引用自http://www.cnblogs.com/lovesong/p/5004951.html
bug：
滚轮缩放，底层页面显示高度也会跟着移动；
esc、上、下、左、右键在未点击当前iframe下，并没有生效；
修复：
未阻止滚轮事件冒泡；
图片查看是在新打开的html页面查看，在用户未点击情况下，焦点停留在底层页面，需在打开页面后自动为当前window对象获取焦点，并组织键盘事件冒泡
下附完整代码
/*
* AppGo使用的 图片查看插件
* Author : lufeng@bingosoft.net
* Version: 1.0.0
* Date : 2015/11/17
*/
(function($) {
var windowMargin = 8; //加多边距的宽高，使得图片看起来有边框效果
//图片查看器
$.fn.extend({
photoGallery: function(options) {
var isFirefox = navigator.userAgent.indexOf("Firefox") > -1 ;
var MOUSEWHEEL_EVENT = isFirefox ? "DOMMouseScroll" : "mousewheel";
var defaults = {
//图片缩放倍率
ratio : 1.2,
//右下角缩略图宽度
thumbnailsWidth : 180,
//右下角缩略图高度
thumbnailsHeight : 120,
//HTML模版
template : {
//操作工具
OPERTATION : '<div class="oper">' +
'<span class="prev"><i class="icon_tool-prev"></i></span>' +
'<span class="next"><i class="icon_tool-next"></i></span>' +
'</div>' +
'<div class="tool">' +
'<div class="toolct">' +
/*'<span class="oper_fullscreen" title="查看全屏"><i class="icon_tool-fullscreen"></i></span>' +*/
'<span class="oper_bigger" title="放大图片"><i class="icon_tool-bigger"></i></span>' +
'<span class="oper_smaller" title="缩小图片"><i class="icon_tool-smaller"></i></span>' +
'<span class="oper_rotate" title="向右旋转"><i class="icon_tool-rotate"></i></span>' +
/*'<span class="oper_download" title="下载图片"><i class="icon_tool-download"></i></span>' +*/
'</div>' +
'</div>',
//缩略图
THUMBNAILS : "<div class='thumbnails'>" +
'<span class="thumbClose" title="关闭缩略图"><i class="icon_close-small"></i></span>' +
'<img ondragstart="return false;"/>' +
'<div class="thumbDrag"><span></span></div>' +
"</div>",
//大图
IMAGE : '<img class="p_w_picpath" ondragstart="return false;"/>'
}
};
var o = $.extend(defaults, options),
$gallery = $(this);
$gallery.append(o.template.OPERTATION).append(o.template.THUMBNAILS);
var $tool = $(this).find(".tool"),
$fullscreen = $(this).find(".oper_fullscreen"),
$bigger = $(this).find(".oper_bigger"),
$smaller = $(this).find(".oper_smaller"),
$rotate = $(this).find(".oper_rotate"),
$download = $(this).find(".oper_download"),
$prev = $(this).find(".prev"),
$next = $(this).find(".next"),
$thumbnails = $(this).find(".thumbnails"),
$p_w_picpath,
$thumbImg,
p_w_picpathWidth,
p_w_picpathHeight,
imgRatio,
dragX,
dragY,
cW,
cH,
w,h,isVertical,
thumbX,
thumbY;
//上一张
$prev.on('click',function(){
if(o.activeIndex > 0) o.activeIndex--;
toggleImage();
}).on("mouseover",function(e){
if(o.activeIndex > 0)
$(this).addClass("active");
}).on("mouseout",function(e){
$(this).removeClass("active");
});
//下一张
$next.on('click',function(){
if(o.activeIndex < o.imgs.length -1) o.activeIndex++;
toggleImage();
}).on("mouseover",function(e){
if(o.activeIndex < o.imgs.length -1)
$(this).addClass("active");
}).on("mouseout",function(e){
$(this).removeClass("active");
});
//缩略图
$thumbnails.css({
height: o.thumbnailsHeight,
width : o.thumbnailsWidth
}).on("mouseenter",function(e){
thumbX = -1;
}).on("mousedown",function(e){
thumbX=e.pageX || e.clientX;
thumbY=e.pageY || e.clientY;
