/***
*	A huge thanks to Dean Parkinson for the help with this widget
*/
/************************************************************************************************************
@fileoverview
Slide out menu
Copyright (C) 2007  Dean Parkinson

This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.

This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA

Alf Magne Kalleland, 2007
Owner of DHTMLgoodies.com


************************************************************************************************************/	
var __bv = parseInt(navigator.userAgent.replace(/.*?MSIE ([0-9]+?)[^0-9].*/g,'$1'));
var slideoutMenu = {
	"menuDiv": "menu",
	"submenuClass": "submenu",
	"menuSubmenuClass": "menu_sub",
	"menuSubmenuImage": "",
	"slideSpeed_out": 10,	// Steps to move sub menu at a time ( higher = faster)
	"slideSpeed_in": 10,
	"delayMenuClose": 150,	// Microseconds from mouseout to close of menu
	"slideTimeout_out": 25,	// Microseconds between slide steps ( lower = faster)
	"slideTimeout_in": 10,	// Microseconds between slide steps ( lower = faster)
	"xOffsetSubMenu": 0, 	// Offset x-position of sub menu items - use negative value if you want the sub menu to overlap main menu
	"extrapadding": 0, // Extra padding in each menu item to make it wider

/* Don't change anything below here */

	"menuItems": null,
	"indices": [0],
	"isMSIE": navigator.userAgent.indexOf('MSIE')>=0?true:false,
	"browserVersion": __bv ? __bv : 1,
	"mouseOn": function(obj)
	{
		var mi = this.findNode(this.getSearchIdFromObj(obj));
		if (mi) mi.mouseOn();
	},
	"mouseOff": function(obj)
	{
		var mi = this.findNode(this.getSearchIdFromObj(obj));
		if (mi) mi.mouseOff();
	},
	"getSearchIdFromObj": function(obj)
	{
		// pull the postfix off the A link or LI tag id and return the menu item ID
		var objId = obj.id;
		var idx = objId.indexOf('_');
		if (idx>=0)
			return "MenuItem" + objId.substring(idx);
		else
			return null;
	},
	"slideChildMenu": function(aId){
		var mi = this.findNode(aId);
		if (mi) mi.slideChildMenu();
	},
	"findNode": function(searchId)
	{
		var result;
		for (var no=0;no<this.menuItems.length;no++)
		{
			result = this.menuItems[no].findNode(searchId);
			if (result) return result;
		}
		return null;
	},
	"getNextIndex": function(lvl)
	{
		var result = 0;
		if (this.indices.length<=lvl)
			this.indices[lvl] = 1;
		else
		{
			result = this.indices[lvl];
			this.indices[lvl]++;
		}
		return result;
	},
	"collectMenuNodes": function(menuObj)
	{
		var results = [];
		var menuUL;
		var menuLI;

		if (!menuObj) return null;

		menuUL = menuObj.getElementsByTagName('UL')[0];
		menuLI = menuUL.getElementsByTagName('LI')[0];
		while (menuLI)
		{
			if (menuLI.tagName && menuLI.tagName.toLowerCase()=='li')
	      results[results.length] = new MenuItem(menuObj, menuUL, menuLI, 0, null, this.extrapadding);
			menuLI = menuLI.nextSibling;
		}
		return results;
	},
	"initMenu": function(parms)
	{
		var mainDiv;

		parms = parms || {};
		for (var x in parms)
			this[x] = parms[x];

		mainDiv = document.getElementById(slideoutMenu.menuDiv);
		this.menuItems = this.collectMenuNodes(mainDiv);
		if (this.menuItems)
		{
			for (var no=0;no<this.menuItems.length;no++)
			{
				var mi = this.menuItems[no];
				mi.renderNode();
			}
			mainDiv.style.visibility = 'visible';
		}
		// window.onresize = resetPosition;
	}
};

function MenuItem(divref, ulref, liref, lvlnum, parentref, extrapadding)
{
	this.parent = parentref;
	this.div = divref;
	this.ul = ulref;
	this.width = this.ul.offsetWidth;
	this.extrapadding = extrapadding;
	// this.left = div.style.left.replace(/[^0-9]/g,'');
	this.li = liref;
	this.alink = this.li.getElementsByTagName('A')[0];
	this.lvl = lvlnum;
	this.idx = slideoutMenu.getNextIndex(this.lvl);
	this.children;
	this.subUL = this.li.getElementsByTagName('UL')[0];
	this.children;
	this.isMouseOnMe = false;
	// note: if !isOpen && !isClosed then I am animating a slide
	this.isChildMenuOpen = false;
	this.isChildMenuClosed = true;

	var linkimg;

	// Constructor
	// if a node does not have an A tag but its children do then we need
	// to null out this node's alink field...
	if (this.alink)
	{
		if (this.alink.parentNode!=this.li) this.alink = null;
	}
	if (this.subUL)
	{
		this.children = new Array();
		var subLI = this.subUL.getElementsByTagName('LI')[0];
		while(subLI)
		{
			if(subLI.tagName && subLI.tagName.toLowerCase()=='li')
				this.children[this.children.length] = new MenuItem(null, this.subUL, subLI, this.lvl + 1, this, this.extrapadding);
			subLI = subLI.nextSibling;
		}
		this.alink.className = slideoutMenu.menuSubmenuClass;
		if ("" != slideoutMenu.menuSubmenuImage)
		{
			linkimg = document.createElement("img");
			linkimg.src = slideoutMenu.menuSubmenuImage;
			linkimg.alt = "";
			this.alink.appendChild(linkimg);
		}
	}

