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/**
* Makes a DOM object draggable
*
* This is currently for movable DOM dialogs only. If needed it could be
* extended to execute callbacks on special events...
*
* @link http://nofunc.org/Drag_Drop/
*/
var drag = {
obj: null,
handle: null,
oX: 0, // object X position
oY: 0, // object Y position
eX: 0, // event X delta
eY: 0, // event Y delta
/**
* Attaches the needed handlers to the given object
*
* This can be called for multiple objects, the right one is later
* determined from the event itself. The handle is optional
*
* @param DOMObject obj The object that should be draggable
* @param DOMObject handle A handle on which the obj can be dragged
*/
attach: function (obj,handle) {
if(handle){
handle.dragobject = obj;
addEvent(DOKUid(handle),'mousedown',drag.start);
}else{
addEvent(DOKUid(obj),'mousedown',drag.start);
}
},
/**
* Starts the dragging operation
*/
start: function (e){
drag.handle = e.target;
if(drag.handle.dragobject){
drag.obj = drag.handle.dragobject;
}else{
drag.obj = drag.handle;
}
drag.handle.className += ' ondrag';
drag.obj.className += ' ondrag';
drag.oX = parseInt(drag.obj.style.left);
drag.oY = parseInt(drag.obj.style.top);
drag.eX = drag.evX(e);
drag.eY = drag.evY(e);
addEvent(document,'mousemove',drag.drag);
addEvent(document,'mouseup',drag.stop);
e.preventDefault();
e.stopPropagation();
return false;
},
/**
* Ends the dragging operation
*/
stop: function(){
drag.handle.className = drag.handle.className.replace(/ ?ondrag/,'');
drag.obj.className = drag.obj.className.replace(/ ?ondrag/,'');
removeEvent(document,'mousemove',drag.drag);
removeEvent(document,'mouseup',drag.stop);
drag.obj = null;
drag.handle = null;
},
/**
* Moves the object during the dragging operation
*/
drag: function(e) {
if(drag.obj) {
drag.obj.style.top = (drag.evY(e)+drag.oY-drag.eY+'px');
drag.obj.style.left = (drag.evX(e)+drag.oX-drag.eX+'px');
}
},
/**
* Returns the X position of the given event.
*/
evX: function(e){
return (e.pageX) ? e.pageX : e.clientX + document.body.scrollTop; //fixme shouldn't this be scrollLeft?
},
/**
* Returns the Y position of the given event.
*/
evY: function(e){
return (e.pageY) ? e.pageY : e.clientY + document.body.scrollTop;
}
};
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