touch.js 拖动缩放旋转 (鼠标手势)
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可以实现手势操作:拖动、缩放、旋转。封装好的脚本方法是这样的:
var cat = window.cat || {}; cat.touchjs = { left: 0, top: 0, scaleVal: 1, //缩放 rotateVal: 0, //旋转 curStatus: 0, //记录当前手势的状态, 0:拖动, 1:缩放, 2:旋转 //初始化 init: function ($targetObj, callback) { touch.on($targetObj, \'touchstart\', function (ev) { cat.touchjs.curStatus = 0; ev.preventDefault();//阻止默认事件 }); if (!window.localStorage.cat_touchjs_data) callback(0, 0, 1, 0); else { var jsonObj = JSON.parse(window.localStorage.cat_touchjs_data); cat.touchjs.left = parseFloat(jsonObj.left), cat.touchjs.top = parseFloat(jsonObj.top), cat.touchjs.scaleVal = parseFloat(jsonObj.scale), cat.touchjs.rotateVal = parseFloat(jsonObj.rotate); callback(cat.touchjs.left, cat.touchjs.top, cat.touchjs.scaleVal, cat.touchjs.rotateVal); } }, //拖动 drag: function ($targetObj, callback) { touch.on($targetObj, \'drag\', function (ev) { $targetObj.css("left", cat.touchjs.left + ev.x).css("top", cat.touchjs.top + ev.y); }); touch.on($targetObj, \'dragend\', function (ev) { cat.touchjs.left = cat.touchjs.left + ev.x; cat.touchjs.top = cat.touchjs.top + ev.y; callback(cat.touchjs.left, cat.touchjs.top); }); }, //缩放 scale: function ($targetObj, callback) { var initialScale = cat.touchjs.scaleVal || 1; var currentScale; touch.on($targetObj, \'pinch\', function (ev) { if (cat.touchjs.curStatus == 2) { return; } cat.touchjs.curStatus = 1; currentScale = ev.scale - 1; currentScale = initialScale + currentScale; cat.touchjs.scaleVal = currentScale; var transformStyle = \'scale(\' + cat.touchjs.scaleVal + \') rotate(\' + cat.touchjs.rotateVal + \'deg)\'; $targetObj.css("transform", transformStyle).css("-webkit-transform", transformStyle); callback(cat.touchjs.scaleVal); }); touch.on($targetObj, \'pinchend\', function (ev) { if (cat.touchjs.curStatus == 2) { return; } initialScale = currentScale; cat.touchjs.scaleVal = currentScale; callback(cat.touchjs.scaleVal); }); }, //旋转 rotate: function ($targetObj, callback) { var angle = cat.touchjs.rotateVal || 0; touch.on($targetObj, \'rotate\', function (ev) { if (cat.touchjs.curStatus == 1) { return; } cat.touchjs.curStatus = 2; var totalAngle = angle + ev.rotation; if (ev.fingerStatus === \'end\') { angle = angle + ev.rotation; } cat.touchjs.rotateVal = totalAngle; var transformStyle = \'scale(\' + cat.touchjs.scaleVal + \') rotate(\' + cat.touchjs.rotateVal + \'deg)\'; $targetObj.css("transform", transformStyle).css("-webkit-transform", transformStyle); $targetObj.attr(\'data-rotate\', cat.touchjs.rotateVal); callback(cat.touchjs.rotateVal); }); } };
html代码:
<div style="position:relative;width: 100%;height: 250px;overflow: hidden;border: 1px dashed #ff0000;"> <img id="targetObj" style="position:relative;transform-origin:center" src="http://demo.somethingwhat.com/images/flower1.jpg" /> </div>
js调用:
var $targetObj = $(\'#targetObj\'); //初始化设置 cat.touchjs.init($targetObj, function (left, top, scale, rotate) {}; //初始化拖动手势(不需要就注释掉) cat.touchjs.drag($targetObj, function (left, top) { }); //初始化缩放手势(不需要就注释掉) cat.touchjs.scale($targetObj, function (scale) { }); //初始化旋转手势(不需要就注释掉) cat.touchjs.rotate($targetObj, function (rotate) { });
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