- 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);
- });
- }
- };
来源: