/*
	Copyright (c) 2004-2012, The Dojo Foundation All Rights Reserved.
	Available via Academic Free License >= 2.1 OR the modified BSD license.
	see: http://dojotoolkit.org/license for details
*/

//>>built
define("dojo/dnd/autoscroll",["../_base/lang","../sniff","../_base/window","../dom-geometry","../dom-style","../window"],function(_1,_2,_3,_4,_5,_6){var _7={};_1.setObject("dojo.dnd.autoscroll",_7);_7.getViewport=_6.getBox;_7.V_TRIGGER_AUTOSCROLL=32;_7.H_TRIGGER_AUTOSCROLL=32;_7.V_AUTOSCROLL_VALUE=16;_7.H_AUTOSCROLL_VALUE=16;var _8,_9=_3.doc,_a=Infinity,_b=Infinity;_7.autoScrollStart=function(d){_9=d;_8=_6.getBox(_9);var _c=_3.body(_9).parentNode;_a=Math.max(_c.scrollHeight-_8.h,0);_b=Math.max(_c.scrollWidth-_8.w,0);};_7.autoScroll=function(e){var v=_8||_6.getBox(_9),_d=_3.body(_9).parentNode,dx=0,dy=0;if(e.clientX<_7.H_TRIGGER_AUTOSCROLL){dx=-_7.H_AUTOSCROLL_VALUE;}else{if(e.clientX>v.w-_7.H_TRIGGER_AUTOSCROLL){dx=Math.min(_7.H_AUTOSCROLL_VALUE,_b-_d.scrollLeft);}}if(e.clientY<_7.V_TRIGGER_AUTOSCROLL){dy=-_7.V_AUTOSCROLL_VALUE;}else{if(e.clientY>v.h-_7.V_TRIGGER_AUTOSCROLL){dy=Math.min(_7.V_AUTOSCROLL_VALUE,_a-_d.scrollTop);}}window.scrollBy(dx,dy);};_7._validNodes={"div":1,"p":1,"td":1};_7._validOverflow={"auto":1,"scroll":1};_7.autoScrollNodes=function(e){var b,t,w,h,rx,ry,dx=0,dy=0,_e,_f;for(var n=e.target;n;){if(n.nodeType==1&&(n.tagName.toLowerCase() in _7._validNodes)){var s=_5.getComputedStyle(n),_10=(s.overflow.toLowerCase() in _7._validOverflow),_11=(s.overflowX.toLowerCase() in _7._validOverflow),_12=(s.overflowY.toLowerCase() in _7._validOverflow);if(_10||_11||_12){b=_4.getContentBox(n,s);t=_4.position(n,true);}if(_10||_11){w=Math.min(_7.H_TRIGGER_AUTOSCROLL,b.w/2);rx=e.pageX-t.x;if(_2("webkit")||_2("opera")){rx+=_3.body().scrollLeft;}dx=0;if(rx>0&&rx<b.w){if(rx<w){dx=-w;}else{if(rx>b.w-w){dx=w;}}_e=n.scrollLeft;n.scrollLeft=n.scrollLeft+dx;}}if(_10||_12){h=Math.min(_7.V_TRIGGER_AUTOSCROLL,b.h/2);ry=e.pageY-t.y;if(_2("webkit")||_2("opera")){ry+=_3.body().scrollTop;}dy=0;if(ry>0&&ry<b.h){if(ry<h){dy=-h;}else{if(ry>b.h-h){dy=h;}}_f=n.scrollTop;n.scrollTop=n.scrollTop+dy;}}if(dx||dy){return;}}try{n=n.parentNode;}catch(x){n=null;}}_7.autoScroll(e);};return _7;});