// SpryTabbedPanels.js - version 0.6 - 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.TabbedPanels = function(element, opts)
{
 this.element = this.getElement(element);
   this.defaultTab = 0; // Show the first panel by default.
   this.tabSelectedClass = "TabbedPanelsTabSelected";
 this.tabHoverClass = "TabbedPanelsTabHover";
   this.tabFocusedClass = "TabbedPanelsTabFocused";
   this.panelVisibleClass = "TabbedPanelsContentVisible";
 this.focusElement = null;
  this.hasFocus = false;
 this.currentTabIndex = 0;
  this.enableKeyboardNavigation = true;
  this.nextPanelKeyCode = Spry.Widget.TabbedPanels.KEY_RIGHT;
    this.previousPanelKeyCode = Spry.Widget.TabbedPanels.KEY_LEFT;

    Spry.Widget.TabbedPanels.setOptions(this, opts);

  // If the defaultTab is expressed as a number/index, convert
   // it to an element.

  if (typeof (this.defaultTab) == "number")
  {
      if (this.defaultTab < 0)
           this.defaultTab = 0;
       else
       {
          var count = this.getTabbedPanelCount();
            if (this.defaultTab >= count)
              this.defaultTab = (count > 1) ? (count - 1) : 0;
       }

     this.defaultTab = this.getTabs()[this.defaultTab];
 }

 // The defaultTab property is supposed to be the tab element for the tab content
   // to show by default. The caller is allowed to pass in the element itself or the
  // element's id, so we need to convert the current value to an element if necessary.

  if (this.defaultTab)
       this.defaultTab = this.getElement(this.defaultTab);

   this.attachBehaviors();
};

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

Spry.Widget.TabbedPanels.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.TabbedPanels.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.TabbedPanels.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.TabbedPanels.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.TabbedPanels.prototype.getTabGroup = function()
{
    if (this.element)
  {
      var children = this.getElementChildren(this.element);
      if (children.length)
           return children[0];
    }
  return null;
};

Spry.Widget.TabbedPanels.prototype.getTabs = function()
{
 var tabs = [];
 var tg = this.getTabGroup();
   if (tg)
        tabs = this.getElementChildren(tg);
    return tabs;
};

Spry.Widget.TabbedPanels.prototype.getContentPanelGroup = function()
{
    if (this.element)
  {
      var children = this.getElementChildren(this.element);
      if (children.length > 1)
           return children[1];
    }
  return null;
};

Spry.Widget.TabbedPanels.prototype.getContentPanels = function()
{
    var panels = [];
   var pg = this.getContentPanelGroup();
  if (pg)
        panels = this.getElementChildren(pg);
  return panels;
};

Spry.Widget.TabbedPanels.prototype.getIndex = function(ele, arr)
{
  ele = this.getElement(ele);
    if (ele && arr && arr.length)
  {
      for (var i = 0; i < arr.length; i++)
       {
          if (ele == arr[i])
             return i;
      }
  }
  return -1;
};

Spry.Widget.TabbedPanels.prototype.getTabIndex = function(ele)
{
    var i = this.getIndex(ele, this.getTabs());
    if (i < 0)
     i = this.getIndex(ele, this.getContentPanels());
   return i;
};

Spry.Widget.TabbedPanels.prototype.getCurrentTabIndex = function()
{
 return this.currentTabIndex;
};

Spry.Widget.TabbedPanels.prototype.getTabbedPanelCount = function(ele)
{
  return Math.min(this.getTabs().length, this.getContentPanels().length);
};

Spry.Widget.TabbedPanels.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.TabbedPanels.prototype.cancelEvent = function(e)
{
    if (e.preventDefault) e.preventDefault();
  else e.returnValue = false;
    if (e.stopPropagation) e.stopPropagation();
    else e.cancelBubble = true;

   return false;
};

Spry.Widget.TabbedPanels.prototype.onTabClick = function(e, tab)
{
   this.showPanel(tab);
   return this.cancelEvent(e);
};

Spry.Widget.TabbedPanels.prototype.onTabMouseOver = function(e, tab)
{
 this.addClassName(tab, this.tabHoverClass);
    return false;
};

Spry.Widget.TabbedPanels.prototype.onTabMouseOut = function(e, tab)
{
    this.removeClassName(tab, this.tabHoverClass);
 return false;
};

Spry.Widget.TabbedPanels.prototype.onTabFocus = function(e, tab)
{
   this.hasFocus = true;
  this.addClassName(tab, this.tabFocusedClass);
  return false;
};

Spry.Widget.TabbedPanels.prototype.onTabBlur = function(e, tab)
{
    this.hasFocus = false;
 this.removeClassName(tab, this.tabFocusedClass);
   return false;
};

