OLD | NEW |
---|---|
(Empty) | |
1 // Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file | |
2 // for details. All rights reserved. Use of this source code is governed by a | |
3 // BSD-style license that can be found in the LICENSE file. | |
4 | |
5 part of html; | |
6 | |
7 /** | |
8 * Adapter for exposing DOM events as Dart streams. | |
9 */ | |
10 class _HtmlStreamController<T extends Event> extends StreamController<T> { | |
Jennifer Messerly
2013/01/11 21:57:17
High level question: do we want to subclass Stream
floitsch
2013/01/11 22:46:11
If I'm not wrong we can directly forward the regis
blois
2013/01/11 22:51:30
Will take a look at this now.
Jennifer Messerly
2013/01/11 23:30:14
I hope it works -- that would be awesome :)
| |
11 final EventTarget _target; | |
12 final String _eventType; | |
13 final bool _useCapture; | |
14 EventListener _eventHandler; | |
15 | |
16 _HtmlStreamController(this._target, this._eventType, this._useCapture) { | |
17 // Stash reference to the method to allow removeEventListener to function. | |
18 _eventHandler = _handleEvent; | |
Jennifer Messerly
2013/01/11 21:57:17
Can this just be:
_eventHandler = this.add;
blois
2013/01/11 22:51:30
Unfortunately, this fails in dart2js checked mode.
| |
19 } | |
20 | |
21 void onSubscriptionStateChange() { | |
22 super.onSubscriptionStateChange(); | |
23 if (hasSubscribers) { | |
24 _target.$dom_addEventListener(_eventType, _eventHandler, _useCapture); | |
25 } else { | |
26 _target.$dom_removeEventListener(_eventType, _eventHandler, _useCapture); | |
27 } | |
28 } | |
29 | |
30 void _handleEvent(e) { | |
31 this.add(e); | |
32 } | |
33 } | |
34 | |
35 | |
36 /** | |
37 * A factory to expose DOM events as Streams. | |
38 */ | |
39 class HtmlStreamProvider<T extends Event> { | |
40 final String _eventType; | |
41 | |
42 const HtmlStreamProvider(this._eventType); | |
43 | |
44 /** | |
45 * Gets a [Stream] for this event type, on the specified target. | |
46 * | |
47 * This may be used to capture DOM events: | |
48 * | |
49 * Element.keyDownEvent.forTarget(element, useCapture: true).listen(...); | |
50 * | |
51 * Or for listening to an event which will bubble through the DOM tree: | |
52 * | |
53 * MediaElement.pauseEvent.forTarget(document.body).listen(...); | |
54 * | |
55 * See also: | |
56 * | |
57 * [addEventListener](http://docs.webplatform.org/wiki/dom/methods/addEventLis tener) | |
58 */ | |
59 Stream<T> forTarget(EventTarget e, {bool useCapture: false}) { | |
60 return new _HtmlStreamController(e, _eventType, useCapture); | |
61 } | |
62 } | |
OLD | NEW |