/* =================================================================================================
 * TransMenu 
 * March, 2003
 *
 * Customizable multi-level animated DHTML menus with transparency.
 *
 * Copyright 2003-2004, Aaron Boodman (www.youngpup.net)
 * =================================================================================================
 * "Can I use this?"
 * 
 * Use of this library is governed by the Creative Commons Attribution 2.0 License. You can check it 
 * out at: http://creativecommons.org/licenses/by/2.0/
 *
 * Basically: You may copy, distribute, and eat this code as you wish. But you must give me credit 
 * for writing it. You may not misrepresent yourself as the author of this code.
 * =================================================================================================
 * "It's kinda hard to read, though"
 *
 * The uncompressed, commented version of this script can be found at: 
 * http://youngpup.net/projects/transMenus
 * =================================================================================================
 * updates:
 * 04.19.04 fixed cascade problem with menus nested greater than two levels.
 * 12.23.03 added hideCurrent for menu actuators with no menus. renamed to TransMenu.
 * 04.18.03	fixed render bug in IE 5.0 Mac by removing that browser from compatibility table ;)
 *			also made gecko check a little more strict by specifying build no.
 * ============================================================================================== */

// z="http://larry/lesley_lewin/blackwelshmountain/current_version/public_html/";
// z="http://www.3ric.co.uk/";
 z="http://www.blackwelshmountain.org.uk/";


//==================================================================================================
// Configuration properties
//==================================================================================================
TransMenu.spacerGif = z+"transmenu/x.gif";						// path to a transparent spacer gif
TransMenu.dingbatOn = z+"transmenu/submenu-on.gif";			// path to the active sub menu dingbat
TransMenu.dingbatOff = z+"transmenu/submenu-off.gif";			// path to the inactive sub menu dingbat
TransMenu.dingbatSize = 14;											// size of the dingbat (square shape assumed)
TransMenu.menuPadding = 5;												// padding between menu border and items grid
TransMenu.itemPadding = 3;												// additional padding around each item
TransMenu.shadowSize = 2;							  					// size of shadow under menu
TransMenu.shadowOffset = 3;											// distance shadow should be offset from leading edge
TransMenu.shadowColor = "#888";										// color of shadow (transparency is set in CSS)
TransMenu.shadowPng = z+"transmenu/grey-40.png";				// a PNG graphic to serve as the shadow for mac IE5
TransMenu.backgroundColor = "#eeffee";								// color of the background (transparency set in CSS)
TransMenu.backgroundPng = z+"transmenu/white-90.png";		 	// a PNG graphic to server as the background for mac IE5
TransMenu.hideDelay = 1000;											// number of milliseconds to wait before hiding a menu
TransMenu.slideTime = 400;												// number of milliseconds it takes to open and close a menu


//==================================================================================================
// Internal use properties
//==================================================================================================
TransMenu.reference = {topLeft:1,topRight:2,bottomLeft:3,bottomRight:4};
TransMenu.direction = {down:1,right:2};
TransMenu.registry = [];
TransMenu._maxZ = 100;



//==================================================================================================
// Static methods
//==================================================================================================
// supporting win ie5+, mac ie5.1+ and gecko >= mozilla 1.0
TransMenu.isSupported = function() {
		var ua = navigator.userAgent.toLowerCase();
		var pf = navigator.platform.toLowerCase();
		var an = navigator.appName;
		var r = false;

		if (ua.indexOf("gecko") > -1 && navigator.productSub >= 20020605) r = true; // gecko >= moz 1.0
		else if (an == "Microsoft Internet Explorer") {
				if (document.getElementById) { // ie5.1+ mac,win
						if (pf.indexOf("mac") == 0) {
							r = /msie (\d(.\d*)?)/.test(ua) && Number(RegExp.$1) >= 5.1;
						}
						else r = true;
				}
		}

		return r;
}

// call this in onload once menus have been created
TransMenu.initialize = function() {
		for (var i = 0, menu = null; menu = this.registry[i]; i++) {
				menu.initialize();
		}
}

// call this in document body to write out menu html
TransMenu.renderAll = function() {
		var aMenuHtml = [];
		for (var i = 0, menu = null; menu = this.registry[i]; i++) {
				aMenuHtml[i] = menu.toString();
		}
		document.write(aMenuHtml.join(""));
}

