基于zepto.js的模仿手机QQ空间的大图查看组件ImageView.js

/*
 * ImageView v1.0.0
 * --口袋蓝房网 基于zepto.js的大图查看 
 * --调用方法 ImageView(index,imgDada)
 * --index 图片默认值显示索引,Number  --imgData 图片url数组,Array
 * */
var ImageView=(function(window,$){
	var _this=$("#slideView"),_ImgData=[],_index=0,_length=0,
		_start=[],_org=[],_orgTime=null,
		_lastTapDate=null,
		_zoom=1,_zoomXY=[0,0],_transX=null,
		_advancedSupport = false,
		_doubleDistOrg=1,_doubleZoomOrg=1,isDoubleZoom = false,
		isSlide=true,isDrag=false,timer=null,
		winW=window.innerWidth,winH=window.innerHeight;
	
	/**
	 * 事件对象 event
	 */
	var Event={
		touchstart:function(e){
			e.preventDefault();
			if (_advancedSupport && e.touches && e.touches.length >= 2) {
                var img = getImg();
                $(img).css({"-webkit-transitionDuration": "0ms","transitionDuration": "0ms"});
                _doubleZoomOrg = _zoom;
                _doubleDistOrg = getDist(e.touches[0].pageX, e.touches[0].pageY, e.touches[1].pageX, e.touches[1].pageY);
                isDoubleZoom = true;
	            return

            }
			e = e.touches ? e.touches[0] : e;
			isDoubleZoom = false;
			_start = [e.pageX, e.pageY];
            _org = [e.pageX, e.pageY];
            _orgTime = Date.now();
            _transX = -_index * winW;
            if(_zoom!=1){
            	_zoomXY = _zoomXY || [0, 0];
                _orgZoomXY = [_zoomXY[0], _zoomXY[1]];
                var img = getImg();
                img&&($(img).css({"-webkit-transitionDuration": "0ms","transitionDuration": "0ms"}));
                isDrag = true
            }else{
            	_this.find(".pv-inner").css({"-webkit-transitionDuration":"0ms","transitionDuration":"0ms"});
            	isSlide = true
            }
		},
		touchmove:function(e){
			e.preventDefault();
			if (_advancedSupport && e.touches && e.touches.length >= 2) {
				
                var newDist = getDist(e.touches[0].pageX, e.touches[0].pageY, e.touches[1].pageX, e.touches[1].pageY);
                _zoom = (newDist/_doubleDistOrg) * _doubleZoomOrg
                
                var img = getImg();
                $(img).css({"-webkit-transitionDuration": "0ms","transitionDuration": "0ms"});
                if (_zoom < 1) {
                    _zoom = 1;
                    _zoomXY = [0, 0];
                    $(img).css({"-webkit-transitionDuration": "200ms","transitionDuration": "200ms"})
                    
                } else if (_zoom >getScale(img) * 2){
                	 _zoom = getScale(img) * 2;
                }
                   
                $(img).css({"-webkit-transform": "scale(" + _zoom + ") translate(" + _zoomXY[0] + "px," + _zoomXY[1] + "px)","transform": "scale(" + _zoom + ") translate(" + _zoomXY[0] + "px," + _zoomXY[1] + "px)"});
                return
            }
			if (isDoubleZoom){
				return;
			}
			e = e.touches ? e.touches[0] : e;
            if (_zoom != 1) {
            	var deltaX = (e.pageX - _start[0]) / _zoom;
                var deltaY = (e.pageY - _start[1]) / _zoom;
                _start = [e.pageX, e.pageY];
                
                var img = getImg();
                var newWidth = img.clientWidth *_zoom,
                	newHeight = img.clientHeight * _zoom;
                var borderX = (newWidth - winW) / 2 / _zoom,
                	borderY = (newHeight - winH) / 2 / _zoom;
                (borderX >= 0)&&(_zoomXY[0] < -borderX || _zoomXY[0] > borderX)&&(deltaX /= 3);
                (borderY > 0)&&(_zoomXY[1] < -borderY || _zoomXY[1] > borderY)&&(deltaY /= 3);
                _zoomXY[0] += deltaX;
                _zoomXY[1] += deltaY;

