1 // Copyright 2014 Google Inc. All rights reserved. 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); 4 // you may not use this file except in compliance with the License. 5 // You may obtain a copy of the License at 6 // 7 // http://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 // See the License for the specific language governing permissions and 13 // limitations under the License. 14 (function(shared, scope, testing) { 15 16 var nullTarget = document.createElementNS('http://www.w3.org/1999/xhtml', 'div'); 17 18 var sequenceNumber = 0; 19 scope.bindPlayerForCustomEffect = function(player) { 20 var target = player.source.target; 21 var effect = player.source.effect; 22 var timing = player.source.timing; 23 var last = undefined; 24 timing = shared.normalizeTimingInput(timing); 25 var callback = function() { 26 var t = callback._player ? callback._player.currentTime : null; 27 if (t !== null) { 28 t = shared.calculateTimeFraction(shared.calculateActiveDuration(timing), t, timing); 29 if (isNaN(t)) 30 t = null; 31 } 32 // FIXME: There are actually more conditions under which the effect 33 // should be called. 34 if (t !== last) 35 effect(t, target, player.source); 36 last = t; 37 }; 38 39 callback._player = player; 40 callback._registered = false; 41 callback._sequenceNumber = sequenceNumber++; 42 player._callback = callback; 43 register(callback); 44 }; 45 46 var callbacks = []; 47 var ticking = false; 48 function register(callback) { 49 if (callback._registered) 50 return; 51 callback._registered = true; 52 callbacks.push(callback); 53 if (!ticking) { 54 ticking = true; 55 requestAnimationFrame(tick); 56 } 57 } 58 59 function tick(t) { 60 var updating = callbacks; 61 callbacks = []; 62 updating.sort(function(left, right) { 63 return left._sequenceNumber - right._sequenceNumber; 64 }); 65 updating = updating.filter(function(callback) { 66 callback(); 67 var playState = callback._player ? callback._player.playState : 'idle'; 68 if (playState != 'running' && playState != 'pending') 69 callback._registered = false; 70 return callback._registered; 71 }); 72 callbacks.push.apply(callbacks, updating); 73 74 if (callbacks.length) { 75 ticking = true; 76 requestAnimationFrame(tick); 77 } else { 78 ticking = false; 79 } 80 } 81 82 scope.Player.prototype._register = function() { 83 if (this._callback) 84 register(this._callback); 85 }; 86 87 })(webAnimationsShared, webAnimationsNext, webAnimationsTesting); 88
