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100 lines
2.2 KiB
JavaScript
100 lines
2.2 KiB
JavaScript
14 years ago
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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["dojo.dnd.autoscroll"]){
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dojo._hasResource["dojo.dnd.autoscroll"]=true;
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dojo.provide("dojo.dnd.autoscroll");
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dojo.dnd.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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return {w:dd.clientWidth,h:w.innerHeight};
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}else{
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if(!dojo.isOpera&&w.innerWidth){
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return {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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return {w:dd.clientWidth,h:dd.clientHeight};
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}else{
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if(b.clientWidth){
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return {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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return null;
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};
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dojo.dnd.V_TRIGGER_AUTOSCROLL=32;
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dojo.dnd.H_TRIGGER_AUTOSCROLL=32;
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dojo.dnd.V_AUTOSCROLL_VALUE=16;
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dojo.dnd.H_AUTOSCROLL_VALUE=16;
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dojo.dnd.autoScroll=function(e){
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var v=dojo.dnd.getViewport(),dx=0,dy=0;
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if(e.clientX<dojo.dnd.H_TRIGGER_AUTOSCROLL){
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dx=-dojo.dnd.H_AUTOSCROLL_VALUE;
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}else{
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if(e.clientX>v.w-dojo.dnd.H_TRIGGER_AUTOSCROLL){
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dx=dojo.dnd.H_AUTOSCROLL_VALUE;
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}
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}
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if(e.clientY<dojo.dnd.V_TRIGGER_AUTOSCROLL){
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dy=-dojo.dnd.V_AUTOSCROLL_VALUE;
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}else{
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if(e.clientY>v.h-dojo.dnd.V_TRIGGER_AUTOSCROLL){
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dy=dojo.dnd.V_AUTOSCROLL_VALUE;
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}
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}
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window.scrollBy(dx,dy);
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};
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dojo.dnd._validNodes={"div":1,"p":1,"td":1};
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dojo.dnd._validOverflow={"auto":1,"scroll":1};
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dojo.dnd.autoScrollNodes=function(e){
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for(var n=e.target;n;){
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if(n.nodeType==1&&(n.tagName.toLowerCase() in dojo.dnd._validNodes)){
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var s=dojo.getComputedStyle(n);
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if(s.overflow.toLowerCase() in dojo.dnd._validOverflow){
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var b=dojo._getContentBox(n,s),t=dojo.position(n,true);
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var w=Math.min(dojo.dnd.H_TRIGGER_AUTOSCROLL,b.w/2),h=Math.min(dojo.dnd.V_TRIGGER_AUTOSCROLL,b.h/2),rx=e.pageX-t.x,ry=e.pageY-t.y,dx=0,dy=0;
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if(dojo.isWebKit||dojo.isOpera){
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rx+=dojo.body().scrollLeft,ry+=dojo.body().scrollTop;
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}
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if(rx>0&&rx<b.w){
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if(rx<w){
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dx=-w;
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}else{
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if(rx>b.w-w){
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dx=w;
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}
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}
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}
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if(ry>0&&ry<b.h){
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if(ry<h){
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dy=-h;
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}else{
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if(ry>b.h-h){
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dy=h;
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}
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}
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}
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var _1=n.scrollLeft,_2=n.scrollTop;
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n.scrollLeft=n.scrollLeft+dx;
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n.scrollTop=n.scrollTop+dy;
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if(_1!=n.scrollLeft||_2!=n.scrollTop){
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return;
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}
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}
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}
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try{
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n=n.parentNode;
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}
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catch(x){
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n=null;
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}
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}
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dojo.dnd.autoScroll(e);
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};
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}
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