                (_length == 1 && newWidth < winW||newWidth < winW)&&(_zoomXY[0] = 0);
                (_length == 1 && newHeight < winH||newHeight < winH)&&(_zoomXY[1] = 0);
                
                $(img).css({"-webkit-transform": "scale(" + _zoom + ") translate(" + _zoomXY[0] + 
                    "px," + _zoomXY[1] + "px)","transform": "scale(" + _zoom + ") translate(" + _zoomXY[0] + 
                    "px," + _zoomXY[1] + "px)"})
            }else{
				if (!isSlide) return;
	            var deltaX = e.pageX - _start[0];
	            (_transX > 0 || _transX < -winW * (_length - 1))&&(deltaX /= 4);
	            _transX = -_index * winW + deltaX;
	            _this.find(".pv-inner").css({"-webkit-transform":"translate(" + _transX + "px,0px) translateZ(0)"});

            }
		},
		touchend:function(e){
			if (isDoubleZoom) {
                return;
            }
			if (_zoom != 1) {
				if (!isDrag){return;}
				var img = getImg();
                var newWidth = img.clientWidth *_zoom,
                	newHeight = img.clientHeight * _zoom;
                var borderX = (newWidth - winW) / 2 / _zoom,
                	borderY = (newHeight - winH) / 2 / _zoom;
                	
				if (_length > 1 && borderX >= 0) {
                    var updateDelta = 0;
                    var switchDelta = winW / 6;
                    if (_zoomXY[0] < -borderX - switchDelta / _zoom && _index < _length - 1){
                        updateDelta = 1;
                    }else if (_zoomXY[0] > borderX + switchDelta / _zoom && _index > 0){
                        updateDelta = -1;
                    }
                    if (updateDelta != 0) {
                        scaleDown(img);
                        changeIndex(_index + updateDelta);
                        return
                    }
                }
                var delta = Date.now() - _orgTime;
                if (delta < 300) {
                    (delta <= 10)&&(delta = 10);
                    var deltaDis = Math.pow(180 / delta, 2);
                    _zoomXY[0] += (_zoomXY[0] - _orgZoomXY[0]) * deltaDis;
                    _zoomXY[1] += (_zoomXY[1] - _orgZoomXY[1]) * deltaDis;
                    $(img).css({"-webkit-transition": "400ms cubic-bezier(0.08,0.65,0.79,1)","transition": "400ms cubic-bezier(0.08,0.65,0.79,1)"})
                } else{
                	$(img).css({"-webkit-transition": "200ms linear","transition": "200ms linear"});
                }
                    
                if (borderX >= 0){
                	if (_zoomXY[0] < -borderX){
                    	_zoomXY[0] = -borderX;
                    }else if (_zoomXY[0] > borderX){
                    	_zoomXY[0] = borderX;
                    }
                }
                                        
                if (borderY > 0){
                	if (_zoomXY[1] < -borderY){
                		_zoomXY[1] = -borderY;
                	}else if (_zoomXY[1] >borderY){
                		_zoomXY[1] = borderY;
                	}
                }
                    
                if (Math.abs(_zoomXY[0]) < 10) {
                    $(img).css({"-webkit-transform": "scale(" + _zoom + ") translate(0px," + _zoomXY[1] + "px)","transform": "scale(" + _zoom + ") translate(0px," + _zoomXY[1] + "px)"});
                    return
                } else{
                	$(img).css({"-webkit-transform": "scale(" + _zoom + ") translate(" + _zoomXY[0] + "px," + _zoomXY[1] + "px)","transform": "scale(" + _zoom + ") translate(" + _zoomXY[0] + "px," + _zoomXY[1] + "px)"});
                }
                isDrag = false

