceLayerBlock.jsx

@@ -1,10 +1,8 @@
 import React from 'react'
 import PropTypes from 'prop-types'
 
-import styleSpec from '@mapbox/mapbox-gl-style-spec/style-spec'
+import {latest} from '@mapbox/mapbox-gl-style-spec'
 import InputBlock from '../inputs/InputBlock'
-import StringInput from '../inputs/StringInput'
-import SelectInput from '../inputs/SelectInput'
 import AutocompleteInput from '../inputs/AutocompleteInput'
 
 class LayerSourceLayer extends React.Component {
@@ -22,7 +20,9 @@ class LayerSourceLayer extends React.Component {
   }
 
   render() {
-    return <InputBlock label={"Source Layer"} doc={styleSpec.latest.layer['source-layer'].doc}>
+    return <InputBlock label={"Source Layer"} fieldSpec={latest.layer['source-layer']}
+      data-wd-key="layer-source-layer"
+    >
       <AutocompleteInput
         keepMenuWithinWindowBounds={!!this.props.isFixed}
         value={this.props.value}

src/components/layers/LayerTypeBlock.jsx

@@ -1,31 +1,52 @@
 import React from 'react'
 import PropTypes from 'prop-types'
 
-import styleSpec from '@mapbox/mapbox-gl-style-spec/style-spec'
+import {latest} from '@mapbox/mapbox-gl-style-spec'
 import InputBlock from '../inputs/InputBlock'
 import SelectInput from '../inputs/SelectInput'
+import StringInput from '../inputs/StringInput'
 
 class LayerTypeBlock extends React.Component {
   static propTypes = {
     value: PropTypes.string.isRequired,
+    wdKey: PropTypes.string,
     onChange: PropTypes.func.isRequired,
+    error: PropTypes.object,
+    disabled: PropTypes.bool,
+  }
+
+  static defaultProps = {
+    disabled: false,
   }
 
   render() {
-    return <InputBlock label={"Type"} doc={styleSpec.latest.layer.type.doc}>
-      <SelectInput
-        options={[
-          ['background', 'Background'],
-          ['fill', 'Fill'],
-          ['line', 'Line'],
-          ['symbol', 'Symbol'],
-          ['raster', 'Raster'],
-          ['circle', 'Circle'],
-          ['fill-extrusion', 'Fill Extrusion'],
-        ]}
-        onChange={this.props.onChange}
-        value={this.props.value}
-      />
+    return <InputBlock label={"Type"} fieldSpec={latest.layer.type}
+      data-wd-key={this.props.wdKey}
+      error={this.props.error}
+    >
+      {this.props.disabled &&
+        <StringInput
+          value={this.props.value}
+          disabled={true}
+        />
+      }
+      {!this.props.disabled &&
+        <SelectInput
+          options={[
+            ['background', 'Background'],
+            ['fill', 'Fill'],
+            ['line', 'Line'],
+            ['symbol', 'Symbol'],
+            ['raster', 'Raster'],
+            ['circle', 'Circle'],
+            ['fill-extrusion', 'Fill Extrusion'],
+            ['hillshade', 'Hillshade'],
+            ['heatmap', 'Heatmap'],
+          ]}
+          onChange={this.props.onChange}
+          value={this.props.value}
+        />
+      }
     </InputBlock>
   }
 }

src/components/layers/MaxZoomBlock.jsx

@@ -1,7 +1,7 @@
 import React from 'react'
 import PropTypes from 'prop-types'
 
-import styleSpec from '@mapbox/mapbox-gl-style-spec/style-spec'
+import {latest} from '@mapbox/mapbox-gl-style-spec'
 import InputBlock from '../inputs/InputBlock'
 import NumberInput from '../inputs/NumberInput'
 
@@ -9,16 +9,21 @@ class MaxZoomBlock extends React.Component {
   static propTypes = {
     value: PropTypes.number,
     onChange: PropTypes.func.isRequired,
+    error: PropTypes.object,
   }
 
   render() {
-    return <InputBlock label={"Max Zoom"} doc={styleSpec.latest.layer.maxzoom.doc}>
+    return <InputBlock label={"Max Zoom"} fieldSpec={latest.layer.maxzoom}
+      error={this.props.error}
+      data-wd-key="max-zoom"
+    >
       <NumberInput
+        allowRange={true}
         value={this.props.value}
         onChange={this.props.onChange}
-        min={styleSpec.latest.layer.maxzoom.minimum}
-        max={styleSpec.latest.layer.maxzoom.maximum}
-        default={styleSpec.latest.layer.maxzoom.maximum}
+        min={latest.layer.maxzoom.minimum}
+        max={latest.layer.maxzoom.maximum}
+        default={latest.layer.maxzoom.maximum}
       />
     </InputBlock>
   }

src/components/layers/MinZoomBlock.jsx

@@ -1,7 +1,7 @@
 import React from 'react'
 import PropTypes from 'prop-types'
 
-import styleSpec from '@mapbox/mapbox-gl-style-spec/style-spec'
+import {latest} from '@mapbox/mapbox-gl-style-spec'
 import InputBlock from '../inputs/InputBlock'
 import NumberInput from '../inputs/NumberInput'
 
@@ -9,16 +9,21 @@ class MinZoomBlock extends React.Component {
   static propTypes = {
     value: PropTypes.number,
     onChange: PropTypes.func.isRequired,
+    error: PropTypes.object,
   }
 
   render() {
-    return <InputBlock label={"Min Zoom"} doc={styleSpec.latest.layer.minzoom.doc}>
+    return <InputBlock label={"Min Zoom"} fieldSpec={latest.layer.minzoom}
+      error={this.props.error}
+      data-wd-key="min-zoom"
+    >
       <NumberInput
+        allowRange={true}
         value={this.props.value}
         onChange={this.props.onChange}
-        min={styleSpec.latest.layer.minzoom.minimum}
-        max={styleSpec.latest.layer.minzoom.maximum}
-        default={styleSpec.latest.layer.minzoom.minimum}
+        min={latest.layer.minzoom.minimum}
+        max={latest.layer.minzoom.maximum}
+        default={latest.layer.minzoom.minimum}
       />
     </InputBlock>
   }

src/components/map/FeatureLayerPopup.jsx

@@ -1,8 +1,7 @@
 import React from 'react'
 import PropTypes from 'prop-types'
-import InputBlock from '../inputs/InputBlock'
-import StringInput from '../inputs/StringInput'
 import LayerIcon from '../icons/LayerIcon'
+import {latest, expression, function as styleFunction} from '@mapbox/mapbox-gl-style-spec'
 
 function groupFeaturesBySourceLayer(features) {
   const sources = {}
@@ -30,7 +29,49 @@ function groupFeaturesBySourceLayer(features) {
 class FeatureLayerPopup extends React.Component {
   static propTypes = {
     onLayerSelect: PropTypes.func.isRequired,
-    features: PropTypes.array
+    features: PropTypes.array,
+    zoom: PropTypes.number,
+  }
+
+  _getFeatureColor(feature, zoom) {
+    // Guard because openlayers won't have this
+    if (!feature.layer.paint) {
+      return;
+    }
+
+    try {
+      const paintProps = feature.layer.paint;
+      let propName;
+
+      if(paintProps.hasOwnProperty("text-color") && paintProps["text-color"]) {
+        propName = "text-color";
+      }
+      else if (paintProps.hasOwnProperty("fill-color") && paintProps["fill-color"]) {
+        propName = "fill-color";
+      }
+      else if (paintProps.hasOwnProperty("line-color") && paintProps["line-color"]) {
+        propName = "line-color";
+      }
+      else if (paintProps.hasOwnProperty("fill-extrusion-color") && paintProps["fill-extrusion-color"]) {
+        propName = "fill-extrusion-color";
+      }
+
+      if(propName) {
+        const propertySpec = latest["paint_"+feature.layer.type][propName];
+        let color = feature.layer.paint[propName];
+        return String(color);
+      }
+      else {
+        // Default color
+        return "black";
+      }
+    }
+    // This is quite complex, just incase there's an edgecase we're missing
+    // always return black if we get an unexpected error.
+    catch (err) {
+      console.warn("Unable to get feature color, error:", err);
+      return "black";
+    }
   }
 
   render() {
@@ -38,21 +79,33 @@ class FeatureLayerPopup extends React.Component {
 
     const items = Object.keys(sources).map(vectorLayerId => {
       const layers = sources[vectorLayerId].map((feature, idx) => {
-        return <label
-          key={idx}
-          className="maputnik-popup-layer"
-          onClick={() => {
-            this.props.onLayerSelect(feature.layer.id)
-          }}
+        const featureColor = this._getFeatureColor(feature, this.props.zoom);
+
+        return <div
+            key={idx}
+            className="maputnik-popup-layer"
         >
-          <LayerIcon type={feature.layer.type} style={{
-            width: 14,
-            height: 14,
-            paddingRight: 3
-          }}/>
-          {feature.layer.id}
-          {feature.counter && <span> × {feature.counter}</span>}
-        </label>
+          <div
+            className="maputnik-popup-layer__swatch" 
+            style={{background: featureColor}}
+          ></div>
+          <label
+            className="maputnik-popup-layer__label"
+            onClick={() => {
+              this.props.onLayerSelect(feature.layer.id)
+            }}
+          >
+            {feature.layer.type && 
+              <LayerIcon type={feature.layer.type} style={{
+                width: 14,
+                height: 14,
+                paddingRight: 3
+              }}/>
+            }
+            {feature.layer.id}
+            {feature.counter && <span> × {feature.counter}</span>}
+          </label>
+        </div>
       })
       return <div key={vectorLayerId}>
         <div className="maputnik-popup-layer-id">{vectorLayerId}</div>

src/components/map/FeaturePropertyPopup.jsx

@@ -21,8 +21,8 @@ function renderProperties(feature) {
   })
 }
 
-function renderFeature(feature) {
-  return <div key={feature.id}>
+function renderFeature(feature, idx) {
+  return <div key={`${feature.sourceLayer}-${idx}`}>
     <div className="maputnik-popup-layer-id">{feature.layer['source-layer']}{feature.inspectModeCounter && <span> × {feature.inspectModeCounter}</span>}</div>
     <InputBlock key={"property-type"} label={"$type"}>
       <StringInput value={feature.geometry.type} style={{backgroundColor: 'transparent'}} />
@@ -43,7 +43,7 @@ function removeDuplicatedFeatures(features) {
     if(featureIndex === -1) {
       uniqueFeatures.push(feature)
     } else {
-      if(uniqueFeatures[featureIndex].hasOwnProperty('counter')) {
+      if(uniqueFeatures[featureIndex].hasOwnProperty('inspectModeCounter')) {
         uniqueFeatures[featureIndex].inspectModeCounter++
       } else {
         uniqueFeatures[featureIndex].inspectModeCounter = 2

src/components/map/MapboxGlMap.jsx

@@ -5,7 +5,6 @@ import MapboxGl from 'mapbox-gl'
 import MapboxInspect from 'mapbox-gl-inspect'
 import FeatureLayerPopup from './FeatureLayerPopup'
 import FeaturePropertyPopup from './FeaturePropertyPopup'
-import style from '../../libs/style.js'
 import tokens from '../../config/tokens.json'
 import colors from 'mapbox-gl-inspect/lib/colors'
 import Color from 'color'
@@ -15,10 +14,12 @@ import 'mapbox-gl/dist/mapbox-gl.css'
 import '../../mapboxgl.css'
 import '../../libs/mapbox-rtl'
 
-function renderPropertyPopup(features) {
-  var mountNode = document.createElement('div');
-  ReactDOM.render(<FeaturePropertyPopup features={features} />, mountNode)
-  return mountNode.innerHTML;
+
+const IS_SUPPORTED = MapboxGl.supported();
+
+function renderPopup(popup, mountNode) {
+  ReactDOM.render(popup, mountNode);
+  return mountNode;
 }
 
 function buildInspectStyle(originalMapStyle, coloredLayers, highlightedLayer) {
@@ -38,7 +39,7 @@ function buildInspectStyle(originalMapStyle, coloredLayers, highlightedLayer) {
   const sources = {}
   Object.keys(originalMapStyle.sources).forEach(sourceId => {
     const source = originalMapStyle.sources[sourceId]
-    if(source.type !== 'raster') {
+    if(source.type !== 'raster' && source.type !== 'raster-dem') {
       sources[sourceId] = source
     }
   })
@@ -58,13 +59,18 @@ export default class MapboxGlMap extends React.Component {
     mapStyle: PropTypes.object.isRequired,
     inspectModeEnabled: PropTypes.bool.isRequired,
     highlightedLayer: PropTypes.object,
+    options: PropTypes.object,
+    replaceAccessTokens: PropTypes.func.isRequired,
+    onChange: PropTypes.func.isRequired,
   }
 
   static defaultProps = {
     onMapLoaded: () => {},
     onDataChange: () => {},
     onLayerSelect: () => {},
+    onChange: () => {},
     mapboxAccessToken: tokens.mapbox,
+    options: {},
   }
 
   constructor(props) {
@@ -73,46 +79,80 @@ export default class MapboxGlMap extends React.Component {
     this.state = {
       map: null,
       inspect: null,
-      isPopupOpen: false,
-      popupX: 0,
-      popupY: 0,
     }
   }
 
-  componentWillReceiveProps(nextProps) {
+  updateMapFromProps(props) {
+    if(!IS_SUPPORTED) return;
+
     if(!this.state.map) return
-    const metadata = nextProps.mapStyle.metadata || {}
+    const metadata = props.mapStyle.metadata || {}
     MapboxGl.accessToken = metadata['maputnik:mapbox_access_token'] || tokens.mapbox
 
