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(function($){
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$.zUI = $.zUI || {}
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$.zUI.emptyFn = function(){};
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$.zUI.asWidget = [];
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/*
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* core代码，定义增加一个插件的骨架
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*/
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$.zUI.addWidget = function(sName,oSefDef){
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//设置规范中的常量sFlagName、sEventName、sOptsName
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$.zUI.asWidget.push(sName);
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var w = $.zUI[sName] = $.zUI[sName] || {};
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var sPrefix = "zUI" + sName
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w.sFlagName = sPrefix;
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w.sEventName = sPrefix + "Event";
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w.sOptsName = sPrefix + "Opts";
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w.__creator = $.zUI.emptyFn;
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w.__destroyer = $.zUI.emptyFn;
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$.extend(w,oSefDef);
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w.fn = function(ele,opts){
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var jqEle = $(ele);
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jqEle.data(w.sOptsName,$.extend({},w.defaults,opts));
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//如果该元素已经执行过了该插件，直接返回，仅相当于修改了配置参数
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if(jqEle.data(w.sFlagName)){
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return;
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}
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jqEle.data(w.sFlagName,true);
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w.__creator(ele);
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jqEle.on(jqEle.data(w.sEventName));
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};
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w.unfn = function(ele){
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w.__destroyer(ele);
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var jqEle = $(ele);//移除监听事件
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if(jqEle.data(w.sFlagName)){
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jqEle.off(jqEle.data(w.sEventName));
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jqEle.data(w.sFlagName,false);
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}
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}
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}
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/*
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* draggable
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* 参数：obj{
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* bOffsetParentBoundary:是否以定位父亲元素为边界,
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* oBoundary:指定元素left和top的边界值，形如{iMinLeft:...,iMaxLeft:...,iMinTop:...,iMaxTop:...},与上一个参数互斥
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* fnComputePosition:扩展函数，返回形如{left:...,top:...}的对象
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* }
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* 支持的自定义事件:
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* "draggable.start":drag起始，就是鼠标down后触发
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* "draggable.move":drag过程中多次触发
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* "draggable.stop":drag结束触发，就是鼠标up后触发
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*/
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//注册draggable组件
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$.zUI.addWidget("draggable",{
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defaults:{
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bOffsetParentBoundary:false,//是否以定位父亲元素为边界
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oBoundary:null,//边界
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fnComputePosition:null//计算位置的函数
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},
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__creator:function(ele){
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var jqEle = $(ele);
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jqEle.data($.zUI.draggable.sEventName,{
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mousedown:function(ev){
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var jqThis = $(this);
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var opts = jqThis.data($.zUI.draggable.sOptsName);
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jqThis.trigger("draggable.start");
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var iOffsetX = ev.pageX - this.offsetLeft;
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var iOffsetY = ev.pageY - this.offsetTop;
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function fnMouseMove (ev) {
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var oPos = {};
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if(opts.fnComputePosition){
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oPos = opts.fnComputePosition(ev,iOffsetX,iOffsetY);
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}else{
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oPos.iLeft = ev.pageX - iOffsetX;
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oPos.iTop = ev.pageY - iOffsetY;
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}
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var oBoundary = opts.oBoundary;
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if(opts.bOffsetParentBoundary){//如果以offsetParent作为边界
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var eParent = jqThis.offsetParent()[0];
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oBoundary = {};
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oBoundary.iMinLeft = 0;
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oBoundary.iMinTop = 0;
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oBoundary.iMaxLeft = eParent.clientWidth - jqThis.outerWidth();
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oBoundary.iMaxTop = eParent.clientHeight - jqThis.outerHeight();
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}
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if(oBoundary){//如果存在oBoundary，将oBoundary作为边界
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oPos.iLeft = oPos.iLeft < oBoundary.iMinLeft ? oBoundary.iMinLeft : oPos.iLeft;
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oPos.iLeft = oPos.iLeft > oBoundary.iMaxLeft ? oBoundary.iMaxLeft : oPos.iLeft;
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oPos.iTop = oPos.iTop < oBoundary.iMinTop ? oBoundary.iMinTop : oPos.iTop;
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oPos.iTop = oPos.iTop > oBoundary.iMaxTop ? oBoundary.iMaxTop : oPos.iTop;
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}
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jqThis.css({left:oPos.iLeft,top:oPos.iTop});
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ev.preventDefault();
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jqThis.trigger("draggable.move");
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}
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var oEvent = {
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mousemove:fnMouseMove,
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mouseup:function(){
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$(document).off(oEvent);
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jqThis.trigger("draggable.stop");
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}
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};
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$(document).on(oEvent);
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}});
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}
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});
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/*
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* panel
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* 参数：obj{
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* iWheelStep:鼠标滑轮滚动时步进长度
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* sBoxClassName:滚动框的样式
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* sBarClassName:滚动条的样式
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* }
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*/
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$.zUI.addWidget("panel",{
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defaults : {
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iWheelStep:16,
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sBoxClassName:"zUIpanelScrollBox",
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sBarClassName:"zUIpanelScrollBar"
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},
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__creator:function(ele){
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var jqThis = $(ele);
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//如果是static定位，加上relative定位
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if(jqThis.css("position") === "static"){
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jqThis.css("position","relative");
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}
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jqThis.css("overflow","hidden");
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//必须有一个唯一的直接子元素,给直接子元素加上绝对定位
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var jqChild = jqThis.children(":first");
