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// Copyright 2014 Google Inc. 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.
(function(shared, scope, testing) {
var originalRequestAnimationFrame = window.requestAnimationFrame;
var rafCallbacks = [];
var rafId = 0;
window.requestAnimationFrame = function(f) {
var id = rafId++;
if (rafCallbacks.length == 0 && !WEB_ANIMATIONS_TESTING) {
originalRequestAnimationFrame(processRafCallbacks);
}
rafCallbacks.push([id, f]);
return id;
};
window.cancelAnimationFrame = function(id) {
rafCallbacks.forEach(function(entry) {
if (entry[0] == id) {
entry[1] = function() {};
}
});
};
function processRafCallbacks(t) {
var processing = rafCallbacks;
rafCallbacks = [];
if (t < timeline.currentTime)
t = timeline.currentTime;
timeline._animations.sort(compareAnimations);
timeline._animations = tick(t, true, timeline._animations)[0];
processing.forEach(function(entry) { entry[1](t); });
applyPendingEffects();
_now = undefined;
}
function compareAnimations(leftAnimation, rightAnimation) {
return leftAnimation._sequenceNumber - rightAnimation._sequenceNumber;
}
function InternalTimeline() {
this._animations = [];
// Android 4.3 browser has window.performance, but not window.performance.now
this.currentTime = window.performance && performance.now ? performance.now() : 0;
};
InternalTimeline.prototype = {
_play: function(effect) {
effect._timing = shared.normalizeTimingInput(effect.timing);
var animation = new scope.Animation(effect);
animation._idle = false;
animation._timeline = this;
this._animations.push(animation);
scope.restart();
scope.applyDirtiedAnimation(animation);
return animation;
}
};
var _now = undefined;
if (WEB_ANIMATIONS_TESTING) {
var now = function() { return timeline.currentTime; };
} else {
var now = function() {
if (_now == undefined)
_now = window.performance && performance.now ? performance.now() : Date.now();
return _now;
};
}
var ticking = false;
var hasRestartedThisFrame = false;
scope.restart = function() {
if (!ticking) {
ticking = true;
requestAnimationFrame(function() {});
hasRestartedThisFrame = true;
}
return hasRestartedThisFrame;
};
// RAF is supposed to be the last script to occur before frame rendering but not
// all browsers behave like this. This function is for synchonously updating an
// animation's effects whenever its state is mutated by script to work around
// incorrect script execution ordering by the browser.
scope.applyDirtiedAnimation = function(animation) {
if (inTick) {
return;
}
animation._markTarget();
var animations = animation._targetAnimations();
animations.sort(compareAnimations);
var inactiveAnimations = tick(scope.timeline.currentTime, false, animations.slice())[1];
inactiveAnimations.forEach(function(animation) {
var index = timeline._animations.indexOf(animation);
if (index !== -1) {
timeline._animations.splice(index, 1);
}
});
applyPendingEffects();
};
var pendingEffects = [];
function applyPendingEffects() {
pendingEffects.forEach(function(f) { f(); });
pendingEffects.length = 0;
}
var t60hz = 1000 / 60;
var inTick = false;
function tick(t, isAnimationFrame, updatingAnimations) {
inTick = true;
hasRestartedThisFrame = false;
var timeline = scope.timeline;
timeline.currentTime = t;
ticking = false;
var newPendingClears = [];
var newPendingEffects = [];
var activeAnimations = [];
var inactiveAnimations = [];
updatingAnimations.forEach(function(animation) {
animation._tick(t, isAnimationFrame);
if (!animation._inEffect) {
newPendingClears.push(animation._effect);
animation._unmarkTarget();
} else {
newPendingEffects.push(animation._effect);
animation._markTarget();
}
if (animation._needsTick)
ticking = true;
var alive = animation._inEffect || animation._needsTick;
animation._inTimeline = alive;
if (alive) {
activeAnimations.push(animation);
} else {
inactiveAnimations.push(animation);
}
});
// FIXME: Should remove dupliactes from pendingEffects.
pendingEffects.push.apply(pendingEffects, newPendingClears);
pendingEffects.push.apply(pendingEffects, newPendingEffects);
if (ticking)
requestAnimationFrame(function() {});
inTick = false;
return [activeAnimations, inactiveAnimations];
};
if (WEB_ANIMATIONS_TESTING) {
testing.tick = function(t) { timeline.currentTime = t; processRafCallbacks(t); };
testing.isTicking = function() { return ticking; };
testing.setTicking = function(newVal) { ticking = newVal; };
}
var timeline = new InternalTimeline();
scope.timeline = timeline;
})(webAnimationsShared, webAnimations1, webAnimationsTesting);
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