cW = document.body.clientWidth;
cH = document.body.clientHeight;
e.stopPropagation();
}).on("mousemove",function(e){
if(thumbX > 0){
var nextDragX=e.pageX || e.clientX;
var nextDragY=e.pageY || e.clientY;
var $td= $(this).find(".thumbDrag"),
p_w_picpathWidth = $p_w_picpath.width(),
p_w_picpathHeight = $p_w_picpath.height(),
thumbImgWidth = $thumbImg.width(),
thumbImgHeight = $thumbImg.height(),
left =parseFloat($td.css("left")) + (nextDragX - thumbX),
top =parseFloat($td.css("top")) + (nextDragY - thumbY),
w = $td.width(),
h = $td.height(),
it,
il,
maxL,
maxT;
if(isVertical){
thumbImgWidth = [thumbImgHeight, thumbImgHeight = thumbImgWidth][0];
p_w_picpathWidth = [p_w_picpathHeight, p_w_picpathHeight = p_w_picpathWidth][0];
}
it = (o.thumbnailsHeight - thumbImgHeight) / 2 ,
il = (o.thumbnailsWidth - thumbImgWidth) / 2,
maxL = o.thumbnailsWidth - w - il - 2, //减去2像素边框部分
maxT = o.thumbnailsHeight - h - it - 2;
if(left < il ) left = il;
else if(left > maxL) left = maxL;
if(top < it ) top = it;
else if(top > maxT) top = maxT;
$td.css({
left : left,
top : top
})
thumbX=nextDragX;
thumbY=nextDragY;
if(p_w_picpathWidth < cW) left = (cW - p_w_picpathWidth) / 2;
else left = -p_w_picpathWidth * (left-il) / thumbImgWidth;
if(p_w_picpathHeight < cH ) top = (cH - p_w_picpathHeight) / 2;
else top = -p_w_picpathHeight * (top-it) / thumbImgHeight;
$p_w_picpath.offset({
left : left,
top : top
});
}
}).on("mouseup",function(e){
thumbX = -1;
});
$thumbnails.find(".thumbClose").on("click",function(){
$thumbnails.hide();
});
//显示工具栏
$gallery.on("mouseover",function(e){
$tool.show();
}).on("mouseenter",function(e){
dragX = -1;
}).on("mouseout",function(e){
$tool.hide();
}).on("mousedown",function(e){
dragX=e.pageX || e.clientX;
dragY=e.pageY || e.clientY;
cW = document.body.clientWidth;
cH = document.body.clientHeight;
e.stopPropagation();
}).on("mousemove",function(e){
if(dragX > 0){
var nextDragX=e.pageX || e.clientX;
var nextDragY=e.pageY || e.clientY ;
var o = $p_w_picpath.offset(),
left =o.left + (nextDragX - dragX),
top =o.top + (nextDragY - dragY),
w = $p_w_picpath.width(),
h = $p_w_picpath.height();
if(isVertical){
w = [h, h = w][0];
}
if(w > cW){
if(left > 0){
left = 0 ;
}
else if(left < cW - w){
left = cW - w;
}
}else{
left = o.left;
}
if(h > cH){
if(top > 0){
top = 0 ;
}
else if(top < cH - h){
top = cH - h;
}
} else{
top = o.top;
}
$p_w_picpath.offset({
left : left,
top : top
});
dragX=nextDragX;
dragY=nextDragY;
setThumbnails(); //缩略图拖拽点
}
}).on("mouseup",function(e){
dragX = -1;
});
//全屏
var isMax,preWidth, preHeight, preTop, preLeft;
$fullscreen.on("click", function(){
var parentD = window.parent.document,
J = $(parentD.getElementById("J_pg"));
if(!isMax){
isMax = true;
preWidth = document.body.clientWidth;
preHeight = document.body.clientHeight;
preTop = J.css("top");
preLeft = J.css("left");
J.css({
top: 0,
left : 0,
width : parentD.body.clientWidth,
height : parentD.body.clientHeight,
});
} else{
isMax = false;
J.css({
top: preTop,
left : preLeft,
width : preWidth,