			}else{
				if (!isSlide){ return;}
               	var deltaX = _transX - -_index * winW;
				var updateDelta = 0;
	            if (deltaX > 50){
	            	updateDelta = -1;
	            }else if(deltaX < -50){
	            	updateDelta = 1;
	            }
	            _index=_index+updateDelta;
	            changeIndex(_index);
	            isSlide =false
			}
			
		},
		click:function(e){
			_zoom=1;
			_zoomXY=[0,0];
			_this.css("opacity","0");
			timer=setTimeout(function(){
				_this.css({"display":""}).html("");
				unbind();
			},150)
		},
		dobelTap:function(e){
            clearTimeout(timer);
			var now = new Date;
            if (now - _lastTapDate < 500){
            	return;
            }
            _lastTapDate = now;
            var img = getImg();
            if (!img){
            	return;
            }

            if (_zoom != 1){
            	scaleDown(img);
            }else{
            	scaleUp(img);
            }
		},
		setView:function(e){
			winW=window.innerWidth;
			winH=window.innerHeight;
			_this.width(window.innerWidth).height(window.innerHeight);
			translate((-_index*window.innerWidth),0,0,$(".pv-inner")[0]);
			scaleDown(getImg())
		}
		
	};
	var handleEvent=function(e){
		switch (e.type){
			case "touchstart":
				Event.touchstart(e);
				break;
			case "touchmove":
				Event.touchmove(e);
				break;
			case "touchcancel":
			case "touchend":
				Event.touchend(e);
				break;
			case "orientationchange":
            case "resize":
                Event.setView(e);
                break
		}
	};
	
	
	/**
	 * 绑定事件
	 */
	var bind=function(){
		
        _this.on("singleTap",function(e){
        	e.preventDefault();
        	var now = new Date;
            if (now - _lastTapDate < 500){
                return;            	
            }
            _lastTapDate = now;
			Event.click(e);
			return false;
		}).on("doubleTap", function(e) {
            e.preventDefault();
            Event.dobelTap(e);
            return false;
        });
		_this.on("touchstart touchmove touchend touchcancel", function(e) {
            handleEvent(e);
            
        });
		Event.setView();
		
		"onorientationchange" in window ? window.addEventListener("orientationchange",Event.setView,false) : window.addEventListener("resize",Event.setView,false);
		
	};
	
	/**
	 * 解除事件
	 */
	var unbind= function() {
         _this.off();
       	"onorientationchange" in window ? window.removeEventListener("orientationchange",Event.setView, false) : window.removeEventListener("resize",Event.setView, false)
	};
	var getDist= function(x1, y1, x2, y2) {
		
	    return Math.sqrt(Math.pow(x2 - x1, 2) + Math.pow(y2 - y1, 2), 2)
	}
	/**
	 * 图片缩放
	 */
	var getScale=function(img) {
		var h = img.naturalHeight, w = img.naturalWidth,
		Scale=w*h/(img.clientHeight*img.clientWidth);
		return Scale;
	};
	var scaleUp=function(img) {
        var scale = getScale(img);
        if (scale > 1)
            $(img).css({"-webkit-transform": "scale(" + scale + ")","transform": "scale(" + scale + ")","-webkit-transition": "200ms","transition": "200ms"});
        _zoom = scale;
	};
    var scaleDown=function(img) {
        _zoom = 1;
        _zoomXY = [0, 0];
        _doubleDistOrg = 1;
        _doubleZoomOrg = 1;
        $(img).css({"-webkit-transform": "scale(1)","transform": "scale(1)","-webkit-transition": "200ms","transition": "200ms"});
	};
	
	
	/**
	 * 滑动效果
	 * dist 
	 */
	var translate = function( distX,distY,speed,ele) {
		if( !!ele ){ ele=ele.style; }else{ return; }
		ele.webkitTransitionDuration =  ele.MozTransitionDuration = ele.msTransitionDuration = ele.OTransitionDuration = ele.transitionDuration =  speed + ‘ms‘;
		ele.webkitTransform = ‘translate(‘ + distX + ‘px,‘+distY+‘px)‘ + ‘translateZ(0)‘;
		ele.msTransform = ele.MozTransform = ele.OTransform = ‘translateX(‘ + distX + ‘px) translateY(‘ + distY + ‘px)‘;
	};
	
