// 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);
};