-    if(!nextProps.inspectModeEnabled) {
-      //Mapbox GL now does diffing natively so we don't need to calculate
-      //the necessary operations ourselves!
-      this.state.map.setStyle(nextProps.mapStyle, { diff: true})
-    }
+    //Mapbox GL now does diffing natively so we don't need to calculate
+    //the necessary operations ourselves!
+    this.state.map.setStyle(
+      this.props.replaceAccessTokens(props.mapStyle),
+      {diff: true}
+    )
   }
 
   componentDidUpdate(prevProps) {
+    if(!IS_SUPPORTED) return;
+
+    const map = this.state.map;
+
+    this.updateMapFromProps(this.props);
+
     if(this.props.inspectModeEnabled !== prevProps.inspectModeEnabled) {
+      // HACK: Fix for <https://github.com/maputnik/editor/issues/576>, while we wait for a proper fix.
+      // eslint-disable-next-line
+      this.state.inspect._popupBlocked = false;
       this.state.inspect.toggleInspector()
     }
     if(this.props.inspectModeEnabled) {
       this.state.inspect.render()
     }
+
+    if (map) {
+      map.showTileBoundaries = this.props.options.showTileBoundaries;
+      map.showCollisionBoxes = this.props.options.showCollisionBoxes;
+      map.showOverdrawInspector = this.props.options.showOverdrawInspector;
+    }
   }
 
   componentDidMount() {
-    const map = new MapboxGl.Map({
+    if(!IS_SUPPORTED) return;
+
+    const mapOpts = {
+      ...this.props.options,
       container: this.container,
       style: this.props.mapStyle,
       hash: true,
-    })
+      maxZoom: 24
+    }
 
-    const zoom = new ZoomControl;
-    map.addControl(zoom, 'top-right');
+    const map = new MapboxGl.Map(mapOpts);
 
-    const nav = new MapboxGl.NavigationControl();
+    const mapViewChange = () => {
+      const center = map.getCenter();
+      const zoom = map.getZoom();
+      this.props.onChange({center, zoom});
+    }
+    mapViewChange();
+
+    map.showTileBoundaries = mapOpts.showTileBoundaries;
+    map.showCollisionBoxes = mapOpts.showCollisionBoxes;
+    map.showOverdrawInspector = mapOpts.showOverdrawInspector;
+
+    const zoomControl = new ZoomControl;
+    map.addControl(zoomControl, 'top-right');
+
+    const nav = new MapboxGl.NavigationControl({visualizePitch:true});
     map.addControl(nav, 'top-right');
 
+    const tmpNode = document.createElement('div');
+
     const inspect = new MapboxInspect({
       popup: new MapboxGl.Popup({
         closeOnClick: false
@@ -121,24 +161,30 @@ export default class MapboxGlMap extends React.Component {
       showMapPopupOnHover: false,
       showInspectMapPopupOnHover: true,
       showInspectButton: false,
+      blockHoverPopupOnClick: true,
       assignLayerColor: (layerId, alpha) => {
         return Color(colors.brightColor(layerId, alpha)).desaturate(0.5).string()
       },
       buildInspectStyle: (originalMapStyle, coloredLayers) => buildInspectStyle(originalMapStyle, coloredLayers, this.props.highlightedLayer),
       renderPopup: features => {
         if(this.props.inspectModeEnabled) {
-          return renderPropertyPopup(features)
+          return renderPopup(<FeaturePropertyPopup features={features} />, tmpNode);
         } else {
-          var mountNode = document.createElement('div');
-          ReactDOM.render(<FeatureLayerPopup features={features} onLayerSelect={this.props.onLayerSelect} />, mountNode)
-          return mountNode
+          return renderPopup(<FeatureLayerPopup features={features} onLayerSelect={this.onLayerSelectById} zoom={this.state.zoom} />, tmpNode);
         }
       }
     })
     map.addControl(inspect)
 
     map.on("style.load", () => {
-      this.setState({ map, inspect });
+      this.setState({
+        map,
+        inspect,
+        zoom: map.getZoom()
+      });
+      if(this.props.inspectModeEnabled) {
+        inspect.toggleInspector();
+      }
     })
 
     map.on("data", e => {
@@ -147,12 +193,41 @@ export default class MapboxGlMap extends React.Component {
         map: this.state.map
       })
     })
+
+    map.on("error", e => {
+      console.log("ERROR", e);
+    })
+
+    map.on("zoom", e => {
+      this.setState({
+        zoom: map.getZoom()
+      });
+    });
+
+    map.on("dragend", mapViewChange);
+    map.on("zoomend", mapViewChange);
+  }
+
+  onLayerSelectById = (id) => {
+    const index = this.props.mapStyle.layers.findIndex(layer => layer.id === id);
+    this.props.onLayerSelect(index);
   }
 
   render() {
-    return <div
-      className="maputnik-map"
-      ref={x => this.container = x}
-    ></div>
+    if(IS_SUPPORTED) {
+      return <div
+        className="maputnik-map__map"
+        ref={x => this.container = x}
+      ></div>
+    }
+    else {
+      return <div
+        className="maputnik-map maputnik-map--error"
+      >
+        <div className="maputnik-map__error-message">
+          Error: Cannot load MapboxGL, WebGL is either unsupported or disabled
+        </div>
+      </div>
+    }
   }
 }

src/components/map/OpenLayers3Map.jsx

@@ -1,172 +0,0 @@
-import React from 'react'
-import PropTypes from 'prop-types'
-import style from '../../libs/style.js'
-import isEqual from 'lodash.isequal'
-import { loadJSON } from '../../libs/urlopen'
-import 'openlayers/dist/ol.css'
-
-function suitableVectorSource(mapStyle) {
-  const sources = Object.keys(mapStyle.sources)
-    .map(sourceId => {
-      return {
-        id: sourceId,
-        source: mapStyle.sources[sourceId]
-      }
-    })
-    .filter(({source}) => (source.type === 'vector' || source.type === 'geojson'))
-  return sources[0]
-}
-
-function toVectorLayer(source, tilegrid, cb) {
-  function newMVTLayer(tileUrl) {
-    const ol = require('openlayers')
-    return new ol.layer.VectorTile({
-      source: new ol.source.VectorTile({
-        format: new ol.format.MVT(),
-        tileGrid: tilegrid,
-        tilePixelRatio: 8,
-        url: tileUrl
-      })
-    })
-  }
-
-  function newGeoJSONLayer(sourceUrl) {
-    const ol = require('openlayers')
-    return new ol.layer.Vector({
-      source: new ol.source.Vector({
-        format: new ol.format.GeoJSON(),
-        url: sourceUrl
-      })
-    })
-  }
-  if (source.type === 'vector') {
-    if(!source.tiles) {
-      sourceFromTileJSON(source.url, tileSource => {
-        cb(newMVTLayer(tileSource.tiles[0]))
-      })
-    } else {
-      cb(newMVTLayer(source.tiles[0]))
-    }
-  } else if (source.type === 'geojson') {
-    cb(newGeoJSONLayer(source.data))
-  }
-}
-
-function sourceFromTileJSON(url, cb) {
-  loadJSON(url, null, tilejson => {
-    if(!tilejson) return
-    cb({
-      type: 'vector',
-      tiles: tilejson.tiles,
-      minzoom: tilejson.minzoom,
-      maxzoom: tilejson.maxzoom,
-    })
-  })
-}
-
-class OpenLayers3Map extends React.Component {
-  static propTypes = {
-    onDataChange: PropTypes.func,
-    mapStyle: PropTypes.object.isRequired,
-    accessToken: PropTypes.string,
-    style: PropTypes.object,
-  }
-
-  static defaultProps = {
-    onMapLoaded: () => {},
-    onDataChange: () => {},
-  }
-
-  constructor(props) {
-    super(props)
-    this.tilegrid = null
-    this.resolutions = null
-    this.layer = null
-    this.map = null
-  }
-
-  updateStyle(newMapStyle) {
-    const oldSource = suitableVectorSource(this.props.mapStyle)
-    const newSource = suitableVectorSource(newMapStyle)
-    const resolutions = this.resolutions
-
-      function setStyleFunc(map, layer) {
-        const olms = require('ol-mapbox-style')
-        const styleFunc = olms.getStyleFunction(newMapStyle, newSource.id, resolutions)
-        layer.setStyle(styleFunc)
-        //NOTE: We need to mark the source as changed in order
-        //to trigger a rerender
-        layer.getSource().changed()
-        map.render()
-    }
-
-    if(newSource) {
-      if(this.layer && !isEqual(oldSource, newSource)) {
-        this.map.removeLayer(this.layer)
-        this.layer = null
-      }
-
-      if(!this.layer) {
-        var self = this
-        toVectorLayer(newSource.source, this.tilegrid, vectorLayer => {
-          self.layer = vectorLayer
-          self.map.addLayer(self.layer)
-          setStyleFunc(self.map, self.layer)
-        })
-      } else {
-        setStyleFunc(this.map, this.layer)
-      }
-    }
-  }
-
-  componentWillReceiveProps(nextProps) {
-    require.ensure(["openlayers", "ol-mapbox-style"], () => {
-      if(!this.map || !this.resolutions) return
-      this.updateStyle(nextProps.mapStyle)
-    })
-  }
-
-  componentDidMount() {
-    //Load OpenLayers dynamically once we need it
-    //TODO: Make this more convenient
-    require.ensure(["openlayers", "ol-mapbox-style"], ()=> {
-      console.log('Loaded OpenLayers3 renderer')
-
-      const ol = require('openlayers')
-      const olms = require('ol-mapbox-style')
-
-      this.tilegrid = ol.tilegrid.createXYZ({tileSize: 512, maxZoom: 22})
-      this.resolutions = this.tilegrid.getResolutions()
-
-      const map = new ol.Map({
-        target: this.container,
-        layers: [],
-        view: new ol.View({
-          zoom: 2,
-          center: [52.5, -78.4]
-        })
-      })
-      map.addControl(new ol.control.Zoom())
-      this.map = map
-      this.updateStyle(this.props.mapStyle)
-    })
-  }
-
-  render() {
-    return <div
-      ref={x => this.container = x}
-      style={{
-        position: "fixed",
-        top: 40,
-        right: 0,
-        bottom: 0,
-        height: 'calc(100% - 40px)',
-        width: "75%",
-        backgroundColor: '#fff',
-        ...this.props.style,
-      }}>
-    </div>
-  }
-}
-
-export default OpenLayers3Map

src/components/map/OpenLayersMap.jsx

@@ -0,0 +1,189 @@
+import React from 'react'
+import {throttle} from 'lodash';
+import PropTypes from 'prop-types'
+import { loadJSON } from '../../libs/urlopen'
+
+import FeatureLayerPopup from './FeatureLayerPopup';
+
+import 'ol/ol.css'
+import {apply} from 'ol-mapbox-style';
+import {Map, View, Proj, Overlay} from 'ol';
+
+import {toLonLat} from 'ol/proj';
+import {toStringHDMS} from 'ol/coordinate';
+
+
+function renderCoords (coords) {
+  if (!coords || coords.length < 2) {
+    return null;
+  }
+  else {
+    return <span className="maputnik-coords">
+      {coords.map((coord) => String(coord).padStart(7, "\u00A0")).join(', ')}
+    </span>
+  }
+}
+
+export default class OpenLayersMap extends React.Component {
+  static propTypes = {
+    onDataChange: PropTypes.func,
+    mapStyle: PropTypes.object.isRequired,
+    accessToken: PropTypes.string,
+    style: PropTypes.object,
+    onLayerSelect: PropTypes.func.isRequired,
+    debugToolbox: PropTypes.bool.isRequired,
+    replaceAccessTokens: PropTypes.func.isRequired,
+    onChange: PropTypes.func.isRequired,
+  }
+
+  static defaultProps = {
+    onMapLoaded: () => {},
+    onDataChange: () => {},
+    onLayerSelect: () => {},
+  }
+
+  constructor(props) {
+    super(props);
+    this.state = {
+      zoom: 0,
+      rotation: 0,
+      cursor: [],
+      center: [],
+    };
+    this.updateStyle = throttle(this._updateStyle.bind(this), 200);
+  }
+
+  _updateStyle(newMapStyle) {
+    if(!this.map) return;
+
+    // See <https://github.com/openlayers/ol-mapbox-style/issues/215#issuecomment-493198815>
+    this.map.getLayers().clear();
+    apply(this.map, newMapStyle);
+  }
+
+  componentDidUpdate(prevProps) {
+    if (this.props.mapStyle !== prevProps.mapStyle) {
+      this.updateStyle(
+        this.props.replaceAccessTokens(this.props.mapStyle)
+      );
+    }
+  }
+
+  componentDidMount() {
+    this.overlay = new Overlay({
+      element: this.popupContainer,
+      autoPan: true,
+      autoPanAnimation: {
+        duration: 250
+      }
+    });
+
+    const map = new Map({
+      target: this.container,
+      overlays: [this.overlay],
+      view: new View({
+        zoom: 1,
+        center: [180, -90],
+      })
+    });
+
+    map.on('pointermove', (evt) => {
+      var coords = toLonLat(evt.coordinate);
+      this.setState({
+        cursor: [
+          coords[0].toFixed(2),
+          coords[1].toFixed(2)
+        ]
+      })
+    })
+
+    const onMoveEnd = () => {
+      const zoom = map.getView().getZoom();
+      const center = toLonLat(map.getView().getCenter());
+
+      this.props.onChange({
+        zoom,
+        center: {
+          lng: center[0],
+          lat: center[1],
+        },
+      });
+    }
+
+    onMoveEnd();
+    map.on('moveend', onMoveEnd);
+
+    map.on('postrender', (evt) => {
+      const center = toLonLat(map.getView().getCenter());
+      this.setState({
+        center: [
+          center[0].toFixed(2),
+          center[1].toFixed(2),
+        ],
+        rotation: map.getView().getRotation().toFixed(2),
+        zoom: map.getView().getZoom().toFixed(2)
+      });
+    });
+
+
+
+    this.map = map;
+    this.updateStyle(
+      this.props.replaceAccessTokens(this.props.mapStyle)
+    );
+  }
+
+  closeOverlay = (e) => {
+    e.target.blur();
+    this.overlay.setPosition(undefined);
+  }
+
+  render() {
+    return <div className="maputnik-ol-container">
+      <div
+        ref={x => this.popupContainer = x}
+        style={{background: "black"}}
+        className="maputnik-popup"
+      >
+        <button
+          className="mapboxgl-popup-close-button"
+          onClick={this.closeOverlay}
+          aria-label="Close popup"
+        >
+          ×
+        </button>
+        <FeatureLayerPopup
+          features={this.state.selectedFeatures || []}
+          onLayerSelect={this.props.onLayerSelect}
+        />
+      </div>
+      <div className="maputnik-ol-zoom">
+        Zoom: {this.state.zoom}
+      </div>
+      {this.props.debugToolbox &&
+        <div className="maputnik-ol-debug">
+          <div>
+            <label>cursor: </label>
+            <span>{renderCoords(this.state.cursor)}</span>
+          </div>
+          <div>
+            <label>center: </label>
+            <span>{renderCoords(this.state.center)}</span>
+          </div>
+          <div>
+            <label>rotation: </label>
+            <span>{this.state.rotation}</span>
+          </div>
+        </div>
+      }
+      <div
+        className="maputnik-ol"
+        ref={x => this.container = x}
+        style={{
+          ...this.props.style,
+        }}>
+      </div>
+    </div>
+  }
+}
+

src/components/modals/AddModal.jsx

@@ -2,9 +2,6 @@ import React from 'react'
 import PropTypes from 'prop-types'
 
 import Button from '../Button'
-import InputBlock from '../inputs/InputBlock'
-import StringInput from '../inputs/StringInput'
-import SelectInput from '../inputs/SelectInput'
 import Modal from './Modal'
 
 import LayerTypeBlock from '../layers/LayerTypeBlock'
@@ -23,7 +20,7 @@ class AddModal extends React.Component {
     sources: PropTypes.object.isRequired,
   }
 
