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// Copyright 2011 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 CSS3 transition base library.
*
* @author chrishenry@google.com (Chris Henry)
*/
goog.provide('goog.fx.css3.Transition');
goog.require('goog.Timer');
goog.require('goog.asserts');
goog.require('goog.fx.TransitionBase');
goog.require('goog.style');
goog.require('goog.style.transition');
/**
* A class to handle targeted CSS3 transition. This class
* handles common features required for targeted CSS3 transition.
*
* Browser that does not support CSS3 transition will still receive all
* the events fired by the transition object, but will not have any transition
* played. If the browser supports the final state as set in setFinalState
* method, the element will ends in the final state.
*
* Transitioning multiple properties with the same setting is possible
* by setting Css3Property's property to 'all'. Performing multiple
* transitions can be done via setting multiple initialStyle,
* finalStyle and transitions. Css3Property's delay can be used to
* delay one of the transition. Here is an example for a transition
* that expands on the width and then followed by the height:
*
* <pre>
* var animation = new goog.fx.css3.Transition(
* element,
* duration,
* {width: 10px, height: 10px},
* {width: 100px, height: 100px},
* [
* {property: width, duration: 1, timing: 'ease-in', delay: 0},
* {property: height, duration: 1, timing: 'ease-in', delay: 1}
* ]
* );
* </pre>
*
* @param {Element} element The element to be transitioned.
* @param {number} duration The duration of the transition in seconds.
* This should be the longest of all transitions.
* @param {Object} initialStyle Initial style properties of the element before
* animating. Set using {@code goog.style.setStyle}.
* @param {Object} finalStyle Final style properties of the element after
* animating. Set using {@code goog.style.setStyle}.
* @param {goog.style.transition.Css3Property|
* Array<goog.style.transition.Css3Property>} transitions A single CSS3
* transition property or an array of it.
* @extends {goog.fx.TransitionBase}
* @constructor
* @struct
*/
goog.fx.css3.Transition = function(
element, duration, initialStyle, finalStyle, transitions) {
goog.fx.css3.Transition.base(this, 'constructor');
/**
* Timer id to be used to cancel animation part-way.
* @private {number}
*/
this.timerId_;
/**
* @type {Element}
* @private
*/
this.element_ = element;
/**
* @type {number}
* @private
*/
this.duration_ = duration;
/**
* @type {Object}
* @private
*/
this.initialStyle_ = initialStyle;
/**
* @type {Object}
* @private
*/
this.finalStyle_ = finalStyle;
/**
* @type {Array<goog.style.transition.Css3Property>}
* @private
*/
this.transitions_ = goog.isArray(transitions) ? transitions : [transitions];
};
goog.inherits(goog.fx.css3.Transition, goog.fx.TransitionBase);
/** @override */
goog.fx.css3.Transition.prototype.play = function() {
if (this.isPlaying()) {
return false;
}
this.onBegin();
this.onPlay();
this.startTime = goog.now();
this.setStatePlaying();
if (goog.style.transition.isSupported()) {
goog.style.setStyle(this.element_, this.initialStyle_);
// Allow element to get updated to its initial state before installing
// CSS3 transition.
this.timerId_ = goog.Timer.callOnce(this.play_, undefined, this);
return true;
} else {
this.stop_(false);
return false;
}
};
/**
* Helper method for play method. This needs to be executed on a timer.
* @private
*/
goog.fx.css3.Transition.prototype.play_ = function() {
// This measurement of the DOM element causes the browser to recalculate its
// initial state before the transition starts.
goog.style.getSize(this.element_);
goog.style.transition.set(this.element_, this.transitions_);
goog.style.setStyle(this.element_, this.finalStyle_);
this.timerId_ = goog.Timer.callOnce(
goog.bind(this.stop_, this, false), this.duration_ * 1000);
};
/** @override */
goog.fx.css3.Transition.prototype.stop = function() {
if (!this.isPlaying()) return;
this.stop_(true);
};
/**
* Helper method for stop method.
* @param {boolean} stopped If the transition was stopped.
* @private
*/
goog.fx.css3.Transition.prototype.stop_ = function(stopped) {
goog.style.transition.removeAll(this.element_);
// Clear the timer.
goog.Timer.clear(this.timerId_);
// Make sure that we have reached the final style.
goog.style.setStyle(this.element_, this.finalStyle_);
this.endTime = goog.now();
this.setStateStopped();
if (stopped) {
this.onStop();
} else {
this.onFinish();
}
this.onEnd();
};
/** @override */
goog.fx.css3.Transition.prototype.disposeInternal = function() {
this.stop();
goog.fx.css3.Transition.base(this, 'disposeInternal');
};
/**
* Pausing CSS3 Transitions in not supported.
* @override
*/
goog.fx.css3.Transition.prototype.pause = function() {
goog.asserts.assert(false, 'Css3 transitions does not support pause action.');
};
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