height : preHeight
});
}
});
//放大图片
$bigger.on("click", function(){
biggerImage();
});
//缩小图片
$smaller.on("click", function(){
smallerImage();
});
//旋转
$rotate.on("click", function(){
var rotateClass = $p_w_picpath.attr("class").match(/(rotate)(\d*)/);
if(rotateClass){
var nextDeg = (rotateClass[2] * 1 + 90) % 360;
$p_w_picpath.removeClass(rotateClass[0]).addClass("rotate" + nextDeg);
$thumbImg.removeClass(rotateClass[0]).addClass("rotate" + nextDeg);
resizeImage(nextDeg);
resizeThumbImg(nextDeg);
isVertical = nextDeg == 90 || nextDeg == 270;
} else{
$p_w_picpath.addClass("rotate90");
$thumbImg.addClass("rotate90");
resizeImage("90");
resizeThumbImg("90");
isVertical = true;
}
});
//下载
$download.on("click", function(){
var imgUrl = $p_w_picpath.attr("src");
if(!imgUrl) return;
alert("没有找到兼容所有浏览器方法，所以暂不实现");
});
$(window).on("resize",function(){
setImagePosition();
});
if(document.attachEvent){
document.attachEvent("on"+MOUSEWHEEL_EVENT, function(e){
mouseWheelScroll(e);
});
} else if(document.addEventListener){
document.addEventListener(MOUSEWHEEL_EVENT, function(e){
mouseWheelScroll(e);
}, false);
}
function mouseWheelScroll(e){
window.onmousewheel=function(){
return false
};
e.preventDefault();
var _delta = parseInt(e.wheelDelta || -e.detail);
//向上滚动
if (_delta > 0) {
biggerImage();
}
//向下滚动
else {
smallerImage();
}
}
//键盘上下左右键
document.onkeydown = function(e){
e = e || window.event;
if (e.keyCode) {
e.preventDefault();
if(e.keyCode == 37 ){ //left
if(o.activeIndex > 0) o.activeIndex--;
toggleImage();
}
if(e.keyCode == 39 ){ //right
if(o.activeIndex < o.imgs.length -1) o.activeIndex++;
toggleImage();
}
if(e.keyCode == 27 ){ // ESC键 CLOSE
$(".closeWin").click();
}
if(e.keyCode == 38 ){ // 使用上下键缩放图片
biggerImage();
}
if(e.keyCode == 40 ){
smallerImage();
}
}
};
function init(){
toggleImage();
$(o.imgs).each(function(i, img){
$(o.template.IMAGE)
.appendTo($gallery)
.attr("src", img.url)
.attr("index", i)
.css({
width : img.imgWidth,
height : img.imgHeight,
left : (cW - img.imgWidth)/2,
top: (cH - img.imgHeight)/2
// }).on("dblclick", function(){换为鼠标单击事件
}).on("onclick", function(){
app.window.close();
});
});
$p_w_picpath = $(".p_w_picpath[index='"+o.activeIndex+"']", $gallery).addClass("active");
}
function toggleImage(){
p_w_picpathWidth = o.imgs[o.activeIndex].imgWidth;
p_w_picpathHeight = o.imgs[o.activeIndex].imgHeight;
imgRatio = p_w_picpathWidth/ p_w_picpathHeight;
cW = document.body.clientWidth;
cH = document.body.clientHeight;
$(".p_w_picpath", $gallery).removeClass("active");
$p_w_picpath = $(".p_w_picpath[index='"+o.activeIndex+"']", $gallery).addClass("active").css({
width : p_w_picpathWidth,
height : p_w_picpathHeight
}).removeClass("rotate0 rotate90 rotate180 rotate270");
$thumbImg = $thumbnails.find("img").attr("src", o.imgs[o.activeIndex].url);
$thumbnails.find("img").removeAttr("class").removeAttr("style");
isVertical = false;
$thumbnails.hide();
$prev.removeClass("active");
$next.removeClass("active");
setImagePosition();