-  addLayer() {
+  addLayer = () => {
     const changedLayers = this.props.layers.slice(0)
     const layer = {
       id: this.state.id,
@@ -56,10 +53,10 @@ class AddModal extends React.Component {
     }
   }
 
-  componentWillUpdate(nextProps, nextState) {
+  componentDidUpdate(prevProps, prevState) {
     // Check if source is valid for new type
-    const oldType = this.state.type;
-    const newType = nextState.type;
+    const oldType = prevState.type;
+    const newType = this.state.type;
 
     const availableSourcesOld = this.getSources(oldType);
     const availableSourcesNew = this.getSources(newType);
@@ -67,11 +64,11 @@ class AddModal extends React.Component {
     if(
       // Type has changed
       oldType !== newType
-      && this.state.source !== ""
+      && prevState.source !== ""
       // Was a valid source previously
-      && availableSourcesOld.indexOf(this.state.source) > -1
+      && availableSourcesOld.indexOf(prevState.source) > -1
       // And is not a valid source now
-      && availableSourcesNew.indexOf(nextState.source) < 0
+      && availableSourcesNew.indexOf(this.state.source) < 0
     ) {
       // Clear the source
       this.setState({
@@ -94,15 +91,24 @@ class AddModal extends React.Component {
         "line",
         "symbol",
         "circle",
-        "fill-extrusion"
+        "fill-extrusion",
+        "heatmap"
       ],
       raster: [
         "raster"
+      ],
+      geojson: [
+        "fill",
+        "line",
+        "symbol",
+        "circle",
+        "fill-extrusion",
+        "heatmap"
       ]
     }
 
     for(let [key, val] of Object.entries(this.props.sources)) {
-      if(types[val.type].indexOf(type) > -1) {
+      if(types[val.type] && types[val.type].indexOf(type) > -1) {
         sources.push(key);
       }
     }
@@ -119,24 +125,31 @@ class AddModal extends React.Component {
       isOpen={this.props.isOpen}
       onOpenToggle={this.props.onOpenToggle}
       title={'Add Layer'}
+      data-wd-key="modal:add-layer"
+      className="maputnik-add-modal"
     >
       <div className="maputnik-add-layer">
       <LayerIdBlock
         value={this.state.id}
-        onChange={v => this.setState({ id: v })}
+        wdKey="add-layer.layer-id"
+        onChange={v => {
+          this.setState({ id: v })
+        }}
       />
       <LayerTypeBlock
         value={this.state.type}
+        wdKey="add-layer.layer-type"
         onChange={v => this.setState({ type: v })}
       />
       {this.state.type !== 'background' &&
       <LayerSourceBlock
         sourceIds={sources}
+        wdKey="add-layer.layer-source-block"
         value={this.state.source}
         onChange={v => this.setState({ source: v })}
       />
       }
-      {this.state.type !== 'background' && this.state.type !== 'raster' &&
+      {['background', 'raster', 'hillshade', 'heatmap'].indexOf(this.state.type) < 0 &&
       <LayerSourceLayerBlock
         isFixed={true}
         sourceLayerIds={layers}
@@ -144,7 +157,11 @@ class AddModal extends React.Component {
         onChange={v => this.setState({ 'source-layer': v })}
       />
       }
-      <Button className="maputnik-add-layer-button" onClick={this.addLayer.bind(this)}>
+      <Button
+        className="maputnik-add-layer-button"
+        onClick={this.addLayer}
+        data-wd-key="add-layer"
+      >
         Add Layer
       </Button>
       </div>

src/components/modals/DebugModal.js

@@ -0,0 +1,73 @@
+import React from 'react'
+import PropTypes from 'prop-types'
+
+import Modal from './Modal'
+
+
+class DebugModal extends React.Component {
+  static propTypes = {
+    isOpen: PropTypes.bool.isRequired,
+    renderer: PropTypes.string.isRequired,
+    onChangeMaboxGlDebug: PropTypes.func.isRequired,
+    onChangeOpenlayersDebug: PropTypes.func.isRequired,
+    onOpenToggle: PropTypes.func.isRequired,
+    mapboxGlDebugOptions: PropTypes.object,
+    openlayersDebugOptions: PropTypes.object,
+    mapView: PropTypes.object,
+  }
+
+  render() {
+    const {mapView} = this.props;
+
+    const osmZoom = Math.round(mapView.zoom)+1;
+    const osmLon = Number.parseFloat(mapView.center.lng).toFixed(5);
+    const osmLat = Number.parseFloat(mapView.center.lat).toFixed(5);
+
+    return <Modal
+      data-wd-key="debug-modal"
+      isOpen={this.props.isOpen}
+      onOpenToggle={this.props.onOpenToggle}
+      title={'Debug'}
+    >
+      <div className="maputnik-modal-section maputnik-modal-shortcuts">
+        <h4>Options</h4>
+        {this.props.renderer === 'mbgljs' &&
+          <ul>
+            {Object.entries(this.props.mapboxGlDebugOptions).map(([key, val]) => {
+              return <li key={key}>
+                <label>
+                  <input type="checkbox" checked={val} onClick={(e) => this.props.onChangeMaboxGlDebug(key, e.target.checked)} /> {key}
+                </label>
+              </li>
+            })}
+          </ul>
+        }
+        {this.props.renderer === 'ol' &&
+          <ul>
+            {Object.entries(this.props.openlayersDebugOptions).map(([key, val]) => {
+              return <li key={key}>
+                <label>
+                  <input type="checkbox" checked={val} onClick={(e) => this.props.onChangeOpenlayersDebug(key, e.target.checked)} /> {key}
+                </label>
+              </li>
+            })}
+          </ul>
+        }
+      </div>
+      <div className="maputnik-modal-section">
+        <h4>Links</h4>
+        <p>
+          <a
+            target="_blank"
+            rel="noopener noreferrer"
+            href={`https://www.openstreetmap.org/#map=${osmZoom}/${osmLat}/${osmLon}`}
+          >
+            Open in OSM
+          </a> &mdash; Opens the current view on openstreetmap.org
+        </p>
+      </div>
+    </Modal>
+  }
+}
+
+export default DebugModal;

src/components/modals/ExportModal.jsx

@@ -1,190 +1,19 @@
 import React from 'react'
 import PropTypes from 'prop-types'
+import Slugify from 'slugify'
 import { saveAs } from 'file-saver'
 
-import styleSpec from '@mapbox/mapbox-gl-style-spec/style-spec'
+import {format} from '@mapbox/mapbox-gl-style-spec'
 import InputBlock from '../inputs/InputBlock'
 import StringInput from '../inputs/StringInput'
-import SelectInput from '../inputs/SelectInput'
 import CheckboxInput from '../inputs/CheckboxInput'
 import Button from '../Button'
 import Modal from './Modal'
-import MdFileDownload from 'react-icons/lib/md/file-download'
-import TiClipboard from 'react-icons/lib/ti/clipboard'
-import style from '../../libs/style.js'
-import GitHub from 'github-api'
-import { CopyToClipboard } from 'react-copy-to-clipboard'
+import {MdFileDownload} from 'react-icons/md'
+import style from '../../libs/style'
+import fieldSpecAdditional from '../../libs/field-spec-additional'
 
 
-class Gist extends React.Component {
-  static propTypes = {
-    mapStyle: PropTypes.object.isRequired,
-    onStyleChanged: PropTypes.func.isRequired,
-  }
-
-  constructor(props) {
-    super(props);
-    this.state = {
-      preview: false,
-      saving: false,
-      latestGist: null,
-    }
-  }
-
-  componentWillReceiveProps(nextProps) {
-    this.setState({
-      ...this.state,
-      preview: !!(nextProps.mapStyle.metadata || {})['maputnik:openmaptiles_access_token']
-    })
-  }
-
-  onSave() {
-    this.setState({
-      ...this.state,
-      saving: true
-    });
-    const preview = this.state.preview && (this.props.mapStyle.metadata || {})['maputnik:openmaptiles_access_token'];
-
-    const mapStyleStr = preview ?
-        styleSpec.format(stripAccessTokens(style.replaceAccessToken(this.props.mapStyle))) :
-        styleSpec.format(stripAccessTokens(this.props.mapStyle));
-    const styleTitle = this.props.mapStyle.name || 'Style';
-    const htmlStr = `
-  <!DOCTYPE html>
-  <html>
-  <head>
-    <meta charset="UTF-8">
-    <meta name="viewport" content="width=device-width, initial-scale=1">
-    <title>`+styleTitle+` Preview</title>
-    <link rel="stylesheet" type="text/css" href="https://api.mapbox.com/mapbox-gl-js/v0.43.0/mapbox-gl.css" />
-    <script src="https://api.mapbox.com/mapbox-gl-js/v0.43.0/mapbox-gl.js"></script>
-    <style>
-      body { margin:0; padding:0; }
-      #map { position:absolute; top:0; bottom:0; width:100%; }
-    </style>
-  </head>
-  <body>
-    <div id='map'></div>
-    <script>
-        var map = new mapboxgl.Map({
-          container: 'map',
-          style: 'style.json',
-          attributionControl: true,
-          hash: true
-        });
-        map.addControl(new mapboxgl.NavigationControl());
-    </script>
-  </body>
-  </html>
-`
-    const files = {
-      "style.json": {
-        content: mapStyleStr
-      }
-    }
-    if(preview) {
-      files["index.html"] = {
-        content: htmlStr
-      }
-    }
-    const gh = new GitHub();
-    let gist = gh.getGist(); // not a gist yet
-    gist.create({
-      public: true,
-      description: styleTitle,
-      files: files
-    }).then(function({data}) {
-      return gist.read();
-    }).then(function({data}) {
-      this.setState({
-        ...this.state,
-        latestGist: data,
-        saving: false,
-      });
-    }.bind(this));
-  }
-
-  onPreviewChange(value) {
-    this.setState({
-      ...this.state,
-      preview: value
-    })
-  }
-
-  changeMetadataProperty(property, value) {
-    const changedStyle = {
-      ...this.props.mapStyle,
-      metadata: {
-        ...this.props.mapStyle.metadata,
-        [property]: value
-      }
-    }
-    this.props.onStyleChanged(changedStyle)
-  }
-
-  renderPreviewLink() {
-    const gist = this.state.latestGist;
-    const user = gist.user || 'anonymous';
-    const preview = !!gist.files['index.html'];
-    if(preview) {
-      return <span><a target="_blank" rel="noopener noreferrer" href={"https://bl.ocks.org/"+user+"/"+gist.id}>Preview</a>,{' '}</span>
-    }
-    return null;
-  }
-
-  renderLatestGist() {
-    const gist = this.state.latestGist;
-    const saving = this.state.saving;
-    if(saving) {
-      return <p>Saving...</p>
-    } else if(gist) {
-      const user = gist.user || 'anonymous';
-      const rawGistLink = "https://gist.githubusercontent.com/" + user + "/" + gist.id + "/raw/" + gist.history[0].version + "/style.json"
-      const maputnikStyleLink = "https://maputnik.github.io/editor/?style=" + rawGistLink
-      return <div className="maputnik-render-gist">
-        <p>
-          Latest saved gist:{' '}
-          {this.renderPreviewLink(this)}
-          <a target="_blank" rel="noopener noreferrer" href={"https://gist.github.com/" + user + "/" + gist.id}>Source</a>
-        </p>
-        <p>
-          <CopyToClipboard text={maputnikStyleLink}>
-            <span>Share this style: <Button><TiClipboard size={18} /></Button></span>
-          </CopyToClipboard>
-          <StringInput value={maputnikStyleLink} />
-        </p>
-      </div>
-    }
-  }
-
-  render() {
-    return <div className="maputnik-export-gist">
-      <Button onClick={this.onSave.bind(this)}>
-        <MdFileDownload />
-        Save to Gist (anonymous)
-      </Button>
-      {' '}
-      <CheckboxInput
-        value={this.state.preview}
-        name='gist-style-preview'
-        onChange={this.onPreviewChange.bind(this)}
-      />
-      <span> Include preview</span>
-      {this.state.preview ?
-          <div>
-            <InputBlock
-                label={"OpenMapTiles Access Token: "}>
-              <StringInput
-                  value={(this.props.mapStyle.metadata || {})['maputnik:openmaptiles_access_token']}
-                  onChange={this.changeMetadataProperty.bind(this, "maputnik:openmaptiles_access_token")}/>
-            </InputBlock>
-            <a target="_blank" rel="noopener noreferrer" href="https://openmaptiles.com/hosting/">Get your free access token</a>
-          </div>
-      : null}
-      {this.renderLatestGist()}
-    </div>
-  }
-}
 
 function stripAccessTokens(mapStyle) {
   const changedMetadata = { ...mapStyle.metadata }
@@ -209,15 +38,40 @@ class ExportModal extends React.Component {
   }
 
   downloadStyle() {
-    const blob = new Blob([styleSpec.format(stripAccessTokens(this.props.mapStyle))], {type: "application/json;charset=utf-8"});
-    saveAs(blob, this.props.mapStyle.id + ".json");
+    const tokenStyle = format(stripAccessTokens(style.replaceAccessTokens(this.props.mapStyle)));
+
+    const blob = new Blob([tokenStyle], {type: "application/json;charset=utf-8"});
+    let exportName;
+    if(this.props.mapStyle.name) {
+      exportName = Slugify(this.props.mapStyle.name, {
+                     replacement: '_',
+                     lower: true
+                   })
+    } else {
+      exportName = this.props.mapStyle.id
+    }
+    saveAs(blob, exportName + ".json");
   }
 