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if(jqChild.length){
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jqChild.css({top:0,position:"absolute"});
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}else{
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return;
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}
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var opts = jqThis.data($.zUI.panel.sOptsName);
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//创建滚动框
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var jqScrollBox = $("<div style='position:absolute;display:none;line-height:0;'></div>");
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jqScrollBox.addClass(opts.sBoxClassName);
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//创建滚动条
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var jqScrollBar= $("<div style='position:absolute;display:none;line-height:0;'></div>");
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jqScrollBar.addClass(opts.sBarClassName);
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jqScrollBox.appendTo(jqThis);
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jqScrollBar.appendTo(jqThis);
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opts.iTop = parseInt(jqScrollBox.css("top"));
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opts.iWidth = jqScrollBar.width();
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opts.iRight = parseInt(jqScrollBox.css("right"));
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//添加拖拽触发自定义函数
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jqScrollBar.on("draggable.move",function(){
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var opts = jqThis.data($.zUI.panel.sOptsName);
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fnScrollContent(jqScrollBox,jqScrollBar,jqThis,jqChild,opts.iTop,0);
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});
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//事件对象
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var oEvent ={
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mouseenter:function(){
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fnFreshScroll();
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jqScrollBox.css("display","block");
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jqScrollBar.css("display","block");
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},
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mouseleave:function(){
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jqScrollBox.css("display","none");
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jqScrollBar.css("display","none");
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}
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};
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var sMouseWheel = "mousewheel";
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if(!("onmousewheel" in document)){
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sMouseWheel = "DOMMouseScroll";
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}
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oEvent[sMouseWheel] = function(ev){
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var opts = jqThis.data($.zUI.panel.sOptsName);
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var iWheelDelta = 1;
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ev.preventDefault();//阻止默认事件
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ev = ev.originalEvent;//获取原生的event
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if(ev.wheelDelta){
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iWheelDelta = ev.wheelDelta/120;
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}else{
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iWheelDelta = -ev.detail/3;
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}
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var iMinTop = jqThis.innerHeight() - jqChild.outerHeight();
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//外面比里面高，不需要响应滚动
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if(iMinTop>0){
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jqChild.css("top",0);
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return;
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}
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var iTop = parseInt(jqChild.css("top"));
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var iTop = iTop + opts.iWheelStep*iWheelDelta;
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iTop = iTop > 0 ? 0 : iTop;
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iTop = iTop < iMinTop ? iMinTop : iTop;
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jqChild.css("top",iTop);
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fnScrollContent(jqThis,jqChild,jqScrollBox,jqScrollBar,0,opts.iTop);
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}
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//记录添加事件
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jqThis.data($.zUI.panel.sEventName,oEvent);
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//跟随滚动函数
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function fnScrollContent(jqWrapper,jqContent,jqFollowWrapper,jqFlollowContent,iOffset1,iOffset2){
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var opts = jqThis.data($.zUI.panel.sOptsName);
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var rate = (parseInt(jqContent.css("top"))-iOffset1)/(jqContent.outerHeight()-jqWrapper.innerHeight())//卷起的比率
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var iTop = (jqFlollowContent.outerHeight()-jqFollowWrapper.innerHeight())*rate + iOffset2;
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jqFlollowContent.css("top",iTop);
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}
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//刷新滚动条
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function fnFreshScroll(){
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var opts = jqThis.data($.zUI.panel.sOptsName);
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var iScrollBoxHeight = jqThis.innerHeight()-2*opts.iTop;
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var iRate = jqThis.innerHeight()/jqChild.outerHeight();
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var iScrollBarHeight = iScrollBarHeight = Math.round(iRate*iScrollBoxHeight);
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//如果比率大于等于1，不需要滚动条,自然也不需要添加拖拽事件
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if(iRate >= 1){
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jqScrollBox.css("height",0);
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jqScrollBar.css("height",0);
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return;
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}
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jqScrollBox.css("height",iScrollBoxHeight);
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jqScrollBar.css("height",iScrollBarHeight);
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//计算拖拽边界，添加拖拽事件
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var oBoundary = {iMinTop:opts.iTop};
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oBoundary.iMaxTop = iScrollBoxHeight - Math.round(iRate*iScrollBoxHeight)+opts.iTop;
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oBoundary.iMinLeft = jqThis.innerWidth() - opts.iWidth - opts.iRight;
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oBoundary.iMaxLeft = oBoundary.iMinLeft;
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fnScrollContent(jqThis,jqChild,jqScrollBox,jqScrollBar,0,opts.iTop);
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jqScrollBar.draggable({oBoundary:oBoundary});
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}
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},
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__destroyer:function(ele){
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var jqEle = $(ele);
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if(jqEle.data($.zUI.panel.sFlagName)){
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var opts = jqEle.data($.zUI.panel.sOptsName);
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jqEle.children("."+opts.sBoxClassName).remove();
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jqEle.children("."+opts.sBarClassName).remove();
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}
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}
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});
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$.each($.zUI.asWidget,function(i,widget){
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unWidget = "un"+widget;
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var w = {};
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w[widget] = function(args){
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this.each(function(){
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$.zUI[widget].fn(this,args);
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});
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return this;
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};
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w[unWidget] = function(){
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this.each(function(){
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$.zUI[widget].unfn(this);
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});
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return this;
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}
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$.fn.extend(w);
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});
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})(jQuery);
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