// SprySlidingPanels.js - version 0.5 - Spry Pre-Release 1.6

//

// 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.SlidingPanels = function(element, opts)

{

	this.element = this.getElement(element);

	this.enableAnimation = true;

	this.currentPanel = null;

	this.enableKeyboardNavigation = true;

	this.hasFocus = false;

	this.previousPanelKeyCode = Spry.Widget.SlidingPanels.KEY_LEFT;

	this.nextPanelKeyCode = Spry.Widget.SlidingPanels.KEY_RIGHT;



	this.currentPanelClass = "SlidingPanelsCurrentPanel";

	this.focusedClass = "SlidingPanelsFocused";

	this.animatingClass = "SlidingPanelsAnimating";



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



	if (this.element)

		this.element.style.overflow = "hidden";



	// Developers can specify the default panel as an index,

	// id or an actual element node. Make sure to normalize

	// it into an element node because that is what we expect

	// internally.



	if (this.defaultPanel)

	{

		if (typeof this.defaultPanel == "number")

			this.currentPanel = this.getContentPanels()[this.defaultPanel];

		else

			this.currentPanel = this.getElement(this.defaultPanel);

	}



	// If we still don't have a current panel, use the first one!



	if (!this.currentPanel)

		this.currentPanel = this.getContentPanels()[0];



	// Since we rely on the positioning information of the

	// panels, we need to wait for the onload event to fire before

	// we can attempt to show the initial panel. Once the onload

	// fires, we know that all CSS files have loaded. This is

	// especially important for Safari.



	if (Spry.Widget.SlidingPanels.onloadDidFire)

		this.attachBehaviors();

	else

		Spry.Widget.SlidingPanels.loadQueue.push(this);

};



Spry.Widget.SlidingPanels.prototype.onFocus = function(e)

{

	this.hasFocus = true;

	this.addClassName(this.element, this.focusedClass);

	return false;

};



Spry.Widget.SlidingPanels.prototype.onBlur = function(e)

{

	this.hasFocus = false;

	this.removeClassName(this.element, this.focusedClass);

	return false;

};



Spry.Widget.SlidingPanels.KEY_LEFT = 37;

Spry.Widget.SlidingPanels.KEY_UP = 38;

Spry.Widget.SlidingPanels.KEY_RIGHT = 39;

Spry.Widget.SlidingPanels.KEY_DOWN = 40;



Spry.Widget.SlidingPanels.prototype.onKeyDown = function(e)

{

	var key = e.keyCode;

	if (!this.hasFocus || (key != this.previousPanelKeyCode && key != this.nextPanelKeyCode))

		return true;



	if (key == this.nextPanelKeyCode)

		this.showNextPanel();

	else /* if (key == this.previousPanelKeyCode) */

		this.showPreviousPanel();



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

	else e.returnValue = false;

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

	else e.cancelBubble = true;



	return false;

};



Spry.Widget.SlidingPanels.prototype.attachBehaviors = function()

{

	var ele = this.element;

	if (!ele)

		return;



	if (this.enableKeyboardNavigation)

	{

		var focusEle = null;

		var tabIndexAttr = ele.attributes.getNamedItem("tabindex");

		if (tabIndexAttr || ele.nodeName.toLowerCase() == "a")

			focusEle = ele;

	

		if (focusEle)

		{

			var self = this;

			Spry.Widget.SlidingPanels.addEventListener(focusEle, "focus", function(e) { return self.onFocus(e || window.event); }, false);

			Spry.Widget.SlidingPanels.addEventListener(focusEle, "blur", function(e) { return self.onBlur(e || window.event); }, false);

			Spry.Widget.SlidingPanels.addEventListener(focusEle, "keydown", function(e) { return self.onKeyDown(e || window.event); }, false);

		}

	}



	if (this.currentPanel)

	{

		// Temporarily turn off animation when showing the

		// initial panel.



		var ea = this.enableAnimation;

		this.enableAnimation = false;

		this.showPanel(this.currentPanel);

		this.enableAnimation = ea;

	}

};



Spry.Widget.SlidingPanels.prototype.getElement = function(ele)

{

	if (ele && typeof ele == "string")

		return document.getElementById(ele);

	return ele;

};



Spry.Widget.SlidingPanels.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.SlidingPanels.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.SlidingPanels.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.SlidingPanels.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.SlidingPanels.prototype.getCurrentPanel = function()

{

	return this.currentPanel;

};



Spry.Widget.SlidingPanels.prototype.getContentGroup = function()

{

	return this.getElementChildren(this.element)[0];

};



Spry.Widget.SlidingPanels.prototype.getContentPanels = function()

{

	return this.getElementChildren(this.getContentGroup());

};



Spry.Widget.SlidingPanels.prototype.getContentPanelsCount = function()

{

	return this.getContentPanels().length;

};



Spry.Widget.SlidingPanels.onloadDidFire = false;

Spry.Widget.SlidingPanels.loadQueue = [];