+  changeMetadataProperty(property, value) {
+    const changedStyle = {
+      ...this.props.mapStyle,
+      metadata: {
+        ...this.props.mapStyle.metadata,
+        [property]: value
+      }
+    }
+    this.props.onStyleChanged(changedStyle)
+  }
+
+
   render() {
     return <Modal
+      data-wd-key="export-modal"
       isOpen={this.props.isOpen}
       onOpenToggle={this.props.onOpenToggle}
       title={'Export Style'}
+      className="maputnik-export-modal"
     >
 
       <div className="maputnik-modal-section">
@@ -225,16 +79,43 @@ class ExportModal extends React.Component {
         <p>
           Download a JSON style to your computer.
         </p>
+
+        <div>
+          <InputBlock
+            label={fieldSpecAdditional.maputnik.mapbox_access_token.label}
+            fieldSpec={fieldSpecAdditional.maputnik.mapbox_access_token}
+          >
+            <StringInput
+              value={(this.props.mapStyle.metadata || {})['maputnik:openmaptiles_access_token']}
+              onChange={this.changeMetadataProperty.bind(this, "maputnik:openmaptiles_access_token")}
+            />
+          </InputBlock>
+          <InputBlock
+            label={fieldSpecAdditional.maputnik.maptiler_access_token.label}
+            fieldSpec={fieldSpecAdditional.maputnik.maptiler_access_token}
+          >
+            <StringInput
+              value={(this.props.mapStyle.metadata || {})['maputnik:mapbox_access_token']}
+              onChange={this.changeMetadataProperty.bind(this, "maputnik:mapbox_access_token")}
+            />
+          </InputBlock>
+          <InputBlock
+            label={fieldSpecAdditional.maputnik.thunderforest_access_token.label}
+            fieldSpec={fieldSpecAdditional.maputnik.thunderforest_access_token}
+          >
+            <StringInput
+              value={(this.props.mapStyle.metadata || {})['maputnik:thunderforest_access_token']}
+              onChange={this.changeMetadataProperty.bind(this, "maputnik:thunderforest_access_token")}
+            />
+          </InputBlock>
+        </div>
+
         <Button onClick={this.downloadStyle.bind(this)}>
           <MdFileDownload />
           Download
         </Button>
       </div>
 
-      <div className="maputnik-modal-section">
-        <h4>Save style</h4>
-        <Gist mapStyle={this.props.mapStyle} onStyleChanged={this.props.onStyleChanged}/>
-      </div>
     </Modal>
   }
 }

src/components/modals/LoadingModal.jsx

@@ -0,0 +1,45 @@
+import React from 'react'
+import PropTypes from 'prop-types'
+
+import Button from '../Button'
+import Modal from './Modal'
+
+
+class LoadingModal extends React.Component {
+  static propTypes = {
+    isOpen: PropTypes.bool.isRequired,
+    onCancel: PropTypes.func.isRequired,
+    title: PropTypes.string.isRequired,
+    message: PropTypes.node.isRequired,
+  }
+
+  underlayOnClick(e) {
+    // This stops click events falling through to underlying modals.
+    e.stopPropagation();
+  }
+
+  render() {
+    return <Modal
+      data-wd-key="loading-modal"
+      isOpen={this.props.isOpen}
+      underlayClickExits={false}
+      underlayProps={{
+        onClick: (e) => underlayProps(e)
+      }}
+      closeable={false}
+      title={this.props.title}
+      onOpenToggle={() => this.props.onCancel()}
+    >
+      <p>
+        {this.props.message}
+      </p>
+      <p className="maputnik-dialog__buttons">
+        <Button onClick={(e) => this.props.onCancel(e)}>
+          Cancel
+        </Button>
+      </p>
+    </Modal>
+  }
+}
+
+export default LoadingModal

src/components/modals/Modal.jsx

@@ -1,33 +1,74 @@
 import React from 'react'
 import PropTypes from 'prop-types'
-import CloseIcon from 'react-icons/lib/md/close'
-import Overlay from './Overlay'
+import {MdClose} from 'react-icons/md'
+import AriaModal from 'react-aria-modal'
+import classnames from 'classnames';
+
 
 class Modal extends React.Component {
   static propTypes = {
+    "data-wd-key": PropTypes.string,
     isOpen: PropTypes.bool.isRequired,
     title: PropTypes.string.isRequired,
     onOpenToggle: PropTypes.func.isRequired,
     children: PropTypes.node,
+    underlayClickExits: PropTypes.bool,
+    underlayProps: PropTypes.object,
+    className: PropTypes.string,
+  }
+
+  static defaultProps = {
+    underlayClickExits: true
+  }
+
+  // See <https://github.com/maputnik/editor/issues/416>
+  onClose = () => {
+    if (document.activeElement) {
+      document.activeElement.blur();
+    }
+
+    setImmediate(() => {
+      this.props.onOpenToggle(false);
+    });
+  }
+
+  getApplicationNode() {
+    return document.getElementById('app');
   }
 
   render() {
-    return <Overlay isOpen={this.props.isOpen}>
-      <div className="maputnik-modal">
-        <header className="maputnik-modal-header">
-          <h1 className="maputnik-modal-header-title">{this.props.title}</h1>
-          <span className="maputnik-modal-header-space"></span>
-          <a className="maputnik-modal-header-toggle"
-            onClick={() => this.props.onOpenToggle(false)}
-          >
-            <CloseIcon />
-          </a>
-        </header>
-        <div className="maputnik-modal-scroller">
-          <div className="maputnik-modal-content">{this.props.children}</div>
+    if(this.props.isOpen) {
+      return <AriaModal
+        titleText={this.props.title}
+        underlayClickExits={this.props.underlayClickExits}
+        underlayProps={this.props.underlayProps}
+        getApplicationNode={this.getApplicationNode}
+        data-wd-key={this.props["data-wd-key"]}
+        verticallyCenter={true}
+        onExit={this.onClose}
+      >
+        <div className={classnames("maputnik-modal", this.props.className)}
+          data-wd-key={this.props["data-wd-key"]}
+        >
+          <header className="maputnik-modal-header">
+            <h1 className="maputnik-modal-header-title">{this.props.title}</h1>
+            <span className="maputnik-modal-header-space"></span>
+            <button className="maputnik-modal-header-toggle"
+              onClick={this.onClose}
+              data-wd-key={this.props["data-wd-key"]+".close-modal"}
+            >
+              <MdClose />
+            </button>
+          </header>
+          <div className="maputnik-modal-scroller">
+            <div className="maputnik-modal-content">{this.props.children}</div>
+          </div>
         </div>
-      </div>
-    </Overlay>
+      </AriaModal>
+    }
+    else {
+      return false;
+    }
   }
 }
 

src/components/modals/OpenModal.jsx

@@ -1,12 +1,13 @@
 import React from 'react'
 import PropTypes from 'prop-types'
+import LoadingModal from './LoadingModal'
 import Modal from './Modal'
 import Button from '../Button'
 import FileReaderInput from 'react-file-reader-input'
-import request from 'request'
+import UrlInput from '../inputs/UrlInput'
 
-import FileUploadIcon from 'react-icons/lib/md/file-upload'
-import AddIcon from 'react-icons/lib/md/add-circle-outline'
+import {MdFileUpload} from 'react-icons/md'
+import {MdAddCircleOutline} from 'react-icons/md'
 
 import style from '../../libs/style.js'
 import publicStyles from '../../config/styles.json'
@@ -23,18 +24,20 @@ class PublicStyle extends React.Component {
     return <div className="maputnik-public-style">
       <Button
         className="maputnik-public-style-button"
+        aria-label={this.props.title}
         onClick={() => this.props.onSelect(this.props.url)}
       >
         <header className="maputnik-public-style-header">
           <h4>{this.props.title}</h4>
           <span className="maputnik-space" />
-          <AddIcon />
+          <MdAddCircleOutline />
         </header>
-        <img
+        <div
           className="maputnik-public-style-thumbnail"
-          src={this.props.thumbnailUrl}
-          alt={this.props.title}
-        />
+          style={{
+            backgroundImage: `url(${this.props.thumbnailUrl})`
+          }}
+        ></div>
       </Button>
     </div>
   }
@@ -49,7 +52,9 @@ class OpenModal extends React.Component {
 
   constructor(props) {
     super(props);
-    this.state = {};
+    this.state = {
+      styleUrl: ""
+    };
   }
 
   clearError() {
@@ -58,30 +63,71 @@ class OpenModal extends React.Component {
     })
   }
 
-  onStyleSelect(styleUrl) {
+  onCancelActiveRequest(e) {
+    // Else the click propagates to the underlying modal
+    if(e) e.stopPropagation();
+
+    if(this.state.activeRequest) {
+      this.state.activeRequest.abort();
+      this.setState({
+        activeRequest: null,
+        activeRequestUrl: null
+      });
+    }
+  }
+
+  onStyleSelect = (styleUrl) => {
     this.clearError();
 
-    request({
-      url: styleUrl,
-      withCredentials: false,
-    }, (error, response, body) => {
-        if (!error && response.statusCode == 200) {
-          const mapStyle = style.ensureStyleValidity(JSON.parse(body))
-          console.log('Loaded style ', mapStyle.id)
-          this.props.onStyleOpen(mapStyle)
-          this.onOpenToggle()
-        } else {
-          console.warn('Could not open the style URL', styleUrl)
+    let canceled;
+
+    const activeRequest = fetch(styleUrl, {
+      mode: 'cors',
+      credentials: "same-origin"
+    })
+    .then(function(response) {
+      return response.json();
+    })
+    .then((body) => {
+      if(canceled) {
+        return;
+      }
+
+      this.setState({
+        activeRequest: null,
+        activeRequestUrl: null
+      });
+
+      const mapStyle = style.ensureStyleValidity(body)
+      console.log('Loaded style ', mapStyle.id)
+      this.props.onStyleOpen(mapStyle)
+      this.onOpenToggle()
+    })
+    .catch((err) => {
+      this.setState({
+        error: `Failed to load: '${styleUrl}'`,
+        activeRequest: null,
+        activeRequestUrl: null
+      });
+      console.error(err);
+      console.warn('Could not open the style URL', styleUrl)
+    })
+
+    this.setState({
+      activeRequest: {
+        abort: function() {
+          canceled = true;
         }
+      },
+      activeRequestUrl: styleUrl
     })
   }
 
-  onOpenUrl() {
-    const url = this.styleUrlElement.value;
-    this.onStyleSelect(url);
+  onOpenUrl = (url) => {
+    this.onStyleSelect(this.state.styleUrl);
   }
 
-  onUpload(_, files) {
+  onUpload = (_, files) => {
     const [e, file] = files[0];
     const reader = new FileReader();
 
@@ -107,10 +153,19 @@ class OpenModal extends React.Component {
   }
 
   onOpenToggle() {
+    this.setState({
+      styleUrl: ""
+    });
     this.clearError();
     this.props.onOpenToggle();
   }
 
+  onChangeUrl = (url) => {
+    this.setState({
+      styleUrl: url,
+    });
+  }
+
   render() {
     const styleOptions = publicStyles.map(style => {
       return <PublicStyle
@@ -118,7 +173,7 @@ class OpenModal extends React.Component {
         url={style.url}
         title={style.title}
         thumbnailUrl={style.thumbnail}
-        onSelect={this.onStyleSelect.bind(this)}
+        onSelect={this.onStyleSelect}
       />
     })
 
@@ -132,41 +187,65 @@ class OpenModal extends React.Component {
       );
     }
 
-    return <Modal
-      isOpen={this.props.isOpen}
-      onOpenToggle={() => this.onOpenToggle()}
-      title={'Open Style'}
-    >
-      {errorElement}
-      <section className="maputnik-modal-section">
-        <h2>Upload Style</h2>
-        <p>Upload a JSON style from your computer.</p>
-        <FileReaderInput onChange={this.onUpload.bind(this)}>
-          <Button className="maputnik-upload-button"><FileUploadIcon /> Upload</Button>
-        </FileReaderInput>
-      </section>
+    return  (
+      <div>
+        <Modal
+          data-wd-key="open-modal"
+          isOpen={this.props.isOpen}
+          onOpenToggle={() => this.onOpenToggle()}
+          title={'Open Style'}
+        >
+          {errorElement}
+          <section className="maputnik-modal-section">
+            <h2>Upload Style</h2>
+            <p>Upload a JSON style from your computer.</p>
+            <FileReaderInput onChange={this.onUpload} tabIndex="-1">
+              <Button className="maputnik-upload-button"><MdFileUpload /> Upload</Button>
+            </FileReaderInput>
+          </section>
 
