// SpryAccordion.js - version 0.15 - Spry Pre-Release 1.6.1
//
// Copyright (c) 2006. Adobe Systems Incorporated.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
//   * Redistributions of source code must retain the above copyright notice,
//     this list of conditions and the following disclaimer.
//   * Redistributions in binary form must reproduce the above copyright notice,
//     this list of conditions and the following disclaimer in the documentation
//     and/or other materials provided with the distribution.
//   * Neither the name of Adobe Systems Incorporated nor the names of its
//     contributors may be used to endorse or promote products derived from this
//     software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.

var Spry;
if (!Spry) Spry = {};
if (!Spry.Widget) Spry.Widget = {};

Spry.Widget.Accordion = function(element, opts)
{
 this.element = this.getElement(element);
 this.defaultPanel = null;
 this.hoverClass = "AccordionPanelTabHover";
 this.openClass = "AccordionPanelOpen";
 this.closedClass = "AccordionPanelClosed";
 this.focusedClass = "AccordionFocused";
 this.enableAnimation = true;
 this.enableKeyboardNavigation = true;
 this.currentPanel = null;
 this.restorationPanel = null;
 this.animator = null;
 this.hasFocus = null;

 this.previousPanelKeyCode = Spry.Widget.Accordion.KEY_UP;
 this.nextPanelKeyCode = Spry.Widget.Accordion.KEY_DOWN;

 this.useFixedPanelHeights = true;
 this.fixedPanelHeight = 0;

 Spry.Widget.Accordion.setOptions(this, opts, true);

 this.attachBehaviors();
};

Spry.Widget.Accordion.prototype.getElement = function(ele)
{
 if (ele && typeof ele == "string")
  return document.getElementById(ele);
 return ele;
};

Spry.Widget.Accordion.prototype.addClassName = function(ele, className)
{
 if (!ele || !className || (ele.className && ele.className.search(new RegExp("\\b" + className + "\\b")) != -1))
  return;
 ele.className += (ele.className ? " " : "") + className;
};

Spry.Widget.Accordion.prototype.removeClassName = function(ele, className)
{
 if (!ele || !className || (ele.className && ele.className.search(new RegExp("\\b" + className + "\\b")) == -1))
  return;
 ele.className = ele.className.replace(new RegExp("\\s*\\b" + className + "\\b", "g"), "");
};

Spry.Widget.Accordion.setOptions = function(obj, optionsObj, ignoreUndefinedProps)
{
 if (!optionsObj)
  return;
 for (var optionName in optionsObj)
 {
  if (ignoreUndefinedProps && optionsObj[optionName] == undefined)
   continue;
  obj[optionName] = optionsObj[optionName];
 }
};

Spry.Widget.Accordion.prototype.onPanelTabMouseOver = function(e, panel)
{
 if (panel)
  this.addClassName(this.getPanelTab(panel), this.hoverClass);
 return false;
};

Spry.Widget.Accordion.prototype.onPanelTabMouseOut = function(e, panel)
{
 if (panel)
  this.removeClassName(this.getPanelTab(panel), this.hoverClass);
 return false;
};

Spry.Widget.Accordion.prototype.openPanel = function(elementOrIndex)
{
 var panelA = this.currentPanel;
 var panelB;

 if (typeof elementOrIndex == "number")
  panelB = this.getPanels()[elementOrIndex];
 else
  panelB = this.getElement(elementOrIndex);

 if (!panelB || panelA == panelB)
  return null;

 var contentA = panelA ? this.getPanelContent(panelA) : null;
 var contentB = this.getPanelContent(panelB);

 if (!contentB)
  return null;

 if (this.useFixedPanelHeights && !this.fixedPanelHeight)
  this.fixedPanelHeight = (contentA.offsetHeight) ? contentA.offsetHeight : contentA.scrollHeight;

 if (this.enableAnimation)
 {
  if (this.animator)
   this.animator.stop();
  this.animator = new Spry.Widget.Accordion.PanelAnimator(this, panelB, { duration: this.duration, fps: this.fps, transition: this.transition });
  this.animator.start();
 }
 else
 {
  if(contentA)
  {
   contentA.style.display = "none";
   contentA.style.height = "0px";
  }
  contentB.style.display = "block";
  contentB.style.height = this.useFixedPanelHeights ? this.fixedPanelHeight + "px" : "auto";
 }

 if(panelA)
 {
  this.removeClassName(panelA, this.openClass);
  this.addClassName(panelA, this.closedClass);
 }

 this.removeClassName(panelB, this.closedClass);
 this.addClassName(panelB, this.openClass);

 this.currentPanel = panelB;

 return panelB;
};