//==================================================================================================
// TransMenu constructor (only called internally)
//==================================================================================================
// oActuator			: The thing that causes the menu to be shown when it is mousedover. Either a
//						reference to an HTML element, or a TransMenuItem from an existing menu.
// iDirection		   : The direction to slide out. One of TransMenu.direction.
// iLeft				: Left pixel offset of menu from actuator
// iTop				 : Top pixel offset of menu from actuator
// iReferencePoint	  : Corner of actuator to measure from. One of TransMenu.referencePoint.
// parentMenuSet		: Menuset this menu will be added to.
//==================================================================================================
function TransMenu(oActuator, iDirection, iLeft, iTop, iReferencePoint, parentMenuSet) {
		// public methods
		this.addItem = addItem;
		this.addMenu = addMenu;
		this.toString = toString;
		this.initialize = initialize;
		this.isOpen = false;
		this.show = show;
		this.hide = hide;
		this.items = [];

		// events
		this.onactivate = new Function();	   // when the menu starts to slide open
		this.ondeactivate = new Function();	 // when the menu finishes sliding closed
		this.onmouseover = new Function();	  // when the menu has been moused over
		this.onqueue = new Function();		  // hack .. when the menu sets a timer to be closed a little while in the future
		this.ondequeue = new Function();

		// initialization
		this.index = TransMenu.registry.length;
		TransMenu.registry[this.index] = this;

		var id = "TransMenu" + this.index;
		var contentHeight = null;
		var contentWidth = null;
		var childMenuSet = null;
		var animating = false;
		var childMenus = [];
		var slideAccel = -1;
		var elmCache = null;
		var ready = false;
		var _this = this;
		var a = null;

		var pos = iDirection == TransMenu.direction.down ? "top" : "left";
		var dim = null;

		// private and public method implimentations
		function addItem(sText, sUrl) {
				var item = new TransMenuItem(sText, sUrl, this);
				item._index = this.items.length;
				this.items[item._index] = item;
		}

		function addMenu(oMenuItem) {
				if (!oMenuItem.parentMenu == this) throw new Error("Cannot add a menu here");

				if (childMenuSet == null) childMenuSet = new TransMenuSet(TransMenu.direction.right, -5, 2, TransMenu.reference.topRight);

				var m = childMenuSet.addMenu(oMenuItem);

				childMenus[oMenuItem._index] = m;
				m.onmouseover = child_mouseover;
				m.ondeactivate = child_deactivate;
				m.onqueue = child_queue;
				m.ondequeue = child_dequeue;

				return m;
		}

		function initialize() {
				initCache();
				initEvents();
				initSize();
				ready = true;
		}

		function show() {
				//dbg_dump("show");
				if (ready) {
						_this.isOpen = true;
						animating = true;
						setContainerPos();
						elmCache["clip"].style.visibility = "visible";
						elmCache["clip"].style.zIndex = TransMenu._maxZ++;
						//dbg_dump("maxZ: " + TransMenu._maxZ);
						slideStart();
						_this.onactivate();
				}
		}

		function hide() {
				if (ready) {
						_this.isOpen = false;
						animating = true;

						for (var i = 0, item = null; item = elmCache.item[i]; i++) 
								dehighlight(item);

						if (childMenuSet) childMenuSet.hide();

						slideStart();
						_this.ondeactivate();
				}
		}

		function setContainerPos() {
				var sub = oActuator.constructor == TransMenuItem; 
				var act = sub ? oActuator.parentMenu.elmCache["item"][oActuator._index] : oActuator; 
				var el = act;
				
				var x = 0;
				var y = 0;

				
				var minX = 0;
				var maxX = (window.innerWidth ? window.innerWidth : document.body.clientWidth) - parseInt(elmCache["clip"].style.width);
				var minY = 0;
				var maxY = (window.innerHeight ? window.innerHeight : document.body.clientHeight) - parseInt(elmCache["clip"].style.height);