-      <section className="maputnik-modal-section">
-        <h2>Load from URL</h2>
-        <p>
-          Load from a URL. Note that the URL must have <a href="https://enable-cors.org" target="_blank" rel="noopener noreferrer">CORS enabled</a>.
-        </p>
-        <input type="text" ref={(input) => this.styleUrlElement = input} className="maputnik-input" placeholder="Enter URL..."/>
-        <div>
-          <Button className="maputnik-big-button" onClick={this.onOpenUrl.bind(this)}>Open URL</Button>
-        </div>
-      </section>
+          <section className="maputnik-modal-section">
+            <h2>Load from URL</h2>
+            <p>
+              Load from a URL. Note that the URL must have <a href="https://enable-cors.org" target="_blank" rel="noopener noreferrer">CORS enabled</a>.
+            </p>
+            <UrlInput
+              data-wd-key="open-modal.url.input"
+              type="text"
+              className="maputnik-input"
+              default="Enter URL..."
+              value={this.state.styleUrl}
+              onInput={this.onChangeUrl}
+            />
+            <div>
+              <Button
+                data-wd-key="open-modal.url.button"
+                className="maputnik-big-button"
+                onClick={this.onOpenUrl}
+                disabled={this.state.styleUrl.length < 1}
+              >Open URL</Button>
+            </div>
+          </section>
 
-      <section className="maputnik-modal-section maputnik-modal-section--shrink">
-        <h2>Gallery Styles</h2>
-        <p>
-          Open one of the publicly available styles to start from.
-        </p>
-        <div className="maputnik-style-gallery-container">
-        {styleOptions}
-        </div>
-      </section>
-    </Modal>
+          <section className="maputnik-modal-section maputnik-modal-section--shrink">
+            <h2>Gallery Styles</h2>
+            <p>
+              Open one of the publicly available styles to start from.
+            </p>
+            <div className="maputnik-style-gallery-container">
+            {styleOptions}
+            </div>
+          </section>
+        </Modal>
+
+        <LoadingModal
+          isOpen={!!this.state.activeRequest}
+          title={'Loading style'}
+          onCancel={(e) => this.onCancelActiveRequest(e)}
+          message={"Loading: "+this.state.activeRequestUrl}
+        />
+      </div>
+    )
   }
 }
 

src/components/modals/Overlay.jsx

@@ -1,24 +0,0 @@
-import React from 'react'
-import PropTypes from 'prop-types'
-
-
-class Overlay extends React.Component {
-  static propTypes = {
-    isOpen: PropTypes.bool.isRequired,
-    children: PropTypes.element.isRequired
-  }
-
-  render() {
-		let overlayStyle = {}
-		if(!this.props.isOpen) {
-			overlayStyle['display'] = 'none';
-		}
-
-    return <div className={"maputnik-overlay"} style={overlayStyle}>
-			<div className={"maputnik-overlay-viewport"} />
-      {this.props.children}
-    </div>
-  }
-}
-
-export default Overlay

src/components/modals/SettingsModal.jsx

@@ -1,102 +1,266 @@
 import React from 'react'
 import PropTypes from 'prop-types'
 
-import styleSpec from '@mapbox/mapbox-gl-style-spec/style-spec'
+import {latest} from '@mapbox/mapbox-gl-style-spec'
 import InputBlock from '../inputs/InputBlock'
+import ArrayInput from '../inputs/ArrayInput'
+import NumberInput from '../inputs/NumberInput'
 import StringInput from '../inputs/StringInput'
+import UrlInput from '../inputs/UrlInput'
 import SelectInput from '../inputs/SelectInput'
+import EnumInput from '../inputs/EnumInput'
+import ColorField from '../fields/ColorField'
 import Modal from './Modal'
+import fieldSpecAdditional from '../../libs/field-spec-additional'
 
 class SettingsModal extends React.Component {
   static propTypes = {
     mapStyle: PropTypes.object.isRequired,
     onStyleChanged: PropTypes.func.isRequired,
+    onChangeMetadataProperty: PropTypes.func.isRequired,
     isOpen: PropTypes.bool.isRequired,
     onOpenToggle: PropTypes.func.isRequired,
   }
 
-  constructor(props) {
-    super(props);
+  changeTransitionProperty(property, value) {
+    const transition = {
+      ...this.props.mapStyle.transition,
+    }
+
+    if (value === undefined) {
+      delete transition[property];
+    }
+    else {
+      transition[property] = value;
+    }
+
+    this.props.onStyleChanged({
+      ...this.props.mapStyle,
+      transition,
+    });
+  }
+
+  changeLightProperty(property, value) {
+    const light = {
+      ...this.props.mapStyle.light,
+    }
+
+    if (value === undefined) {
+      delete light[property];
+    }
+    else {
+      light[property] = value;
+    }
+
+    this.props.onStyleChanged({
+      ...this.props.mapStyle,
+      light,
+    });
   }
 
   changeStyleProperty(property, value) {
     const changedStyle = {
       ...this.props.mapStyle,
-      [property]: value
-    }
-    this.props.onStyleChanged(changedStyle)
-  }
+    };
 
-  changeMetadataProperty(property, value) {
-    const changedStyle = {
-      ...this.props.mapStyle,
-      metadata: {
-        ...this.props.mapStyle.metadata,
-        [property]: value
-      }
+    if (value === undefined) {
+      delete changedStyle[property];
     }
-    this.props.onStyleChanged(changedStyle)
+    else {
+      changedStyle[property] = value;
+    }
+    this.props.onStyleChanged(changedStyle);
   }
 
   render() {
     const metadata = this.props.mapStyle.metadata || {}
+    const {onChangeMetadataProperty, mapStyle} = this.props;
     const inputProps = { }
+
+    const light = this.props.mapStyle.light || {};
+    const transition = this.props.mapStyle.transition || {};
+
     return <Modal
+      data-wd-key="modal-settings"
       isOpen={this.props.isOpen}
       onOpenToggle={this.props.onOpenToggle}
       title={'Style Settings'}
     >
-      <div style={{minWidth: 350}}>
-      <InputBlock label={"Name"} doc={styleSpec.latest.$root.name.doc}>
+      <div className="modal-settings">
+      <InputBlock label={"Name"} fieldSpec={latest.$root.name}>
         <StringInput {...inputProps}
+          data-wd-key="modal-settings.name" 
           value={this.props.mapStyle.name}
           onChange={this.changeStyleProperty.bind(this, "name")}
         />
       </InputBlock>
-      <InputBlock label={"Owner"} doc={"Owner ID of the style. Used by Mapbox or future style APIs."}>
+      <InputBlock label={"Owner"} fieldSpec={{doc: "Owner ID of the style. Used by Mapbox or future style APIs."}}>
         <StringInput {...inputProps}
+          data-wd-key="modal-settings.owner" 
           value={this.props.mapStyle.owner}
           onChange={this.changeStyleProperty.bind(this, "owner")}
         />
       </InputBlock>
-      <InputBlock label={"Sprite URL"} doc={styleSpec.latest.$root.sprite.doc}>
-        <StringInput {...inputProps}
+      <InputBlock label={"Sprite URL"} fieldSpec={latest.$root.sprite}>
+        <UrlInput {...inputProps}
+          data-wd-key="modal-settings.sprite" 
           value={this.props.mapStyle.sprite}
           onChange={this.changeStyleProperty.bind(this, "sprite")}
         />
       </InputBlock>
 
-      <InputBlock label={"Glyphs URL"} doc={styleSpec.latest.$root.glyphs.doc}>
-        <StringInput {...inputProps}
+      <InputBlock label={"Glyphs URL"} fieldSpec={latest.$root.glyphs}>
+        <UrlInput {...inputProps}
+          data-wd-key="modal-settings.glyphs" 
           value={this.props.mapStyle.glyphs}
           onChange={this.changeStyleProperty.bind(this, "glyphs")}
         />
       </InputBlock>
 
-      <InputBlock label={"Mapbox Access Token"} doc={"Public access token for Mapbox services."}>
+      <InputBlock
+        label={fieldSpecAdditional.maputnik.mapbox_access_token.label} 
+        fieldSpec={fieldSpecAdditional.maputnik.mapbox_access_token}
+      >
         <StringInput {...inputProps}
+          data-wd-key="modal-settings.maputnik:mapbox_access_token" 
           value={metadata['maputnik:mapbox_access_token']}
-          onChange={this.changeMetadataProperty.bind(this, "maputnik:mapbox_access_token")}
+          onChange={onChangeMetadataProperty.bind(this, "maputnik:mapbox_access_token")}
         />
       </InputBlock>
 
-      <InputBlock label={"OpenMapTiles Access Token"} doc={"Public access token for the OpenMapTiles CDN."}>
+      <InputBlock
+        label={fieldSpecAdditional.maputnik.maptiler_access_token.label} 
+        fieldSpec={fieldSpecAdditional.maputnik.maptiler_access_token}
+      >
         <StringInput {...inputProps}
+          data-wd-key="modal-settings.maputnik:openmaptiles_access_token" 
           value={metadata['maputnik:openmaptiles_access_token']}
-          onChange={this.changeMetadataProperty.bind(this, "maputnik:openmaptiles_access_token")}
+          onChange={onChangeMetadataProperty.bind(this, "maputnik:openmaptiles_access_token")}
         />
       </InputBlock>
 
-      <InputBlock label={"Style Renderer"} doc={"Choose the default Maputnik renderer for this style."}>
+      <InputBlock
+        label={fieldSpecAdditional.maputnik.thunderforest_access_token.label} 
+        fieldSpec={fieldSpecAdditional.maputnik.thunderforest_access_token}
+      >
+        <StringInput {...inputProps}
+          data-wd-key="modal-settings.maputnik:thunderforest_access_token" 
+          value={metadata['maputnik:thunderforest_access_token']}
+          onChange={onChangeMetadataProperty.bind(this, "maputnik:thunderforest_access_token")}
+        />
+      </InputBlock>
+
+      <InputBlock label={"Center"} fieldSpec={latest.$root.center}>
+        <ArrayInput
+          length={2}
+          type="number"
+          value={mapStyle.center}
+          default={latest.$root.center.default || [0, 0]}
+          onChange={this.changeStyleProperty.bind(this, "center")}
+        />
+      </InputBlock>
+
+      <InputBlock label={"Zoom"} fieldSpec={latest.$root.zoom}>
+        <NumberInput
+          {...inputProps}
+          value={mapStyle.zoom}
+          default={latest.$root.zoom.default || 0}
+          onChange={this.changeStyleProperty.bind(this, "zoom")}
+        />
+      </InputBlock>
+
+      <InputBlock label={"Bearing"} fieldSpec={latest.$root.bearing}>
+        <NumberInput
+          {...inputProps}
+          value={mapStyle.bearing}
+          default={latest.$root.bearing.default}
+          onChange={this.changeStyleProperty.bind(this, "bearing")}
+        />
+      </InputBlock>
+
+      <InputBlock label={"Pitch"} fieldSpec={latest.$root.pitch}>
+        <NumberInput
+          {...inputProps}
+          value={mapStyle.pitch}
+          default={latest.$root.pitch.default}
+          onChange={this.changeStyleProperty.bind(this, "pitch")}
+        />
+      </InputBlock>
+
+      <InputBlock label={"Light anchor"} fieldSpec={latest.light.anchor}>
+        <EnumInput
+          {...inputProps}
+          value={light.anchor}
+          options={Object.keys(latest.light.anchor.values)}
+          default={latest.light.anchor.default}
+          onChange={this.changeLightProperty.bind(this, "anchor")}
+        />
+      </InputBlock>
+
+      <InputBlock label={"Light color"} fieldSpec={latest.light.color}>
+        <ColorField
+          {...inputProps}
+          value={light.color}
+          default={latest.light.color.default}
+          onChange={this.changeLightProperty.bind(this, "color")}
+        />
+      </InputBlock>
+
+      <InputBlock label={"Light intensity"} fieldSpec={latest.light.intensity}>
+        <NumberInput
+          {...inputProps}
+          value={light.intensity}
+          default={latest.light.intensity.default}
+          onChange={this.changeLightProperty.bind(this, "intensity")}
+        />
+      </InputBlock>
+
+      <InputBlock label={"Light position"} fieldSpec={latest.light.position}>
+        <ArrayInput
+          {...inputProps}
+          type="number"
+          length={latest.light.position.length}
+          value={light.position}
+          default={latest.light.position.default}
+          onChange={this.changeLightProperty.bind(this, "position")}
+        />
+      </InputBlock>
+
+      <InputBlock label={"Transition delay"} fieldSpec={latest.transition.delay}>
+        <NumberInput
+          {...inputProps}
+          value={transition.delay}
+          default={latest.transition.delay.default}
+          onChange={this.changeTransitionProperty.bind(this, "delay")}
+        />
+      </InputBlock>
+
+      <InputBlock label={"Transition duration"} fieldSpec={latest.transition.duration}>
+        <NumberInput
+          {...inputProps}
+          value={transition.duration}
+          default={latest.transition.duration.default}
+          onChange={this.changeTransitionProperty.bind(this, "duration")}
+        />
+      </InputBlock>
+
+      <InputBlock
+        label={fieldSpecAdditional.maputnik.style_renderer.label}
+        fieldSpec={fieldSpecAdditional.maputnik.style_renderer}
+      >
         <SelectInput {...inputProps}
+          data-wd-key="modal-settings.maputnik:renderer" 
           options={[
             ['mbgljs', 'MapboxGL JS'],
-            ['ol3', 'Open Layers 3'],
+            ['ol', 'Open Layers (experimental)'],
           ]}
           value={metadata['maputnik:renderer'] || 'mbgljs'}
-          onChange={this.changeMetadataProperty.bind(this, 'maputnik:renderer')}
+          onChange={onChangeMetadataProperty.bind(this, 'maputnik:renderer')}
         />
       </InputBlock>
+
+
+
       </div>
     </Modal>
   }

src/components/modals/ShortcutsModal.jsx

@@ -0,0 +1,72 @@
+import React from 'react'
+import PropTypes from 'prop-types'
+
+import Modal from './Modal'
+
+
+class ShortcutsModal extends React.Component {
+  static propTypes = {
+    isOpen: PropTypes.bool.isRequired,
+    onOpenToggle: PropTypes.func.isRequired,
+  }
+
+  render() {
+    const help = [
+      {
+        key: "?",
+        text: "Shortcuts menu"
+      },
+      {
+        key: "o",
+        text: "Open modal"
+      },
+      {
+        key: "e",
+        text: "Export modal"
+      },
+      {
+        key: "d",
+        text: "Data Sources modal"
+      },
+      {
+        key: "s",
+        text: "Style Settings modal"
+      },
+      {
+        key: "i",
+        text: "Toggle inspect"
+      },
+      {
+        key: "m",
+        text: "Focus map"
+      },
+      {
+        key: "!",
+        text: "Debug modal"
+      },
+    ]
+
+
+    return <Modal
+      data-wd-key="shortcuts-modal"
+      isOpen={this.props.isOpen}
+      onOpenToggle={this.props.onOpenToggle}
+      title={'Shortcuts'}
+    >
+      <div className="maputnik-modal-section maputnik-modal-shortcuts">
+        <p>
+          Press <code>ESC</code> to lose focus of any active elements, then press one of:
+        </p>
+        <ul>
+          {help.map((item) => {
+            return <li key={item.key}>
+              <code>{item.key}</code> {item.text}
+            </li>
+          })}
+        </ul>
+      </div>
+    </Modal>
+  }
+}
+
+export default ShortcutsModal

src/components/modals/SourcesModal.jsx

@@ -1,6 +1,6 @@
 import React from 'react'
 import PropTypes from 'prop-types'
-import styleSpec from '@mapbox/mapbox-gl-style-spec/style-spec'
+import {latest} from '@mapbox/mapbox-gl-style-spec'
 import Modal from './Modal'
 import Button from '../Button'
 import InputBlock from '../inputs/InputBlock'
@@ -12,8 +12,7 @@ import style from '../../libs/style'
 import { deleteSource, addSource, changeSource } from '../../libs/source'
 import publicSources from '../../config/tilesets.json'
 
