移動端 縮放插件備份
第一種javascript
<!doctype html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<meta name="viewport" content="width=device-width,initial-scale=1.0, minimum-scale=1.0, maximum-scale=1.0, user-scalable=no" />
<title>圖片縮放</title>
<link rel="stylesheet" href="themes/scale.css" type="text/css" />
</head>
<body>
<div class="list">
<img src="themes/images/2.jpg" />
</div>
<section class="imgzoom_pack">
<div class="imgzoom_x">X</div>
<div class="imgzoom_img"><img src="" /></div>
</section>
<script src="js/scale.js"></script>
<script>
document.addEventListener("DOMContentLoaded", function(event){
ImagesZoom.init({
"elem": ".list"
});
}, false);
</script>
</body>
</html>
源碼css
(function(window, undefined){
var document = window.document,
support = {
transform3d: ("WebKitCSSMatrix" in window && "m11" in new WebKitCSSMatrix()),
touch: ("ontouchstart" in window)
};
function getTranslate(x, y){
var distX = x, distY = y;
return support.transform3d ? "translate3d("+ distX +"px, "+ distY +"px, 0)" : "translate("+ distX +"px, "+ distY +"px)";
}
function getPage(event, page) {
return support.touch ? event.changedTouches[0][page] : event[page];
}
var ImagesZoom = function(){};
ImagesZoom.prototype = {
// 給初始化數據
init: function(param){
var self = this,
params = param || {};
var imgList = document.querySelectorAll(params.elem + " img"),
zoomMask = document.querySelector(".imgzoom_pack"),
zoomImg = document.querySelector(".imgzoom_pack .imgzoom_img img"),
zoomClose = document.querySelector(".imgzoom_pack .imgzoom_x"),
imgSrc = "";
self.buffMove = 3; //緩衝係數
self.buffScale = 2; //放大係數
self.finger = false; //觸摸手指的狀態 false：單手指 true：多手指
self._destroy();
zoomClose.addEventListener("click", function(){
zoomMask.style.cssText = "display:none";
zoomImg.src = "";
zoomImg.style.cssText = "";
self._destroy();
document.removeEventListener("touchmove", self.eventStop, false);
}, false);
for(var len=imgList.length,i=0; i<len; i++){
imgList[i].addEventListener("click", function(){
imgSrc = this.getAttribute("src");
zoomMask.style.cssText = "display:block";
zoomImg.src = imgSrc;
zoomImg.onload = function(){
zoomImg.style.cssText = "margin-top:-"+(zoomImg.offsetHeight/2)+"px";
// 禁止頁面滾動
document.addEventListener("touchmove", self.eventStop, false);
self.imgBaseWidth = zoomImg.offsetWidth;
self.imgBaseHeight = zoomImg.offsetHeight;
self.addEventStart({
wrapX: zoomMask.offsetWidth,
wrapY: zoomMask.offsetHeight,
mapX: zoomImg.width,
mapY: zoomImg.height
});
}
}, false);
}
},
addEventStart: function(param){
var self = this,
params = param || {};
self.element = document.querySelector(".imgzoom_pack img");
//config set
self.wrapX = params.wrapX || 0; //可視區域寬度
self.wrapY = params.wrapY || 0; //可視區域高度
self.mapX = params.mapX || 0; //地圖寬度
self.mapY = params.mapY || 0; //地圖高度
self.outDistY = (self.mapY - self.wrapY)/2; //圖片超過一屏的時候有用
self.width = self.mapX - self.wrapX; //地圖的寬度減去可視區域的寬度
self.height = self.mapY - self.wrapY; //地圖的高度減去可視區域的高度
self.element.addEventListener("touchstart",function(e){
self._touchstart(e);
},false);
self.element.addEventListener("touchmove",function(e){
self._touchmove(e);
},false);
self.element.addEventListener("touchend",function(e){
self._touchend(e);
},false);
},
// 重置座標數據
_destroy: function(){
this.distX = 0;
this.distY = 0;
this.newX = 0;
this.newY = 0;
},
// 更新地圖信息
_changeData: function(){
this.mapX = this.element.offsetWidth; //地圖寬度
this.mapY = this.element.offsetHeight; //地圖高度
// this.outDistY = (this.mapY - this.wrapY)/2; //當圖片高度超過屏幕的高度時候。圖片是垂直居中的，這時移動有個高度作爲緩衝帶
this.width = this.mapX - this.wrapX; //地圖的寬度減去可視區域的寬度
this.height = this.mapY - this.wrapY; //地圖的高度減去可視區域的高度
},
