Adding mapbox-gl branch

2015-03-16 18:50:27 +01:00
parent 7985f030fa
commit 57ee7f52fd
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+// Copyright 2014 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/**
+ * @fileoverview This class aims to smooth out inconsistencies between browser
+ * handling of wheel events by providing an event that is similar to that
+ * defined in the standard, but also easier to consume.
+ *
+ * It is based upon the WheelEvent, which allows for up to 3 dimensional
+ * scrolling events that come in units of either pixels, lines or pages.
+ * http://www.w3.org/TR/2014/WD-DOM-Level-3-Events-20140925/#interface-WheelEvent
+ *
+ * The significant difference here is that it also provides reasonable pixel
+ * deltas for clients that do not want to treat line and page scrolling events
+ * specially.
+ *
+ * Clients of this code should be aware that some input devices only fire a few
+ * discrete events (such as a mouse wheel without acceleration) whereas some can
+ * generate a large number of events for a single interaction (such as a
+ * touchpad with acceleration). There is no signal in the events to reliably
+ * distinguish between these.
+ *
+ * @see ../demos/wheelhandler.html
+ */
+
+goog.provide('goog.events.WheelEvent');
+
+goog.require('goog.asserts');
+goog.require('goog.events.BrowserEvent');
+
+
+
+/**
+ * A common class for wheel events. This is used with the WheelHandler.
+ *
+ * @param {Event} browserEvent Browser event object.
+ * @param {goog.events.WheelEvent.DeltaMode} deltaMode The delta mode units of
+ *     the wheel event.
+ * @param {number} deltaX The number of delta units the user in the X axis.
+ * @param {number} deltaY The number of delta units the user in the Y axis.
+ * @param {number} deltaZ The number of delta units the user in the Z axis.
+ * @constructor
+ * @extends {goog.events.BrowserEvent}
+ * @final
+ */
+goog.events.WheelEvent = function(
+    browserEvent, deltaMode, deltaX, deltaY, deltaZ) {
+  goog.events.WheelEvent.base(this, 'constructor', browserEvent);
+  goog.asserts.assert(browserEvent, 'Expecting a non-null browserEvent');
+
+  /** @type {goog.events.WheelEvent.EventType} */
+  this.type = goog.events.WheelEvent.EventType.WHEEL;
+
+  /**
+   * An enum corresponding to the units of this event.
+   * @type {goog.events.WheelEvent.DeltaMode}
+   */
+  this.deltaMode = deltaMode;
+
+  /**
+   * The number of delta units in the X axis.
+   * @type {number}
+   */
+  this.deltaX = deltaX;
+
+  /**
+   * The number of delta units in the Y axis.
+   * @type {number}
+   */
+  this.deltaY = deltaY;
+
+  /**
+   * The number of delta units in the Z axis.
+   * @type {number}
+   */
+  this.deltaZ = deltaZ;
+
+  // Ratio between delta and pixel values.
+  var pixelRatio = 1;  // Value for DeltaMode.PIXEL
+  switch (deltaMode) {
+    case goog.events.WheelEvent.DeltaMode.PAGE:
+      pixelRatio *= goog.events.WheelEvent.PIXELS_PER_PAGE_;
+      break;
+    case goog.events.WheelEvent.DeltaMode.LINE:
+      pixelRatio *= goog.events.WheelEvent.PIXELS_PER_LINE_;
+      break;
+  }
+
+  /**
+   * The number of delta pixels in the X axis. Code that doesn't want to handle
+   * different deltaMode units can just look here.
+   * @type {number}
+   */
+  this.pixelDeltaX = this.deltaX * pixelRatio;
+
+  /**
+   * The number of pixels in the Y axis. Code that doesn't want to
+   * handle different deltaMode units can just look here.
+   * @type {number}
+   */
+  this.pixelDeltaY = this.deltaY * pixelRatio;
+
+  /**
+   * The number of pixels scrolled in the Z axis. Code that doesn't want to
+   * handle different deltaMode units can just look here.
+   * @type {number}
+   */
+  this.pixelDeltaZ = this.deltaZ * pixelRatio;
+};
+goog.inherits(goog.events.WheelEvent, goog.events.BrowserEvent);
+
+
+/**
+ * Enum type for the events fired by the wheel handler.
+ * @enum {string}
+ */
+goog.events.WheelEvent.EventType = {
+  /** The user has provided wheel-based input. */
+  WHEEL: 'wheel'
+};
+
+
+/**
+ * Units for the deltas in a WheelEvent.
+ * @enum {number}
+ */
+goog.events.WheelEvent.DeltaMode = {
+  /** The units are in pixels. From DOM_DELTA_PIXEL. */
+  PIXEL: 0,
+  /** The units are in lines. From DOM_DELTA_LINE. */
+  LINE: 1,
+  /** The units are in pages. From DOM_DELTA_PAGE. */
+  PAGE: 2
+};
+
+
+/**
+ * A conversion number between line scroll units and pixel scroll units. The
+ * actual value per line can vary a lot between devices and font sizes. This
+ * number can not be perfect, but it should be reasonable for converting lines
+ * scroll events into pixels.
+ * @const {number}
+ * @private
+ */
+goog.events.WheelEvent.PIXELS_PER_LINE_ = 15;
+
+
+/**
+ * A conversion number between page scroll units and pixel scroll units. The
+ * actual value per page can vary a lot as many different devices have different
+ * screen sizes, and the window might not be taking up the full screen. This
+ * number can not be perfect, but it should be reasonable for converting page
+ * scroll events into pixels.
+ * @const {number}
+ * @private
+ */
+goog.events.WheelEvent.PIXELS_PER_PAGE_ = 30 *
+    goog.events.WheelEvent.PIXELS_PER_LINE_;