Spry.Widget.Accordion.prototype.closePanel = function()
{
 // The accordion can only ever have one panel open at any
 // give time, so this method only closes the current panel.
 // If the accordion is in fixed panel heights mode, this
 // method does nothing.

 if (!this.useFixedPanelHeights && this.currentPanel)
 {
  var panel = this.currentPanel;
  this.restorationPanel = this.currentPanel;
  var content = this.getPanelContent(panel);
  if (content)
  {
   if (this.enableAnimation)
   {
    if (this.animator)
     this.animator.stop();
    this.animator = new Spry.Widget.Accordion.PanelAnimator(this, null, { duration: this.duration, fps: this.fps, transition: this.transition });
    this.animator.start();
   }
   else
   {
    content.style.display = "none";
    content.style.height = "0px";
   }
  }
  this.removeClassName(panel, this.openClass);
  this.addClassName(panel, this.closedClass);
  this.currentPanel = null;
 }
};

Spry.Widget.Accordion.prototype.openNextPanel = function()
{
 return this.openPanel(this.getCurrentPanelIndex() + 1);
};

Spry.Widget.Accordion.prototype.openPreviousPanel = function()
{
 return this.openPanel(this.getCurrentPanelIndex() - 1);
};

Spry.Widget.Accordion.prototype.openFirstPanel = function()
{
 return this.openPanel(0);
};

Spry.Widget.Accordion.prototype.restorePanel = function()
{
// alert (this.getRestorePanelIndex());
 return this.openPanel(this.getRestorePanelIndex());
};

Spry.Widget.Accordion.prototype.openLastPanel = function()
{
 var panels = this.getPanels();
 return this.openPanel(panels[panels.length - 1]);
};

Spry.Widget.Accordion.prototype.onPanelTabClick = function(e, panel)
{
 if (panel != this.currentPanel)
  this.openPanel(panel);
 else
  this.closePanel();

 if (this.enableKeyboardNavigation)
  this.focus();

 if (e.preventDefault) e.preventDefault();
 else e.returnValue = false;
 if (e.stopPropagation) e.stopPropagation();
 else e.cancelBubble = true;

 return false;
};

Spry.Widget.Accordion.prototype.onFocus = function(e)
{
 this.hasFocus = true;
 this.addClassName(this.element, this.focusedClass);
 return false;
};

Spry.Widget.Accordion.prototype.onBlur = function(e)
{
 this.hasFocus = false;
 this.removeClassName(this.element, this.focusedClass);
 return false;
};

Spry.Widget.Accordion.KEY_UP = 38;
Spry.Widget.Accordion.KEY_DOWN = 40;

Spry.Widget.Accordion.prototype.onKeyDown = function(e)
{
 var key = e.keyCode;
 if (!this.hasFocus || (key != this.previousPanelKeyCode && key != this.nextPanelKeyCode))
  return true;

 var panels = this.getPanels();
 if (!panels || panels.length < 1)
  return false;
 var currentPanel = this.currentPanel ? this.currentPanel : panels[0];
 var nextPanel = (key == this.nextPanelKeyCode) ? currentPanel.nextSibling : currentPanel.previousSibling;

 while (nextPanel)
 {
  if (nextPanel.nodeType == 1 /* Node.ELEMENT_NODE */)
   break;
  nextPanel = (key == this.nextPanelKeyCode) ? nextPanel.nextSibling : nextPanel.previousSibling;
 }

 if (nextPanel && currentPanel != nextPanel)
  this.openPanel(nextPanel);

 if (e.preventDefault) e.preventDefault();
 else e.returnValue = false;
 if (e.stopPropagation) e.stopPropagation();
 else e.cancelBubble = true;

 return false;
};

