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推荐朋友的效果--这个效果也叫放大镜效果

(2010-04-07 11:02:47)
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杂谈

分类: JS学习班
推荐朋友的效果--这个效果也叫放大镜效果

推荐朋友的效果--这个效果也叫放大镜效果

注:此文章不是本人原创。


<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>ImageZoom 图片放大效果</title>
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<script>
var ImageZoom = function(image, viewer, options) {
    this._initialize( image, viewer, options );
    this._initMode( this.options.mode );
    this._oninit();
    this._initLoad();
};
ImageZoom.prototype = {
  //初始化程序
  _initialize: function(image, viewer, options) {
    this._image = $$(image);//原图
    this._zoom = document.createElement_x_x("img");//显示图
    this._viewer = $$(viewer);//显示框
    this._viewerWidth = 0;//显示框宽
    this._viewerHeight = 0;//显示框高
    this._preload = new Image();//预载对象
    this._rect = null;//原图坐标
    this._repairLeft = 0;//显示图x坐标修正
    this._repairTop = 0;//显示图y坐标修正
    this._rangeWidth = 0;//显示范围宽度
    this._rangeHeight = 0;//显示范围高度
    this._timer = null;//计时器
    this._loaded = false;//是否加载
    this._substitute = false;//是否替换
    
    var opt = this._setOptions(options);
    
    this._scale = opt.scale;
    this._max = opt.max;
    this._min = opt.min;
    this._originPic = opt.originPic;
    this._zoomPic = opt.zoomPic;
    this._rangeWidth = opt.rangeWidth;
    this._rangeHeight = opt.rangeHeight;
    
    this.delay = opt.delay;
    this.autoHide = opt.autoHide;
    this.mouse = opt.mouse;
    this.rate = opt.rate;
    
    this.onLoad = opt.onLoad;
    this.onStart = opt.onStart;
    this.onMove = opt.onMove;
    this.onEnd = opt.onEnd;
    
    var oThis = this, END = function(){ oThis._end(); };
    this._END = function(){ oThis._timer = setTimeout( END, oThis.delay ); };
    this._START = $$F.bindAsEventListener( this._start, this );
    this._MOVE = $$F.bindAsEventListener( this._move, this );
    this._MOUSE = $$F.bindAsEventListener( this._mouse, this );
    this._OUT = $$F.bindAsEventListener( function(e){
            if ( !e.relatedTarget ) this._END();
        }, this );
  },
  //设置默认属性
  _setOptions: function(options) {
    this.options = {//默认值
        mode:        "simple",//模式
        scale:        0,//比例(大图/原图)
        max:        10,//最大比例
        min:        1.5,//最小比例
        originPic:    "",//原图地址
        zoomPic:    "",//大图地址
        rangeWidth:    0,//显示范围宽度
        rangeHeight:0,//显示范围高度
        delay:        20,//延迟结束时间
        autoHide:    true,//是否自动隐藏
        mouse:        false,//鼠标缩放
        rate:        .2,//鼠标缩放比率
        onLoad:        $$.emptyFunction,//加载完成时执行
        onStart:    $$.emptyFunction,//开始放大时执行
        onMove:        $$.emptyFunction,//放大移动时执行
        onEnd:        $$.emptyFunction//放大结束时执行
    };
    return $$.extend(this.options, options || {});
  },
  //根据模式初始化函数属性
  _initMode: function(mode) {
    mode = $$.extend({
        options:{},
        init:    $$.emptyFunction,
        load:    $$.emptyFunction,
        start:    $$.emptyFunction,
        end:    $$.emptyFunction,
        move:    $$.emptyFunction,
        dispose:$$.emptyFunction
    }, (ImageZoom._MODE || {})[ mode.toLowerCase() ] || {} );
    
