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タッチイベントを拾ってDraggableモドキ

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jQuery UIのDraggableだとiPhoneだとかのタッチデバイスでドラッグできない。
しょぼーん…

いろいろ調べてみたら、touchstart, touchmove, touchendってのでタッチイベントが拾えるらしい。

ということで書いてみた。

touchtest.html
<!DOCTYPE html>
<html lang="ja">
<head>
	<meta charset="utf-8">
	<title>touch test</title>
	<style type="text/css">
	.touchable {
		position: absolute;
		cursor: move;
		width: 100px;
		height: 100px;
		background-color: blue;	}
	</style>
</head>
<body>
	<div class="touchable"></div>

	<script src="http://code.jquery.com/jquery-1.11.0.min.js"></script>

	<script>
	'use strict';

	$('.touchable').bind({
		'touchstart mousedown': function (e) {
			e.preventDefault();

			var eventPos = {};
			if (e.type == 'touchstart') {
				eventPos = {
					x: e.originalEvent.changedTouches[0].pageX,
					y: e.originalEvent.changedTouches[0].pageY
				};
			} else {
				eventPos = { x: e.pageX, y: e.pageY };
			}

			this.initialTouchPos = eventPos;
			this.initialDocPos = $(this).position();
			this.touching = true;
		},
		'touchmove mousemove': function (e) {
			if (!this.touching) return;
			e.preventDefault();

			var eventPos;
			if (e.type == 'touchmove') {
				eventPos = {
					x: e.originalEvent.changedTouches[0].pageX,
					y: e.originalEvent.changedTouches[0].pageY
				};
			} else {
				eventPos = { x: e.pageX, y: e.pageY };
			}

			var left = this.initialDocPos.left
					+ (eventPos.x - this.initialTouchPos.x);
			var top = this.initialDocPos.top
					+ (eventPos.y - this.initialTouchPos.y);

			$(this).css({ left: left, top: top });
		},
		'touchend mouseup': function (e) {
			if (!this.touching) return;
			this.touching = false;
			delete this.touching;
			delete this.initialTouchPos;
			delete this.initialDocPos;
		}
	});
	</script>
</body>
</html>

touchstart時点の座標を覚えておいて、touchmoveが発生毎に、開始時の座標との差分をターゲットドキュメントの座標に加えてあげるだけ。thisに勝手なプロパティ追加したので最後に一応お掃除deleteしてみました。(しなくてもいいのかな?良くわかんない)

タッチイベント発生時の座標は、e.originalEvent.changedTouches[0]から引っ張ってこないといけないみたい。

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