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third_party/google_input_tools/third_party/closure_library/closure/goog/fx/dom.js

Index: third_party/google_input_tools/third_party/closure_library/closure/goog/fx/dom.js
diff --git a/third_party/google_input_tools/third_party/closure_library/closure/goog/fx/dom.js b/third_party/google_input_tools/third_party/closure_library/closure/goog/fx/dom.js
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+// Copyright 2005 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 Predefined DHTML animations such as slide, resize and fade.
+ *
+ * @see ../demos/effects.html
+ */
+
+goog.provide('goog.fx.dom');
+goog.provide('goog.fx.dom.BgColorTransform');
+goog.provide('goog.fx.dom.ColorTransform');
+goog.provide('goog.fx.dom.Fade');
+goog.provide('goog.fx.dom.FadeIn');
+goog.provide('goog.fx.dom.FadeInAndShow');
+goog.provide('goog.fx.dom.FadeOut');
+goog.provide('goog.fx.dom.FadeOutAndHide');
+goog.provide('goog.fx.dom.PredefinedEffect');
+goog.provide('goog.fx.dom.Resize');
+goog.provide('goog.fx.dom.ResizeHeight');
+goog.provide('goog.fx.dom.ResizeWidth');
+goog.provide('goog.fx.dom.Scroll');
+goog.provide('goog.fx.dom.Slide');
+goog.provide('goog.fx.dom.SlideFrom');
+goog.provide('goog.fx.dom.Swipe');
+
+goog.require('goog.color');
+goog.require('goog.events');
+goog.require('goog.fx.Animation');
+goog.require('goog.fx.Transition');
+goog.require('goog.style');
+goog.require('goog.style.bidi');
+
+
+
+/**
+ * Abstract class that provides reusable functionality for predefined animations
+ * that manipulate a single DOM element
+ *
+ * @param {Element} element Dom Node to be used in the animation.
+ * @param {Array<number>} start Array for start coordinates.
+ * @param {Array<number>} end Array for end coordinates.
+ * @param {number} time Length of animation in milliseconds.
+ * @param {Function=} opt_acc Acceleration function, returns 0-1 for inputs 0-1.
+ * @extends {goog.fx.Animation}
+ * @constructor
+ * @struct
+ */
+goog.fx.dom.PredefinedEffect = function(element, start, end, time, opt_acc) {
+  goog.fx.Animation.call(this, start, end, time, opt_acc);
+
+  /**
+   * DOM Node that will be used in the animation
+   * @type {Element}
+   */
+  this.element = element;
+
+  /**
+   * Whether the element is rendered right-to-left. We cache this here for
+   * efficiency.
+   * @private {boolean|undefined}
+   */
+  this.rightToLeft_;
+};
+goog.inherits(goog.fx.dom.PredefinedEffect, goog.fx.Animation);
+
+
+/**
+ * Called to update the style of the element.
+ * @protected
+ */
+goog.fx.dom.PredefinedEffect.prototype.updateStyle = goog.nullFunction;
+
+
+/**
+ * Whether the DOM element being manipulated is rendered right-to-left.
+ * @return {boolean} True if the DOM element is rendered right-to-left, false
+ *     otherwise.
+ */
+goog.fx.dom.PredefinedEffect.prototype.isRightToLeft = function() {
+  if (!goog.isDef(this.rightToLeft_)) {
+    this.rightToLeft_ = goog.style.isRightToLeft(this.element);
+  }
+  return this.rightToLeft_;
+};
+
+
+/** @override */
+goog.fx.dom.PredefinedEffect.prototype.onAnimate = function() {
+  this.updateStyle();
+  goog.fx.dom.PredefinedEffect.superClass_.onAnimate.call(this);
+};
+
+
+/** @override */
+goog.fx.dom.PredefinedEffect.prototype.onEnd = function() {
+  this.updateStyle();
+  goog.fx.dom.PredefinedEffect.superClass_.onEnd.call(this);
+};
+
+
+/** @override */
+goog.fx.dom.PredefinedEffect.prototype.onBegin = function() {
+  this.updateStyle();
+  goog.fx.dom.PredefinedEffect.superClass_.onBegin.call(this);
+};
+
+
+
+/**
+ * Creates an animation object that will slide an element from A to B.  (This
+ * in effect automatically sets up the onanimate event for an Animation object)
+ *
+ * Start and End should be 2 dimensional arrays
+ *
+ * @param {Element} element Dom Node to be used in the animation.
