/* 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.
//if (Array.prototype.slice==null) Array.prototype.slice=function(start,end){ 

Spry.Widget.Accordion.prototype.onPanelClick = function(panel)
{
	// if (this.enableKeyboardNavigation)
	// 	this.element.focus();
	if (panel != this.currentPanel)
		this.openPanel(panel);
	else //current panel is clicked again
	{
		this.closePanel(panel);	//close it
	}
	this.focus();
};

Spry.Widget.Accordion.prototype.closePanel = function(panel)
{
	var panelB = panel;
	
	if (!panelB)	
		return;

	var contentB = this.getPanelContent(panelB);

	if (! contentB)
		return;

	if (this.useFixedPanelHeights && !this.fixedPanelHeight)
	{
		this.fixedPanelHeight = (contentB.offsetHeight) ? contentB.offsetHeight : contentB.scrollHeight;
	}

	if (this.enableAnimation)
	{
		if (this.animator)
			this.animator.stop();
		this.closeAnimator = new Spry.Widget.Accordion.PanelCloseAnimator(this, panelB, { duration: this.duration });
		this.closeAnimator.start();
	}
	else
	{
		if(contentA)
			contentA.style.height = "0px";
		contentB.style.height = (this.useFixedPanelHeights ? this.fixedPanelHeight : contentB.scrollHeight) + "px";
	}

	this.removeClassName(panelB, this.openClass);
	this.addClassName(panelB, this.closedClass);

	this.currentPanel = null;
};

Spry.Widget.Accordion.PanelCloseAnimator = 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 = 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.PanelCloseAnimator.prototype.start = function()
{
	var self = this;
	this.timer = setTimeout(function() { self.stepAnimation(); }, this.interval);
};

Spry.Widget.Accordion.PanelCloseAnimator.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.PanelCloseAnimator.prototype.stepAnimation = function()
{
	++this.stepCount;

	this.animate();

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

Spry.Widget.Accordion.PanelCloseAnimator.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";
		}
	}
};