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// Copyright (c) 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
'use strict';
base.require('base.event_target');
base.require('base.raf');
base.require('ui.animation');
base.exportTo('ui', function() {
/**
* Manages execution, queueing and blending of ui.Animations against
* a single target.
*
* Targets must have a cloneAnimationState() method that returns all the
* animatable states of that target.
*
* @constructor
* @extends {base.EventTarget}
*/
function AnimationController() {
base.EventTarget.call(this);
this.target_ = undefined;
this.activeAnimation_ = undefined;
this.tickScheduled_ = false;
}
AnimationController.prototype = {
__proto__: base.EventTarget.prototype,
get target() {
return this.target_;
},
set target(target) {
if (this.activeAnimation_)
throw new Error('Cannot change target while animation is running.');
if (target.cloneAnimationState === undefined ||
typeof target.cloneAnimationState !== 'function')
throw new Error('target must have a cloneAnimationState function');
this.target_ = target;
},
get activeAnimation() {
return this.activeAnimation_;
},
get hasActiveAnimation() {
return !!this.activeAnimation_;
},
queueAnimation: function(animation, opt_now) {
if (this.target_ === undefined)
throw new Error('Cannot queue animations without a target');
var now;
if (opt_now !== undefined)
now = opt_now;
else
now = window.performance.now();
if (this.activeAnimation_) {
// Must tick the animation before stopping it case its about to stop,
// and to update the target with its final sets of edits up to this
// point.
var done = this.activeAnimation_.tick(now, this.target_);
if (done)
this.activeAnimation_ = undefined;
}
if (this.activeAnimation_) {
if (animation.canTakeOverFor(this.activeAnimation_)) {
this.activeAnimation_.didStopEarly(now, this.target_, true);
animation.takeOverFor(this.activeAnimation_, now, this.target_);
} else {
this.activeAnimation_.didStopEarly(now, this.target_, false);
}
}
this.activeAnimation_ = animation;
this.activeAnimation_.start(now, this.target_);
if (this.tickScheduled_)
return;
this.tickScheduled_ = true;
base.requestAnimationFrame(this.tickActiveAnimation_, this);
},
cancelActiveAnimation: function(opt_now) {
if (!this.activeAnimation_)
return;
var now;
if (opt_now !== undefined)
now = opt_now;
else
now = window.performance.now();
this.activeAnimation_.didStopEarly(now, this.target_, false);
this.activeAnimation_ = undefined;
},
tickActiveAnimation_: function(frameBeginTime) {
this.tickScheduled_ = false;
if (!this.activeAnimation_)
return;
if (this.target_ === undefined) {
this.activeAnimation_.didStopEarly(frameBeginTime, this.target_, false);
return;
}
var oldTargetState = this.target_.cloneAnimationState();
var done = this.activeAnimation_.tick(frameBeginTime, this.target_);
if (done)
this.activeAnimation_ = undefined;
if (this.activeAnimation_) {
this.tickScheduled_ = true;
base.requestAnimationFrame(this.tickActiveAnimation_, this);
}
if (oldTargetState) {
var e = new Event('didtick');
e.oldTargetState = oldTargetState;
this.dispatchEvent(e, false, false);
}
}
};
return {
AnimationController: AnimationController
};
});
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