+ * @param {Array<number>} start 2D array for start coordinates (X, Y).
+ * @param {Array<number>} end 2D array for end coordinates (X, Y).
+ * @param {number} time Length of animation in milliseconds.
+ * @param {Function=} opt_acc Acceleration function, returns 0-1 for inputs 0-1.
+ * @extends {goog.fx.dom.PredefinedEffect}
+ * @constructor
+ * @struct
+ */
+goog.fx.dom.Slide = function(element, start, end, time, opt_acc) {
+  if (start.length != 2 || end.length != 2) {
+    throw Error('Start and end points must be 2D');
+  }
+  goog.fx.dom.PredefinedEffect.apply(this, arguments);
+};
+goog.inherits(goog.fx.dom.Slide, goog.fx.dom.PredefinedEffect);
+
+
+/** @override */
+goog.fx.dom.Slide.prototype.updateStyle = function() {
+  var pos = (this.isRightPositioningForRtlEnabled() && this.isRightToLeft()) ?
+      'right' : 'left';
+  this.element.style[pos] = Math.round(this.coords[0]) + 'px';
+  this.element.style.top = Math.round(this.coords[1]) + 'px';
+};
+
+
+
+/**
+ * Slides an element from its current position.
+ *
+ * @param {Element} element DOM node to be used in the animation.
+ * @param {Array<number>} end 2D array for end coordinates (X, Y).
+ * @param {number} time Length of animation in milliseconds.
+ * @param {Function=} opt_acc Acceleration function, returns 0-1 for inputs 0-1.
+ * @extends {goog.fx.dom.Slide}
+ * @constructor
+ * @struct
+ */
+goog.fx.dom.SlideFrom = function(element, end, time, opt_acc) {
+  /** @type {?Array<number>} */
+  this.startPoint;
+
+  var offsetLeft = this.isRightPositioningForRtlEnabled() ?
+      goog.style.bidi.getOffsetStart(element) :
+      /** @type {!HTMLElement} */ (element).offsetLeft;
+  var start = [offsetLeft, /** @type {!HTMLElement} */ (element).offsetTop];
+  goog.fx.dom.Slide.call(this, element, start, end, time, opt_acc);
+};
+goog.inherits(goog.fx.dom.SlideFrom, goog.fx.dom.Slide);
+
+
+/** @override */
+goog.fx.dom.SlideFrom.prototype.onBegin = function() {
+  var offsetLeft = this.isRightPositioningForRtlEnabled() ?
+      goog.style.bidi.getOffsetStart(this.element) : this.element.offsetLeft;
+  this.startPoint = [offsetLeft,
+                     /** @type {!HTMLElement} */ (this.element).offsetTop];
+  goog.fx.dom.SlideFrom.superClass_.onBegin.call(this);
+};
+
+
+
+/**
+ * Creates an animation object that will slide an element into its final size.
+ * Requires that the element is absolutely positioned.
+ *
+ * @param {Element} element Dom Node to be used in the animation.
+ * @param {Array<number>} start 2D array for start size (W, H).
+ * @param {Array<number>} end 2D array for end size (W, H).
+ * @param {number} time Length of animation in milliseconds.
+ * @param {Function=} opt_acc Acceleration function, returns 0-1 for inputs 0-1.
+ * @extends {goog.fx.dom.PredefinedEffect}
+ * @constructor
+ * @struct
+ */
+goog.fx.dom.Swipe = function(element, start, end, time, opt_acc) {
+  if (start.length != 2 || end.length != 2) {
+    throw Error('Start and end points must be 2D');
+  }
+  goog.fx.dom.PredefinedEffect.apply(this, arguments);
+
+  /**
+   * Maximum width for element.
+   * @type {number}
+   * @private
+   */
+  this.maxWidth_ = Math.max(this.endPoint[0], this.startPoint[0]);
+
+  /**
+   * Maximum height for element.
+   * @type {number}
+   * @private
+   */
+  this.maxHeight_ = Math.max(this.endPoint[1], this.startPoint[1]);
+};
+goog.inherits(goog.fx.dom.Swipe, goog.fx.dom.PredefinedEffect);
+
+
+/**
+ * Animation event handler that will resize an element by setting its width,
+ * height and clipping.