	/**
	 * 更改索引值 _index
	 */
	var changeIndex=function(index,force){
		if (index < 0){
			index = 0;
		}else if(index >= _length){
			index =_length - 1;
		}
		
		_index = index;
		translate((-_index*window.innerWidth),0,force? "0" : "200" ,$(".pv-inner")[0]);
		$("#J_index").html(_index+1+"/"+_length);
		imgLoad();
	}
	
	
	/**
	 * 图片获取
	 */
	var getImg=function(index) {
        var img = _this.find("li").eq(index || _index).find("img");
        if (img.size() == 1){
			return img[0];
        }else{
			return null
        }
    }
	
	/**
	 * 图片加载 
	 */
	var imgLoad=function(){
		if($(".pv-img").eq(_index).find("img")[0]){ 
			$("#J_loading").css("display","");
			return;
		}else{
			$("#J_loading").css("display","block");
			var tempImg=new Image(),w,h,set;
			tempImg.src=_ImgData[_index];
			$(".pv-img").eq(_index)[0].appendChild(tempImg);
			tempImg.onload=function(){
				$("#J_loading").css("display","");
			}
		}
		
		
	};
	
	
	/**
	 * 创建大图查看Dome结构
	 */
	var Create=function(){
		_this.append("<ul class=‘pv-inner‘></ul>").append("<p class=‘counts‘><span class=‘value‘ id=‘J_index‘>"+(_index+1)+"/"+_length+"</span></p>").append("<span class=‘ui-loading‘ id=‘J_loading‘ ><i class=‘t1‘></i><i class=‘t2‘></i><i class=‘t3‘></i></span>")
		for(var i=0;i<_length;i++){
			$(".pv-inner").append("<li class=‘pv-img‘></li>")
		}
		imgLoad();
	
	};
	
	
	/**
	 * 大图查看初始化
	 */
	var init=function(){
		!!_this[0]||$("body").append("<div class=‘slide-view‘ id=‘slideView‘></div>");
		_this=$("#slideView");
		($.os.iphone || $.os.android && parseFloat($.os.version) >= 4)&&(_advancedSupport = true);
	}();
	
	/**
	 * 大图查看返回接口函数
	 * ImageView(index,data)
	 * index 初始索引值 nubmer
	 * data 图片数组 array
	 */
	var ImageView=function(index,data){
		_ImgData=data;
		_index=index;
		_length=data.length;
		
		//创建dom结构
		Create();
		//dom结构显示
		_this.css("display","block");
		//绑定事件
		bind();
	}
	return ImageView;
})(window,Zepto);

/*大图查看*/
.slide-view {background: #000;position: fixed;width: 100%;height: 100%;overflow: hidden;top: 0;left: 0;z-index: 100;opacity:0;display: none;-webkit-animation:fadeIn .2s linear forwards;animation:fadeIn .2s linear forwards;-webkit-touch-callout: none;-webkit-transform-style: preserve-3d; }
.slide-view .counts {position: absolute;top: 5%;left: 0;right: 0;text-align: center;font-size: 0;-webkit-transform-style: preserve-3d; }
.slide-view .counts .value {border-radius: 9px;line-height: 18px;padding: 0 6px;font-size: 11px;display: inline-block;background-color: rgba(102,102,102,.6);color: #f1f1f1;}
.pv-inner {position: relative;z-index: -1;display: -webkit-box;display: box;width: 100%;height: 100%;-webkit-transition: all 350ms linear;-webkit-backface-visibility: hidden;transition: all 350ms linear;backface-visibility: hidden;-webkit-touch-callout: none;-webkit-transform-style: preserve-3d; }
.pv-inner li {text-align: center;display: -webkit-box;display: box;-webkit-box-align: center;overflow: hidden;width: 100%;height: 100%;-webkit-touch-callout: none;backface-visibility: hidden;-webkit-transform-style: preserve-3d; }
.pv-inner img {max-width: 97%;max-height: 100%;-webkit-transform: scale(1) translate(0px,0px);transform: scale(1) translate(0px,0px);visibility: visible;-webkit-transition: 200ms;transition: 200ms;-webkit-user-select: none;user-select: none;display: block;margin: 0 auto;backface-visibility: hidden;-webkit-transform-style: preserve-3d; }