Spry.Widget.Accordion.prototype.attachPanelHandlers = function(panel)
{
 if (!panel)
  return;

 var tab = this.getPanelTab(panel);

 if (tab)
 {
  var self = this;
  Spry.Widget.Accordion.addEventListener(tab, "click", function(e) { return self.onPanelTabClick(e, panel); }, false);
  Spry.Widget.Accordion.addEventListener(tab, "mouseover", function(e) { return self.onPanelTabMouseOver(e, panel); }, false);
  Spry.Widget.Accordion.addEventListener(tab, "mouseout", function(e) { return self.onPanelTabMouseOut(e, panel); }, false);
 }
};

Spry.Widget.Accordion.addEventListener = function(element, eventType, handler, capture)
{
 try
 {
  if (element.addEventListener)
   element.addEventListener(eventType, handler, capture);
  else if (element.attachEvent)
   element.attachEvent("on" + eventType, handler);
 }
 catch (e) {}
};

Spry.Widget.Accordion.prototype.initPanel = function(panel, isDefault)
{
 var content = this.getPanelContent(panel);
 if (isDefault)
 {
  this.currentPanel = panel;
  this.removeClassName(panel, this.closedClass);
  this.addClassName(panel, this.openClass);

  // Attempt to set up the height of the default panel. We don't want to
  // do any dynamic panel height calculations here because our accordion
  // or one of its parent containers may be display:none.

  if (content)
  {
   if (this.useFixedPanelHeights)
   {
    // We are in fixed panel height mode and the user passed in
    // a panel height for us to use.

    if (this.fixedPanelHeight)
     content.style.height = this.fixedPanelHeight + "px";
   }
   else
   {
    // We are in variable panel height mode, but since we can't
    // calculate the panel height here, we just set the height to
    // auto so that it expands to show all of its content.

    content.style.height = "auto";
   }
  }
 }
 else
 {
  this.removeClassName(panel, this.openClass);
  this.addClassName(panel, this.closedClass);

  if (content)
  {
   content.style.height = "0px";
   content.style.display = "none";
  }
 }

 this.attachPanelHandlers(panel);
};

Spry.Widget.Accordion.prototype.attachBehaviors = function()
{
 var panels = this.getPanels();
 for (var i = 0; i < panels.length; i++)
  this.initPanel(panels[i], i == this.defaultPanel);

 // Advanced keyboard navigation requires the tabindex attribute
 // on the top-level element.

 this.enableKeyboardNavigation = (this.enableKeyboardNavigation && this.element.attributes.getNamedItem("tabindex"));
 if (this.enableKeyboardNavigation)
 {
  var self = this;
  Spry.Widget.Accordion.addEventListener(this.element, "focus", function(e) { return self.onFocus(e); }, false);
  Spry.Widget.Accordion.addEventListener(this.element, "blur", function(e) { return self.onBlur(e); }, false);
  Spry.Widget.Accordion.addEventListener(this.element, "keydown", function(e) { return self.onKeyDown(e); }, false);
 }
};

Spry.Widget.Accordion.prototype.getPanels = function()
{
 return this.getElementChildren(this.element);
};

Spry.Widget.Accordion.prototype.getCurrentPanel = function()
{
 return this.currentPanel;
};

Spry.Widget.Accordion.prototype.getPanelIndex = function(panel)
{
 var panels = this.getPanels();
 for( var i = 0 ; i < panels.length; i++ )
 {
  if( panel == panels[i] )
   return i;
 }
 return -1;
};

Spry.Widget.Accordion.prototype.getCurrentPanelIndex = function()
{
 return this.getPanelIndex(this.currentPanel);
};

Spry.Widget.Accordion.prototype.getRestorePanelIndex = function()
{
 return this.getPanelIndex(this.restorationPanel);
};

Spry.Widget.Accordion.prototype.getPanelTab = function(panel)
{
 if (!panel)
  return null;
 return this.getElementChildren(panel)[0];
};

Spry.Widget.Accordion.prototype.getPanelContent = function(panel)
{
 if (!panel)
  return null;
 return this.getElementChildren(panel)[1];
};