-import AddIcon from 'react-icons/lib/md/add-circle-outline'
-import DeleteIcon from 'react-icons/lib/md/delete'
+import {MdAddCircleOutline, MdDelete} from 'react-icons/md'
 
 class PublicSource extends React.Component {
   static propTypes = {
@@ -34,7 +33,7 @@ class PublicSource extends React.Component {
 					<p className="maputnik-public-source-id">#{this.props.id}</p>
 				</div>
 				<span className="maputnik-space" />
-				<AddIcon />
+				<MdAddCircleOutline />
 			</Button>
     </div>
   }
@@ -45,11 +44,28 @@ function editorMode(source) {
     if(source.tiles) return 'tilexyz_raster'
     return 'tilejson_raster'
   }
+  if(source.type === 'raster-dem') {
+    if(source.tiles) return 'tilexyz_raster-dem'
+    return 'tilejson_raster-dem'
+  }
   if(source.type === 'vector') {
     if(source.tiles) return 'tilexyz_vector'
     return 'tilejson_vector'
   }
-  if(source.type === 'geojson') return 'geojson'
+  if(source.type === 'geojson') {
+    if (typeof(source.data) === "string") {
+      return 'geojson_url';
+    }
+    else {
+      return 'geojson_json';
+    }
+  }
+  if(source.type === 'image') {
+    return 'image';
+  }
+  if(source.type === 'video') {
+    return 'video';
+  }
   return null
 }
 
@@ -72,7 +88,7 @@ class ActiveSourceTypeEditor extends React.Component {
           onClick={()=> this.props.onDelete(this.props.sourceId)}
           style={{backgroundColor: 'transparent'}}
         >
-          <DeleteIcon />
+          <MdDelete />
         </Button>
       </div>
       <div className="maputnik-active-source-type-editor-content">
@@ -102,64 +118,128 @@ class AddSource extends React.Component {
 
   defaultSource(mode) {
     const source = (this.state || {}).source || {}
+    const {protocol} = window.location;
+
     switch(mode) {
-      case 'geojson': return {
+      case 'geojson_url': return {
         type: 'geojson',
-        data: source.data || 'http://localhost:3000/geojson.json'
+        data: `${protocol}//localhost:3000/geojson.json`
+      }
+      case 'geojson_json': return {
+        type: 'geojson',
+        data: {}
       }
       case 'tilejson_vector': return {
         type: 'vector',
-        url: source.url || 'http://localhost:3000/tilejson.json'
+        url: source.url || `${protocol}//localhost:3000/tilejson.json`
       }
       case 'tilexyz_vector': return {
         type: 'vector',
-        tiles: source.tiles || ['http://localhost:3000/{x}/{y}/{z}.pbf'],
+        tiles: source.tiles || [`${protocol}//localhost:3000/{x}/{y}/{z}.pbf`],
         minZoom: source.minzoom || 0,
         maxZoom: source.maxzoom || 14
       }
       case 'tilejson_raster': return {
         type: 'raster',
-        url: source.url || 'http://localhost:3000/tilejson.json'
+        url: source.url || `${protocol}//localhost:3000/tilejson.json`
       }
       case 'tilexyz_raster': return {
         type: 'raster',
-        tiles: source.tiles || ['http://localhost:3000/{x}/{y}/{z}.pbf'],
+        tiles: source.tiles || [`${protocol}//localhost:3000/{x}/{y}/{z}.pbf`],
         minzoom: source.minzoom || 0,
         maxzoom: source.maxzoom || 14
       }
+      case 'tilejson_raster-dem': return {
+        type: 'raster-dem',
+        url: source.url || `${protocol}//localhost:3000/tilejson.json`
+      }
+      case 'tilexyz_raster-dem': return {
+        type: 'raster-dem',
+        tiles: source.tiles || [`${protocol}//localhost:3000/{x}/{y}/{z}.pbf`],
+        minzoom: source.minzoom || 0,
+        maxzoom: source.maxzoom || 14
+      }
+      case 'image': return {
+        type: 'image',
+        url: `${protocol}//localhost:3000/image.png`,
+        coordinates: [
+          [0,0],
+          [0,0],
+          [0,0],
+          [0,0],
+        ],
+      }
+      case 'video': return {
+        type: 'video',
+        urls: [
+          `${protocol}//localhost:3000/movie.mp4`
+        ],
+        coordinates: [
+          [0,0],
+          [0,0],
+          [0,0],
+          [0,0],
+        ],
+      }
       default: return {}
     }
   }
 
+  onAdd = () => {
+    const {source, sourceId} = this.state;
+    this.props.onAdd(sourceId, source);
+  }
+
+  onChangeSource = (source) => {
+    this.setState({source});
+  }
+
   render() {
+    // Kind of a hack because the type changes, however maputnik has 1..n
+    // options per type, for example 
+    //
+    //  - 'geojson' - 'GeoJSON (URL)' and 'GeoJSON (JSON)'
+    //  - 'raster' - 'Raster (TileJSON URL)' and 'Raster (XYZ URL)'
+    //
+    // So we just ignore the values entirely as they are self explanatory
+    const sourceTypeFieldSpec = {
+      doc: latest.source_vector.type.doc
+    };
+
     return <div className="maputnik-add-source">
-      <InputBlock label={"Source ID"} doc={"Unique ID that identifies the source and is used in the layer to reference the source."}>
+      <InputBlock label={"Source ID"} fieldSpec={{doc: "Unique ID that identifies the source and is used in the layer to reference the source."}}>
         <StringInput
           value={this.state.sourceId}
           onChange={v => this.setState({ sourceId: v})}
         />
       </InputBlock>
-      <InputBlock label={"Source Type"} doc={styleSpec.latest.source_vector.type.doc}>
+      <InputBlock label={"Source Type"} fieldSpec={sourceTypeFieldSpec}>
         <SelectInput
           options={[
-            ['geojson', 'GeoJSON'],
+            ['geojson_json', 'GeoJSON (JSON)'],
+            ['geojson_url', 'GeoJSON (URL)'],
             ['tilejson_vector', 'Vector (TileJSON URL)'],
             ['tilexyz_vector', 'Vector (XYZ URLs)'],
             ['tilejson_raster', 'Raster (TileJSON URL)'],
             ['tilexyz_raster', 'Raster (XYZ URL)'],
+            ['tilejson_raster-dem', 'Raster DEM (TileJSON URL)'],
+            ['tilexyz_raster-dem', 'Raster DEM (XYZ URLs)'],
+            ['image', 'Image'],
+            ['video', 'Video'],
           ]}
           onChange={mode => this.setState({mode: mode, source: this.defaultSource(mode)})}
           value={this.state.mode}
         />
       </InputBlock>
       <SourceTypeEditor
-        onChange={src => this.setState({ source: src })}
+        onChange={this.onChangeSource}
         mode={this.state.mode}
         source={this.state.source}
       />
       <Button
         className="maputnik-add-source-button"
-				onClick={() => this.props.onAdd(this.state.sourceId, this.state.source)}>
+				onClick={this.onAdd}
+      >
         Add Source
       </Button>
     </div>
@@ -218,11 +298,14 @@ class SourcesModal extends React.Component {
       <div className="maputnik-modal-section">
         <h4>Choose Public Source</h4>
         <p>
-          Add one of the publicly availble sources to your style.
+          Add one of the publicly available sources to your style.
         </p>
-        <div style={{maxwidth: 500}}>
+        <div className="maputnik-public-sources" style={{maxwidth: 500}}>
         {tilesetOptions}
         </div>
+        <p>
+          <strong>Note:</strong> Some of the tilesets are not optimised for online use, and as a result the file sizes of the tiles can be quite large (heavy) for online vector rendering. Please review any tilesets before use.
+        </p>
       </div>
 
       <div className="maputnik-modal-section">

src/components/modals/SurveyModal.jsx

@@ -0,0 +1,39 @@
+import React from 'react'
+import PropTypes from 'prop-types'
+
+import Button from '../Button'
+import Modal from './Modal'
+
+import logoImage from 'maputnik-design/logos/logo-color.svg'
+
+class SurveyModal extends React.Component {
+  static propTypes = {
+    isOpen: PropTypes.bool.isRequired,
+    onOpenToggle: PropTypes.func.isRequired,
+  }
+
+  onClick = () => {
+    window.open('https://gregorywolanski.typeform.com/to/cPgaSY', '_blank');
+
+    this.props.onOpenToggle();
+  }
+
+  render() {
+    return <Modal
+      data-wd-key="modal-survey"
+      isOpen={this.props.isOpen}
+      onOpenToggle={this.props.onOpenToggle}
+      title="Maputnik Survey"
+    >
+      <div className="maputnik-modal-survey">
+        <div className="maputnik-modal-survey__logo" dangerouslySetInnerHTML={{__html: logoImage}} />
+        <h1>You + Maputnik = Maputnik better for you</h1>
+        <p className="maputnik-modal-survey__description">We don’t track you, so we don’t know how you use Maputnik. Help us make Maputnik better for you by completing a 7–minute survey carried out by our contributing designer.</p>
+        <Button onClick={this.onClick} className="maputnik-big-button maputnik-white-button maputnik-wide-button">Take the Maputnik Survey</Button>
+        <p className="maputnik-modal-survey__footnote">It takes 7 minutes, tops! Every question is optional.</p>
+      </div>
+    </Modal>
+  }
+}
+
+export default SurveyModal

src/components/sources/SourceTypeEditor.jsx

@@ -1,26 +1,36 @@
 import React from 'react'
 import PropTypes from 'prop-types'
-import styleSpec from '@mapbox/mapbox-gl-style-spec/style-spec'
+import {latest} from '@mapbox/mapbox-gl-style-spec'
 import InputBlock from '../inputs/InputBlock'
 import StringInput from '../inputs/StringInput'
+import UrlInput from '../inputs/UrlInput'
 import NumberInput from '../inputs/NumberInput'
+import SelectInput from '../inputs/SelectInput'
+import DynamicArrayInput from '../inputs/DynamicArrayInput'
+import ArrayInput from '../inputs/ArrayInput'
+import JSONEditor from '../layers/JSONEditor'
+
 
 class TileJSONSourceEditor extends React.Component {
   static propTypes = {
     source: PropTypes.object.isRequired,
     onChange: PropTypes.func.isRequired,
+    children: PropTypes.node,
   }
 
   render() {
-    return <InputBlock label={"TileJSON URL"} doc={styleSpec.latest.source_vector.url.doc}>
-      <StringInput
-        value={this.props.source.url}
-        onChange={url => this.props.onChange({
-          ...this.props.source,
-          url: url
-        })}
-      />
-    </InputBlock>
+    return <div>
+      <InputBlock label={"TileJSON URL"} fieldSpec={latest.source_vector.url}>
+        <UrlInput
+          value={this.props.source.url}
+          onChange={url => this.props.onChange({
+            ...this.props.source,
+            url: url
+          })}
+        />
+      </InputBlock>
+      {this.props.children}
+    </div>
   }
 }
 
@@ -28,6 +38,7 @@ class TileURLSourceEditor extends React.Component {
   static propTypes = {
     source: PropTypes.object.isRequired,
     onChange: PropTypes.func.isRequired,
+    children: PropTypes.node,
   }
 
   changeTileUrl(idx, value) {
@@ -43,8 +54,8 @@ class TileURLSourceEditor extends React.Component {
     const prefix = ['1st', '2nd', '3rd', '4th', '5th', '6th', '7th']
     const tiles = this.props.source.tiles || []
     return tiles.map((tileUrl, tileIndex) => {
-      return <InputBlock key={tileIndex} label={prefix[tileIndex] + " Tile URL"} doc={styleSpec.latest.source_vector.tiles.doc}>
-        <StringInput
+      return <InputBlock key={tileIndex} label={prefix[tileIndex] + " Tile URL"} fieldSpec={latest.source_vector.tiles}>
+        <UrlInput
           value={tileUrl}
           onChange={this.changeTileUrl.bind(this, tileIndex)}
         />
@@ -55,7 +66,7 @@ class TileURLSourceEditor extends React.Component {
   render() {
     return <div>
       {this.renderTileUrls()}
-      <InputBlock label={"Min Zoom"} doc={styleSpec.latest.source_vector.minzoom.doc}>
+      <InputBlock label={"Min Zoom"} fieldSpec={latest.source_vector.minzoom}>
         <NumberInput
           value={this.props.source.minzoom || 0}
           onChange={minzoom => this.props.onChange({
@@ -64,7 +75,7 @@ class TileURLSourceEditor extends React.Component {
           })}
         />
       </InputBlock>
-      <InputBlock label={"Max Zoom"} doc={styleSpec.latest.source_vector.maxzoom.doc}>
+      <InputBlock label={"Max Zoom"} fieldSpec={latest.source_vector.maxzoom}>
         <NumberInput
           value={this.props.source.maxzoom || 22}
           onChange={maxzoom => this.props.onChange({
@@ -73,20 +84,115 @@ class TileURLSourceEditor extends React.Component {
           })}
         />
       </InputBlock>
+      {this.props.children}
   </div>
 