    this.options = $$.extend( mode.options, this.options );
    this._oninit = mode.init;
    this._onload = mode.load;
    this._onstart = mode.start;
    this._onend = mode.end;
    this._onmove = mode.move;
    this._ondispose = mode.dispose;
  },
  //初始化加载
  _initLoad: function() {
    var image = this._image, originPic = this._originPic,
        useOrigin = !this._zoomPic && this._scale,
        loadImage = $$F.bind( useOrigin ? this._loadOriginImage : this._loadImage, this );
    //设置自动隐藏
    if ( this.autoHide ) { this._viewer.style.display = "none"; }
    //先加载原图
    if ( originPic && originPic != image.src ) {//使用自定义地址
        image.onload = loadImage;
        image.src = originPic;
    } else if ( image.src ) {//使用元素地址
        if ( !image.complete ) {//未载入完
            image.onload = loadImage;
        } else {//已经载入
            loadImage();
        }
    } else {
        return;//没有原图地址
    }
    //加载大图
    if ( !useOrigin ) {
        var preload = this._preload, zoomPic = this._zoomPic || image.src,
            loadPreload = $$F.bind( this._loadPreload, this );
        if ( zoomPic != preload.src ) {//新地址重新加载
            preload.onload = loadPreload;
            preload.src = zoomPic;
        } else {//正在加载
            if ( !preload.complete ) {//未载入完
                preload.onload = loadPreload;
            } else {//已经载入
                this._loadPreload();
            }
        }
    }
  },
  //原图放大加载程序
  _loadOriginImage: function() {
    this._image.onload = null;
    this._zoom.src = this._image.src;
    this._initLoaded();
  },
  //原图加载程序
  _loadImage: function() {
    this._image.onload = null;
    if ( this._loaded ) {//大图已经加载
        this._initLoaded();
    } else {
        this._loaded = true;
        if ( this._scale ) {//有自定义比例才用原图放大替换大图
            this._substitute = true;
            this._zoom.src = this._image.src;
            this._initLoaded();
        }
    }
  },
  //大图预载程序
  _loadPreload: function() {
    this._preload.onload = null;
    this._zoom.src = this._preload.src;
    if ( this._loaded ) {//原图已经加载
        //没有使用替换
        if ( !this._substitute ) { this._initLoaded(); }
    } else {
        this._loaded = true;
    }
  },
  //初始化加载设置
  _initLoaded: function(src) {
    //初始化显示图
    this._initSize();
    //初始化显示框
    this._initViewer();
    //初始化数据
    this._initData();
    //开始执行
    this._onload();
    this.onLoad();
    this.start();
  },
  //初始化显示图尺寸
  _initSize: function() {
    var zoom = this._zoom, image = this._image, scale = this._scale;
    if ( !scale ) { scale = this._preload.width / image.width; }
    this._scale = scale = Math.min( Math.max( this._min, scale ), this._max );
    //按比例设置显示图大小
    zoom.width = Math.ceil( image.width * scale );
    zoom.height = Math.ceil( image.height * scale );
  },
  //初始化显示框
  _initViewer: function() {
    var zoom = this._zoom, viewer = this._viewer;
    //设置样式
    var styles = { padding: 0, overflow: "hidden" }, p = $$D.getStyle( viewer, "position" );
    if ( p != "relative" && p != "absolute" ){ styles.position = "relative"; };
    $$D.setStyle( viewer, styles );
    zoom.style.position = "absolute";
    //插入显示图
    if ( !$$D.contains( viewer, zoom ) ){ viewer.appendChild( zoom ); }
  },
  //初始化数据
  _initData: function() {
    var zoom = this._zoom, image = this._image, viewer = this._viewer,
        scale = this._scale, rangeWidth = this._rangeWidth, rangeHeight = this._rangeHeight;
    //原图坐标
    this._rect = $$D.rect( image );
    //修正参数
    this._repairLeft = image.clientLeft + parseInt($$D.getStyle( image, "padding-left" ));
    this._repairTop = image.clientTop + parseInt($$D.getStyle( image, "padding-top" ));
    //设置范围参数和显示框大小
    if ( rangeWidth > 0 && rangeHeight > 0 ) {
        rangeWidth = Math.ceil( rangeWidth );
        rangeHeight = Math.ceil( rangeHeight );
        this._viewerWidth = Math.ceil( rangeWidth * scale );
        this._viewerHeight = Math.ceil( rangeHeight * scale );
        $$D.setStyle( viewer, {
            width: this._viewerWidth + "px",
            height: this._viewerHeight + "px"
        });
    } else {
        var styles;
        if ( !viewer.clientWidth ) {//隐藏
            var style = viewer.style;
            styles = {
                display: style.display,
                position: style.position,
                visibility: style.visibility
            };
            $$D.setStyle( viewer, {
                display: "block", position: "absolute", visibility: "hidden"
            });
        }
        this._viewerWidth = viewer.clientWidth;
        this._viewerHeight = viewer.clientHeight;
        if ( styles ) { $$D.setStyle( viewer, styles ); }
        