				// add up all offsets... subtract any scroll offset
				while (sub ? el.parentNode.className.indexOf("transMenu") == -1 : el.offsetParent) {
						x += el.offsetLeft;
						y += el.offsetTop;

						if (el.scrollLeft) x -= el.scrollLeft;
						if (el.scrollTop) y -= el.scrollTop;
						
						el = el.offsetParent;
				}

				if (oActuator.constructor == TransMenuItem) {
						x += parseInt(el.parentNode.style.left);
						y += parseInt(el.parentNode.style.top);
				}

				switch (iReferencePoint) {
						case TransMenu.reference.topLeft:
								break;
						case TransMenu.reference.topRight:
								x += act.offsetWidth;
								break;
						case TransMenu.reference.bottomLeft:
								y += act.offsetHeight;
								break;
						case TransMenu.reference.bottomRight:
								x += act.offsetWidth;
								y += act.offsetHeight;
								break;
				}

				x += iLeft;
				y += iTop;

				x = Math.max(Math.min(x, maxX), minX);
				y = Math.max(Math.min(y, maxY), minY);

				elmCache["clip"].style.left = x + "px";
				elmCache["clip"].style.top = y + "px";
		}

		function slideStart() {
				var x0 = parseInt(elmCache["content"].style[pos]);
				var x1 = _this.isOpen ? 0 : -dim;

				if (a != null) a.stop();
				a = new Accelimation(x0, x1, TransMenu.slideTime, slideAccel);

				a.onframe = slideFrame;
				a.onend = slideEnd;

				a.start();
		}

		function slideFrame(x) {
				elmCache["content"].style[pos] = x + "px";
		}

		function slideEnd() {
				if (!_this.isOpen) elmCache["clip"].style.visibility = "hidden";
				animating = false;
		}

		function initSize() {
				// everything is based off the size of the items table...
				var ow = elmCache["items"].offsetWidth;
				var oh = elmCache["items"].offsetHeight;
				var ua = navigator.userAgent.toLowerCase();

				// clipping container should be ow/oh + the size of the shadow
				elmCache["clip"].style.width = ow + TransMenu.shadowSize +  2 + "px";
				elmCache["clip"].style.height = oh + TransMenu.shadowSize + 2 + "px";

				// same with content...
				elmCache["content"].style.width = ow + TransMenu.shadowSize + "px";
				elmCache["content"].style.height = oh + TransMenu.shadowSize + "px";

				contentHeight = oh + TransMenu.shadowSize;
				contentWidth = ow + TransMenu.shadowSize;
				
				dim = iDirection == TransMenu.direction.down ? contentHeight : contentWidth;

				// set initially closed
				elmCache["content"].style[pos] = -dim - TransMenu.shadowSize + "px";
				elmCache["clip"].style.visibility = "hidden";

				// if *not* mac/ie 5
				if (ua.indexOf("mac") == -1 || ua.indexOf("gecko") > -1) {
						// set background div to offset size
						elmCache["background"].style.width = ow + "px";
						elmCache["background"].style.height = oh + "px";
						elmCache["background"].style.backgroundColor = TransMenu.backgroundColor;

						// shadow left starts at offset left and is offsetHeight pixels high
						elmCache["shadowRight"].style.left = ow + "px";
						elmCache["shadowRight"].style.height = oh - (TransMenu.shadowOffset - TransMenu.shadowSize) + "px";
						elmCache["shadowRight"].style.backgroundColor = TransMenu.shadowColor;

						// shadow bottom starts at offset height and is offsetWidth - shadowOffset 
						// pixels wide (we don't want the bottom and right shadows to overlap or we 
						// get an extra bright bottom-right corner)
						elmCache["shadowBottom"].style.top = oh + "px";
						elmCache["shadowBottom"].style.width = ow - TransMenu.shadowOffset + "px";
						elmCache["shadowBottom"].style.backgroundColor = TransMenu.shadowColor;
				}
				// mac ie is a little different because we use a PNG for the transparency
				else {
						// set background div to offset size
						elmCache["background"].firstChild.src = TransMenu.backgroundPng;
						elmCache["background"].firstChild.width = ow;
						elmCache["background"].firstChild.height = oh;

						// shadow left starts at offset left and is offsetHeight pixels high
						elmCache["shadowRight"].firstChild.src = TransMenu.shadowPng;
						elmCache["shadowRight"].style.left = ow + "px";
						elmCache["shadowRight"].firstChild.width = TransMenu.shadowSize;
						elmCache["shadowRight"].firstChild.height = oh - (TransMenu.shadowOffset - TransMenu.shadowSize);