	this.getPostfix = function()
	{
		return '_' + this.idx + '_' + this.lvl;
	}

	this.getId = function()
	{
		return "MenuItem" + this.getPostfix();
	}

	this.hasChildren = function()
	{
		return (this.children!=null);
	}

	this.getTopPos = function()
	{
		var origDisp = this.div.style.display;
		this.div.style.display = "";
		var obj = this.li;
		var result = obj.offsetTop;
		while((obj = obj.offsetParent) != null) result += obj.offsetTop;
		this.div.style.display = origDisp;
		return result;
	}

	this.getLeftPos = function()
	{
		var origDisp = this.div.style.display;
		this.div.style.display = "";
		var obj = this.li;
		var result = obj.offsetLeft;
		while((obj = obj.offsetParent) != null) result += obj.offsetLeft;
		this.div.style.display = origDisp;
		return result;
	}

	this.renderNode = function()
	{
		// set node properties
		this.li.id = "menuItemLI" + this.getPostfix();
		this.ul.style.position = "relative";
		if (this.alink)
		{
			this.alink.id = "menuItemA" + this.getPostfix();
			this.alink.onmouseover = function() {slideoutMenu.mouseOn(this);};
			this.alink.onmouseout = function() {slideoutMenu.mouseOff(this);};
		}
		else
		{
			this.li.onmouseover = function() {slideoutMenu.mouseOn(this);};
			this.li.onmouseout = function() {slideoutMenu.mouseOff(this);};
		}

		// set sub-menu nodes
		if (this.hasChildren())
		{
			var mi = this.children[0];
			var subdiv = document.createElement('DIV');
			var padding = 0;
			if (this.lvl > 0) padding = Number(this.extrapadding);
			subdiv.className=slideoutMenu.submenuClass;
			document.body.appendChild(subdiv);
			subdiv.id = "menuItemDIV" + mi.getPostfix();
			this.subUL.id = "menuItemUL" + mi.getPostfix();
			subdiv.appendChild(this.subUL);
			subdiv.style.left = this.getLeftPos() + this.width + padding + slideoutMenu.xOffsetSubMenu + 'px';
			subdiv.style.top = this.getTopPos() + 'px';
			subdiv.style.visibility = "hidden";
			subdiv.style.display = "none";
			subdiv.style.zindex = "1000";
			for (var no=0;no<this.children.length;no++) {
				var mi = this.children[no];
				mi.div = subdiv;
				mi.renderNode();
			}
		}
		return this.li;
	}

	this.findNode = function(searchId)
	{
		var result;
		if (this.getId() == searchId)
			result = this;
		else
		{
			if (this.hasChildren())
			{
				for (var no=0;no<this.children.length;no++)
				{
					var mi = this.children[no];
					result = mi.findNode(searchId);
					if (result!=null) break;
				}
			}
		}
		return result;
	}

	this.mouseOn = function()
	{
		this.isMouseOnMe = true;
		if (this.hasChildren() && this.isChildMenuClosed)
			this.initiateChildMenuOpen();
	}

	this.mouseOff = function()
	{
		this.isMouseOnMe = false;
		if (this.hasChildren() && !this.isChildMenuClosed)
			this.initiateChildMenuClose();
		else if (this.parent)
			this.parent.mouseOff();
	}

	this.isMouseOnChild = function()
	{
		if (this.isMouseOnMe) return true;
		if (this.hasChildren())
		{
			for (var no=0;no<this.children.length;no++)
			{
				if (this.children[no].isMouseOnChild()) return true;
			}
		}
		return false;
	}

	this.initiateChildMenuOpen = function()
	{
		this.isChildMenuClosed = false;
		var childDiv = this.children[0].div;
		childDiv.style.width = "0px";
		childDiv.style.visibility = "visible";
		childDiv.style.display = "";
		this.slideChildMenu();
	}

	this.initiateChildMenuClose = function()
	{
		this.isChildMenuOpen = false;
		// we have to wait to close the menu
		// allow the mouse to navigate over the child menu
		setTimeout("slideoutMenu.slideChildMenu('" + this.getId() + "')", slideoutMenu.delayMenuClose);
	}

	this.slideChildMenu = function()
	{
		var divref = this.children[0].div;
		var ulref = this.children[0].ul;
		var maxwidth = this.children[0].width + 25;
		var nextWidth;
		if (this.isMouseOnMe  || this.isMouseOnChild())
		{
			nextWidth = divref.offsetWidth + slideoutMenu.slideSpeed_out;
			if (nextWidth >= maxwidth)
				this.finishOpeningChild(divref, ulref, maxwidth);
			else
			{
				ulref.style.left = nextWidth - maxwidth + "px";
				divref.style.width = nextWidth + "px";
				setTimeout("slideoutMenu.slideChildMenu('" + this.getId() + "')", slideoutMenu.slideTimeout_out);
			}
		}
		else
		{
			nextWidth = divref.offsetWidth - slideoutMenu.slideSpeed_in;
			if (nextWidth <= 0)
				this.finishClosingChild(divref, ulref, maxwidth);
			else
			{
				ulref.style.left = nextWidth - maxwidth + "px";
				divref.style.width = nextWidth + "px";
				setTimeout("slideoutMenu.slideChildMenu('" + this.getId() + "')", slideoutMenu.slideTimeout_out);
			}
		}
	}

	this.finishOpeningChild = function(divref, ulref, maxwidth)
	{
		this.isChildMenuOpen = true;
		this.isChildMenuClosed = false;
		ulref.style.left = "0px";
		divref.style.width = maxwidth + "px";
	}

	this.finishClosingChild = function(divref, ulref, maxwidth)
	{
		this.isChildMenuOpen = false;
		this.isChildMenuClosed = true;
		divref.style.visibility = "hidden";
		divref.style.display = "none";
		divref.style.width = maxwidth + "px";
		if (this.parent) this.parent.mouseOff();
	}
}