Spry.Widget.SlidingPanels.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.SlidingPanels.processLoadQueue = function(handler)

{

	Spry.Widget.SlidingPanels.onloadDidFire = true;

	var q = Spry.Widget.SlidingPanels.loadQueue;

	var qlen = q.length;

	for (var i = 0; i < qlen; i++)

		q[i].attachBehaviors();

};



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



Spry.Widget.SlidingPanels.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.SlidingPanels.prototype.getContentPanelIndex = function(ele)

{

	if (ele)

	{

		ele = this.getElement(ele);

		var panels = this.getContentPanels();

		var numPanels = panels.length;

		for (var i = 0; i < numPanels; i++)

		{

			if (panels[i] == ele)

				return i;

		}

	}

	return -1;

};



Spry.Widget.SlidingPanels.prototype.showPanel = function(elementOrIndex)

{

	var pIndex = -1;

	

	if (typeof elementOrIndex == "number")

		pIndex = elementOrIndex;

	else // Must be the element for the content panel.

		pIndex = this.getContentPanelIndex(elementOrIndex);



	var numPanels = this.getContentPanelsCount();

	if (numPanels > 0)

		pIndex = (pIndex >= numPanels) ? numPanels - 1 : pIndex;

	else

		pIndex = 0;



	var panel = this.getContentPanels()[pIndex];

	var contentGroup = this.getContentGroup();



	if (panel && contentGroup)

	{

		if (this.currentPanel)

			this.removeClassName(this.currentPanel, this.currentPanelClass);

		this.currentPanel = panel;



		var nx = -panel.offsetLeft;

		var ny = -panel.offsetTop;



		if (this.enableAnimation)

		{

			if (this.animator)

				this.animator.stop();

			var cx = contentGroup.offsetLeft;

			var cy = contentGroup.offsetTop;

			if (cx != nx || cy != ny)

			{

				var self = this;

				this.addClassName(this.element, this.animatingClass);

				this.animator = new Spry.Widget.SlidingPanels.PanelAnimator(contentGroup, cx, cy, nx, ny, { duration: this.duration, fps: this.fps, transition: this.transition, finish: function()

				{

					self.removeClassName(self.element, self.animatingClass);

					self.addClassName(panel, self.currentPanelClass);

				} });

				this.animator.start();

			}

		}

		else

		{

			contentGroup.style.left = nx + "px";

			contentGroup.style.top = ny + "px";

			this.addClassName(panel, this.currentPanelClass);

		}

	}



	return panel;

};



Spry.Widget.SlidingPanels.prototype.showFirstPanel = function()

{

	return this.showPanel(0);

};



Spry.Widget.SlidingPanels.prototype.showLastPanel = function()

{

	return this.showPanel(this.getContentPanels().length - 1);

};



Spry.Widget.SlidingPanels.prototype.showPreviousPanel = function()

{

	return this.showPanel(this.getContentPanelIndex(this.currentPanel) - 1);

};



Spry.Widget.SlidingPanels.prototype.showNextPanel = function()

{

	return this.showPanel(this.getContentPanelIndex(this.currentPanel) + 1);

};



Spry.Widget.SlidingPanels.prototype.getMyCurrentPanelIndex = function()

{

	return this.getContentPanelIndex(this.currentPanel);

};






Spry.Widget.SlidingPanels.PanelAnimator = function(ele, curX, curY, dstX, dstY, opts)

{

	this.element = ele;



	this.curX = curX;

	this.curY = curY;

	this.dstX = dstX;

	this.dstY = dstY;

	this.fps = 60;

	this.duration = 500;

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

	this.startTime = 0;

	this.timerID = 0;

	this.finish = null;



	var self = this;

	this.intervalFunc = function() { self.step(); };

	

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



	this.interval = 1000/this.fps;

};



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



Spry.Widget.SlidingPanels.PanelAnimator.prototype.start = function()

{

	this.stop();

	this.startTime = (new Date()).getTime();

	this.timerID = setTimeout(this.intervalFunc, this.interval);

};



Spry.Widget.SlidingPanels.PanelAnimator.prototype.stop = function()

{

	if (this.timerID)

		clearTimeout(this.timerID);

	this.timerID = 0;

};



Spry.Widget.SlidingPanels.PanelAnimator.prototype.step = function()

{

	var elapsedTime = (new Date()).getTime() - this.startTime;

	var done = elapsedTime >= this.duration;

	var x, y;



	if (done)

	{

		x = this.curX = this.dstX;

		y = this.curY = this.dstY;

	}

	else

	{

		x = this.transition(elapsedTime, this.curX, this.dstX - this.curX, this.duration);

		y = this.transition(elapsedTime, this.curY, this.dstY - this.curY, this.duration);

	}



	this.element.style.left = x + "px";

	this.element.style.top = y + "px";



	if (!done)

		this.timerID = setTimeout(this.intervalFunc, this.interval);

	else if (this.finish)

		this.finish();

};