        rangeWidth = Math.ceil( this._viewerWidth / scale );
        rangeHeight = Math.ceil( this._viewerHeight / scale );
    }
    this._rangeWidth = rangeWidth;
    this._rangeHeight = rangeHeight;
  },
  //开始
  _start: function() {
    clearTimeout( this._timer );
    var viewer = this._viewer, image = this._image, scale = this._scale;
    viewer.style.display = "block";
    this._onstart();
    this.onStart();
    $$E.removeEvent( image, "mouseover", this._START );
    $$E.removeEvent( image, "mousemove", this._START );
    $$E.addEvent( document, "mousemove", this._MOVE );
    $$E.addEvent( document, "mouseout", this._OUT );
    this.mouse && $$E.addEvent( document, $$B.firefox ? "DOMMouseScroll" : "mousewheel", this._MOUSE );
  },
  //移动
  _move: function(e) {
    clearTimeout( this._timer );
    var x = e.pageX, y = e.pageY, rect = this._rect;
    if ( x < rect.left || x > rect.right || y < rect.top || y > rect.bottom ) {
        this._END();//移出原图范围
    } else {
        var zoom = this._zoom,
            pos = this._repair(
                x - rect.left - this._repairLeft,
                y - rect.top - this._repairTop
            );
        this._onmove( e, pos );
        //设置定位
        zoom.style.left = pos.left + "px";
        zoom.style.top = pos.top + "px";
        this.onMove();
    }
  },
  //修正坐标
  _repair: function(x, y) {
    var scale = this._scale, zoom = this._zoom,
        viewerWidth = this._viewerWidth,
        viewerHeight = this._viewerHeight;
    //修正坐标
    x = Math.ceil( viewerWidth / 2 - x * scale );
    y = Math.ceil( viewerHeight / 2 - y * scale );
    //范围限制
    x = Math.min( Math.max( x, viewerWidth - zoom.width ), 0 );
    y = Math.min( Math.max( y, viewerHeight - zoom.height ), 0 );
    return { left: x, top: y };
  },
  //结束
  _end: function() {
    this._onend();
    this.onEnd();
    if ( this.autoHide ) { this._viewer.style.display = "none"; }
    this.stop();
    this.start();
  },
  //鼠标缩放
  _mouse: function(e) {
    this._scale += ( e.wheelDelta ? e.wheelDelta / (-120) : (e.detail || 0) / 3 ) * this.rate;
    
    var opt = this.options;
    this._rangeWidth = opt.rangeWidth;
    this._rangeHeight = opt.rangeHeight;
    
    this._initSize();
    this._initData();
    this._move(e);
    e.preventDefault();
  },
  //开始
  start: function() {
    if ( this._viewerWidth && this._viewerHeight ) {
        var image = this._image, START = this._START;
        $$E.addEvent( image, "mouseover", START );
        $$E.addEvent( image, "mousemove", START );
    }
  },
  //停止
  stop: function() {
    clearTimeout( this._timer );
    $$E.removeEvent( this._image, "mouseover", this._START );
    $$E.removeEvent( this._image, "mousemove", this._START );
    $$E.removeEvent( document, "mousemove", this._MOVE );
    $$E.removeEvent( document, "mouseout", this._OUT );
    $$E.removeEvent( document, $$B.firefox ? "DOMMouseScroll" : "mousewheel", this._MOUSE );
  },
  //修改设置
  reset: function(options) {
    this.stop();
    
    var viewer = this._viewer, zoom = this._zoom;
    if ( $$D.contains( viewer, zoom ) ) { viewer.removeChild( zoom ); }
    
    var opt = $$.extend( this.options, options || {} );
    this._scale = opt.scale;
    this._max = opt.max;
    this._min = opt.min;
    this._originPic = opt.originPic;
    this._zoomPic = opt.zoomPic;
    this._rangeWidth = opt.rangeWidth;
    this._rangeHeight = opt.rangeHeight;
    
