javascript – 如何使用被动事件流同时处理鼠标和触摸事件

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擦洗.它需要处理触摸和鼠标事件.我应该如何使用被动事件流来管理事件？

以下是我希望如何构建它的大致想法.

<div id="timeline">
  <span id="scrubber"></span>
</div>

然后,使用Bacon.js创建事件流

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具有可观察流的事件,我还不知道它有什么好的烹饪书.任何帮助将不胜感激！

解决方法

这基本上是规范的 drag and drop recipe.

RxJS中的最小工作示例是这样的：

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'),'touchend'));

var mouseMove = Rx.Observable.merge(
  Rx.Observable.fromEvent($timeline,'mousemove'),'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,'touchstart'));
    
    var mouseUp = Rx.Observable.merge(
      Rx.Observable.fromEvent($timeline,'touchend'));
    
    var mouseMove = Rx.Observable.merge(
      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>