+ * @protected
+ * @override
+ */
+goog.fx.dom.Swipe.prototype.updateStyle = function() {
+  var x = this.coords[0];
+  var y = this.coords[1];
+  this.clip_(Math.round(x), Math.round(y), this.maxWidth_, this.maxHeight_);
+  this.element.style.width = Math.round(x) + 'px';
+  var marginX = (this.isRightPositioningForRtlEnabled() &&
+      this.isRightToLeft()) ? 'marginRight' : 'marginLeft';
+
+  this.element.style[marginX] = Math.round(x) - this.maxWidth_ + 'px';
+  this.element.style.marginTop = Math.round(y) - this.maxHeight_ + 'px';
+};
+
+
+/**
+ * Helper function for setting element clipping.
+ * @param {number} x Current element width.
+ * @param {number} y Current element height.
+ * @param {number} w Maximum element width.
+ * @param {number} h Maximum element height.
+ * @private
+ */
+goog.fx.dom.Swipe.prototype.clip_ = function(x, y, w, h) {
+  this.element.style.clip =
+      'rect(' + (h - y) + 'px ' + w + 'px ' + h + 'px ' + (w - x) + 'px)';
+};
+
+
+
+/**
+ * Creates an animation object that will scroll an element from A to B.
+ *
+ * Start and End should be 2 dimensional arrays
+ *
+ * @param {Element} element Dom Node to be used in the animation.
+ * @param {Array<number>} start 2D array for start scroll left and top.
+ * @param {Array<number>} end 2D array for end scroll left and top.
+ * @param {number} time Length of animation in milliseconds.
+ * @param {Function=} opt_acc Acceleration function, returns 0-1 for inputs 0-1.
+ * @extends {goog.fx.dom.PredefinedEffect}
+ * @constructor
+ * @struct
+ */
+goog.fx.dom.Scroll = function(element, start, end, time, opt_acc) {
+  if (start.length != 2 || end.length != 2) {
+    throw Error('Start and end points must be 2D');
+  }
+  goog.fx.dom.PredefinedEffect.apply(this, arguments);
+};
+goog.inherits(goog.fx.dom.Scroll, goog.fx.dom.PredefinedEffect);
+
+
+/**
+ * Animation event handler that will set the scroll position of an element.
+ * @protected
+ * @override
+ */
+goog.fx.dom.Scroll.prototype.updateStyle = function() {
+  if (this.isRightPositioningForRtlEnabled()) {
+    goog.style.bidi.setScrollOffset(this.element, Math.round(this.coords[0]));
+  } else {
+    this.element.scrollLeft = Math.round(this.coords[0]);
+  }
+  this.element.scrollTop = Math.round(this.coords[1]);
+};
+
+
+
+/**
+ * Creates an animation object that will resize an element between two widths
+ * and heights.
+ *
+ * Start and End should be 2 dimensional arrays
+ *
+ * @param {Element} element Dom Node to be used in the animation.
+ * @param {Array<number>} start 2D array for start width and height.
+ * @param {Array<number>} end 2D array for end width and height.
+ * @param {number} time Length of animation in milliseconds.
+ * @param {Function=} opt_acc Acceleration function, returns 0-1 for inputs 0-1.
+ * @extends {goog.fx.dom.PredefinedEffect}
+ * @constructor
+ * @struct
+ */
+goog.fx.dom.Resize = function(element, start, end, time, opt_acc) {
+  if (start.length != 2 || end.length != 2) {
+    throw Error('Start and end points must be 2D');
+  }
+  goog.fx.dom.PredefinedEffect.apply(this, arguments);
+};
+goog.inherits(goog.fx.dom.Resize, goog.fx.dom.PredefinedEffect);
+
+
+/**
+ * Animation event handler that will resize an element by setting its width and
+ * height.
+ * @protected
+ * @override
+ */
+goog.fx.dom.Resize.prototype.updateStyle = function() {
+  this.element.style.width = Math.round(this.coords[0]) + 'px';
+  this.element.style.height = Math.round(this.coords[1]) + 'px';
+};
+
+
+
+/**
+ * Creates an animation object that will resize an element between two widths
+ *
+ * Start and End should be numbers
+ *
+ * @param {Element} element Dom Node to be used in the animation.
+ * @param {number} start Start width.
+ * @param {number} end End width.
+ * @param {number} time Length of animation in milliseconds.
+ * @param {Function=} opt_acc Acceleration function, returns 0-1 for inputs 0-1.