    //重置属性
    this._loaded = this._substitute = false;
    this._rect = null;
    this._repairLeft = this._repairTop =
    this._viewerWidth = this._viewerHeight = 0;
    
    this._initLoad();
  },
  //销毁程序
  dispose: function() {
    this._ondispose();
    this.stop();
    if ( $$D.contains( this._viewer, this._zoom ) ) {
        this._viewer.removeChild( this._zoom );
    }
    this._image.onload = this._preload.onload =
        this._image = this._preload = this._zoom = this._viewer =
        this.onLoad = this.onStart = this.onMove = this.onEnd =
        this._START = this._MOVE = this._END = this._OUT = null
  }
}
</script>
</head>
<body>
<style>
.container{ position:relative;}
.izImage, .izViewer{border:1px solid #000;background:#fff url('http://www.cnblogs.com/images/cnblogs_com/cloudgamer/169629/o_loading.gif') no-repeat center;}
.izImage{width:300px;cursor:crosshair;}
.izViewer{width:200px;height:200px;position:absolute;left:320px;top:0;display:none;}
.izViewer div{position:absolute;border:0 dashed #999;top:0;left:0;z-index:999;width:100%;height:100%;}
</style>
<div class="container"> <img id="idImage" class="izImage" src="http://www.cnblogs.com/images/cnblogs_com/cloudgamer/143727/o_vivian.jpg" />
    <div id="idViewer" class="izViewer">
        <div style="height:50%;border-bottom-width:1px;"></div>
        <div style="width:50%;border-right-width:1px;"></div>
    </div>
</div>
<br>
<input id="idStop" value="暂停" type="button">
<input id="idHide" value="取消隐藏" type="button">
<input id="idRange" value="指定范围" type="button">
<input id="idMouse" value="鼠标缩放" type="button">
<select id="idScale">
    <option value="0">按大图放大</option>
    <option value="2">放大2倍</option>
    <option value="5">放大5倍</option>
    <option value="10">放大10倍</option>
</select>
<br>
<br>
原图:
<input id="idChangeOrigin" type="text" size="40" value="http://www.cnblogs.com/images/cnblogs_com/cloudgamer/143727/o_mm_small.jpg">
<br>
大图:
<input id="idChangeZoom" type="text" size="40" value="http://www.cnblogs.com/images/cnblogs_com/cloudgamer/143727/o_mm_big.jpg">
<br>
<input id="idChange" value="换图" type="button">
<input id="idChangeReturn" value="还原" type="button">
<script>
var iz = new ImageZoom( "idImage", "idViewer", { onLoad: function(){ $$("idStop").value = "暂停"; } } );
$$("idScale").onchange = function(){ iz.reset({ scale: this.value | 0 }); }
$$("idChange").onclick = function(){
    iz.reset({ scale: 5, originPic: $$("idChangeOrigin").value, zoomPic: $$("idChangeZoom").value });
    $$("idScale").selectedIndex = 2;
}
$$("idChangeReturn").onclick = function(){
    iz.reset({ originPic: "http://www.cnblogs.com/images/cnblogs_com/cloudgamer/143727/o_vivian.jpg", zoomPic: "" });
}
$$("idRange").onclick = function(){
    if ( this.value == "指定范围" ) {
        iz.reset({ rangeWidth: 40, rangeHeight: 40 });
        this.value = "自动范围";
    } else {
        $$D.setStyle( $$("idViewer"), { width: "", height: "" } );
        iz.reset({ rangeWidth: 0, rangeHeight: 0 });
        this.value = "指定范围";
    }
}
$$("idHide").onclick = function(){
    if ( this.value == "自动隐藏" ) {
        iz.autoHide = true;
        this.value = "取消隐藏";
    } else {
        iz.autoHide = false;
        iz._viewer.style.display = "block";
        this.value = "自动隐藏";
    }
}
$$("idMouse").onclick = function(){
    if ( this.value == "鼠标缩放" ) {
        iz.mouse = true;
        this.value = "取消缩放";
    } else {
        iz.mouse = false;
        iz.reset({ scale: $$("idScale").value | 0 });
        this.value = "鼠标缩放";
    }
}
$$("idStop").onclick = function(){
    if ( this.value == "暂停" ) {
        iz.stop(); this.value = "继续";
    } else {
        iz.start(); this.value = "暂停";
    }
}
</script>
</body>
</html>

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