_touchstart: function(e){
var self = this;
e.preventDefault();
var touchTarget = e.targetTouches.length; //得到觸控點數
self._changeData(); //從新初始化圖片、可視區域數據，因爲放大會產生新的計算
if(touchTarget == 1){
// 獲取開始座標
self.basePageX = getPage(e, "pageX");
self.basePageY = getPage(e, "pageY");
self.finger = false;
}else{
self.finger = true;
self.startFingerDist = self.getTouchDist(e).dist;
self.startFingerX = self.getTouchDist(e).x;
self.startFingerY = self.getTouchDist(e).y;
}
console.log("pageX: "+getPage(e, "pageX"));
console.log("pageY: "+getPage(e, "pageY"));
},
_touchmove: function(e){
var self = this;
e.preventDefault();
e.stopPropagation();
console.log("event.changedTouches[0].pageY: "+event.changedTouches[0].pageY);
var touchTarget = e.targetTouches.length; //得到觸控點數
if(touchTarget == 1 && !self.finger){
self._move(e);
}
if(touchTarget>=2){
self._zoom(e);
}
},
_touchend: function(e){
var self = this;
self._changeData(); //從新計算數據
if(self.finger){
self.distX = -self.imgNewX;
self.distY = -self.imgNewY;
}
if( self.distX>0 ){
self.newX = 0;
}else if( self.distX<=0 && self.distX>=-self.width ){
self.newX = self.distX;
self.newY = self.distY;
}else if( self.distX<-self.width ){
self.newX = -self.width;
}
self.reset();
},
_move: function(e){
var self = this,
pageX = getPage(e, "pageX"), //獲取移動座標
pageY = getPage(e, "pageY");
// 禁止默認事件
// e.preventDefault();
// e.stopPropagation();
// 得到移動距離
self.distX = (pageX - self.basePageX) + self.newX;
self.distY = (pageY - self.basePageY) + self.newY;
if(self.distX > 0){
self.moveX = Math.round(self.distX/self.buffMove);
}else if( self.distX<=0 && self.distX>=-self.width ){
self.moveX = self.distX;
}else if(self.distX < -self.width ){
self.moveX = -self.width+Math.round((self.distX+self.width)/self.buffMove);
}
self.movePos();
self.finger = false;
},
// 圖片縮放
_zoom: function(e){
var self = this;
// e.preventDefault();
// e.stopPropagation();
var nowFingerDist = self.getTouchDist(e).dist, //得到當前長度
ratio = nowFingerDist / self.startFingerDist, //計算縮放比
imgWidth = Math.round(self.mapX * ratio), //計算圖片寬度
imgHeight = Math.round(self.mapY * ratio); //計算圖片高度
// 計算圖片新的座標
self.imgNewX = Math.round(self.startFingerX * ratio - self.startFingerX - self.newX * ratio);
self.imgNewY = Math.round((self.startFingerY * ratio - self.startFingerY)/2 - self.newY * ratio);
if(imgWidth >= self.imgBaseWidth){
self.element.style.width = imgWidth + "px";
self.refresh(-self.imgNewX, -self.imgNewY, "0s", "ease");
self.finger = true;
}else{
if(imgWidth < self.imgBaseWidth){
self.element.style.width = self.imgBaseWidth + "px";
}
}
self.finger = true;
},
// 移動座標
movePos: function(){
var self = this;
if(self.height<0){
if(self.element.offsetWidth == self.imgBaseWidth){
self.moveY = Math.round(self.distY/self.buffMove);
}else{
var moveTop = Math.round((self.element.offsetHeight-self.imgBaseHeight)/2);
self.moveY = -moveTop + Math.round((self.distY + moveTop)/self.buffMove);
}
}else{
var a = Math.round((self.wrapY - self.imgBaseHeight)/2),
b = self.element.offsetHeight - self.wrapY + Math.round(self.wrapY - self.imgBaseHeight)/2;
if(self.distY >= -a){
self.moveY = Math.round((self.distY + a)/self.buffMove) - a;
}else if(self.distY <= -b){
self.moveY = Math.round((self.distY + b)/self.buffMove) - b;
}else{
self.moveY = self.distY;
}
}
self.refresh(self.moveX, self.moveY, "0s", "ease");
},
// 重置數據
reset: function(){
var self = this,
hideTime = ".2s";
if(self.height<0){
self.newY = -Math.round(self.element.offsetHeight - self.imgBaseHeight)/2;
}else{
var a = Math.round((self.wrapY - self.imgBaseHeight)/2),
b = self.element.offsetHeight - self.wrapY + Math.round(self.wrapY - self.imgBaseHeight)/2;
