/* SpryAccordion.js - Revision: Spry Preview Release 1.4 */

// 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. OSTSEEFERIENLAND

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.animator = null;
  this.hasFocus = null;
  this.duration = 200;

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

  this.useFixedPanelHeights = false;
  this.fixedPanelHeight = 0;

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

  // Unfortunately in some browsers like Safari, the Stylesheets our
  // page depends on may not have been loaded at the time we are called.
  // This means we have to defer attaching our behaviors until after the
  // onload event fires, since some of our behaviors rely on dimensions
  // specified in the CSS.

  if (Spry.Widget.Accordion.onloadDidFire)
    this.attachBehaviors();
  else
    Spry.Widget.Accordion.loadQueue.push(this);
};

Spry.Widget.Accordion.onloadDidFire = false;
Spry.Widget.Accordion.loadQueue = [];

Spry.Widget.Accordion.addLoadListener = function(handler)
{
  if (typeof window.addEventListener != 'undefined')
    window.addEventListener('load', handler, false);
  else if (typeof document.addEventListener != 'undefined')
    document.addEventListener('load', handler, false);
  else if (typeof window.attachEvent != 'undefined')
    window.attachEvent('onload', handler);
};

Spry.Widget.Accordion.processLoadQueue = function(handler)
{
  Spry.Widget.Accordion.onloadDidFire = true;
  var q = Spry.Widget.Accordion.loadQueue;
  var qlen = q.length;
  for (var i = 0; i < qlen; i++)
    q[i].attachBehaviors();
};

Spry.Widget.Accordion.addLoadListener(Spry.Widget.Accordion.processLoadQueue);

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(panel)
{
  if (panel)
    this.addClassName(this.getPanelTab(panel), this.hoverClass);
};

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

Spry.Widget.Accordion.prototype.openPanel = function(panel)
{
  var panelA = this.currentPanel;
  var panelB = panel;
  
  if (!panelB || panelA == panelB)  
    return;

  var contentA; 
  if( panelA )
    contentA = this.getPanelContent(panelA);
  var contentB = this.getPanelContent(panelB);

  if (! contentB)
    return;

  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 });
    this.animator.start();
  }
  else
  {
    if(contentA)
      contentA.style.height = "0px";
    contentB.style.height = (this.useFixedPanelHeights ? this.fixedPanelHeight : contentB.scrollHeight) + "px";
  }

  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;
};

Spry.Widget.Accordion.prototype.openNextPanel = function()
{
  var panels = this.getPanels();
  var curPanelIndex = this.getCurrentPanelIndex();
  
  if( panels && curPanelIndex >= 0 && (curPanelIndex+1) < panels.length )
    this.openPanel(panels[curPanelIndex+1]);
};

Spry.Widget.Accordion.prototype.openPreviousPanel = function()
{
  var panels = this.getPanels();
  var curPanelIndex = this.getCurrentPanelIndex();
  
  if( panels && curPanelIndex > 0 && curPanelIndex < panels.length )
    this.openPanel(panels[curPanelIndex-1]);
};

Spry.Widget.Accordion.prototype.openFirstPanel = function()
{
  var panels = this.getPanels();
  if( panels )
    this.openPanel(panels[0]);
};

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

Spry.Widget.Accordion.prototype.onPanelClick = function(panel)
{
  // if (this.enableKeyboardNavigation)
  //   this.element.focus();
  if (panel != this.currentPanel)
    this.openPanel(panel);
  this.focus();
};

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

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

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.stopPropagation)
    e.stopPropagation();
  if (e.preventDefault)
    e.preventDefault();

  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.onPanelClick(panel); }, false);
    Spry.Widget.Accordion.addEventListener(tab, "mouseover", function(e) { return self.onPanelTabMouseOver(panel); }, false);
    Spry.Widget.Accordion.addEventListener(tab, "mouseout", function(e) { return self.onPanelTabMouseOut(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);
  }
  else
  {
    this.removeClassName(panel, this.openClass);
    this.addClassName(panel, this.closedClass);
    content.style.height = "0px";
  }
  
  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);
  }

  if (this.enableKeyboardNavigation)
  {
    // XXX: IE doesn't allow the setting of tabindex dynamically. This means we can't
    // rely on adding the tabindex attribute if it is missing to enable keyboard navigation
    // by default.

    var tabIndexAttr = this.element.attributes.getNamedItem("tabindex");
    // if (!tabIndexAttr) this.element.tabindex = 0;
    if (tabIndexAttr)
    {
      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.getCurrentPanelIndex = function()
{
  var panels = this.getPanels();
  for( var i = 0 ; i < panels.length; i++ )
  {
    if( this.currentPanel == panels[i] )
      return i;
  }
  return 0;
};

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

  this.fps = 0;
  this.steps = 10;
  this.duration = 500;
  this.onComplete = null;

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

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


  // If caller specified speed in terms of frames per second,
  // convert them into steps.

  if (this.fps > 0)
  {
    this.interval = Math.floor(1000 / this.fps);
    this.steps = parseInt((this.duration + (this.interval - 1)) / this.interval);
  }
  else if (this.steps > 0)
    this.interval = this.duration / this.steps;

  // 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)
      {
        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.increment = (obj.toHeight - obj.fromHeight) / this.steps;
        obj.overflow = c.style.overflow;
        this.panelData.push(obj);

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

Spry.Widget.Accordion.PanelAnimator.prototype.start = function()
{
  var self = this;
  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!

    if (this.stepCount < this.steps)
    {
      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()
{
  ++this.stepCount;

  this.animate();

  if (this.stepCount < this.steps)
    this.start();
  else if (this.onComplete)
    this.onComplete();
};

Spry.Widget.Accordion.PanelAnimator.prototype.animate = function()
{
  var i, obj;

  if (this.stepCount >= this.steps)
  {
    for (i = 0; i < this.panelData.length; i++)
    {
      obj = this.panelData[i];
      if (obj.panel != this.panel)
        obj.content.style.height = "0px";
      obj.content.style.overflow = obj.overflow;
      obj.content.style.height = obj.toHeight + "px";
    }
  }
  else
  {
    for (i = 0; i < this.panelData.length; i++)
    {
      obj = this.panelData[i];
      obj.fromHeight += obj.increment;
      obj.content.style.height = obj.fromHeight + "px";
    }
  }
};