+ * @extends {goog.fx.dom.PredefinedEffect}
+ * @constructor
+ * @struct
+ */
+goog.fx.dom.ResizeWidth = function(element, start, end, time, opt_acc) {
+  goog.fx.dom.PredefinedEffect.call(this, element, [start],
+                                    [end], time, opt_acc);
+};
+goog.inherits(goog.fx.dom.ResizeWidth, goog.fx.dom.PredefinedEffect);
+
+
+/**
+ * Animation event handler that will resize an element by setting its width.
+ * @protected
+ * @override
+ */
+goog.fx.dom.ResizeWidth.prototype.updateStyle = function() {
+  this.element.style.width = Math.round(this.coords[0]) + 'px';
+};
+
+
+
+/**
+ * Creates an animation object that will resize an element between two heights
+ *
+ * Start and End should be numbers
+ *
+ * @param {Element} element Dom Node to be used in the animation.
+ * @param {number} start Start height.
+ * @param {number} end End height.
+ * @param {number} time Length of animation in milliseconds.
+ * @param {Function=} opt_acc Acceleration function, returns 0-1 for inputs 0-1.
+ * @extends {goog.fx.dom.PredefinedEffect}
+ * @constructor
+ * @struct
+ */
+goog.fx.dom.ResizeHeight = function(element, start, end, time, opt_acc) {
+  goog.fx.dom.PredefinedEffect.call(this, element, [start],
+                                    [end], time, opt_acc);
+};
+goog.inherits(goog.fx.dom.ResizeHeight, goog.fx.dom.PredefinedEffect);
+
+
+/**
+ * Animation event handler that will resize an element by setting its height.
+ * @protected
+ * @override
+ */
+goog.fx.dom.ResizeHeight.prototype.updateStyle = function() {
+  this.element.style.height = Math.round(this.coords[0]) + 'px';
+};
+
+
+
+/**
+ * Creates an animation object that fades the opacity of an element between two
+ * limits.
+ *
+ * Start and End should be floats between 0 and 1
+ *
+ * @param {Element} element Dom Node to be used in the animation.
+ * @param {Array<number>|number} start 1D Array or Number with start opacity.
+ * @param {Array<number>|number} end 1D Array or Number for end opacity.
+ * @param {number} time Length of animation in milliseconds.
+ * @param {Function=} opt_acc Acceleration function, returns 0-1 for inputs 0-1.
+ * @extends {goog.fx.dom.PredefinedEffect}
+ * @constructor
+ * @struct
+ */
+goog.fx.dom.Fade = function(element, start, end, time, opt_acc) {
+  if (goog.isNumber(start)) start = [start];
+  if (goog.isNumber(end)) end = [end];
+
+  goog.fx.dom.Fade.base(this, 'constructor',
+      element, start, end, time, opt_acc);
+
+  if (start.length != 1 || end.length != 1) {
+    throw Error('Start and end points must be 1D');
+  }
+
+  /**
+   * The last opacity we set, or -1 for not set.
+   * @private {number}
+   */
+  this.lastOpacityUpdate_ = goog.fx.dom.Fade.OPACITY_UNSET_;
+};
+goog.inherits(goog.fx.dom.Fade, goog.fx.dom.PredefinedEffect);
+
+
+/**
+ * The quantization of opacity values to use.
+ * @private {number}
+ */
+goog.fx.dom.Fade.TOLERANCE_ = 1.0 / 0x400;  // 10-bit color
+
+
+/**
+ * Value indicating that the opacity must be set on next update.
+ * @private {number}
+ */
+goog.fx.dom.Fade.OPACITY_UNSET_ = -1;
+
+
+/**
+ * Animation event handler that will set the opacity of an element.
+ * @protected
+ * @override
+ */
+goog.fx.dom.Fade.prototype.updateStyle = function() {
+  var opacity = this.coords[0];
+  var delta = Math.abs(opacity - this.lastOpacityUpdate_);
+  // In order to keep eager browsers from over-rendering, only update
+  // on a potentially visible change in opacity.
