/*****************************************************
 * ypSlideOutMenu
 * http://ypslideoutmenus.sourceforge.net/
 * 3/04/2001
 *
 * a nice little script to create exclusive, slide-out
 * menus for ns4, ns6, mozilla, opera, ie4, ie5 on
 * mac and win32. I've got no linux or unix to test on but
 * it should(?) work...
 *
 * Licensed under AFL 2.0
 * http://www.opensource.org/licenses/afl-2.0.php
 *
 * Revised:
 * - 08/29/2002 : added .hideAll()
 * - 04/15/2004 : added .writeCSS() to support more
 *                than 30 menus.
 *
 * --youngpup--
 *****************************************************/

ypSlideOutMenu.Registry = [];
ypSlideOutMenu.aniLen = 250;
ypSlideOutMenu.hideDelay = 250;
ypSlideOutMenu.minCPUResolution = 10;
ypSlideOutMenu.menusLoaded = false;

// find the absolute x position of an object
function findPosX(obj)
{
    var curleft = 0;
    if (obj.offsetParent)
    {
        while (obj.offsetParent)
        {
            curleft += obj.offsetLeft;
            obj = obj.offsetParent;
        }
    }
    else if (obj.x)
    {
        curleft += obj.x;
    }
    return curleft;
}

// find the absolute y position of an object
function findPosY(obj)
{
    var curtop = 0;
    if (obj.offsetParent)
    {
        while (obj.offsetParent)
        {
            curtop += obj.offsetTop;
            obj = obj.offsetParent;
        }
    }
    else if (obj.y)
    {
        curtop += obj.y;
    }
    return curtop;
}

// reposition the floating menu
function repositionMenu(menu, leftElement, topElement)
{
    var m = document.getElementById(leftElement);
    var x = findPosX(m);
    var n = document.getElementById(topElement);
    var y = findPosY(n);

    if (menu.container.style)
    {
        menu.container.style.left = x + "px";
    }
    else
    {
        menu.container.left = x;
    }

    if (menu.container.style)
    {
        menu.container.style.top = y + "px";
    }
    else
    {
        menu.container.top = y;
    }
}

// find the height of the menu
function getMenuWidth(menuIndex)
{
    var right = findPosX(document.getElementById('menu'+menuIndex+'_right'));
    var left = findPosX(document.getElementById('menu'+menuIndex+'Container'));
    return right - left;
}

// find the width of the menu
function getMenuHeight(menuIndex)
{
    var bottom = findPosY(document.getElementById('menu'+menuIndex+'_bottom'));
    var top = findPosY(document.getElementById('menu'+menuIndex+'Container'));
    return bottom - top;
}

// constructor
function ypSlideOutMenu(id, dir, left, top, width, height)
{
	this.ie  = document.all ? 1 : 0;
	this.ns4 = document.layers ? 1 : 0;
	this.dom = document.getElementById ? 1 : 0;
	this.css = "";

	if (this.ie || this.ns4 || this.dom)
    {
		this.id			 = id;
		this.dir		 = dir;
		this.orientation = dir == "left" || dir == "right" ? "h" : "v";
		this.dirType	 = dir == "right" || dir == "down" ? "-" : "+";
		this.dim		 = this.orientation == "h" ? width : height;
		this.hideTimer	 = false;
		this.aniTimer	 = false;
		this.open		 = false;
		this.over		 = false;
		this.startTime	 = 0;

		// global reference to this object
		this.gRef = "ypSlideOutMenu_"+id;
		eval(this.gRef+"=this");

		// add this menu object to an internal list of all menus
		ypSlideOutMenu.Registry[id] = this;

		var strCSS = "";
		strCSS += '#' + this.id + 'Container { visibility:hidden; ';
		strCSS += 'left:' + left + 'px; ';
		strCSS += 'top:' + top + 'px; ';
		strCSS += 'overflow:hidden; z-index:10000; }';
		strCSS += '#' + this.id + 'Container, #' + this.id + 'Content { position:absolute; ';
		strCSS += 'width:' + width + 'px; ';
		strCSS += 'height:' + height + 'px; ';
		strCSS += 'clip:rect(0px ' + width + 'px ' + height + 'px 0px); ';
		strCSS += '}';

		this.css = strCSS;

		this.load();
	}
}

ypSlideOutMenu.writeCSS = function()
{
    if (document.createElementNS)
    {
        var style = document.createElementNS("http://www.w3.org/1999/xhtml", "style");
        style.setAttribute("type", "text/css");
        var text = '';
        for (var id in ypSlideOutMenu.Registry)
        {
            text += ypSlideOutMenu.Registry[id].css;
            text += '\n';
        }
        var textNode = document.createTextNode(text);
        style.appendChild(textNode);
        document.getElementsByTagName("head")[0].appendChild(style);
    }
    else
    {
        document.writeln('<style type="text/css">');
        for (var regId in ypSlideOutMenu.Registry)
        {
            document.writeln(ypSlideOutMenu.Registry[regId].css);
        }
        document.writeln('</style>');
    }
};

ypSlideOutMenu.prototype.load = function()
{
	var d = document;
	var lyrId1 = this.id + "Container";
	var lyrId2 = this.id + "Content";
	var obj1 = this.dom ? d.getElementById(lyrId1) : this.ie ? d.all[lyrId1] : d.layers[lyrId1];
	if (obj1)
    {
        var obj2 = this.ns4 ? obj1.layers[lyrId2] : this.ie ? d.all[lyrId2] : d.getElementById(lyrId2);
    }

	if (!obj1 || !obj2)
    {
        window.setTimeout(this.gRef + ".load()", 100);
    }
	else
    {
		this.container	= obj1;
		this.menu		= obj2;
		this.style		= this.ns4 ? this.menu : this.menu.style;
		this.homePos	= eval("0" + this.dirType + this.dim);
		this.outPos		= 0;
		this.accelConst	= (this.outPos - this.homePos) / ypSlideOutMenu.aniLen / ypSlideOutMenu.aniLen;

