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b017dfd995
NOTE: This CL appears far larger than it actually is for two reasons: 1) Many files were moved around to use the Dart package directory structure. 2) Many .dart files had to have import paths updated. - Organize mojo/public/dart so that it uses standard Dart package layout - Organize mojo/dart/apptest so that it uses a standard Dart package layout - Organize sky/sdk so that it uses a standard Dart package layout - Create a mojo/testing package (used by unittests) - Introduce the 'dart_pkg' gn rule which populates gen/Config/dart-pkg - All internally vended Dart packages must have a corresponding dart_pkg rule - It is now possible to use dependency_overrides: in pubspec.yaml to mix internal and external package dependencies (enables analyzer, editor, webstorm usage for internal developers). - Package root for dart content handler ends with "packages/" - Imports of mojo package uris no longer need the "public/dart" - mojo/public/tools/dart_package.py is a clone of mojo/public/tools/gn/zip.py - Sky tests no longer run 'deploy_sdk' script. R=eseidel@chromium.org Review URL: https://codereview.chromium.org/1132063007
52 lines
1.2 KiB
Dart
52 lines
1.2 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:math" as math;
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import "dart:sky" as sky;
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abstract class AnimationDelegate {
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void updateAnimation(double t);
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}
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class AnimationTimer {
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final AnimationDelegate _delegate;
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double _startTime = 0.0;
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double _duration = 0.0;
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int _animationId = 0;
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AnimationTimer(this._delegate);
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void start(double duration) {
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if (_animationId != 0)
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stop();
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_duration = duration;
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_scheduleTick();
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}
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void stop() {
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sky.window.cancelAnimationFrame(_animationId);
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_startTime = 0.0;
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_duration = 0.0;
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_animationId = 0;
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}
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void _scheduleTick() {
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assert(_animationId == 0);
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_animationId = sky.window.requestAnimationFrame(_tick);
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}
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void _tick(double timeStamp) {
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_animationId = 0;
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if (_startTime == 0.0)
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_startTime = timeStamp;
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double elapsedTime = timeStamp - _startTime;
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double t = math.max(0.0, math.min(1.0, elapsedTime / _duration));
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if (t < 1.0)
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_scheduleTick();
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else
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stop();
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_delegate.updateAnimation(t);
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}
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}
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