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define("dojo/dnd/autoscroll", ["../main", "../window"], function(dojo) {
// module:
// dojo/dnd/autoscroll
// summary:
// TODOC
dojo.getObject("dnd", true, dojo);
dojo.dnd.getViewport = dojo.window.getBox;
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){
// summary:
// a handler for onmousemove event, which scrolls the window, if
// necesary
// e: Event
// onmousemove event
// FIXME: needs more docs!
var v = dojo.window.getBox(), 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){
// summary:
// a handler for onmousemove event, which scrolls the first avaialble
// Dom element, it falls back to dojo.dnd.autoScroll()
// e: Event
// onmousemove event
// FIXME: needs more docs!
var b, t, w, h, rx, ry, dx = 0, dy = 0, oldLeft, oldTop;
for(var n = e.target; n;){
if(n.nodeType == 1 && (n.tagName.toLowerCase() in dojo.dnd._validNodes)){
var s = dojo.getComputedStyle(n),
overflow = (s.overflow.toLowerCase() in dojo.dnd._validOverflow),
overflowX = (s.overflowX.toLowerCase() in dojo.dnd._validOverflow),
overflowY = (s.overflowY.toLowerCase() in dojo.dnd._validOverflow);
if(overflow || overflowX || overflowY){
b = dojo._getContentBox(n, s);
t = dojo.position(n, true);
}
// overflow-x
if(overflow || overflowX){
w = Math.min(dojo.dnd.H_TRIGGER_AUTOSCROLL, b.w / 2);
rx = e.pageX - t.x;
if(dojo.isWebKit || dojo.isOpera){
// FIXME: this code should not be here, it should be taken into account
// either by the event fixing code, or the dojo.position()
// FIXME: this code doesn't work on Opera 9.5 Beta
rx += dojo.body().scrollLeft;
}
dx = 0;
if(rx > 0 && rx < b.w){
if(rx < w){
dx = -w;
}else if(rx > b.w - w){
dx = w;
}
oldLeft = n.scrollLeft;
n.scrollLeft = n.scrollLeft + dx;
}
}
// overflow-y
if(overflow || overflowY){
//console.log(b.l, b.t, t.x, t.y, n.scrollLeft, n.scrollTop);
h = Math.min(dojo.dnd.V_TRIGGER_AUTOSCROLL, b.h / 2);
ry = e.pageY - t.y;
if(dojo.isWebKit || dojo.isOpera){
// FIXME: this code should not be here, it should be taken into account
// either by the event fixing code, or the dojo.position()
// FIXME: this code doesn't work on Opera 9.5 Beta
ry += dojo.body().scrollTop;
}
dy = 0;
if(ry > 0 && ry < b.h){
if(ry < h){
dy = -h;
}else if(ry > b.h - h){
dy = h;
}
oldTop = n.scrollTop;
n.scrollTop = n.scrollTop + dy;
}
}
if(dx || dy){ return; }
}
try{
n = n.parentNode;
}catch(x){
n = null;
}
}
dojo.dnd.autoScroll(e);
};
return dojo.dnd;
});
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