/*****************************************************
 * ypSlideOutMenu
 * 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...
 *
 * --youngpup--
 *****************************************************/

ypSlideOutMenu.Registry = []
ypSlideOutMenu.aniLen = 650
ypSlideOutMenu.hideDelay = 325
ypSlideOutMenu.minCPUResolution = 10

// 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

   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 d = document
      d.write('<style type="text/css">')
      d.write('#' + this.id + 'Container { visibility:hidden; ')
      d.write('text-align: left; ')
      d.write('left:' + left + 'px; ')
      d.write('top:' + top + 'px; ')
      d.write('overflow:hidden; }')
      d.write('#' + this.id + 'Container, #' + this.id + 'Content { position:absolute; ')
      d.write('width:' + width + 'px; ')
      d.write('height:' + height + 'px; ')
      d.write('clip:rect(0 ' + width + ' ' + height + ' 0); ')
      d.write('}')
      d.write('</style>')

      this.load()
   }
}

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)
   var temp

   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 (obj.container) {
      obj.over = true

      // 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 (obj.container) {
         if (obj.hideTimer) window.clearTimeout(obj.hideTimer)
         obj.hideTimer = window.setTimeout("ypSlideOutMenu.hide('" + id + "')", ypSlideOutMenu.hideDelay);
      }
}

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])
}

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