}
function biggerImage(){
var w = $p_w_picpath.width(),
h = $p_w_picpath.height(),
nextW = w * o.ratio,
nextH = h * o.ratio;
if(nextW - w < 1) nextW = Math.ceil(nextW);
var percent = (nextW / p_w_picpathWidth * 100).toFixed(0) ;
if(percent > 90 && percent < 110){
percent = 100;
nextW = p_w_picpathWidth;
nextH = p_w_picpathHeight;
}
else if(percent > 1600) {
percent = 1600;
nextW = p_w_picpathWidth * 16;
nextH = p_w_picpathHeight * 16;
}
$p_w_picpath.width(nextW).height(nextH);
setImagePosition();
showPercentTip(percent);
showThumbnails(nextW, nextH);
}
function smallerImage(){
var w = $p_w_picpath.width(),
h = $p_w_picpath.height(),
nextW,
nextH;
var percent = (w / o.ratio / p_w_picpathWidth * 100).toFixed(0) ;
if(percent < 5) {
percent = 5;
nextW = p_w_picpathWidth / 20;
nextH = p_w_picpathHeight / 20;
}
else if(percent > 90 && percent < 110){
percent = 100;
nextW = p_w_picpathWidth;
nextH = p_w_picpathHeight;
} else{
nextW = w / o.ratio;
nextH = h / o.ratio;
}
$p_w_picpath.width(nextW).height(nextH);
setImagePosition();
showPercentTip(percent);
showThumbnails(nextW, nextH);
}
//显示缩略图
function showThumbnails(width, height){
if(isVertical) width = [height, height = width][0];
if(width > document.body.clientWidth || height > document.body.clientHeight){
$thumbnails.show();
setThumbnails();
} else{
$thumbnails.hide();
}
}
//重置图片宽高
function resizeImage(rotateDeg){
var mH = document.body.clientHeight - windowMargin,
mW = document.body.clientWidth - windowMargin;
if(rotateDeg == '90' || rotateDeg == '270'){
mW = [mH, mH = mW][0];
}
var width, height;
width = Math.min(p_w_picpathWidth, mW);
height = Math.min(p_w_picpathHeight, mH);
if(width / height > imgRatio){
width = height * imgRatio;
} else{
height = width / imgRatio;
}
$p_w_picpath.css({
width:width,
height:height
});
setImagePosition();
}
function resizeThumbImg(rotateDeg){
var maxW = o.thumbnailsWidth, maxH = o.thumbnailsHeight;
if(rotateDeg == '90' || rotateDeg == '270'){
maxW = [maxH, maxH = maxW][0];
}
$thumbImg.css({
maxWidth : maxW,
maxHeight : maxH
});
$thumbnails.hide();
}
//显示百分比提示
function showPercentTip(percent){
$gallery.find(".percentTip").remove();
$("<div class='percentTip'><span>"+percent+"%</span></div>").appendTo($gallery).fadeOut(1500);
}
//设置图片位置
function setImagePosition(){
var w = $p_w_picpath.width(),
h = $p_w_picpath.height(),
cW = document.body.clientWidth,
cH = document.body.clientHeight;
var left = (cW - w)/2,
top = (cH - h)/2;
$p_w_picpath.css("left", left +"px").css("top", top+"px");
}
//设置缩略图拖拽区域
function setThumbnails(){
var $img = $thumbnails.find("img"),
sW = $img.width(),
sH = $img.height(),
w = $p_w_picpath.width(),
h = $p_w_picpath.height(),
imf = $p_w_picpath.offset(),
imfl = imf.left,
imft = imf.top,
cW = document.body.clientWidth,
cH = document.body.clientHeight,
tW,
tH,
tl,
tt;
if(isVertical){
sW = [sH, sH = sW][0];
w = [h, h = w][0];
}
tW = sW / (w / cW);
if(w < cW) tW = sW;
tH = sH / (h / cH);
if(h < cH) tH = sH;
tl = (o.thumbnailsWidth - sW)/2 + -imfl/w * sW ;
