scripts/dom-drag.js
author Dan
Fri, 15 Aug 2008 23:31:37 -0400
changeset 33 3b4aef1efff6
parent 10 d3059e20b0fa
permissions -rw-r--r--
Removed requirement for detecting home directory; artwork fetcher relies on return from saveCurrentPlaylist now
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/**************************************************
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 * dom-drag.js
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 * 09.25.2001
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 * www.youngpup.net
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 **************************************************
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 * 10.28.2001 - fixed minor bug where events
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 * sometimes fired off the handle, not the root.
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 **************************************************/
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var Drag = {
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	obj : null,
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	init : function(o, oRoot, minX, maxX, minY, maxY, bSwapHorzRef, bSwapVertRef, fXMapper, fYMapper)
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	{
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		o.onmousedown	= Drag.start;
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		o.hmode			= bSwapHorzRef ? false : true ;
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		o.vmode			= bSwapVertRef ? false : true ;
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		o.root = oRoot && oRoot != null ? oRoot : o ;
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		if (o.hmode  && isNaN(parseInt(o.root.style.left  ))) o.root.style.left   = "0px";
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		if (o.vmode  && isNaN(parseInt(o.root.style.top   ))) o.root.style.top    = "0px";
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		if (!o.hmode && isNaN(parseInt(o.root.style.right ))) o.root.style.right  = "0px";
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		if (!o.vmode && isNaN(parseInt(o.root.style.bottom))) o.root.style.bottom = "0px";
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		o.minX	= typeof minX != 'undefined' ? minX : null;
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		o.minY	= typeof minY != 'undefined' ? minY : null;
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		o.maxX	= typeof maxX != 'undefined' ? maxX : null;
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		o.maxY	= typeof maxY != 'undefined' ? maxY : null;
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		o.xMapper = fXMapper ? fXMapper : null;
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		o.yMapper = fYMapper ? fYMapper : null;
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		o.root.onDragStart	= new Function();
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		o.root.onDragEnd	= new Function();
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		o.root.onDrag		= new Function();
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	},
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	start : function(e)
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	{
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		var o = Drag.obj = this;
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		e = Drag.fixE(e);
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		var y = parseInt(o.vmode ? o.root.style.top  : o.root.style.bottom);
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		var x = parseInt(o.hmode ? o.root.style.left : o.root.style.right );
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		o.root.onDragStart(x, y);
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		o.lastMouseX	= e.clientX;
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		o.lastMouseY	= e.clientY;
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		if (o.hmode) {
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			if (o.minX != null)	o.minMouseX	= e.clientX - x + o.minX;
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			if (o.maxX != null)	o.maxMouseX	= o.minMouseX + o.maxX - o.minX;
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		} else {
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			if (o.minX != null) o.maxMouseX = -o.minX + e.clientX + x;
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			if (o.maxX != null) o.minMouseX = -o.maxX + e.clientX + x;
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		}
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		if (o.vmode) {
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			if (o.minY != null)	o.minMouseY	= e.clientY - y + o.minY;
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			if (o.maxY != null)	o.maxMouseY	= o.minMouseY + o.maxY - o.minY;
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		} else {
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			if (o.minY != null) o.maxMouseY = -o.minY + e.clientY + y;
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			if (o.maxY != null) o.minMouseY = -o.maxY + e.clientY + y;
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		}
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		document.onmousemove	= Drag.drag;
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		document.onmouseup		= Drag.end;
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		return false;
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	},
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	drag : function(e)
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	{
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		e = Drag.fixE(e);
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		var o = Drag.obj;
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		var ey	= e.clientY;
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		var ex	= e.clientX;
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		var y = parseInt(o.vmode ? o.root.style.top  : o.root.style.bottom);
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		var x = parseInt(o.hmode ? o.root.style.left : o.root.style.right );
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		var nx, ny;
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		if (o.minX != null) ex = o.hmode ? Math.max(ex, o.minMouseX) : Math.min(ex, o.maxMouseX);
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		if (o.maxX != null) ex = o.hmode ? Math.min(ex, o.maxMouseX) : Math.max(ex, o.minMouseX);
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		if (o.minY != null) ey = o.vmode ? Math.max(ey, o.minMouseY) : Math.min(ey, o.maxMouseY);
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		if (o.maxY != null) ey = o.vmode ? Math.min(ey, o.maxMouseY) : Math.max(ey, o.minMouseY);
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		nx = x + ((ex - o.lastMouseX) * (o.hmode ? 1 : -1));
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		ny = y + ((ey - o.lastMouseY) * (o.vmode ? 1 : -1));
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		if (o.xMapper)		nx = o.xMapper(y)
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		else if (o.yMapper)	ny = o.yMapper(x)
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		Drag.obj.root.style[o.hmode ? "left" : "right"] = nx + "px";
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		Drag.obj.root.style[o.vmode ? "top" : "bottom"] = ny + "px";
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		Drag.obj.lastMouseX	= ex;
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		Drag.obj.lastMouseY	= ey;
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		Drag.obj.root.onDrag(nx, ny);
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		return false;
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	},
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	end : function()
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	{
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		document.onmousemove = null;
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		document.onmouseup   = null;
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		Drag.obj.root.onDragEnd(	parseInt(Drag.obj.root.style[Drag.obj.hmode ? "left" : "right"]), 
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									parseInt(Drag.obj.root.style[Drag.obj.vmode ? "top" : "bottom"]));
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		Drag.obj = null;
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	},
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	fixE : function(e)
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	{
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		if (typeof e == 'undefined') e = window.event;
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		if (typeof e.layerX == 'undefined') e.layerX = e.offsetX;
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		if (typeof e.layerY == 'undefined') e.layerY = e.offsetY;
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		return e;
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	}
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};