if(self.distY >= -a){
self.newY = -a;
}else if(self.distY <= -b){
self.newY = -b;
}else{
self.newY = self.distY;
}
}
self.refresh(self.newX, self.newY, hideTime, "ease-in-out");
},
// 執行圖片移動
refresh: function(x, y, timer, type){
this.element.style.webkitTransitionProperty = "-webkit-transform";
this.element.style.webkitTransitionDuration = timer;
this.element.style.webkitTransitionTimingFunction = type;
this.element.style.webkitTransform = getTranslate(x, y);
},
// 獲取多點觸控
getTouchDist: function(e){
var x1 = 0,
y1 = 0,
x2 = 0,
y2 = 0,
x3 = 0,
y3 = 0,
result = {};
x1 = e.touches[0].pageX;
x2 = e.touches[1].pageX;
y1 = e.touches[0].pageY - document.body.scrollTop;
y2 = e.touches[1].pageY - document.body.scrollTop;
if(!x1 || !x2) return;
if(x1<=x2){
x3 = (x2-x1)/2+x1;
}else{
x3 = (x1-x2)/2+x2;
}
if(y1<=y2){
y3 = (y2-y1)/2+y1;
}else{
y3 = (y1-y2)/2+y2;
}
result = {
dist: Math.round(Math.sqrt(Math.pow(x1-x2,2)+Math.pow(y1-y2,2))),
x: Math.round(x3),
y: Math.round(y3)
};
return result;
},
eventStop: function(e){
e.preventDefault();
e.stopPropagation();
}
};
window.ImagesZoom = new ImagesZoom();
})(this);
另外一種html
pinchzoom.jsjava
/*
Copyright (c) Manuel Stofer 2013 - rtp.ch - RTP.PinchZoom.js
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
*/
/*global jQuery, console, define, setTimeout, window*/
(function () {
'use strict';
var definePinchZoom = function ($) {
/**
* Pinch zoom using jQuery
* @version 0.0.2
* @author Manuel Stofer <mst@rtp.ch>
* @param el
* @param options
* @constructor
*/
var PinchZoom = function (el, options) {
this.el = $(el);
this.zoomFactor = 1;
this.lastScale = 1;
this.offset = {
x: 0,
y: 0
};
this.options = $.extend({}, this.defaults, options);
this.setupMarkup();
this.bindEvents();
this.update();
// default enable.
this.enable();
},
sum = function (a, b) {
return a + b;
},
isCloseTo = function (value, expected) {
return value > expected - 0.01 && value < expected + 0.01;
};
PinchZoom.prototype = {
defaults: {
tapZoomFactor: 2,
zoomOutFactor: 1.3,
animationDuration: 300,
maxZoom: 4,
minZoom: 0.5,
lockDragAxis: false,
use2d: true,
zoomStartEventName: 'pz_zoomstart',
zoomEndEventName: 'pz_zoomend',
dragStartEventName: 'pz_dragstart',
dragEndEventName: 'pz_dragend',
doubleTapEventName: 'pz_doubletap'
},
/**
* Event handler for 'dragstart'
* @param event
*/
handleDragStart: function (event) {
this.el.trigger(this.options.dragStartEventName);
this.stopAnimation();
this.lastDragPosition = false;
this.hasInteraction = true;
this.handleDrag(event);
},
/**
* Event handler for 'drag'
* @param event
*/
handleDrag: function (event) {
if (this.zoomFactor > 1.0) {
var touch = this.getTouches(event)[0];
this.drag(touch, this.lastDragPosition);
this.offset = this.sanitizeOffset(this.offset);
this.lastDragPosition = touch;
}
},
handleDragEnd: function () {
this.el.trigger(this.options.dragEndEventName);
this.end();
},
/**
* Event handler for 'zoomstart'
* @param event
*/
handleZoomStart: function (event) {
this.el.trigger(this.options.zoomStartEventName);
this.stopAnimation();
this.lastScale = 1;
this.nthZoom = 0;
this.lastZoomCenter = false;
this.hasInteraction = true;
},
/**
* Event handler for 'zoom'
* @param event
*/
handleZoom: function (event, newScale) {
// a relative scale factor is used
var touchCenter = this.getTouchCenter(this.getTouches(event)),
scale = newScale / this.lastScale;
this.lastScale = newScale;
// the first touch events are thrown away since they are not precise
this.nthZoom += 1;
if (this.nthZoom > 3) {
this.scale(scale, touchCenter);
this.drag(touchCenter, this.lastZoomCenter);
}
this.lastZoomCenter = touchCenter;
},