+  if (delta >= goog.fx.dom.Fade.TOLERANCE_) {
+    goog.style.setOpacity(this.element, opacity);
+    this.lastOpacityUpdate_ = opacity;
+  }
+};
+
+
+/** @override */
+goog.fx.dom.Fade.prototype.onBegin = function() {
+  this.lastOpacityUpdate_ = goog.fx.dom.Fade.OPACITY_UNSET_;
+  goog.fx.dom.Fade.base(this, 'onBegin');
+};
+
+
+/** @override */
+goog.fx.dom.Fade.prototype.onEnd = function() {
+  this.lastOpacityUpdate_ = goog.fx.dom.Fade.OPACITY_UNSET_;
+  goog.fx.dom.Fade.base(this, 'onEnd');
+};
+
+
+/**
+ * Animation event handler that will show the element.
+ */
+goog.fx.dom.Fade.prototype.show = function() {
+  this.element.style.display = '';
+};
+
+
+/**
+ * Animation event handler that will hide the element
+ */
+goog.fx.dom.Fade.prototype.hide = function() {
+  this.element.style.display = 'none';
+};
+
+
+
+/**
+ * Fades an element out from full opacity to completely transparent.
+ *
+ * @param {Element} element Dom Node to be used in the animation.
+ * @param {number} time Length of animation in milliseconds.
+ * @param {Function=} opt_acc Acceleration function, returns 0-1 for inputs 0-1.
+ * @extends {goog.fx.dom.Fade}
+ * @constructor
+ * @struct
+ */
+goog.fx.dom.FadeOut = function(element, time, opt_acc) {
+  goog.fx.dom.Fade.call(this, element, 1, 0, time, opt_acc);
+};
+goog.inherits(goog.fx.dom.FadeOut, goog.fx.dom.Fade);
+
+
+
+/**
+ * Fades an element in from completely transparent to fully opacity.
+ *
+ * @param {Element} element Dom Node to be used in the animation.
+ * @param {number} time Length of animation in milliseconds.
+ * @param {Function=} opt_acc Acceleration function, returns 0-1 for inputs 0-1.
+ * @extends {goog.fx.dom.Fade}
+ * @constructor
+ * @struct
+ */
+goog.fx.dom.FadeIn = function(element, time, opt_acc) {
+  goog.fx.dom.Fade.call(this, element, 0, 1, time, opt_acc);
+};
+goog.inherits(goog.fx.dom.FadeIn, goog.fx.dom.Fade);
+
+
+
+/**
+ * Fades an element out from full opacity to completely transparent and then
+ * sets the display to 'none'
+ *
+ * @param {Element} element Dom Node to be used in the animation.
+ * @param {number} time Length of animation in milliseconds.
+ * @param {Function=} opt_acc Acceleration function, returns 0-1 for inputs 0-1.
+ * @extends {goog.fx.dom.Fade}
+ * @constructor
+ * @struct
+ */
+goog.fx.dom.FadeOutAndHide = function(element, time, opt_acc) {
+  goog.fx.dom.Fade.call(this, element, 1, 0, time, opt_acc);
+};
+goog.inherits(goog.fx.dom.FadeOutAndHide, goog.fx.dom.Fade);
+
+
+/** @override */
+goog.fx.dom.FadeOutAndHide.prototype.onBegin = function() {
+  this.show();
+  goog.fx.dom.FadeOutAndHide.superClass_.onBegin.call(this);
+};
+
+
+/** @override */
+goog.fx.dom.FadeOutAndHide.prototype.onEnd = function() {
+  this.hide();
+  goog.fx.dom.FadeOutAndHide.superClass_.onEnd.call(this);
+};
+
+
+
+/**
+ * Sets an element's display to be visible and then fades an element in from
+ * completely transparent to fully opaque.
+ *
+ * @param {Element} element Dom Node to be used in the animation.
+ * @param {number} time Length of animation in milliseconds.
+ * @param {Function=} opt_acc Acceleration function, returns 0-1 for inputs 0-1.
+ * @extends {goog.fx.dom.Fade}
+ * @constructor
+ * @struct
+ */
+goog.fx.dom.FadeInAndShow = function(element, time, opt_acc) {
+  goog.fx.dom.Fade.call(this, element, 0, 1, time, opt_acc);
+};
+goog.inherits(goog.fx.dom.FadeInAndShow, goog.fx.dom.Fade);
+
+
+/** @override */
+goog.fx.dom.FadeInAndShow.prototype.onBegin = function() {
+  this.show();
+  goog.fx.dom.FadeInAndShow.superClass_.onBegin.call(this);
+};
+
+
+
+/**
+ * Provides a transformation of an elements background-color.
