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| 1 // | |
| 2 // Copyright 2014 Google Inc. All rights reserved. | |
| 3 // | |
| 4 // Use of this source code is governed by a BSD-style | |
| 5 // license that can be found in the LICENSE file or at | |
| 6 // https://developers.google.com/open-source/licenses/bsd | |
| 7 // | |
| 8 | |
| 9 /// A [window.requestAnimationFrame] based timer for use with transitions. | |
| 10 /// Uses [dart.async.Timer] when the time until next timeout is too long. | |
| 11 library charted.core.timer; | |
| 12 | |
| 13 import 'dart:async'; | |
| 14 import 'dart:html' show window; | |
| 15 import 'dart:collection'; | |
| 16 | |
| 17 typedef bool TimerCallback(int time); | |
| 18 | |
| 19 class AnimationTimer extends LinkedListEntry { | |
| 20 static LinkedList<AnimationTimer> _queue = new LinkedList<AnimationTimer>(); | |
| 21 | |
| 22 /// true if we are already waiting for window.animationFrame. At any given | |
| 23 /// time, only one of _timerScheduled and _animationFrameRequested are set | |
| 24 static bool _animationFrameRequested = false; | |
| 25 | |
| 26 /// Instance of currently scheduled timer. At any given time, only one | |
| 27 /// of _timerScheduled and _animationFrameRequested are set. | |
| 28 static Timer _timerScheduled; | |
| 29 | |
| 30 /// Currently active timer. | |
| 31 static AnimationTimer active; | |
| 32 | |
| 33 /// Callback function that is called when the timer is fired. | |
| 34 final TimerCallback callback; | |
| 35 | |
| 36 /// Start time of the animation. | |
| 37 final int time; | |
| 38 | |
| 39 /// Schedule a new [callback] to be called [delay] micro-seconds after | |
| 40 /// [then] micro-seconds since epoch. | |
| 41 AnimationTimer(this.callback, { int delay: 0, int then: null }) | |
| 42 : time = then == null | |
| 43 ? new DateTime.now().millisecondsSinceEpoch + delay | |
| 44 : then + delay { | |
| 45 _queue.add(this); | |
| 46 if (!_animationFrameRequested) { | |
| 47 if (_timerScheduled != null) { | |
| 48 _timerScheduled.cancel(); | |
| 49 } | |
| 50 _animationFrameRequested = true; | |
| 51 window.animationFrame.then(_step); | |
| 52 } | |
| 53 } | |
| 54 | |
| 55 /// Iterate through all timers, call the callbacks where necessary and | |
| 56 /// return milliseconds until next timer. | |
| 57 static int flush() { | |
| 58 int now = new DateTime.now().millisecondsSinceEpoch; | |
| 59 int earliest = null; | |
| 60 AnimationTimer timer = _queue.isEmpty ? null : _queue.first; | |
| 61 | |
| 62 while(timer != null) { | |
| 63 bool finished = false; | |
| 64 AnimationTimer ref = timer; | |
| 65 | |
| 66 if (now > timer.time) { | |
| 67 active = timer; | |
| 68 finished = timer.callback(now - timer.time); | |
| 69 } | |
| 70 if (!finished && (earliest == null || timer.time < earliest)) { | |
| 71 earliest = timer.time; | |
| 72 } | |
| 73 timer = timer.next; | |
| 74 if (finished) ref.unlink(); | |
| 75 } | |
| 76 active = null; | |
| 77 return earliest == null ? earliest : earliest - now; | |
| 78 } | |
| 79 | |
| 80 /// Internal timer and animation frame handler. | |
| 81 _step([_]) { | |
| 82 int delay = flush(); | |
| 83 | |
| 84 if (delay == null) { | |
| 85 _animationFrameRequested = false; | |
| 86 } | |
| 87 else if (delay > 24) { | |
| 88 if (_timerScheduled != null) { | |
| 89 _timerScheduled.cancel(); | |
| 90 } | |
| 91 _timerScheduled = new Timer(new Duration(milliseconds: delay), _step); | |
| 92 _animationFrameRequested = false; | |
| 93 } | |
| 94 else { | |
| 95 _animationFrameRequested = true; | |
| 96 window.animationFrame.then(_step); | |
| 97 } | |
| 98 } | |
| 99 } | |
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Chromium Code Reviews
Issue 1400473008:
Roll Observatory packages and add a roll script (Closed)
Base URL: git@github.com:dart-lang/observatory_pub_packages.git@master