handleZoomEnd: function () {
this.el.trigger(this.options.zoomEndEventName);
this.end();
},
/**
* Event handler for 'doubletap'
* @param event
*/
handleDoubleTap: function (event) {
var center = this.getTouches(event)[0],
zoomFactor = this.zoomFactor > 1 ? 1 : this.options.tapZoomFactor,
startZoomFactor = this.zoomFactor,
updateProgress = (function (progress) {
this.scaleTo(startZoomFactor + progress * (zoomFactor - startZoomFactor), center);
}).bind(this);
if (this.hasInteraction) {
return;
}
if (startZoomFactor > zoomFactor) {
center = this.getCurrentZoomCenter();
}
this.animate(this.options.animationDuration, updateProgress, this.swing);
this.el.trigger(this.options.doubleTapEventName);
},
/**
* Max / min values for the offset
* @param offset
* @return {Object} the sanitized offset
*/
sanitizeOffset: function (offset) {
var maxX = (this.zoomFactor - 1) * this.getContainerX(),
maxY = (this.zoomFactor - 1) * this.getContainerY(),
maxOffsetX = Math.max(maxX, 0),
maxOffsetY = Math.max(maxY, 0),
minOffsetX = Math.min(maxX, 0),
minOffsetY = Math.min(maxY, 0);
return {
x: Math.min(Math.max(offset.x, minOffsetX), maxOffsetX),
y: Math.min(Math.max(offset.y, minOffsetY), maxOffsetY)
};
},
/**
* Scale to a specific zoom factor (not relative)
* @param zoomFactor
* @param center
*/
scaleTo: function (zoomFactor, center) {
this.scale(zoomFactor / this.zoomFactor, center);
},
/**
* Scales the element from specified center
* @param scale
* @param center
*/
scale: function (scale, center) {
scale = this.scaleZoomFactor(scale);
this.addOffset({
x: (scale - 1) * (center.x + this.offset.x),
y: (scale - 1) * (center.y + this.offset.y)
});
},
/**
* Scales the zoom factor relative to current state
* @param scale
* @return the actual scale (can differ because of max min zoom factor)
*/
scaleZoomFactor: function (scale) {
var originalZoomFactor = this.zoomFactor;
this.zoomFactor *= scale;
this.zoomFactor = Math.min(this.options.maxZoom, Math.max(this.zoomFactor, this.options.minZoom));
return this.zoomFactor / originalZoomFactor;
},
/**
* Drags the element
* @param center
* @param lastCenter
*/
drag: function (center, lastCenter) {
if (lastCenter) {
if(this.options.lockDragAxis) {
// lock scroll to position that was changed the most
if(Math.abs(center.x - lastCenter.x) > Math.abs(center.y - lastCenter.y)) {
this.addOffset({
x: -(center.x - lastCenter.x),
y: 0
});
}
else {
this.addOffset({
y: -(center.y - lastCenter.y),
x: 0
});
}
}
else {
this.addOffset({
y: -(center.y - lastCenter.y),
x: -(center.x - lastCenter.x)
});
}
}
},
/**
* Calculates the touch center of multiple touches
* @param touches
* @return {Object}
*/
getTouchCenter: function (touches) {
return this.getVectorAvg(touches);
},
/**
* Calculates the average of multiple vectors (x, y values)
*/
getVectorAvg: function (vectors) {
return {
x: vectors.map(function (v) { return v.x; }).reduce(sum) / vectors.length,
y: vectors.map(function (v) { return v.y; }).reduce(sum) / vectors.length
};
},
/**
* Adds an offset
* @param offset the offset to add
* @return return true when the offset change was accepted
*/
addOffset: function (offset) {
this.offset = {
x: this.offset.x + offset.x,
y: this.offset.y + offset.y
};
},
sanitize: function () {
if (this.zoomFactor < this.options.zoomOutFactor) {
this.zoomOutAnimation();
} else if (this.isInsaneOffset(this.offset)) {
this.sanitizeOffsetAnimation();
}
},
/**
* Checks if the offset is ok with the current zoom factor
* @param offset
* @return {Boolean}
*/
isInsaneOffset: function (offset) {
var sanitizedOffset = this.sanitizeOffset(offset);
return sanitizedOffset.x !== offset.x ||
sanitizedOffset.y !== offset.y;