+ *
+ * Start and End should be 3D arrays representing R,G,B
+ *
+ * @param {Element} element Dom Node to be used in the animation.
+ * @param {Array<number>} start 3D Array for RGB of start color.
+ * @param {Array<number>} end 3D Array for RGB of end color.
+ * @param {number} time Length of animation in milliseconds.
+ * @param {Function=} opt_acc Acceleration function, returns 0-1 for inputs 0-1.
+ * @extends {goog.fx.dom.PredefinedEffect}
+ * @constructor
+ * @struct
+ */
+goog.fx.dom.BgColorTransform = function(element, start, end, time, opt_acc) {
+  if (start.length != 3 || end.length != 3) {
+    throw Error('Start and end points must be 3D');
+  }
+  goog.fx.dom.PredefinedEffect.apply(this, arguments);
+};
+goog.inherits(goog.fx.dom.BgColorTransform, goog.fx.dom.PredefinedEffect);
+
+
+/**
+ * Animation event handler that will set the background-color of an element
+ */
+goog.fx.dom.BgColorTransform.prototype.setColor = function() {
+  var coordsAsInts = [];
+  for (var i = 0; i < this.coords.length; i++) {
+    coordsAsInts[i] = Math.round(this.coords[i]);
+  }
+  var color = 'rgb(' + coordsAsInts.join(',') + ')';
+  this.element.style.backgroundColor = color;
+};
+
+
+/** @override */
+goog.fx.dom.BgColorTransform.prototype.updateStyle = function() {
+  this.setColor();
+};
+
+
+/**
+ * Fade elements background color from start color to the element's current
+ * background color.
+ *
+ * Start should be a 3D array representing R,G,B
+ *
+ * @param {Element} element Dom Node to be used in the animation.
+ * @param {Array<number>} start 3D Array for RGB of start color.
+ * @param {number} time Length of animation in milliseconds.
+ * @param {goog.events.EventHandler=} opt_eventHandler Optional event handler
+ *     to use when listening for events.
+ */
+goog.fx.dom.bgColorFadeIn = function(element, start, time, opt_eventHandler) {
+  var initialBgColor = element.style.backgroundColor || '';
+  var computedBgColor = goog.style.getBackgroundColor(element);
+  var end;
+
+  if (computedBgColor && computedBgColor != 'transparent' &&
+      computedBgColor != 'rgba(0, 0, 0, 0)') {
+    end = goog.color.hexToRgb(goog.color.parse(computedBgColor).hex);
+  } else {
+    end = [255, 255, 255];
+  }
+
+  var anim = new goog.fx.dom.BgColorTransform(element, start, end, time);
+
+  function setBgColor() {
+    element.style.backgroundColor = initialBgColor;
+  }
+
+  if (opt_eventHandler) {
+    opt_eventHandler.listen(
+        anim, goog.fx.Transition.EventType.END, setBgColor);
+  } else {
+    goog.events.listen(
+        anim, goog.fx.Transition.EventType.END, setBgColor);
+  }
+
+  anim.play();
+};
+
+
+
+/**
+ * Provides a transformation of an elements color.
+ *
+ * @param {Element} element Dom Node to be used in the animation.
+ * @param {Array<number>} start 3D Array representing R,G,B.
+ * @param {Array<number>} end 3D Array representing R,G,B.
+ * @param {number} time Length of animation in milliseconds.
+ * @param {Function=} opt_acc Acceleration function, returns 0-1 for inputs 0-1.
+ * @constructor
+ * @struct
+ * @extends {goog.fx.dom.PredefinedEffect}
+ */
+goog.fx.dom.ColorTransform = function(element, start, end, time, opt_acc) {
+  if (start.length != 3 || end.length != 3) {
+    throw Error('Start and end points must be 3D');
+  }
+  goog.fx.dom.PredefinedEffect.apply(this, arguments);
+};
+goog.inherits(goog.fx.dom.ColorTransform, goog.fx.dom.PredefinedEffect);
+
+
+/**
+ * Animation event handler that will set the color of an element.
+ * @protected
+ * @override
+ */
+goog.fx.dom.ColorTransform.prototype.updateStyle = function() {
+  var coordsAsInts = [];
+  for (var i = 0; i < this.coords.length; i++) {
+    coordsAsInts[i] = Math.round(this.coords[i]);
+  }
+  var color = 'rgb(' + coordsAsInts.join(',') + ')';
+  this.element.style.color = color;
+};