   }
 }
 
-class GeoJSONSourceEditor extends React.Component {
+class ImageSourceEditor extends React.Component {
   static propTypes = {
     source: PropTypes.object.isRequired,
     onChange: PropTypes.func.isRequired,
   }
 
   render() {
-    return <InputBlock label={"GeoJSON Data"} doc={styleSpec.latest.source_geojson.data.doc}>
-      <StringInput
+    const changeCoord = (idx, val) => {
+      const coordinates = this.props.source.coordinates.slice(0);
+      coordinates[idx] = val;
+
+      this.props.onChange({
+        ...this.props.source,
+        coordinates,
+      });
+    }
+
+    return <div>
+      <InputBlock label={"Image URL"} doc={latest.source_image.url.doc}>
+        <UrlInput
+          value={this.props.source.url}
+          onChange={url => this.props.onChange({
+            ...this.props.source,
+            url,
+          })}
+        />
+      </InputBlock>
+      {["top left", "top right", "bottom right", "bottom left"].map((label, idx) => {
+        return (
+          <InputBlock label={`Coord ${label}`} key={label}>
+            <ArrayInput
+              length={2}
+              type="number"
+              value={this.props.source.coordinates[idx]}
+              default={[0, 0]}
+              onChange={(val) => changeCoord(idx, val)}
+            />
+          </InputBlock>
+        );
+      })}
+    </div>
+  }
+}
+
+class VideoSourceEditor extends React.Component {
+  static propTypes = {
+    source: PropTypes.object.isRequired,
+    onChange: PropTypes.func.isRequired,
+  }
+
+  render() {
+    const changeCoord = (idx, val) => {
+      const coordinates = this.props.source.coordinates.slice(0);
+      coordinates[idx] = val;
+
+      this.props.onChange({
+        ...this.props.source,
+        coordinates,
+      });
+    }
+
+    const changeUrls = (urls) => {
+      this.props.onChange({
+        ...this.props.source,
+        urls,
+      });
+    }
+
+    return <div>
+      <InputBlock label={"Video URL"} doc={latest.source_video.urls.doc}>
+        <DynamicArrayInput
+          type="string"
+          value={this.props.source.urls}
+          default={""}
+          onChange={changeUrls}
+        />
+      </InputBlock>
+      {["top left", "top right", "bottom right", "bottom left"].map((label, idx) => {
+        return (
+          <InputBlock label={`Coord ${label}`} key={label}>
+            <ArrayInput
+              length={2}
+              type="number"
+              value={this.props.source.coordinates[idx]}
+              default={[0, 0]}
+              onChange={val => changeCoord(idx, val)}
+            />
+          </InputBlock>
+        );
+      })}
+    </div>
+  }
+}
+
+class GeoJSONSourceUrlEditor extends React.Component {
+  static propTypes = {
+    source: PropTypes.object.isRequired,
+    onChange: PropTypes.func.isRequired,
+  }
+
+  render() {
+    return <InputBlock label={"GeoJSON URL"} fieldSpec={latest.source_geojson.data}>
+      <UrlInput
         value={this.props.source.data}
         onChange={data => this.props.onChange({
           ...this.props.source,
@@ -97,6 +203,28 @@ class GeoJSONSourceEditor extends React.Component {
   }
 }
 
+class GeoJSONSourceJSONEditor extends React.Component {
+  static propTypes = {
+    source: PropTypes.object.isRequired,
+    onChange: PropTypes.func.isRequired,
+  }
+
+  render() {
+    return <InputBlock label={"GeoJSON"} fieldSpec={latest.source_geojson.data}>
+      <JSONEditor
+        layer={this.props.source.data}
+        maxHeight={200}
+        onChange={data => {
+          this.props.onChange({
+            ...this.props.source,
+            data,
+          })
+        }}
+      />
+    </InputBlock>
+  }
+}
+
 class SourceTypeEditor extends React.Component {
   static propTypes = {
     mode: PropTypes.string.isRequired,
@@ -110,11 +238,27 @@ class SourceTypeEditor extends React.Component {
       onChange: this.props.onChange,
     }
     switch(this.props.mode) {
-      case 'geojson': return <GeoJSONSourceEditor {...commonProps} />
+      case 'geojson_url': return <GeoJSONSourceUrlEditor {...commonProps} />
+      case 'geojson_json': return <GeoJSONSourceJSONEditor {...commonProps} />
       case 'tilejson_vector': return <TileJSONSourceEditor {...commonProps} />
       case 'tilexyz_vector': return <TileURLSourceEditor {...commonProps} />
       case 'tilejson_raster': return <TileJSONSourceEditor {...commonProps} />
       case 'tilexyz_raster': return <TileURLSourceEditor {...commonProps} />
+      case 'tilejson_raster-dem': return <TileJSONSourceEditor {...commonProps} />
+      case 'tilexyz_raster-dem': return <TileURLSourceEditor {...commonProps}>
+        <InputBlock label={"Encoding"} fieldSpec={latest.source_raster_dem.encoding}>
+          <SelectInput
+            options={Object.keys(latest.source_raster_dem.encoding.values)}
+            onChange={encoding => this.props.onChange({
+              ...this.props.source,
+              encoding: encoding
+            })}
+            value={this.props.source.encoding || latest.source_raster_dem.encoding.default}
+          />
+        </InputBlock>
+      </TileURLSourceEditor>
+      case 'image': return <ImageSourceEditor {...commonProps} />
+      case 'video': return <VideoSourceEditor {...commonProps} />
       default: return null
     }
   }

src/components/util/SmallError.jsx

@@ -0,0 +1,20 @@
+import React from 'react'
+import PropTypes from 'prop-types'
+import './SmallError.scss';
+
+
+class SmallError extends React.Component {
+  static propTypes = {
+    children: PropTypes.node,
+  }
+
+  render () {
+    return (
+      <div className="SmallError">
+        Error: {this.props.children}
+      </div>
+    );
+  }
+}
+
+export default SmallError

src/components/util/SmallError.scss

@@ -0,0 +1,7 @@
+@import '../../styles/vars';
+
+.SmallError {
+  color: #E57373;
+  font-size: $font-size-6;
+  margin-top: $margin-2
+}

src/components/util/codemirror-mgl.js

@@ -0,0 +1,154 @@
+import jsonlint from 'jsonlint';
+import CodeMirror from 'codemirror';
+import jsonToAst from 'json-to-ast';
+import {expression, validate, latest} from '@mapbox/mapbox-gl-style-spec';
+
+
+CodeMirror.defineMode("mgl", function(config, parserConfig) {
+  // Just using the javascript mode with json enabled. Our logic is in the linter below.
+  return CodeMirror.modes.javascript(
+    {...config, json: true},
+    parserConfig
+  );
+});
+
+CodeMirror.registerHelper("lint", "mgl", function(text, opts, doc) {
+  const found = [];
+  const {parser} = jsonlint;
+  const {context} = opts;
+
+  parser.parseError = function(str, hash) {
+    const loc = hash.loc;
+    found.push({
+      from: CodeMirror.Pos(loc.first_line - 1, loc.first_column),
+      to: CodeMirror.Pos(loc.last_line - 1, loc.last_column),
+      message: str
+    });
+  };
+  try {
+    parser.parse(text);
+  }
+  catch (e) {}
+
+  if (found.length > 0) {
+    // JSON invalid so don't go any further
+    return found;
+  }
+
+  const ast = jsonToAst(text);
+  const input = JSON.parse(text);
+
+  function getArrayPositionalFromAst (node, path) {
+    if (!node) {
+      return undefined;
+    }
+    else if (path.length < 1) {
+      return node;
+    }
+    else if (!node.children) {
+      return undefined;
+    }
+    else {
+      const key = path[0];
+      let newNode;
+      if (key.match(/^[0-9]+$/)) {
+        newNode = node.children[path[0]];
+      }
+      else {
+        newNode = node.children.find(childNode => {
+          return (
+            childNode.key &&
+            childNode.key.type === "Identifier" &&
+            childNode.key.value === key
+          );
+        });
+        if (newNode) {
+          newNode = newNode.value;
+        }
+      }
+      return getArrayPositionalFromAst(newNode, path.slice(1))
+    }
+  }
+
+  let out;
+  if (context === "layer") {
+    // Just an empty style so we can validate a layer.
+    const errors = validate({
+      "version": 8,
+      "name": "Empty Style",
+      "metadata": {},
+      "sources": {},
+      "sprite": "",
+      "glyphs": "https://example.com/glyphs/{fontstack}/{range}.pbf",
+      "layers": [
+        input
+      ]
+    });
+
+    if (errors) {
+      out = {
+        result: "error",
+        value: errors
+          .filter(err => {
+            // Remove missing 'layer source' errors, because we don't include them
+            if (err.message.match(/^layers\[0\]: source ".*" not found$/)) {
+              return false;
+            }
+            else {
+              return true;
+            }
+          })
+          .map(err => {
+            // Remove the 'layers[0].' as we're validating the layer only here
+            const errMessageParts = err.message.replace(/^layers\[0\]./, "").split(":");
+            return {
+              key: errMessageParts[0],
+              message: errMessageParts[1],
+            };
+          })
+      }
+    }
+  }
+  else if (context === "expression") {
+    out = expression.createExpression(input, opts.spec);
+  }
+  else {
+    throw new Error(`Invalid context ${context}`);
+  }
+
+  if (out.result === "error") {
+    const errors = out.value;
+    errors.forEach(error => {
+      const {key, message} = error;
+
+      if (!key) {
+        const lastLineHandle = doc.getLineHandle(doc.lastLine());
+        const err = {
+          from: CodeMirror.Pos(doc.firstLine(), 0),
+          to: CodeMirror.Pos(doc.lastLine(), lastLineHandle.text.length),
+          message: message,
+        }
+        found.push(err);
+      }
+      else if (key) {
+        const path = key.replace(/^\[|\]$/g, "").split(/\.|[\[\]]+/).filter(Boolean)
+        const parsedError = getArrayPositionalFromAst(ast, path);
+        if (!parsedError) {
+          console.warn("Something went wrong parsing error:", error);
+          return;
+        }
+
+        const {loc} = parsedError;
+        const {start, end} = loc;
+
+        found.push({
+          from: CodeMirror.Pos(start.line - 1, start.column),
+          to: CodeMirror.Pos(end.line - 1, end.column),
+          message: message,
+        });
+      }
+    })
+  }
+
+  return found;
+});

src/components/util/format.js

@@ -0,0 +1,3 @@
+export function formatLayerId (id) {
+  return id === "" ? "[empty_string]" : `'${id}'`;
+}

src/config/empty-style.json

@@ -1,14 +1,9 @@
 {
   "version": 8,
   "name": "Empty Style",
-  "metadata": {
-    "mapbox:autocomposite": false,
-    "mapbox:type": "template",
-    "maputnik:renderer": "mbgljs",
-    "openmaptiles:version": "3.x"
-  },
-  "sources": { },
-  "glyphs": "https://demo.tileserver.org/fonts/{fontstack}/{range}.pbf",
-  "sprites": "https://demo.tileserver.org/fonts/{fontstack}/{range}.pbf",
+  "metadata": {},
+  "sources": {},
+  "sprite": "",
+  "glyphs": "https://orangemug.github.io/font-glyphs/glyphs/{fontstack}/{range}.pbf",
   "layers": []
 }

src/config/layout.json

@@ -71,7 +71,8 @@
             "fill-extrusion-translate-anchor",
             "fill-extrusion-pattern",
             "fill-extrusion-height",
-            "fill-extrusion-base"
+            "fill-extrusion-base",
+            "fill-extrusion-vertical-gradient"
           ]
         }
       ]
@@ -91,7 +92,8 @@
             "circle-stroke-width",
             "circle-pitch-scale",
             "circle-translate",
-            "circle-translate-anchor"
+            "circle-translate-anchor",
+            "circle-pitch-alignment"
           ]
         }
       ]
@@ -104,7 +106,8 @@
           "fields": [
             "symbol-placement",
             "symbol-spacing",
-            "symbol-avoid-edges"
+            "symbol-avoid-edges",
+            "symbol-z-order"
           ]
         },
         {
@@ -125,17 +128,21 @@
             "text-justify",
             "text-anchor",
             "text-max-angle",
+            "text-writing-mode",
             "text-rotate",
             "text-keep-upright",
             "text-transform",
             "text-offset",
-            "text-optional"
+            "text-optional",
+            "text-variable-anchor",
+            "text-radial-offset"
           ]
         },
         {
           "title": "Icon layout properties",
           "type": "properties",
           "fields": [
+            "icon-image",
             "icon-allow-overlap",
             "icon-ignore-placement",
             "icon-optional",
@@ -143,11 +150,12 @@
             "icon-size",
             "icon-text-fit",
             "icon-text-fit-padding",
-            "icon-image",
             "icon-rotate",
             "icon-padding",
             "icon-keep-upright",
-            "icon-offset" 
+            "icon-offset",
+            "icon-anchor",
+            "icon-pitch-alignment"
           ]
         },
         {
@@ -190,9 +198,43 @@
             "raster-brightness-max",
             "raster-saturation",
             "raster-contrast",
-            "raster-fade-duration"
+            "raster-fade-duration",
+            "raster-resampling"
           ]
         }
       ]
+    },
+    "hillshade": {
+      "groups": [
+        {
+          "title": "Paint properties",
+          "type": "properties",
+          "fields": [
+            "hillshade-illumination-direction",
+            "hillshade-illumination-anchor",
+            "hillshade-exaggeration",
+            "hillshade-shadow-color",
+            "hillshade-highlight-color",
+            "hillshade-accent-color"
+          ]
+        }
+      ]
+    },
+    "heatmap": {
+      "groups": [
+        {
+          "title": "Paint properties",
+          "type": "properties",
+          "fields": [
+            "heatmap-radius",
+            "heatmap-weight",
+            "heatmap-intensity",
+            "heatmap-opacity"
+          ]
+        }
+      ]
+    },
+    "invalid": {
+      "groups": []
     }
 }