},
/**
* Creates an animation moving to a sane offset
*/
sanitizeOffsetAnimation: function () {
var targetOffset = this.sanitizeOffset(this.offset),
startOffset = {
x: this.offset.x,
y: this.offset.y
},
updateProgress = (function (progress) {
this.offset.x = startOffset.x + progress * (targetOffset.x - startOffset.x);
this.offset.y = startOffset.y + progress * (targetOffset.y - startOffset.y);
this.update();
}).bind(this);
this.animate(
this.options.animationDuration,
updateProgress,
this.swing
);
},
/**
* Zooms back to the original position,
* (no offset and zoom factor 1)
*/
zoomOutAnimation: function () {
var startZoomFactor = this.zoomFactor,
zoomFactor = 1,
center = this.getCurrentZoomCenter(),
updateProgress = (function (progress) {
this.scaleTo(startZoomFactor + progress * (zoomFactor - startZoomFactor), center);
}).bind(this);
this.animate(
this.options.animationDuration,
updateProgress,
this.swing
);
},
/**
* Updates the aspect ratio
*/
updateAspectRatio: function () {
this.setContainerY(this.getContainerX() / this.getAspectRatio());
},
/**
* Calculates the initial zoom factor (for the element to fit into the container)
* @return the initial zoom factor
*/
getInitialZoomFactor: function () {
// use .offsetWidth instead of width()
// because jQuery-width() return the original width but Zepto-width() will calculate width with transform.
// the same as .height()
return this.container[0].offsetWidth / this.el[0].offsetWidth;
},
/**
* Calculates the aspect ratio of the element
* @return the aspect ratio
*/
getAspectRatio: function () {
return this.el[0].offsetWidth / this.el[0].offsetHeight;
},
/**
* Calculates the virtual zoom center for the current offset and zoom factor
* (used for reverse zoom)
* @return {Object} the current zoom center
*/
getCurrentZoomCenter: function () {
// uses following formula to calculate the zoom center x value
// offset_left / offset_right = zoomcenter_x / (container_x - zoomcenter_x)
var length = this.container[0].offsetWidth * this.zoomFactor,
offsetLeft = this.offset.x,
offsetRight = length - offsetLeft -this.container[0].offsetWidth,
widthOffsetRatio = offsetLeft / offsetRight,
centerX = widthOffsetRatio * this.container[0].offsetWidth / (widthOffsetRatio + 1),
// the same for the zoomcenter y
height = this.container[0].offsetHeight * this.zoomFactor,
offsetTop = this.offset.y,
offsetBottom = height - offsetTop - this.container[0].offsetHeight,
heightOffsetRatio = offsetTop / offsetBottom,
centerY = heightOffsetRatio * this.container[0].offsetHeight / (heightOffsetRatio + 1);
// prevents division by zero
if (offsetRight === 0) { centerX = this.container[0].offsetWidth; }
if (offsetBottom === 0) { centerY = this.container[0].offsetHeight; }
return {
x: centerX,
y: centerY
};
},
canDrag: function () {
return !isCloseTo(this.zoomFactor, 1);
},
/**
* Returns the touches of an event relative to the container offset
* @param event
* @return array touches
*/
getTouches: function (event) {
var position = this.container.offset();
return Array.prototype.slice.call(event.touches).map(function (touch) {
return {
x: touch.pageX - position.left,
y: touch.pageY - position.top
};
});
},
/**
* Animation loop
* does not support simultaneous animations
* @param duration
* @param framefn
* @param timefn
* @param callback
*/
animate: function (duration, framefn, timefn, callback) {
var startTime = new Date().getTime(),
renderFrame = (function () {
if (!this.inAnimation) { return; }
var frameTime = new Date().getTime() - startTime,
progress = frameTime / duration;
if (frameTime >= duration) {
framefn(1);
if (callback) {
callback();
}