if(w < cW) tl = (o.thumbnailsWidth - sW)/2;
tt = (o.thumbnailsHeight - sH)/2 + -imft/h * sH ;
if(h < cH) tt = (o.thumbnailsHeight - sH)/2;
$thumbnails.find(".thumbDrag").css({
width: tW,
height: tH,
left: tl,
top: tt
});
}
init();
return this;
}
});
$.extend({
//打开图片查看器
openPhotoGallery : function(obj){
// $('html').css('overflow', 'hidden');
var $img = $(obj),
imgUrl = $img[0].src;
if(!imgUrl) return;
//HTML5提供了一个新属性naturalWidth/naturalHeight可以直接获取图片的原始宽高
var img = $img[0],
imgHeight = img.naturalHeight,
imgWidth = img.naturalWidth,
ratio = imgWidth / imgHeight,
wH = 415,
wW = 615,
winHeight,
winWidth,
maxHeight = document.body.clientHeight - windowMargin * 2,
maxWidth = document.body.clientWidth- windowMargin * 2;
winWidth = Math.max(wW, imgWidth);
winHeight = Math.max(wH, imgHeight);
if(winWidth > maxWidth) {
winWidth = maxWidth;
winHeight =Math.max(wH, Math.ceil(winWidth / ratio));
if(imgWidth > winWidth) {
imgWidth = winWidth;
imgHeight = Math.ceil(imgWidth / ratio);
}
}
if(winHeight > maxHeight) {
winHeight = maxHeight;
winWidth = Math.max(wW, Math.ceil(winHeight * ratio));
if(imgHeight > winHeight) {
imgHeight = winHeight;
imgWidth = Math.ceil(imgHeight * ratio);
}
}
var $gallerys = $(obj).closest(".gallerys"),
activeIndex=0,
imgs = [];
$gallerys.find(".gallery-pic").each(function(i, elem){
var url = this.src,
img = $(this)[0],
nH = img.naturalHeight,
nW = img.naturalWidth,
ratio = nW / nH,
w = nW,
h = nH;
if(url == imgUrl){
activeIndex = i;
w = imgWidth;
h = imgHeight;
}
else{
if(nW > winWidth) {
w = winWidth;
nH = h = Math.ceil(w / ratio);
if( h > winHeight){
nH = h = winHeight;
w = Math.ceil(h * ratio);
}
}
if(nH > winHeight) {
h = winHeight;
w = Math.ceil(h * ratio);
if( w > winWidth){
w = winWidth;
h = Math.ceil(w / ratio);
}
}
}
imgs.push({
url: url,
imgHeight : h,
imgWidth : w
});
});
localStorage["photoGalleryImgs"] = JSON.stringify(imgs); //因为此字符串可能是base64字符，appgo无法传
localStorage["photoGalleryActiveIndex"] = activeIndex;
$("#J_pg").remove();
$("<iframe></iframe>").appendTo("body")
.attr("id", "J_pg")
.attr("src", "/js/libs/jquery-photo-gallery/gallery.html")
.css('z-index','9999')
.css({
position : "fixed",
left : 0,
top : 0,
width : document.documentElement.clientWidth,
height : document.documentElement.clientHeight,
background: 'rgba(177, 178, 179, 0.6)',
border: '1px solid #6D6D6D',
'border-radius': '4px'
});
//打开iframe后将焦点移动到该元素，保证再不点击的情况下，设置的键盘事件生效
var J_iframe = document.getElementById('J_pg').contentWindow;
J_iframe.focus();
},
//做初始化
initGallery : function(){
var activeIndex = localStorage["photoGalleryActiveIndex"],
imgs = JSON.parse(localStorage["photoGalleryImgs"]);
localStorage.removeItem("photoGalleryActiveIndex");
localStorage.removeItem("photoGalleryImgs");
$(".gallery").photoGallery({
imgs : imgs,
activeIndex:activeIndex
});
$(".closeWin").click(function(){
var _parent = window.parent || window.top,
_jg = _parent.document.getElementById("J_pg");
$(_jg).remove();
});
}
});
})(jQuery);