@-webkit-keyframes fadeIn{
	0%{opacity:0;}
	100%{opacity:1;}
}
@keyframes fadeIn{
	0%{opacity:0;}
	100%{opacity:100%;}
}



/*--------------------loading-----------------------*/
.ui-loading {position: absolute;left: 50%;top: 50%;display: none;vertical-align: middle;font: 0/0 arial;margin: -5px 0 0 -10px;}
.ui-loading i {display: inline-block;width: 5px;height: 12px;background: #fff;vertical-align: top;-webkit-animation: loading-spin 1s infinite linear;animation: loading-spin 1s infinite linear;}
.ui-loading i {-webkit-animation: loading-spin 1s infinite linear;animation: loading-spin 1s infinite linear}
.ui-loading i.t2 {margin: 0 3px;-webkit-animation-name: loading-spin-one;animation-name: loading-spin-one}
.ui-loading i.t3 {-webkit-animation-name: loading-spin-two;animation-name: loading-spin-two}
@-webkit-keyframes loading-spin {
    0% {opacity: 0}
    30% {opacity: 1;-webkit-transform: scale(1,1.2)}
    60% {opacity: 0;-webkit-transform: scale(1)}
    100% {opacity: 0}
}
@-webkit-keyframes loading-spin-one {
	0% {opacity: 0}
    20% {opacity: 0}
    50% {opacity: 1;-webkit-transform: scale(1,1.2)}
    80% {opacity: 0;-webkit-transform: scale(1)}
    100% {opacity: 0}
}
@-webkit-keyframes loading-spin-two {
    0% {opacity: 0}
    40% {opacity: 0}
    70% {opacity: 1;-webkit-transform: scale(1,1.2)}
    100% {opacity: 0;-webkit-transform: scale(1)}
}
@keyframes loading-spin {
    0% {opacity: 0}
    30% {opacity: 1;transform: scale(1,1.2)}
    60% {opacity: 0;transform: scale(1)}
    100% {opacity: 0}
}

@keyframes loading-spin-one {
    0% {opacity: 0}
    20% {opacity: 0}
    50% {opacity: 1;transform: scale(1,1.2)}
    80% {opacity: 0;transform: scale(1)}
    100% {opacity: 0}
}

@keyframes loading-spin-two {
    0% {opacity: 0}
    40% {opacity: 0}
    70% {opacity: 1;transform: scale(1,1.2)}
    100% {opacity: 0;transform: scale(1)}
}
/*--------------------loading-end----------------------*/

<!DOCTYPE html>
<html>
	<head>
		<meta 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>移动端大图查看</title>
		<script type="text/javascript" src="test_files/zepto.min.js" ></script>
		<script type="text/javascript" src="test_files/ImageView.js" ></script>
	</head>
	<body>
		
		<!--以上为HTML页面结构 -->
		<!--以下为ImageView使用例子 -->
		<script>
			;(function(){
				//获取 html 中的图片元素
				var aImg=document.querySelectorAll("img"),
					aImgSrc=[];
				
				//为图片绑定单击事件
				for(var i=0,l=aImg.length;i<l;i++){
					aImg[i].index=i;
					aImg[i].className+=" conPic";
					aImgSrc.push(aImg[i].src);
				}
				for(var i=0;i<$(".conPic").length;i++){
					if($(".conPic")[i].complete){
						addTap($(".conPic")[i])
					}else{
						$(".conPic")[i].onload=function(){
							addTap(this);
						}
					}
				}
				function addTap(obj){
					$(obj).on("tap",function(){
						//调用ImageView
						ImageView($(obj)[0].index,aImgSrc);
					})
				}
				
			})();
		</script>
	</body>
</html>