this.update();
this.stopAnimation();
this.update();
} else {
if (timefn) {
progress = timefn(progress);
}
framefn(progress);
this.update();
requestAnimationFrame(renderFrame);
}
}).bind(this);
this.inAnimation = true;
requestAnimationFrame(renderFrame);
},
/**
* Stops the animation
*/
stopAnimation: function () {
this.inAnimation = false;
},
/**
* Swing timing function for animations
* @param p
* @return {Number}
*/
swing: function (p) {
return -Math.cos(p * Math.PI) / 2 + 0.5;
},
getContainerX: function () {
return this.container[0].offsetWidth;
},
getContainerY: function () {
return this.container[0].offsetHeight;
},
setContainerY: function (y) {
return this.container.height(y);
},
/**
* Creates the expected html structure
*/
setupMarkup: function () {
this.container = $('<div class="pinch-zoom-container"></div>');
this.el.before(this.container);
this.container.append(this.el);
this.container.css({
'overflow': 'hidden',
'position': 'relative'
});
// Zepto doesn't recognize `webkitTransform..` style
this.el.css({
'-webkit-transform-origin': '0% 0%',
'-moz-transform-origin': '0% 0%',
'-ms-transform-origin': '0% 0%',
'-o-transform-origin': '0% 0%',
'transform-origin': '0% 0%',
'position': 'absolute'
});
},
end: function () {
this.hasInteraction = false;
this.sanitize();
this.update();
},
/**
* Binds all required event listeners
*/
bindEvents: function () {
detectGestures(this.container.get(0), this);
// Zepto and jQuery both know about `on`
$(window).on('resize', this.update.bind(this));
$(this.el).find('img').on('load', this.update.bind(this));
},
/**
* Updates the css values according to the current zoom factor and offset
*/
update: function () {
if (this.updatePlaned) {
return;
}
this.updatePlaned = true;
setTimeout((function () {
this.updatePlaned = false;
this.updateAspectRatio();
var zoomFactor = this.getInitialZoomFactor() * this.zoomFactor,
offsetX = -this.offset.x / zoomFactor,
offsetY = -this.offset.y / zoomFactor,
transform3d = 'scale3d(' + zoomFactor + ', ' + zoomFactor + ',1) ' +
'translate3d(' + offsetX + 'px,' + offsetY + 'px,0px)',
transform2d = 'scale(' + zoomFactor + ', ' + zoomFactor + ') ' +
'translate(' + offsetX + 'px,' + offsetY + 'px)',
removeClone = (function () {
if (this.clone) {
this.clone.remove();
delete this.clone;
}
}).bind(this);
// Scale 3d and translate3d are faster (at least on ios)
// but they also reduce the quality.
// PinchZoom uses the 3d transformations during interactions
// after interactions it falls back to 2d transformations
if (!this.options.use2d || this.hasInteraction || this.inAnimation) {
this.is3d = true;
removeClone();
this.el.css({
'-webkit-transform': transform3d,
'-o-transform': transform2d,
'-ms-transform': transform2d,
'-moz-transform': transform2d,
'transform': transform3d
});
} else {
// When changing from 3d to 2d transform webkit has some glitches.
// To avoid this, a copy of the 3d transformed element is displayed in the
// foreground while the element is converted from 3d to 2d transform
if (this.is3d) {
this.clone = this.el.clone();
this.clone.css('pointer-events', 'none');
this.clone.appendTo(this.container);
setTimeout(removeClone, 200);
}
this.el.css({
'-webkit-transform': transform2d,
'-o-transform': transform2d,
'-ms-transform': transform2d,
'-moz-transform': transform2d,
'transform': transform2d
});
this.is3d = false;
}
}).bind(this), 0);
},
/**
* Enables event handling for gestures
*/
enable: function() {
this.enabled = true;
},
/**
* Disables event handling for gestures
*/
disable: function() {
this.enabled = false;
}
};
var detectGestures = function (el, target) {
var interaction = null,
fingers = 0,
