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6eba4a04f9
We'll eventually turn this into a full fn2 component, but for now it's just an example. To make this work, I created a schedule.dart as a start to implementing scheduler.md. For now, I've kept the API similar to the web platform so that the old world can continue use it backed by sky.window.requestAnimationFrame. R=eseidel@chromium.org BUG= Review URL: https://codereview.chromium.org/1145973009
62 lines
1.5 KiB
Dart
62 lines
1.5 KiB
Dart
// Copyright 2015 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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import 'dart:async';
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import 'dart:sky' as sky;
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typedef void Callback(double timeStamp);
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bool _haveScheduledVisualUpdate = false;
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int _nextCallbackId = 1;
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final List<Callback> _persistentCallbacks = new List<Callback>();
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Map<int, Callback> _transientCallbacks = new Map<int, Callback>();
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void _beginFrame(double timeStamp) {
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_haveScheduledVisualUpdate = false;
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Map<int, Callback> callbacks = _transientCallbacks;
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_transientCallbacks = new Map<int, Callback>();
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callbacks.forEach((id, callback) {
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callback(timeStamp);
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});
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for (Callback callback in _persistentCallbacks)
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callback(timeStamp);
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}
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void init() {
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assert(sky.window == null);
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sky.view.setBeginFrameCallback(_beginFrame);
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}
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void addPersistentFrameCallback(Callback callback) {
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assert(sky.window == null);
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_persistentCallbacks.add(callback);
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}
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int requestAnimationFrame(Callback callback) {
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if (sky.window != null)
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return sky.window.requestAnimationFrame(callback);
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int id = _nextCallbackId++;
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_transientCallbacks[id] = callback;
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ensureVisualUpdate();
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return id;
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}
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void cancelAnimationFrame(int id) {
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if (sky.window != null)
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return sky.window.cancelAnimationFrame(id);
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_transientCallbacks.remove(id);
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}
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void ensureVisualUpdate() {
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assert(sky.window == null);
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if (_haveScheduledVisualUpdate)
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return;
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sky.view.scheduleFrame();
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_haveScheduledVisualUpdate = true;
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}
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