/**************************************************
 * dom-drag.js
 * 09.25.2001
 * www.youngpup.net
 **************************************************
 * 10.28.2001 - fixed minor bug where events
 * sometimes fired off the handle, not the root.
 **************************************************/
var Drag = {
	obj : null,
	init : function(o)
	{
		o.onmousedown   = Drag.start;
		o.ondblclick    = Drag.doDoubleClick;
		
		if (isNaN(parseInt(o.style.left))) o.style.left = "0px";
		if (isNaN(parseInt(o.style.top ))) o.style.top  = "0px";
	},

	start : function(e)
	{
		e = Drag.fixE(e);
    	
    	switch(getEventSource(e).nodeName)
    	{
    		case "INPUT":
    		case "SELECT":
    		case "OPTION":
    			return;
    	}
		
		var o = Drag.obj = this;
		var y = parseInt(o.style.top);
		var x = parseInt(o.style.left);
		var partsbin = getElementAttribute(o, "partsbin");
		var parttype = getElementAttribute(o, "parttype");

		if(parttype && partsbin == "true")
		{
			var newObject = createNewComponent(o, new Point(0,0));
			if(newObject)
	        {
	        	o = Drag.obj = newObject;
	        }
	        else
	        {
	        	return;
	        }
		}
		else
		{
			o = Drag.obj = this;
		}
		o.lastMouseX = e.clientX;
		o.lastMouseY = e.clientY;
		document.onmousemove	= Drag.drag;
		document.onmouseup		= Drag.end;
		return false;
	},

	drag : function(e)
	{
		e = Drag.fixE(e);
		var o = Drag.obj;

		var ey	= e.clientY;
		var ex	= e.clientX;

		var y = parseInt(o.style.top);
		var x = parseInt(o.style.left);
		
		var nx = x + (ex - o.lastMouseX);
		var ny = y + (ey - o.lastMouseY);
		
		Drag.obj.style["left"] = nx + "px";
		Drag.obj.style["top"]  = ny + "px";
		
		Drag.obj.lastMouseX	= ex;
		Drag.obj.lastMouseY	= ey;

		return false;
	},

	end : function()
	{
		var componentRef = globalBreadBoard.find(Drag.obj.id);
		var oLeft = parseInt(Drag.obj.style["left"]);
		var oTop = parseInt(Drag.obj.style["top"]);

		if(componentRef && componentRef.compType != "Note")
		{
			var ofst = getDropOffset(componentRef);
			oLeft += -(ofst.x);
			oTop  += -(ofst.y);
		
			var pt = findLandingXY(oLeft, oTop);
			var ofst = getDropOffset(componentRef);
			if(pt)
			{
				pt.x += ofst.x;
				pt.y += ofst.y;
	
				Drag.obj.style["left"] = pt.x + "px";
				Drag.obj.style["top"]  = pt.y + "px";
			}
		}
		else
		{
			Drag.obj.style["left"] = oLeft;
			Drag.obj.style["top"]  = oTop;
		}
		
		document.onmousemove = null;
		document.onmouseup   = null;
		
		if(componentRef)
		{
			componentRef.x = parseInt(Drag.obj.style["left"]);
			componentRef.y = parseInt(Drag.obj.style["top"]);
		}
		Drag.obj = null;
	},

	fixE : function(e)
	{
		if (typeof e == 'undefined') e = window.event;
		if (typeof e.layerX == 'undefined') e.layerX = e.offsetX;
		if (typeof e.layerY == 'undefined') e.layerY = e.offsetY;
		return e;
	},
	
	doDoubleClick : function(e)
	{
	    openDialog(e);
	}
	
};