| // Copyright (c) 2013, 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 |
| |
| // @dart = 2.9 |
| |
| library transition_event_test; |
| |
| import 'dart:html'; |
| import 'dart:async'; |
| |
| import 'package:expect/minitest.dart'; |
| |
| Future testTransitionEnd() async { |
| var element = new DivElement(); |
| document.body.append(element); |
| |
| element.style.opacity = '0'; |
| element.style.width = '100px'; |
| element.style.height = '100px'; |
| element.style.background = 'red'; |
| element.style.transition = 'opacity .1s'; |
| |
| final done = new Completer(); |
| |
| new Timer(const Duration(milliseconds: 100), () { |
| element.onTransitionEnd.first.then((e) { |
| expect(e is TransitionEvent, isTrue); |
| expect(e.propertyName, 'opacity'); |
| }).then(done.complete, onError: done.completeError); |
| |
| element.style.opacity = '1'; |
| }); |
| |
| await done.future; |
| } |
| |
| main() async { |
| expect(CssStyleDeclaration.supportsTransitions, isTrue); |
| if (CssStyleDeclaration.supportsTransitions) { |
| await testTransitionEnd(); |
| } |
| } |