samples-dev/swarm/swarm_ui_lib/base/Env.dart

// Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

part of base;

/// This class has static fields that hold objects that this isolate
/// uses to interact with the environment.  Which objects are available
/// depend on how the isolate was started.  In the UI isolate
/// of the browser, the window object is available.
class Env {
  static final AnimationScheduler _animationScheduler = AnimationScheduler();

  /// Provides functionality similar to [:window.requestAnimationFrame:] for
  /// all platforms. [callback] is executed on the next animation frame that
  /// occurs at or after [minTime].  If [minTime] is not specified, the first
  /// available animation frame is used.  Returns an id that can be used to
  /// cancel the pending callback.
  static int requestAnimationFrame(AnimationCallback callback,
      [Element? element, num? minTime]) {
    return _animationScheduler.requestAnimationFrame(
        callback, element, minTime);
  }

  /// Cancel the pending callback callback matching the specified [id].
  static void cancelRequestAnimationFrame(int id) {
    _animationScheduler.cancelRequestAnimationFrame(id);
  }
}

typedef XMLHttpRequestCompleted = void Function(HttpRequest req);