Leaf Petersen
745f112ef6
Opt an initial batch of files under samples, samples-dev, utils, and runtime/tools/dartfuzz out of null safety in preparation for switching the flag on by default. Change-Id: Icdfd52a5a969e678a7205903332f73fe3841c223 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/166960 Reviewed-by: Daco Harkes <dacoharkes@google.com> Commit-Queue: Leaf Petersen <leafp@google.com>
43 lines
1.5 KiB
Dart
43 lines
1.5 KiB
Dart
// Copyright (c) 2011, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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// @dart = 2.9
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part of base;
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/**
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* This class has static fields that hold objects that this isolate
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* uses to interact with the environment. Which objects are available
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* depend on how the isolate was started. In the UI isolate
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* of the browser, the window object is available.
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*/
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class Env {
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static AnimationScheduler _animationScheduler;
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/**
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* Provides functionality similar to [:window.requestAnimationFrame:] for
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* all platforms. [callback] is executed on the next animation frame that
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* occurs at or after [minTime]. If [minTime] is not specified, the first
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* available animation frame is used. Returns an id that can be used to
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* cancel the pending callback.
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*/
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static int requestAnimationFrame(AnimationCallback callback,
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[Element element = null, num minTime = null]) {
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if (_animationScheduler == null) {
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_animationScheduler = new AnimationScheduler();
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}
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return _animationScheduler.requestAnimationFrame(
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callback, element, minTime);
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}
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/**
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* Cancel the pending callback callback matching the specified [id].
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*/
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static void cancelRequestAnimationFrame(int id) {
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_animationScheduler.cancelRequestAnimationFrame(id);
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}
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}
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typedef void XMLHttpRequestCompleted(HttpRequest req);
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