root / trunk / web / dojo / dojox / mdnd / AutoScroll.js
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/*
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Copyright (c) 2004-2010, The Dojo Foundation All Rights Reserved.
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Available via Academic Free License >= 2.1 OR the modified BSD license.
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see: http://dojotoolkit.org/license for details
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*/
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if(!dojo._hasResource["dojox.mdnd.AutoScroll"]){ |
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dojo._hasResource["dojox.mdnd.AutoScroll"]=true; |
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dojo.provide("dojox.mdnd.AutoScroll");
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dojo.declare("dojox.mdnd.AutoScroll",null,{interval:3,recursiveTimer:10,marginMouse:50,constructor:function(){ |
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this.resizeHandler=dojo.connect(dojo.global,"onresize",this,function(){ |
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this.getViewport();
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}); |
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dojo.ready(dojo.hitch(this,"init")); |
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},init:function(){ |
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this._html=(dojo.isWebKit)?dojo.body():dojo.body().parentNode;
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this.getViewport();
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},getViewport:function(){ |
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var d=dojo.doc,dd=d.documentElement,w=window,b=dojo.body();
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if(dojo.isMozilla){
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this._v={"w":dd.clientWidth,"h":w.innerHeight}; |
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}else{
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if(!dojo.isOpera&&w.innerWidth){
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this._v={"w":w.innerWidth,"h":w.innerHeight}; |
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}else{
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if(!dojo.isOpera&&dd&&dd.clientWidth){
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this._v={"w":dd.clientWidth,"h":dd.clientHeight}; |
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}else{
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if(b.clientWidth){
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this._v={"w":b.clientWidth,"h":b.clientHeight}; |
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} |
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} |
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} |
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} |
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},setAutoScrollNode:function(_1){ |
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this._node=_1;
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},setAutoScrollMaxPage:function(){ |
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this._yMax=this._html.scrollHeight; |
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this._xMax=this._html.scrollWidth; |
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},checkAutoScroll:function(e){ |
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if(this._autoScrollActive){ |
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this.stopAutoScroll();
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} |
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this._y=e.pageY;
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this._x=e.pageX;
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if(e.clientX<this.marginMouse){ |
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this._autoScrollActive=true; |
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this._autoScrollLeft(e);
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}else{
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if(e.clientX>this._v.w-this.marginMouse){ |
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this._autoScrollActive=true; |
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this._autoScrollRight(e);
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} |
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} |
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if(e.clientY<this.marginMouse){ |
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this._autoScrollActive=true; |
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this._autoScrollUp(e);
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}else{
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if(e.clientY>this._v.h-this.marginMouse){ |
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this._autoScrollActive=true; |
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this._autoScrollDown();
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} |
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} |
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},_autoScrollDown:function(){ |
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if(this._timer){ |
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clearTimeout(this._timer);
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} |
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if(this._autoScrollActive&&this._y+this.marginMouse<this._yMax){ |
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this._html.scrollTop+=this.interval; |
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this._node.style.top=(parseInt(this._node.style.top)+this.interval)+"px"; |
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this._y+=this.interval; |
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this._timer=setTimeout(dojo.hitch(this,"_autoScrollDown"),this.recursiveTimer); |
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} |
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},_autoScrollUp:function(){ |
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if(this._timer){ |
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clearTimeout(this._timer);
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} |
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if(this._autoScrollActive&&this._y-this.marginMouse>0){ |
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this._html.scrollTop-=this.interval; |
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this._node.style.top=(parseInt(this._node.style.top)-this.interval)+"px"; |
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this._y-=this.interval; |
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this._timer=setTimeout(dojo.hitch(this,"_autoScrollUp"),this.recursiveTimer); |
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} |
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},_autoScrollRight:function(){ |
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if(this._timer){ |
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clearTimeout(this._timer);
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} |
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if(this._autoScrollActive&&this._x+this.marginMouse<this._xMax){ |
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this._html.scrollLeft+=this.interval; |
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this._node.style.left=(parseInt(this._node.style.left)+this.interval)+"px"; |
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this._x+=this.interval; |
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this._timer=setTimeout(dojo.hitch(this,"_autoScrollRight"),this.recursiveTimer); |
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} |
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},_autoScrollLeft:function(e){ |
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if(this._timer){ |
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clearTimeout(this._timer);
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} |
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if(this._autoScrollActive&&this._x-this.marginMouse>0){ |
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this._html.scrollLeft-=this.interval; |
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this._node.style.left=(parseInt(this._node.style.left)-this.interval)+"px"; |
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this._x-=this.interval; |
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this._timer=setTimeout(dojo.hitch(this,"_autoScrollLeft"),this.recursiveTimer); |
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} |
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},stopAutoScroll:function(){ |
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if(this._timer){ |
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clearTimeout(this._timer);
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} |
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this._autoScrollActive=false; |
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},destroy:function(){ |
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dojo.disconnect(this.resizeHandler);
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}}); |
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dojox.mdnd.autoScroll=null;
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(function(){
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dojox.mdnd.autoScroll=new dojox.mdnd.AutoScroll();
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}()); |
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} |