		// set event handlers.
		if (this.ns4)
        {
            this.menu.captureEvents(Event.MOUSEOVER | Event.MOUSEOUT);
        }
		this.menu.onmouseover = new Function("ypSlideOutMenu.showMenu('" + this.id + "')");
		this.menu.onmouseout = new Function("ypSlideOutMenu.hideMenu('" + this.id + "')");

		//set initial state
		this.endSlide();
	}
};

ypSlideOutMenu.showMenu = function(id)
{
	var reg = ypSlideOutMenu.Registry;
	var obj = ypSlideOutMenu.Registry[id];

	if (ypSlideOutMenu.menusLoaded && obj.container)
    {
		obj.over = true;

		// close other menus.
		for (menu in reg)
        {
            if (id != menu)
            {
                ypSlideOutMenu.hide(menu);
            }
        }

		// if this menu is scheduled to close, cancel it.
		if (obj.hideTimer)
        {
            reg[id].hideTimer = window.clearTimeout(reg[id].hideTimer);
        }

		// if this menu is closed, open it.
		if (!obj.open && !obj.aniTimer)
        {
            reg[id].startSlide(true);
        }
	}
};

ypSlideOutMenu.hideMenu = function(id)
{
	// schedules the menu to close after <hideDelay> ms, which
	// gives the user time to cancel the action if they accidentally moused out
	var obj = ypSlideOutMenu.Registry[id];
	if (ypSlideOutMenu.menusLoaded && obj.container)
    {
		if (obj.hideTimer)
        {
            window.clearTimeout(obj.hideTimer);
        }
		obj.hideTimer = window.setTimeout("ypSlideOutMenu.hide('" + id + "')", ypSlideOutMenu.hideDelay);
	}
};

ypSlideOutMenu.hideAll = function()
{
	var reg = ypSlideOutMenu.Registry;
	for (menu in reg)
    {
		ypSlideOutMenu.hide(menu);
		if (menu.hideTimer)
        {
            window.clearTimeout(menu.hideTimer);
        }
	}
};

ypSlideOutMenu.hide = function(id)
{
	var obj = ypSlideOutMenu.Registry[id];
	obj.over = false;

	if (obj.hideTimer)
    {
        window.clearTimeout(obj.hideTimer);
    }

	// flag that this scheduled event has occured.
	obj.hideTimer = 0;

	// if this menu is open, close it.
	if (obj.open && !obj.aniTimer)
    {
        obj.startSlide(false);
    }
};

ypSlideOutMenu.prototype.startSlide = function(open)
{
	this[open ? "onactivate" : "ondeactivate"]();
	this.open = open;
	if (open)
    {
        this.setVisibility(true);
    }
	this.startTime = (new Date()).getTime()	;
	this.aniTimer = window.setInterval(this.gRef + ".slide()", ypSlideOutMenu.minCPUResolution);
};

ypSlideOutMenu.prototype.slide = function()
{
	var elapsed = (new Date()).getTime() - this.startTime;
	if (elapsed > ypSlideOutMenu.aniLen)
    {
        this.endSlide();
    }
	else
    {
		var d = Math.round(Math.pow(ypSlideOutMenu.aniLen-elapsed, 2) * this.accelConst);
		if (this.open && this.dirType == "-")
        {
            d = -d;
        }
		else if (this.open && this.dirType == "+")
        {
            d = -d;
        }
		else if (!this.open && this.dirType == "-")
        {
            d = -this.dim + d;
        }
		else
        {
            d = this.dim + d;
        }

		this.moveTo(d);
	}
};

ypSlideOutMenu.prototype.endSlide = function()
{
	this.aniTimer = window.clearTimeout(this.aniTimer);
	this.moveTo(this.open ? this.outPos : this.homePos);
	if (!this.open)
    {
        this.setVisibility(false);
    }
	if ((this.open && !this.over) || (!this.open && this.over))
    {
		this.startSlide(this.over);
	}
};

ypSlideOutMenu.prototype.setVisibility = function(bShow)
{
	var s = this.ns4 ? this.container : this.container.style;
	s.visibility = bShow ? "visible" : "hidden";
};

ypSlideOutMenu.prototype.moveTo = function(p)
{
	this.style[this.orientation == "h" ? "left" : "top"] = this.ns4 ? p : p + "px";
};

ypSlideOutMenu.prototype.getPos = function(c)
{
    return parseInt(this.style[c], 10);
};

// events
ypSlideOutMenu.prototype.onactivate		= function() { };
ypSlideOutMenu.prototype.ondeactivate	= function() { };