// 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);
};