Spry.Widget.Accordion.prototype.getElementChildren = function(element)
{
 var children = [];
 var child = element.firstChild;
 while (child)
 {
  if (child.nodeType == 1 /* Node.ELEMENT_NODE */)
   children.push(child);
  child = child.nextSibling;
 }
 return children;
};

Spry.Widget.Accordion.prototype.focus = function()
{
 if (this.element && this.element.focus)
  this.element.focus();
};

Spry.Widget.Accordion.prototype.blur = function()
{
 if (this.element && this.element.blur)
  this.element.blur();
};

/////////////////////////////////////////////////////

Spry.Widget.Accordion.PanelAnimator = function(accordion, panel, opts)
{
 this.timer = null;
 this.interval = 0;

 this.fps = 60;
 this.duration = 500;
 this.startTime = 0;

 this.transition = Spry.Widget.Accordion.PanelAnimator.defaultTransition;

 this.onComplete = null;

 this.panel = panel;
 this.panelToOpen = accordion.getElement(panel);
 this.panelData = [];
 this.useFixedPanelHeights = accordion.useFixedPanelHeights;

 Spry.Widget.Accordion.setOptions(this, opts, true);

 this.interval = Math.floor(1000 / this.fps);

 // Set up the array of panels we want to animate.

 var panels = accordion.getPanels();
 for (var i = 0; i < panels.length; i++)
 {
  var p = panels[i];
  var c = accordion.getPanelContent(p);
  if (c)
  {
   var h = c.offsetHeight;
   if (h == undefined)
    h = 0;

   if (p == panel && h == 0)
    c.style.display = "block";

   if (p == panel || h > 0)
   {
    var obj = new Object;
    obj.panel = p;
    obj.content = c;
    obj.fromHeight = h;
    obj.toHeight = (p == panel) ? (accordion.useFixedPanelHeights ? accordion.fixedPanelHeight : c.scrollHeight) : 0;
    obj.distance = obj.toHeight - obj.fromHeight;
    obj.overflow = c.style.overflow;
    this.panelData.push(obj);

    c.style.overflow = "hidden";
    c.style.height = h + "px";
   }
  }
 }
};

Spry.Widget.Accordion.PanelAnimator.defaultTransition = function(time, begin, finish, duration) { time /= duration; return begin + ((2 - time) * time * finish); };

Spry.Widget.Accordion.PanelAnimator.prototype.start = function()
{
 var self = this;
 this.startTime = (new Date).getTime();
 this.timer = setTimeout(function() { self.stepAnimation(); }, this.interval);
};

Spry.Widget.Accordion.PanelAnimator.prototype.stop = function()
{
 if (this.timer)
 {
  clearTimeout(this.timer);

  // If we're killing the timer, restore the overflow
  // properties on the panels we were animating!

  for (i = 0; i < this.panelData.length; i++)
  {
   obj = this.panelData[i];
   obj.content.style.overflow = obj.overflow;
  }
 }

 this.timer = null;
};

Spry.Widget.Accordion.PanelAnimator.prototype.stepAnimation = function()
{
 var curTime = (new Date).getTime();
 var elapsedTime = curTime - this.startTime;

 var i, obj;

 if (elapsedTime >= this.duration)
 {
  for (i = 0; i < this.panelData.length; i++)
  {
   obj = this.panelData[i];
   if (obj.panel != this.panel)
   {
    obj.content.style.display = "none";
    obj.content.style.height = "0px";
   }
   obj.content.style.overflow = obj.overflow;
   obj.content.style.height = (this.useFixedPanelHeights || obj.toHeight == 0) ? obj.toHeight + "px" : "auto";
  }
  if (this.onComplete)
   this.onComplete();
  return;
 }

 for (i = 0; i < this.panelData.length; i++)
 {
  obj = this.panelData[i];
  var ht = this.transition(elapsedTime, obj.fromHeight, obj.distance, this.duration);
  obj.content.style.height = ((ht < 0) ? 0 : ht) + "px";
 }

 var self = this;
 this.timer = setTimeout(function() { self.stepAnimation(); }, this.interval);
};