From bcf4d9416c4d1c4b7e4e7147755b4d97897d0405 Mon Sep 17 00:00:00 2001
From: Tom Payne <twpayne@gmail.com>
Date: Tue, 10 Jul 2012 19:40:48 +0200
Subject: [PATCH] Add initial ol.MapRenderer skeleton

---
 src/all.js            |   1 +
 src/ol/maprenderer.js | 215 ++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 216 insertions(+)
 create mode 100644 src/ol/maprenderer.js

diff --git a/src/all.js b/src/all.js
index cf45c42432..5cc23c1d54 100644
--- a/src/all.js
+++ b/src/all.js
@@ -6,6 +6,7 @@ goog.require('ol.Camera');
 goog.require('ol.Extent');
 goog.require('ol.Layer');
 goog.require('ol.LayerRenderer');
+goog.require('ol.MapRenderer');
 goog.require('ol.Object');
 goog.require('ol.Projection');
 goog.require('ol.Store');
diff --git a/src/ol/maprenderer.js b/src/ol/maprenderer.js
new file mode 100644
index 0000000000..5340c1ac8e
--- /dev/null
+++ b/src/ol/maprenderer.js
@@ -0,0 +1,215 @@
+goog.provide('ol.MapRenderer');
+
+goog.require('goog.array');
+goog.require('goog.events');
+goog.require('ol.Array');
+goog.require('ol.Camera');
+goog.require('ol.LayerRenderer');
+goog.require('ol.Object');
+goog.require('ol.Projection');
+
+
+/**
+ * @enum {string}
+ */
+ol.MapRendererProperty = {
+  CAMERA: 'camera',
+  LAYERS: 'layers',
+  PROJECTION: 'projection'
+};
+
+
+
+/**
+ * @constructor
+ * @extends {ol.Object}
+ * @param {HTMLDivElement} target Target.
+ * @param {Object=} opt_values Values.
+ */
+ol.MapRenderer = function(target, opt_values) {
+
+  goog.base(this);
+
+  /**
+   * @private
+   * @type {HTMLDivElement}
+   */
+  this.target_ = target;
+
+  /**
+   * @private
+   * @type {Array.<number>}
+   */
+  this.layersListenerKeys_ = null;
+
+  /**
+   * @private
+   * @type {Object.<number, ol.LayerRenderer>}
+   */
+  this.layerRenderers_ = {};
+
+  goog.events.listen(
+      this, ol.Object.getChangedEventType(ol.MapRendererProperty.CAMERA),
+      this.handleCameraChanged, false, this);
+
+  goog.events.listen(
+      this, ol.Object.getChangedEventType(ol.MapRendererProperty.LAYERS),
+      this.handleLayersChanged, false, this);
+
+  if (goog.isDef(opt_values)) {
+    this.setValues(opt_values);
+  }
+
+};
+goog.inherits(ol.MapRenderer, ol.Object);
+
+
+/**
+ * @param {ol.Layer} layer Layer.
+ * @protected
+ * @return {ol.LayerRenderer} layerRenderer Layer renderer.
+ */
+ol.MapRenderer.prototype.createLayerRenderer = goog.abstractMethod;
+
+
+/**
+ * @return {ol.Camera} Camera.
+ */
+ol.MapRenderer.prototype.getCamera = function() {
+  return /** @type {ol.Camera} */ (this.get(ol.MapRendererProperty.CAMERA));
+};
+
+
+/**
+ * @return {ol.Array} Layers.
+ */
+ol.MapRenderer.prototype.getLayers = function() {
+  return /** @type {ol.Array} */ (this.get(ol.MapRendererProperty.LAYERS));
+};
+
+
+/**
+ * @return {ol.Projection} Projection.
+ */
+ol.MapRenderer.prototype.getProjection = function() {
+  return /** @type {ol.Projection} */ (
+      this.get(ol.MapRendererProperty.PROJECTION));
+};
+
+
+/**
+ * @return {HTMLDivElement} Target.
+ */
+ol.MapRenderer.prototype.getTarget = function() {
+  return this.target_;
+};
+
+
+/**
+ * @protected
+ */
+ol.MapRenderer.prototype.handleCameraChanged = function() {
+};
+
+
+/**
+ * @param {ol.Layer} layer Layer.
+ * @protected
+ */
+ol.MapRenderer.prototype.handleLayerAdd = function(layer) {
+  var key = goog.getUid(layer);
+  var layerRenderer = this.createLayerRenderer(layer);
+  this.layerRenderers_[key] = layerRenderer;
+};
+
+
+/**
+ * @param {ol.Layer} layer Layer.
+ * @protected
+ */
+ol.MapRenderer.prototype.handleLayerRemove = function(layer) {
+  var key = goog.getUid(layer);
+  goog.asserts.assert(key in this.layerRenderers_);
+  var layerRenderer = this.layerRenderers_[key];
+  delete this.layerRenderers_[key];
+  goog.dispose(layerRenderer);
+};
+
+
+/**
+ * @param {ol.ArrayEvent} event Event.
+ * @protected
+ */
+ol.MapRenderer.prototype.handleLayersInsertAt = function(event) {
+  var layers = /** @type {ol.Array} */ (event.target);
+  var layer = /** @type {ol.Layer} */ layers.getAt(event.index);
+  this.handleLayerAdd(layer);
+};
+
+
+/**
+ * @param {ol.ArrayEvent} event Event.
+ * @protected
+ */
+ol.MapRenderer.prototype.handleLayersRemoveAt = function(event) {
+  var layer = /** @type {ol.Layer} */ (event.prev);
+  this.handleLayerRemove(layer);
+};
+
+
+/**
+ * @param {ol.ArrayEvent} event Event.
+ * @protected
+ */
+ol.MapRenderer.prototype.handleLayersSetAt = function(event) {
+  var prevLayer = /** @type {ol.Layer} */ (event.prev);
+  this.handleLayerRemove(prevLayer);
+  var layers = /** @type {ol.Array} */ (event.target);
+  var layer = /** @type {ol.Layer} */ layers.getAt(event.index);
+  this.handleLayerAdd(layer);
+};
+
+
+/**
+ */
+ol.MapRenderer.prototype.handleLayersChanged = function() {
+  if (!goog.isNull(this.layersListenerKeys_)) {
+    goog.array.forEach(this.layersListenerKeys_, goog.events.unlistenByKey);
+    this.layersListenerKeys_ = null;
+  }
+  var layers = this.getLayers();
+  if (!goog.isNull(layers)) {
+    this.layersListenerKeys_ = [
+      goog.events.listen(layers, ol.ArrayEventType.INSERT_AT,
+          this.handleLayersInsertAt, false, this),
+      goog.events.listen(layers, ol.ArrayEventType.REMOVE_AT,
+          this.handleLayersRemoveAt, false, this),
+      goog.events.listen(layers, ol.ArrayEventType.SET_AT,
+          this.handleLayersSetAt, false, this)
+    ];
+  }
+};
+
+
+/**
+ * @param {ol.Camera} camera Camera.
+ */
+ol.MapRenderer.prototype.setCamera = function(camera) {
+  this.set(ol.MapRendererProperty.CAMERA, camera);
+};
+
+
+/**
+ * @param {ol.Array} layers Layers.
+ */
+ol.MapRenderer.prototype.setLayers = function(layers) {
+  this.set(ol.MapRendererProperty.LAYERS, layers);
+};
+
+
+/**
+ * @param {ol.Projection} projection Projection.
+ */
+ol.MapRenderer.prototype.setProjection = function(projection) {
+  this.set(ol.MapRendererProperty.PROJECTION, projection);
+};