						// shadow bottom starts at offset height and is offsetWidth - shadowOffset 
						// pixels wide (we don't want the bottom and right shadows to overlap or we 
						// get an extra bright bottom-right corner)
						elmCache["shadowBottom"].firstChild.src = TransMenu.shadowPng;
						elmCache["shadowBottom"].style.top = oh + "px";
						elmCache["shadowBottom"].firstChild.height = TransMenu.shadowSize;
						elmCache["shadowBottom"].firstChild.width = ow - TransMenu.shadowOffset;
				}
		}
		
		function initCache() {
				var menu = document.getElementById(id);
				var all = menu.all ? menu.all : menu.getElementsByTagName("*"); // IE/win doesn't support * syntax, but does have the document.all thing

				elmCache = {};
				elmCache["clip"] = menu;
				elmCache["item"] = [];
				
				for (var i = 0, elm = null; elm = all[i]; i++) {
						switch (elm.className) {
								case "items":
								case "content":
								case "background":
								case "shadowRight":
								case "shadowBottom":
										elmCache[elm.className] = elm;
										break;
								case "item":
										elm._index = elmCache["item"].length;
										elmCache["item"][elm._index] = elm;
										break;
						}
				}

				// hack!
				_this.elmCache = elmCache;
		}

		function initEvents() {
				// hook item mouseover
				for (var i = 0, item = null; item = elmCache.item[i]; i++) {
						item.onmouseover = item_mouseover;
						item.onmouseout = item_mouseout;
						item.onclick = item_click;
				}

				// hook actuation
				if (typeof oActuator.tagName != "undefined") {
						oActuator.onmouseover = actuator_mouseover;
						oActuator.onmouseout = actuator_mouseout;
				}

				// hook menu mouseover
				elmCache["content"].onmouseover = content_mouseover;
				elmCache["content"].onmouseout = content_mouseout;
		}

		function highlight(oRow) {
				oRow.className = "item hover";
				if (childMenus[oRow._index]) 
						oRow.lastChild.firstChild.src = TransMenu.dingbatOn;
		}

		function dehighlight(oRow) {
				oRow.className = "item";
				if (childMenus[oRow._index]) 
						oRow.lastChild.firstChild.src = TransMenu.dingbatOff;
		}

		function item_mouseover() {
				if (!animating) {
						highlight(this);

						if (childMenus[this._index]) 
								childMenuSet.showMenu(childMenus[this._index]);
						else if (childMenuSet) childMenuSet.hide();
				}
		}

		function item_mouseout() {
				if (!animating) {
						if (childMenus[this._index])
								childMenuSet.hideMenu(childMenus[this._index]);
						else	// otherwise child_deactivate will do this
								dehighlight(this);
				}
		}

		function item_click() {
				if (!animating) {
						if (_this.items[this._index].url) 
								location.href = _this.items[this._index].url;
				}
		}

		function actuator_mouseover() {
				parentMenuSet.showMenu(_this);
		}

		function actuator_mouseout() {
				parentMenuSet.hideMenu(_this);
		}

		function content_mouseover() {
				if (!animating) {
						parentMenuSet.showMenu(_this);
						_this.onmouseover();
				}
		}

		function content_mouseout() {
				if (!animating) {
						parentMenuSet.hideMenu(_this);
				}
		}

		function child_mouseover() {
				if (!animating) {
						parentMenuSet.showMenu(_this);
				}
		}

		function child_deactivate() {
				for (var i = 0; i < childMenus.length; i++) {
						if (childMenus[i] == this) {
								dehighlight(elmCache["item"][i]);
								break;
						}
				}
		}

		function child_queue() {
				parentMenuSet.hideMenu(_this);
		}

		function child_dequeue() {
				parentMenuSet.showMenu(_this);
		}

		function toString() {
				var aHtml = [];
				var sClassName = "transMenu" + (oActuator.constructor != TransMenuItem ? " top" : "");

				for (var i = 0, item = null; item = this.items[i]; i++) {
						aHtml[i] = item.toString(childMenus[i]);
				}

				return '<div id="' + id + '" class="' + sClassName + '">' + 
						'<div class="content"><table class="items" cellpadding="0" cellspacing="0" border="0">' + 
						'<tr style="height:5px;"><td colspan="2"></td></tr>' + 
						aHtml.join('') + 
						'<tr style="height:5px;"><td colspan="2"></td></tr></table>' + 
						'<div class="shadowBottom"><img src="' + TransMenu.spacerGif + '" width="1" height="1"></div>' + 
						'<div class="shadowRight"><img src="' + TransMenu.spacerGif + '" width="1" height="1"></div>' + 
						'<div class="background"><img src="' + TransMenu.spacerGif + '" width="1" height="1"></div>' + 
						'</div></div>';
		}
}