Spry.Widget.TabbedPanels.KEY_UP = 38;
Spry.Widget.TabbedPanels.KEY_DOWN = 40;
Spry.Widget.TabbedPanels.KEY_LEFT = 37;
Spry.Widget.TabbedPanels.KEY_RIGHT = 39;



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

  var tabs = this.getTabs();
 for (var i =0; i < tabs.length; i++)
       if (tabs[i] == tab)
        {
          var el = false;
            if (key == this.previousPanelKeyCode && i > 0)
             el = tabs[i-1];
            else if (key == this.nextPanelKeyCode && i < tabs.length-1)
                el = tabs[i+1];

           if (el)
            {
              this.showPanel(el);
                el.focus();
                break;
         }
      }

 return this.cancelEvent(e);
};

Spry.Widget.TabbedPanels.prototype.preorderTraversal = function(root, func)
{
  var stopTraversal = false;
 if (root)
  {
      stopTraversal = func(root);
        if (root.hasChildNodes())
      {
          var child = root.firstChild;
           while (!stopTraversal && child)
            {
              stopTraversal = this.preorderTraversal(child, func);
               try { child = child.nextSibling; } catch (e) { child = null; }
         }
      }
  }
  return stopTraversal;
};

Spry.Widget.TabbedPanels.prototype.addPanelEventListeners = function(tab, panel)
{
   var self = this;
   Spry.Widget.TabbedPanels.addEventListener(tab, "click", function(e) { return self.onTabClick(e, tab); }, false);
   Spry.Widget.TabbedPanels.addEventListener(tab, "mouseover", function(e) { return self.onTabMouseOver(e, tab); }, false);
   Spry.Widget.TabbedPanels.addEventListener(tab, "mouseout", function(e) { return self.onTabMouseOut(e, tab); }, false);

    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.

        // Find the first element within the tab container that has a tabindex or the first
        // anchor tag.
     
       var tabIndexEle = null;
        var tabAnchorEle = null;

      this.preorderTraversal(tab, function(node) {
           if (node.nodeType == 1 /* NODE.ELEMENT_NODE */)
            {
              var tabIndexAttr = tab.attributes.getNamedItem("tabindex");
                if (tabIndexAttr)
              {
                  tabIndexEle = node;
                    return true;
               }
              if (!tabAnchorEle && node.nodeName.toLowerCase() == "a")
                   tabAnchorEle = node;
           }
          return false;
      });

       if (tabIndexEle)
           this.focusElement = tabIndexEle;
       else if (tabAnchorEle)
         this.focusElement = tabAnchorEle;

     if (this.focusElement)
     {
          Spry.Widget.TabbedPanels.addEventListener(this.focusElement, "focus", function(e) { return self.onTabFocus(e, tab); }, false);
         Spry.Widget.TabbedPanels.addEventListener(this.focusElement, "blur", function(e) { return self.onTabBlur(e, tab); }, false);
           Spry.Widget.TabbedPanels.addEventListener(this.focusElement, "keydown", function(e) { return self.onTabKeyDown(e, tab); }, false);
     }
  }
};

Spry.Widget.TabbedPanels.prototype.showPanel = function(elementOrIndex)
{
    var tpIndex = -1;
  
   if (typeof elementOrIndex == "number")
     tpIndex = elementOrIndex;
  else // Must be the element for the tab or content panel.
      tpIndex = this.getTabIndex(elementOrIndex);
    
   if (!tpIndex < 0 || tpIndex >= this.getTabbedPanelCount())
     return;

   var tabs = this.getTabs();
 var panels = this.getContentPanels();

 var numTabbedPanels = Math.max(tabs.length, panels.length);

   for (var i = 0; i < numTabbedPanels; i++)
  {
      if (i != tpIndex)
      {
          if (tabs[i])
               this.removeClassName(tabs[i], this.tabSelectedClass);
          if (panels[i])
         {
              this.removeClassName(panels[i], this.panelVisibleClass);
               panels[i].style.display = "none";
          }
      }
  }

 this.addClassName(tabs[tpIndex], this.tabSelectedClass);
   this.addClassName(panels[tpIndex], this.panelVisibleClass);
    panels[tpIndex].style.display = "block";

  this.currentTabIndex = tpIndex;
};

Spry.Widget.TabbedPanels.prototype.attachBehaviors = function(element)
{
   var tabs = this.getTabs();
 var panels = this.getContentPanels();
  var panelCount = this.getTabbedPanelCount();

  for (var i = 0; i < panelCount; i++)
       this.addPanelEventListeners(tabs[i], panels[i]);

  this.showPanel(this.defaultTab);
};