src/config/styles.json

@@ -1,56 +1,68 @@
 [
+  {
+    "id": "osm-liberty",
+    "title": "OSM Liberty",
+    "url": "https://maputnik.github.io/osm-liberty/style.json",
+    "thumbnail": "https://maputnik.github.io/thumbnails/osm-liberty.png"
+  },
   {
     "id": "klokantech-basic",
     "title": "Klokantech Basic",
-    "url": "https://rawgit.com/openmaptiles/klokantech-basic-gl-style/master/style.json",
+    "url": "https://cdn.jsdelivr.net/gh/openmaptiles/klokantech-basic-gl-style@v1.9/style.json",
     "thumbnail": "https://maputnik.github.io/thumbnails/klokantech-basic.png"
   },
   {
     "id": "dark-matter",
     "title": "Dark Matter",
-    "url": "https://rawgit.com/openmaptiles/dark-matter-gl-style/master/style.json",
+    "url": "https://cdn.jsdelivr.net/gh/openmaptiles/dark-matter-gl-style@v1.8/style.json",
     "thumbnail": "https://maputnik.github.io/thumbnails/dark-matter.png"
   },
   {
     "id": "positron",
     "title": "Positron",
-    "url": "https://rawgit.com/openmaptiles/positron-gl-style/master/style.json",
+    "url": "https://cdn.jsdelivr.net/gh/openmaptiles/positron-gl-style@v1.8/style.json",
     "thumbnail": "https://maputnik.github.io/thumbnails/positron.png"
   },
   {
     "id": "osm-bright",
     "title": "OSM Bright",
-    "url": "https://rawgit.com/openmaptiles/osm-bright-gl-style/master/style.json",
+    "url": "https://cdn.jsdelivr.net/gh/openmaptiles/osm-bright-gl-style@v1.9/style.json",
     "thumbnail": "https://maputnik.github.io/thumbnails/osm-bright.png"
   },
   {
-    "id": "osm-liberty",
-    "title": "OSM Liberty",
-    "url": "https://rawgit.com/lukasmartinelli/osm-liberty/gh-pages/style.json",
-    "thumbnail": "https://cdn.rawgit.com/lukasmartinelli/osm-liberty/gh-pages/thumbnail.png"
+    "id": "toner-gl-style",
+    "title": "Toner",
+    "url": "https://cdn.jsdelivr.net/gh/openmaptiles/toner-gl-style@dcb6e64/style.json",
+    "thumbnail": "https://maputnik.github.io/thumbnails/toner.png"
+  },
+  {
+    "id": "os-zoomstack-outdoor",
+    "title": "Zoomstack Outdoor",
+    "url": "https://s3-eu-west-1.amazonaws.com/tiles.os.uk/v2/styles/open-zoomstack-outdoor/style.json",
+    "thumbnail": "https://maputnik.github.io/thumbnails/os-zoomstack-outdoor.png"
+  },
+  {
+    "id": "os-zoomstack-road",
+    "title": "Zoomstack Road",
+    "url": "https://s3-eu-west-1.amazonaws.com/tiles.os.uk/v2/styles/open-zoomstack-road/style.json",
+    "thumbnail": "https://maputnik.github.io/thumbnails/os-zoomstack-road.png"
+  },
+  {
+    "id": "os-zoomstack-light",
+    "title": "Zoomstack Light",
+    "url": "https://s3-eu-west-1.amazonaws.com/tiles.os.uk/v2/styles/open-zoomstack-light/style.json",
+    "thumbnail": "https://maputnik.github.io/thumbnails/os-zoomstack-light.png"
+  },
+  {
+    "id": "os-zoomstack-night",
+    "title": "Zoomstack Night",
+    "url": "https://s3-eu-west-1.amazonaws.com/tiles.os.uk/v2/styles/open-zoomstack-night/style.json",
+    "thumbnail": "https://maputnik.github.io/thumbnails/os-zoomstack-night.png"
   },
   {
     "id": "empty-style",
     "title": "Empty Style",
-    "url": "https://rawgit.com/maputnik/editor/master/src/config/empty-style.json",
+    "url": "https://cdn.jsdelivr.net/gh/maputnik/editor@9cf74ca405d2be0608b57db8109cf3a6af5b9f49/src/config/empty-style.json",
     "thumbnail": "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAYAAAAECAQAAAAHDYbIAAAAEUlEQVR42mP8/58BDhiJ4wAA974H/U5Xe1oAAAAASUVORK5CYII="
-  },
-  {
-    "id": "mapbox-satellite",
-    "title": "Mapbox Satellite",
-    "url": "https://rawgit.com/mapbox/mapbox-gl-styles/master/styles/satellite-v9.json",
-    "thumbnail": "https://maputnik.github.io/thumbnails/mapbox-satellite.png"
-  },
-  {
-    "id": "mapbox-bright",
-    "title": "Mapbox Bright",
-    "url": "https://rawgit.com/mapbox/mapbox-gl-styles/master/styles/bright-v9.json",
-    "thumbnail": "https://maputnik.github.io/thumbnails/mapbox-bright.png"
-  },
-  {
-    "id": "mapbox-basic",
-    "title": "Mapbox Basic",
-    "url": "https://rawgit.com/mapbox/mapbox-gl-styles/master/styles/basic-v9.json",
-    "thumbnail": "https://maputnik.github.io/thumbnails/mapbox-basic.png"
   }
 ]

src/config/tilesets.json

@@ -1,12 +1,22 @@
 {
-  "mapbox-streets": {
-    "type": "vector",
-    "url": "mapbox://mapbox.mapbox-streets-v7",
-    "title": "Mapbox Streets"
-  },
   "openmaptiles": {
     "type": "vector",
-    "url": "https://free.tilehosting.com/data/v3.json?key={key}",
+    "url": "https://api.maptiler.com/tiles/v3/tiles.json?key={key}",
     "title": "OpenMapTiles"
+  },
+  "thunderforest_transport": {
+    "type": "vector",
+    "url": "https://tile.thunderforest.com/thunderforest.transport-v1.json?apikey={key}",
+    "title": "Thunderforest Transport (heavy)"
+  },
+  "thunderforest_outdoors": {
+    "type": "vector",
+    "url": "https://tile.thunderforest.com/thunderforest.outdoors-v1.json?apikey={key}",
+    "title": "Thunderforest Outdoors (heavy)"
+  },
+  "open_zoomstack": {
+    "type": "vector",
+    "url": "https://s3-eu-west-1.amazonaws.com/tiles.os.uk/v2/data/vector/open-zoomstack/config.json",
+    "title": "OS Open Zoomstack"
   }
 }

src/config/tokens.json

@@ -1,4 +1,5 @@
 {
   "mapbox": "pk.eyJ1IjoibW9yZ2Vua2FmZmVlIiwiYSI6ImNpeHJmNXNmZTAwNHIycXBid2NqdTJibjMifQ.Dv1-GDpTWi0NP6xW9Fct1w",
-  "openmaptiles": "Og58UhhtiiTaLVlPtPgs"
+  "openmaptiles": "KDhMfHvorAFkFe64wlZb",
+  "thunderforest": "b71f7f0ba4064f5eb9e903859a9cf5c6"
 }

src/index.jsx

@@ -1,3 +1,4 @@
+import { IconContext } from "react-icons";
 import React from 'react';
 import ReactDOM from 'react-dom';
 
@@ -5,4 +6,12 @@ import './favicon.ico'
 import './styles/index.scss'
 import App from './components/App';
 
-ReactDOM.render(<App/>, document.querySelector("#app"));
+ReactDOM.render(
+  <IconContext.Provider value={{className: 'react-icons'}}>
+    <App/>
+  </IconContext.Provider>,
+  document.querySelector("#app")
+);
+
+// Hide the loader.
+document.querySelector(".loading").style.display = "none";

src/libs/accessibility.js

@@ -0,0 +1,12 @@
+import throttle from 'lodash.throttle'
+
+
+// Throttle for 3 seconds so when a user enables it they don't have to refresh the page.
+const reducedMotionEnabled = throttle(() => {
+  return window.matchMedia("(prefers-reduced-motion: reduce)").matches
+}, 3000);
+
+
+export default {
+  reducedMotionEnabled
+}

src/libs/apistore.js

@@ -1,33 +1,37 @@
-import request from 'request'
 import style from './style.js'
 import ReconnectingWebSocket from 'reconnecting-websocket'
 
-const host = 'localhost'
-const port = '8000'
-const localUrl = `http://${host}:${port}`
-const websocketUrl = `ws://${host}:${port}/ws`
-
-
 export class ApiStyleStore {
+
   constructor(opts) {
     this.onLocalStyleChange = opts.onLocalStyleChange || (() => {})
+    const port = opts.port || '8000'
+    const host = opts.host || 'localhost'
+    this.localUrl = `http://${host}:${port}`
+    this.websocketUrl = `ws://${host}:${port}/ws`
+    this.init = this.init.bind(this)
   }
 
   init(cb) {
-    request(localUrl + '/styles', (error, response, body) => {
-      if (!error && body && response.statusCode == 200) {
-        const styleIds = JSON.parse(body)
-        this.latestStyleId = styleIds[0]
-        this.notifyLocalChanges()
-        cb(null)
-      } else {
-        cb(new Error('Can not connect to style API'))
-      }
+    fetch(this.localUrl + '/styles', {
+      mode: 'cors',
+    })
+    .then((response) =>  {
+      return response.json();
+    })
+    .then((body) => {
+      const styleIds = body;
+      this.latestStyleId = styleIds[0]
+      this.notifyLocalChanges()
+      cb(null)
+    })
+    .catch(function(e) {
+      cb(new Error('Can not connect to style API'))
     })
   }
 
   notifyLocalChanges() {
-    const connection = new ReconnectingWebSocket(websocketUrl)
+    const connection = new ReconnectingWebSocket(this.websocketUrl)
     connection.onmessage = e => {
       if(!e.data) return
       console.log('Received style update from API')
@@ -44,8 +48,14 @@ export class ApiStyleStore {
 
   latestStyle(cb) {
     if(this.latestStyleId) {
-      request(localUrl + '/styles/' + this.latestStyleId, (error, response, body) => {
-        cb(style.ensureStyleValidity(JSON.parse(body)))
+      fetch(this.localUrl + '/styles/' + this.latestStyleId, {
+        mode: 'cors',
+      })
+      .then(function(response) {
+        return response.json();
+      })
+      .then(function(body) {
+        cb(style.ensureStyleValidity(body))
       })
     } else {
       throw new Error('No latest style available. You need to init the api backend first.')
@@ -55,11 +65,15 @@ export class ApiStyleStore {
   // Save current style replacing previous version
   save(mapStyle) {
     const id = mapStyle.id
-    request.put({
-      url: localUrl + '/styles/' + id,
-      json: true,
-      body: mapStyle
-    }, (error, response, body) => {
+    fetch(this.localUrl + '/styles/' + id, {
+      method: "PUT",
+      mode: 'cors',
+      headers: {
+        "Content-Type": "application/json; charset=utf-8",
+      },
+      body: JSON.stringify(mapStyle)
+    })
+    .catch(function(error) {
       if(error) console.error(error)
     })
     return mapStyle

src/libs/debug.js

@@ -0,0 +1,44 @@
+import querystring from 'querystring'
+
+
+const debugStore = {};
+
+function enabled() {
+  const qs = querystring.parse(window.location.search.slice(1));
+  if(qs.hasOwnProperty("debug")) {
+    return !!qs.debug.match(/^(|1|true)$/);
+  }
+  else {
+    return false;
+  }
+}
+
+function genErr() {
+  return new Error("Debug not enabled, enable by appending '?debug' to your query string");
+}
+
+function set(namespace, key, value) {
+  if(!enabled()) {
+    throw genErr();
+  }
+  debugStore[namespace] = debugStore[namespace] || {};
+  debugStore[namespace][key] = value;
+}
+
+function get(namespace, key) {
+  if(!enabled()) {
+    throw genErr();
+  }
+  if(debugStore.hasOwnProperty(namespace)) {
+    return debugStore[namespace][key];
+  }
+}
+
+const mod = {
+  enabled,
+  get,
+  set
+}
+
+window.debug = mod;
+export default mod;

src/libs/diffmessage.js

@@ -1,7 +1,7 @@
-import styleSpec from '@mapbox/mapbox-gl-style-spec/style-spec'
+import {diff} from '@mapbox/mapbox-gl-style-spec'
 
 export function diffMessages(beforeStyle, afterStyle) {
-  const changes = styleSpec.diff(beforeStyle, afterStyle)
+  const changes = diff(beforeStyle, afterStyle)
   return changes.map(cmd => cmd.command + ' ' + cmd.args.join(' '))
 }
 

src/libs/field-spec-additional.js

@@ -0,0 +1,22 @@
+const spec = {
+  maputnik: {
+    mapbox_access_token: {
+      label: "Mapbox Access Token",
+      doc: "Public access token for Mapbox services."
+    },
+    maptiler_access_token: {
+      label: "MapTiler Access Token",
+      doc: "Public access token for MapTiler Cloud."
+    },
+    thunderforest_access_token: {
+      label: "Thunderforest Access Token",
+      doc: "Public access token for Thunderforest services."
+    },
+    style_renderer: {
+      label: "Style Renderer",
+      doc: "Choose the default Maputnik renderer for this style.",
+    },
+  }
+}
+
+export default spec;

src/libs/filterops.js

@@ -1,6 +1,6 @@
-import styleSpec from '@mapbox/mapbox-gl-style-spec/style-spec'
+import {latest} from '@mapbox/mapbox-gl-style-spec'
 export const combiningFilterOps = ['all', 'any', 'none']
 export const setFilterOps = ['in', '!in']
 export const otherFilterOps = Object
-  .keys(styleSpec.latest.filter_operator.values)
+  .keys(latest.filter_operator.values)
   .filter(op => combiningFilterOps.indexOf(op) < 0)