如何使用被动事件流同时处理鼠标和触摸事件 [英] How to handle mouse and touch events simultaneously with reactive event streams
问题描述
我正在构建一个音频播放控件,让用户可以在音频文件中来回滚动。它需要处理触摸和鼠标事件。我应该如何使用被动事件流管理事件呢?
I'm building an audio playback control that lets users scrub back and forth through an audio file. It needs to work with touch and mouse events. How should I go about managing the events for this with reactive event streams?
这里有一个关于如何构建它的粗略概念。
Here's a rough idea of how I would expect to build it.
<div id="timeline">
<span id="scrubber"></span>
</div>
然后,使用Bacon.js创建事件流
then, using Bacon.js to create event streams
var mousedowns = $('#timeline').asEventStream('mousedown');
var touchstarts = $('#timeline').asEventStream('touchstart');
var starts = Bacon.mergeAll(mousedowns, touchstarts);
var mousemoves = $('#timeline').asEventStream('mousemove');
var touchmoves = $('#timeline').asEventStream('touchmove');
var moves = Bacon.mergeAll(mousemoves, touchmoves);
var mouseups = $('#timeline').asEventStream('mouseup');
var touchends = $('#timeline').asEventStream('touchend');
var ends = Bacon.mergeAll(mouseups, touchends);
starts.onValue(function () {
var repositionScrubber = moves.onValue(function (ev) {
$('#scrubber').moveTo(ev.offsetX);
});
ends.onValue(function () {
repositionScrubber.stop();
});
});
我确定这是各种各样的错误,但我真的很擅长处理带有可观察事件的事件溪流,我还不知道有什么好的食谱。任何帮助将不胜感激!
I'm sure that's all sorts of wrong, but I'm really new to handling events with observable streams and I don't know of any good cookbooks for it yet. Any help will be appreciated!
推荐答案
这基本上是规范拖放配方。
RxJS中的最小工作示例是像这样:
The minimum working example in RxJS is something like this:
var $timeline = $('#timeline');
var $scrubber = $('#scrubber');
var mouseDown = Rx.Observable.merge(
Rx.Observable.fromEvent($timeline, 'mousedown'),
Rx.Observable.fromEvent($timeline, 'touchstart'));
var mouseUp = Rx.Observable.merge(
Rx.Observable.fromEvent($timeline, 'mouseup'),
Rx.Observable.fromEvent($timeline, 'touchend'));
var mouseMove = Rx.Observable.merge(
Rx.Observable.fromEvent($timeline, 'mousemove'),
Rx.Observable.fromEvent($timeline, 'touchmove'));
var subscription = mouseDown.flatMapLatest(function(md) {
// calculate offsets when mouse down
var startX = md.offsetX;
return mouseMove.takeUntil(mouseUp)
.map(function(mm) {
mm.preventDefault();
return {
left: mm.clientX - startX,
};
});
})
.subscribe(function(e) {
$scrubber.css(e);
});
var $timeline = $('#timeline');
var $scrubber = $('#scrubber');
var mouseDown = Rx.Observable.merge(
Rx.Observable.fromEvent($timeline, 'mousedown'),
Rx.Observable.fromEvent($timeline, 'touchstart'));
var mouseUp = Rx.Observable.merge(
Rx.Observable.fromEvent($timeline, 'mouseup'),
Rx.Observable.fromEvent($timeline, 'touchend'));
var mouseMove = Rx.Observable.merge(
Rx.Observable.fromEvent($timeline, 'mousemove'),
Rx.Observable.fromEvent($timeline, 'touchmove'));
var subscription = mouseDown.flatMapLatest(function(md) {
// calculate offsets when mouse down
var startX = md.offsetX;
return mouseMove.takeUntil(mouseUp)
.map(function(mm) {
mm.preventDefault();
return {
left: mm.clientX - startX,
};
});
})
.subscribe(function(e) {
$scrubber.css(e);
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/rxjs/2.5.3/rx.all.js"></script>
<div id="timeline" style="height: 100px; width: 100px; background: yellow; position: absolute;">
<span id="scrubber" style="height: 20px; width: 30px; background: green; position: relative;">Foo</span>
</div>
这篇关于如何使用被动事件流同时处理鼠标和触摸事件的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!