移动设备手势事件库Touch.js使用详解

Touch.js手势库是专门在Webkit内核浏览器的移动设备中使用中设计的, Touch.js是移动设备上的手势识别与事件库。Touch.js基于原生事件,支持事件代理, 性能更好，极简的API,秒速上手等优势。

1、旋转事件- startRotate

var angle = 0;
touch.on('#target', 'touchstart', function(ev){
ev.startRotate();
ev.preventDefault();
});
touch.on('#target', 'rotate', function(ev){
var totalAngle = angle + ev.rotation;
if(ev.fingerStatus === 'end'){
angle = angle + ev.rotation;
}
this.style.webkitTransform = 'rotate(' + totalAngle + 'deg)';
});

2、双指缩放事件-Scale

var target = document.getElementById("target");
target.style.webkitTransition = 'all ease 0.05s';
touch.on('#target', 'touchstart', function(ev){
ev.preventDefault();
});
var initialScale = 1;
var currentScale;
touch.on('#target', 'pinchend', function(ev){
currentScale = ev.scale - 1;
currentScale = initialScale + currentScale;
currentScale = currentScale > 2 ? 2 : currentScale;
currentScale = currentScale < 1 ? 1 : currentScale;
this.style.webkitTransform = 'scale(' + currentScale + ')';
log("当前缩放比例为:" + currentScale + ".");
});
touch.on('#target', 'pinchend', function(ev){
initialScale = currentScale;
});

3、识别单击, 双击和长按事件-Tap & Hold

touch.on('#target', 'hold tap doubletap', function(ev){
//console.log(ev.type);
});

4、向左, 向右滑动-Swipe

touch.on('#target', 'touchstart', function(ev){
ev.preventDefault();
});
var target = document.getElementById("target");
target.style.webkitTransition = 'all ease 0.2s';
touch.on(target, 'swiperight', function(ev){
this.style.webkitTransform = "translate3d(" + rt + "px,0,0)";
log("向右滑动.");
});
touch.on(target, 'swipeleft', function(ev){
log("向左滑动.");
this.style.webkitTransform = "translate3d(-" + this.offsetLeft + "px,0,0)";
});

5、拖拽事件-Drag

touch.on('#target', 'touchstart', function(ev){
ev.preventDefault();
});
var target = document.getElementById("target");
var dx, dy;
touch.on('#target', 'drag', function(ev){
dx = dx || 0;
dy = dy || 0;
log("当前x值为:" + dx + ", 当前y值为:" + dy +".");
var offx = dx + ev.x + "px";
var offy = dy + ev.y + "px";
this.style.webkitTransform = "translate3d(" + offx + "," + offy + ",0)";
});
touch.on('#target', 'dragend', function(ev){
dx += ev.x;
dy += ev.y;
});

6、原生事件-Touch

touch.on('#target', 'touchstart touchmove touchend', function(ev){
console.log(ev.type);
});

touch.js官方网站：http://touch.code.baidu.com/

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