// ############################################################################
// ##
// ##  Smooth Scrolling Dropdowns
// ##  
// ############################################################################

// History
// -------
//
// 20060225 RW Renamed "menu" elements to "popupmenu" to avoid conflict with
//          standard ID of div in DDSN style sheet.
//
// 20060226 RW Added DDMenu.menuContainer setting and test its CSS position
//          property before executing code to avoid problems with styles are
//          switched off.

// ####################################
// Configurations
// ####################################

DDMenu.Registry = []
DDMenu.aniLen = 250
DDMenu.hideDelay = 1000
DDMenu.minCPUResolution = 10
DDMenu.menuContainer = 'menu'

// ####################################
// Functions
// ####################################

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

	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 = "DDMenu_"+id
		eval(this.gRef+"=this")

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

		var d = document

        var strCSS = '<style type="text/css">';
        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(0 ' + width + ' ' + height + ' 0); '
		strCSS += '}'
        strCSS += '</style>';

        d.write(strCSS)

		this.load()
	}
}

DDMenu.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)
	var temp

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

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

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

DDMenu.showMenu = function(id)
{
	// The menu container must have a CSS position statement. This test
	// assures that the Javascript doesn't wreak havoc on the page when
	// styles are switched off.
	if (document.getElementById(DDMenu.menuContainer).style.position) {
		var reg = DDMenu.Registry
		var obj = DDMenu.Registry[id]

		if (obj.container) {
			obj.over = true

			// close other menus.
			for (popupmenu in reg) if (id != popupmenu) DDMenu.hide(popupmenu)

			// 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)
		}
	}
}

DDMenu.hideMenu = function(id)
{
	// The menu container must have a CSS position statement. This test
	// assures that the Javascript doesn't wreak havoc on the page when
	// styles are switched off.
	if (document.getElementById(DDMenu.menuContainer).style.position) {
		// schedules the menu to close after <hideDelay> ms, which
		// gives the user time to cancel the action if they accidentally moused out
		var obj = DDMenu.Registry[id]
		if (obj.container) {
			if (obj.hideTimer) window.clearTimeout(obj.hideTimer)
			obj.hideTimer = window.setTimeout("DDMenu.hide('" + id + "')", DDMenu.hideDelay);
		}
	}
}

DDMenu.hide = function(id)
{
	var obj = DDMenu.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)
}

DDMenu.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()", DDMenu.minCPUResolution)
}

DDMenu.prototype.slide = function() {
	var elapsed = (new Date()).getTime() - this.startTime
	if (elapsed > DDMenu.aniLen) this.endSlide()
	else {
		var d = Math.round(Math.pow(DDMenu.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)
	}
}

DDMenu.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)
	}
}

DDMenu.prototype.setVisibility = function(bShow) {
	var s = this.ns4 ? this.container : this.container.style
	s.visibility = bShow ? "visible" : "hidden"
}
DDMenu.prototype.moveTo = function(p) {
	this.style[this.orientation == "h" ? "left" : "top"] = this.ns4 ? p : p + "px"
}
DDMenu.prototype.getPos = function(c) {
	return parseInt(this.style[c])
}

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