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tt-rss/lib/dojo/dnd/autoscroll.js

100 lines
2.2 KiB
JavaScript

/*
Copyright (c) 2004-2010, 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
*/
if(!dojo._hasResource["dojo.dnd.autoscroll"]){
dojo._hasResource["dojo.dnd.autoscroll"]=true;
dojo.provide("dojo.dnd.autoscroll");
dojo.dnd.getViewport=function(){
var d=dojo.doc,dd=d.documentElement,w=window,b=dojo.body();
if(dojo.isMozilla){
return {w:dd.clientWidth,h:w.innerHeight};
}else{
if(!dojo.isOpera&&w.innerWidth){
return {w:w.innerWidth,h:w.innerHeight};
}else{
if(!dojo.isOpera&&dd&&dd.clientWidth){
return {w:dd.clientWidth,h:dd.clientHeight};
}else{
if(b.clientWidth){
return {w:b.clientWidth,h:b.clientHeight};
}
}
}
}
return null;
};
dojo.dnd.V_TRIGGER_AUTOSCROLL=32;
dojo.dnd.H_TRIGGER_AUTOSCROLL=32;
dojo.dnd.V_AUTOSCROLL_VALUE=16;
dojo.dnd.H_AUTOSCROLL_VALUE=16;
dojo.dnd.autoScroll=function(e){
var v=dojo.dnd.getViewport(),dx=0,dy=0;
if(e.clientX<dojo.dnd.H_TRIGGER_AUTOSCROLL){
dx=-dojo.dnd.H_AUTOSCROLL_VALUE;
}else{
if(e.clientX>v.w-dojo.dnd.H_TRIGGER_AUTOSCROLL){
dx=dojo.dnd.H_AUTOSCROLL_VALUE;
}
}
if(e.clientY<dojo.dnd.V_TRIGGER_AUTOSCROLL){
dy=-dojo.dnd.V_AUTOSCROLL_VALUE;
}else{
if(e.clientY>v.h-dojo.dnd.V_TRIGGER_AUTOSCROLL){
dy=dojo.dnd.V_AUTOSCROLL_VALUE;
}
}
window.scrollBy(dx,dy);
};
dojo.dnd._validNodes={"div":1,"p":1,"td":1};
dojo.dnd._validOverflow={"auto":1,"scroll":1};
dojo.dnd.autoScrollNodes=function(e){
for(var n=e.target;n;){
if(n.nodeType==1&&(n.tagName.toLowerCase() in dojo.dnd._validNodes)){
var s=dojo.getComputedStyle(n);
if(s.overflow.toLowerCase() in dojo.dnd._validOverflow){
var b=dojo._getContentBox(n,s),t=dojo.position(n,true);
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;
if(dojo.isWebKit||dojo.isOpera){
rx+=dojo.body().scrollLeft,ry+=dojo.body().scrollTop;
}
if(rx>0&&rx<b.w){
if(rx<w){
dx=-w;
}else{
if(rx>b.w-w){
dx=w;
}
}
}
if(ry>0&&ry<b.h){
if(ry<h){
dy=-h;
}else{
if(ry>b.h-h){
dy=h;
}
}
}
var _1=n.scrollLeft,_2=n.scrollTop;
n.scrollLeft=n.scrollLeft+dx;
n.scrollTop=n.scrollTop+dy;
if(_1!=n.scrollLeft||_2!=n.scrollTop){
return;
}
}
}
try{
n=n.parentNode;
}
catch(x){
n=null;
}
}
dojo.dnd.autoScroll(e);
};
}