//==================================================================================================
// TransMenuSet
//==================================================================================================
// iDirection		   : The direction to slide out. One of TransMenu.direction.
// iLeft				: Left pixel offset of menus from actuator
// iTop				 : Top pixel offset of menus from actuator
// iReferencePoint	  : Corner of actuator to measure from. One of TransMenu.referencePoint.
//==================================================================================================
TransMenuSet.registry = [];

function TransMenuSet(iDirection, iLeft, iTop, iReferencePoint) {
		// public methods
		this.addMenu = addMenu;
		this.showMenu = showMenu;
		this.hideMenu = hideMenu;
		this.hide = hide;
		this.hideCurrent = hideCurrent;

		// initialization
		var menus = [];
		var _this = this;
		var current = null;

		this.index = TransMenuSet.registry.length;
		TransMenuSet.registry[this.index] = this;

		// method implimentations...
		function addMenu(oActuator) {
				var m = new TransMenu(oActuator, iDirection, iLeft, iTop, iReferencePoint, this);
				menus[menus.length] = m;
				return m;
		}

		function showMenu(oMenu) {
				if (oMenu != current) {
						// close currently open menu
						if (current != null) hide(current);		

						// set current menu to this one
						current = oMenu;

						// if this menu is closed, open it
						oMenu.show();
				}
				else {
						// hide pending calls to close this menu
						cancelHide(oMenu);
				}
		}

		function hideMenu(oMenu) {
				//dbg_dump("hideMenu a " + oMenu.index);
				if (current == oMenu && oMenu.isOpen) {
						//dbg_dump("hideMenu b " + oMenu.index);
						if (!oMenu.hideTimer) scheduleHide(oMenu);
				}
		}

		function scheduleHide(oMenu) {
				//dbg_dump("scheduleHide " + oMenu.index);
				oMenu.onqueue();
				oMenu.hideTimer = window.setTimeout("TransMenuSet.registry[" + _this.index + "].hide(TransMenu.registry[" + oMenu.index + "])", TransMenu.hideDelay);
		}

		function cancelHide(oMenu) {
				//dbg_dump("cancelHide " + oMenu.index);
				if (oMenu.hideTimer) {
						oMenu.ondequeue();
						window.clearTimeout(oMenu.hideTimer);
						oMenu.hideTimer = null;
				}
		}

		function hide(oMenu) {   
				if (!oMenu && current) oMenu = current;

				if (oMenu && current == oMenu && oMenu.isOpen) {
						hideCurrent();
				}
		}

		function hideCurrent() {
				if (null != current) {
					cancelHide(current);
					current.hideTimer = null;
					current.hide();
					current = null;
				}
		}
}

//==================================================================================================
// TransMenuItem (internal)
// represents an item in a dropdown
//==================================================================================================
// sText		: The item display text
// sUrl		 : URL to load when the item is clicked
// oParent	  : Menu this item is a part of
//==================================================================================================
function TransMenuItem(sText, sUrl, oParent) {
		this.toString = toString;
		this.text = sText;
		this.url = sUrl;
		this.parentMenu = oParent;

		function toString(bDingbat) {
				var sDingbat = bDingbat ? TransMenu.dingbatOff : TransMenu.spacerGif;
				var iEdgePadding = TransMenu.itemPadding + TransMenu.menuPadding;
				var sPaddingLeft = "padding:" + TransMenu.itemPadding + "px; padding-left:" + iEdgePadding + "px;"
				var sPaddingRight = "padding:" + TransMenu.itemPadding + "px; padding-right:" + iEdgePadding + "px;"

				return '<tr class="item"><td nowrap style="' + sPaddingLeft + '">' + 
						sText + '</td><td width="14" style="' + sPaddingRight + '">' + 
						'<img src="' + sDingbat + '" width="14" height="14"></td></tr>';
		}
}