lastTouchStart = null,
startTouches = null,
setInteraction = function (newInteraction, event) {
if (interaction !== newInteraction) {
if (interaction && !newInteraction) {
switch (interaction) {
case "zoom":
target.handleZoomEnd(event);
break;
case 'drag':
target.handleDragEnd(event);
break;
}
}
switch (newInteraction) {
case 'zoom':
target.handleZoomStart(event);
break;
case 'drag':
target.handleDragStart(event);
break;
}
}
interaction = newInteraction;
},
updateInteraction = function (event) {
if (fingers === 2) {
setInteraction('zoom');
} else if (fingers === 1 && target.canDrag()) {
setInteraction('drag', event);
} else {
setInteraction(null, event);
}
},
targetTouches = function (touches) {
return Array.prototype.slice.call(touches).map(function (touch) {
return {
x: touch.pageX,
y: touch.pageY
};
});
},
getDistance = function (a, b) {
var x, y;
x = a.x - b.x;
y = a.y - b.y;
return Math.sqrt(x * x + y * y);
},
calculateScale = function (startTouches, endTouches) {
var startDistance = getDistance(startTouches[0], startTouches[1]),
endDistance = getDistance(endTouches[0], endTouches[1]);
return endDistance / startDistance;
},
cancelEvent = function (event) {
event.stopPropagation();
event.preventDefault();
},
detectDoubleTap = function (event) {
var time = (new Date()).getTime();
if (fingers > 1) {
lastTouchStart = null;
}
if (time - lastTouchStart < 300) {
cancelEvent(event);
target.handleDoubleTap(event);
switch (interaction) {
case "zoom":
target.handleZoomEnd(event);
break;
case 'drag':
target.handleDragEnd(event);
break;
}
}
if (fingers === 1) {
lastTouchStart = time;
}
},
firstMove = true;
el.addEventListener('touchstart', function (event) {
if(target.enabled) {
firstMove = true;
fingers = event.touches.length;
detectDoubleTap(event);
}
});
el.addEventListener('touchmove', function (event) {
if(target.enabled) {
if (firstMove) {
updateInteraction(event);
if (interaction) {
cancelEvent(event);
}
startTouches = targetTouches(event.touches);
} else {
switch (interaction) {
case 'zoom':
target.handleZoom(event, calculateScale(startTouches, targetTouches(event.touches)));
break;
case 'drag':
target.handleDrag(event);
break;
}
if (interaction) {
cancelEvent(event);
target.update();
}
}
firstMove = false;
}
});
el.addEventListener('touchend', function (event) {
if(target.enabled) {
fingers = event.touches.length;
updateInteraction(event);
}
});
};
return PinchZoom;
};
if (typeof define !== 'undefined' && define.amd) {
define(['jquery'], function ($) {
return definePinchZoom($);
});
} else {
window.RTP = window.RTP || {};
window.RTP.PinchZoom = definePinchZoom(window.$);
}
}).call(this);
相關文章
- 1. 移動端手指放大縮小插件與源碼
- 2. iframe在移動端的縮放
- 3. Hudson備份/移動
- 4. hammer.js插件h5移動端手指拖拽縮放效果實踐方法
- 5. sqlserver 自動備份，壓縮，刪除多餘備份文件
- 6. 開放移動端簡單準備
- 7. 移動端分頁插件
- 8. IPC視頻在web端或移動端無插件播放
- 9. jenkins備份插件
- 10. WPF 實現縮放移動
- 更多相關文章...
- • 移動設備 統計 - 瀏覽器信息
- • Maven 插件 - Maven教程
- • IntelliJ IDEA安裝代碼格式化插件
- • SpringBoot中properties文件不能自動提示解決方法
相關標籤/搜索
每日一句
-
每一个你不满意的现在，都有一个你没有努力的曾经。
最新文章
- 1. 安裝cuda+cuDNN
- 2. GitHub的使用說明
- 3. phpDocumentor使用教程【安裝PHPDocumentor】
- 4. yarn run build報錯Component is not found in path 「npm/taro-ui/dist/weapp/components/rate/index「
- 5. 精講Haproxy搭建Web集羣
- 6. 安全測試基礎之MySQL
- 7. C/C++編程筆記：C語言中的複雜聲明分析，用實例帶你完全讀懂
- 8. Python3教程(1)----搭建Python環境
- 9. 李宏毅機器學習課程筆記2：Classification、Logistic Regression、Brief Introduction of Deep Learning
- 10. 阿里雲ECS配置速記
歡迎關注本站公眾號,獲取更多信息
相關文章
- 1. 移動端手指放大縮小插件與源碼
- 2. iframe在移動端的縮放
- 3. Hudson備份/移動
- 4. hammer.js插件h5移動端手指拖拽縮放效果實踐方法
- 5. sqlserver 自動備份，壓縮，刪除多餘備份文件
- 6. 開放移動端簡單準備
- 7. 移動端分頁插件
- 8. IPC視頻在web端或移動端無插件播放
- 9. jenkins備份插件
- 10. WPF 實現縮放移動