//=====================================================================
// Accel[erated] [an]imation object
// change a property of an object over time in an accelerated fashion
//=====================================================================
// obj  : reference to the object whose property you'd like to animate
// prop : property you would like to change eg: "left"
// to   : final value of prop
// time : time the animation should take to run
// zip	: optional. specify the zippiness of the acceleration. pick a 
//		  number between -1 and 1 where -1 is full decelerated, 1 is 
//		  full accelerated, and 0 is linear (no acceleration). default
//		  is 0.
// unit	: optional. specify the units for use with prop. default is 
//		  "px".
//=====================================================================
// bezier functions lifted from the lib_animation.js file in the 
// 13th Parallel API. www.13thparallel.org
//=====================================================================

function Accelimation(from, to, time, zip) {
	if (typeof zip  == "undefined") zip  = 0;
	if (typeof unit == "undefined") unit = "px";

		this.x0		 = from;
		this.x1		= to;
	this.dt		= time;
	this.zip	= -zip;
	this.unit	= unit;
	this.timer	= null;
	this.onend	= new Function();
		this.onframe	= new Function();
}



//=====================================================================
// public methods
//=====================================================================

// after you create an accelimation, you call this to start it-a runnin'
Accelimation.prototype.start = function() {
	this.t0 = new Date().getTime();
	this.t1 = this.t0 + this.dt;
	var dx	= this.x1 - this.x0;
	this.c1 = this.x0 + ((1 + this.zip) * dx / 3);
	this.c2 = this.x0 + ((2 + this.zip) * dx / 3);
	Accelimation._add(this);
}

// and if you need to stop it early for some reason...
Accelimation.prototype.stop = function() {
	Accelimation._remove(this);
}



//=====================================================================
// private methods
//=====================================================================

// paints one frame. gets called by Accelimation._paintAll.
Accelimation.prototype._paint = function(time) {
	if (time < this.t1) {
		var elapsed = time - this.t0;
			this.onframe(Accelimation._getBezier(elapsed/this.dt,this.x0,this.x1,this.c1,this.c2));
		}
	else this._end();
}

// ends the animation
Accelimation.prototype._end = function() {
	Accelimation._remove(this);
		this.onframe(this.x1);
	this.onend();
}




//=====================================================================
// static methods (all private)
//=====================================================================

// add a function to the list of ones to call periodically
Accelimation._add = function(o) {
	var index = this.instances.length;
	this.instances[index] = o;
	// if this is the first one, start the engine
	if (this.instances.length == 1) {
		this.timerID = window.setInterval("Accelimation._paintAll()", this.targetRes);
	}
}

// remove a function from the list
Accelimation._remove = function(o) {
	for (var i = 0; i < this.instances.length; i++) {
		if (o == this.instances[i]) {
			this.instances = this.instances.slice(0,i).concat( this.instances.slice(i+1) );
			break;
		}
	}
	// if that was the last one, stop the engine
	if (this.instances.length == 0) {
		window.clearInterval(this.timerID);
		this.timerID = null;
	}
}

// "engine" - call each function in the list every so often
Accelimation._paintAll = function() {
	var now = new Date().getTime();
	for (var i = 0; i < this.instances.length; i++) {
		this.instances[i]._paint(now);
	}
}


// Bezier functions:
Accelimation._B1 = function(t) { return t*t*t }
Accelimation._B2 = function(t) { return 3*t*t*(1-t) }
Accelimation._B3 = function(t) { return 3*t*(1-t)*(1-t) }
Accelimation._B4 = function(t) { return (1-t)*(1-t)*(1-t) }


//Finds the coordinates of a point at a certain stage through a bezier curve
Accelimation._getBezier = function(percent,startPos,endPos,control1,control2) {
	return endPos * this._B1(percent) + control2 * this._B2(percent) + control1 * this._B3(percent) + startPos * this._B4(percent);
}


//=====================================================================
// static properties
//=====================================================================

Accelimation.instances = [];
Accelimation.targetRes = 10;
Accelimation.timerID = null;


//=====================================================================
// IE win memory cleanup
//=====================================================================

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		'onselectstart',
		'oncontextmenu'
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