/* 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.

var Spry;
if (!Spry) Spry = {};
if (!Spry.Widget) Spry.Widget = {};

Spry.Widget.Accordion = function(element, opts)
{
    this.element = this.getElement(element);
    this.defaultPanel = 0;
    this.hoverClass = "AccordionPanelTabHover";
    this.openClass = "AccordionPanelOpen";
    this.closedClass = "AccordionPanelClosed";
    this.focusedClass = "AccordionFocused";
    this.enableAnimation = true;
    this.enableKeyboardNavigation = true;
    this.currentPanel = null;
    this.animator = null;
    this.hasFocus = null;
    this.duration = 500;

    this.previousPanelKeyCode = Spry.Widget.Accordion.KEY_UP;
    this.nextPanelKeyCode = Spry.Widget.Accordion.KEY_DOWN;

    this.useFixedPanelHeights = true;
    this.fixedPanelHeight = 0;

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

    // Unfortunately in some browsers like Safari, the Stylesheets our
    // page depends on may not have been loaded at the time we are called.
    // This means we have to defer attaching our behaviors until after the
    // onload event fires, since some of our behaviors rely on dimensions
    // specified in the CSS.

    if (Spry.Widget.Accordion.onloadDidFire)
        this.attachBehaviors();
    else
        Spry.Widget.Accordion.loadQueue.push(this);
};

Spry.Widget.Accordion.onloadDidFire = false;
Spry.Widget.Accordion.loadQueue = [];

Spry.Widget.Accordion.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.Accordion.processLoadQueue = function(handler)
{
    Spry.Widget.Accordion.onloadDidFire = true;
    var q = Spry.Widget.Accordion.loadQueue;
    var qlen = q.length;
    for (var i = 0; i < qlen; i++)
        q[i].attachBehaviors();
};

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

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

Spry.Widget.Accordion.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.Accordion.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.Accordion.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.Accordion.prototype.onPanelTabMouseOver = function(panel)
{
    if (panel)
        this.addClassName(this.getPanelTab(panel), this.hoverClass);
};

Spry.Widget.Accordion.prototype.onPanelTabMouseOut = function(panel)
{
    if (panel)
        this.removeClassName(this.getPanelTab(panel), this.hoverClass);
};

Spry.Widget.Accordion.prototype.openPanel = function(panel)
{
    var panelA = this.currentPanel;
    var panelB = panel;
    
    if (!panelB || panelA == panelB)    
        return;

    var contentA; 
    if( panelA )
        contentA = this.getPanelContent(panelA);
    var contentB = this.getPanelContent(panelB);

    if (! contentB)
        return;

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

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

    if(panelA)
    {
        this.removeClassName(panelA, this.openClass);
        this.addClassName(panelA, this.closedClass);
    }

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

    this.currentPanel = panelB;
};

Spry.Widget.Accordion.prototype.openNextPanel = function()
{
    var panels = this.getPanels();
    var curPanelIndex = this.getCurrentPanelIndex();
    
    if( panels && curPanelIndex >= 0 && (curPanelIndex+1) < panels.length )
        this.openPanel(panels[curPanelIndex+1]);
};

Spry.Widget.Accordion.prototype.openPreviousPanel = function()
{
    var panels = this.getPanels();
    var curPanelIndex = this.getCurrentPanelIndex();
    
    if( panels && curPanelIndex > 0 && curPanelIndex < panels.length )
        this.openPanel(panels[curPanelIndex-1]);
};

Spry.Widget.Accordion.prototype.openFirstPanel = function()
{
    var panels = this.getPanels();
    if( panels )
        this.openPanel(panels[0]);
};

Spry.Widget.Accordion.prototype.openLastPanel = function()
{
    var panels = this.getPanels();
    if( panels )
        this.openPanel(panels[panels.length-1]);
};

Spry.Widget.Accordion.prototype.onPanelClick = function(panel)
{
    // if (this.enableKeyboardNavigation)
    //  this.element.focus();
    if (panel != this.currentPanel)
        this.openPanel(panel);
    this.focus();
};

Spry.Widget.Accordion.prototype.onFocus = function(e)
{
    // this.element.focus();
    this.hasFocus = true;
    this.addClassName(this.element, this.focusedClass);
};

Spry.Widget.Accordion.prototype.onBlur = function(e)
{
    // this.element.blur();
    this.hasFocus = false;
    this.removeClassName(this.element, this.focusedClass);
};

Spry.Widget.Accordion.KEY_UP = 38;
Spry.Widget.Accordion.KEY_DOWN = 40;

Spry.Widget.Accordion.prototype.onKeyDown = function(e)
{
    var key = e.keyCode;
    if (!this.hasFocus || (key != this.previousPanelKeyCode && key != this.nextPanelKeyCode))
        return true;
    
    var panels = this.getPanels();
    if (!panels || panels.length < 1)
        return false;
    var currentPanel = this.currentPanel ? this.currentPanel : panels[0];
    var nextPanel = (key == this.nextPanelKeyCode) ? currentPanel.nextSibling : currentPanel.previousSibling;
    
    while (nextPanel)
    {
        if (nextPanel.nodeType == 1 /* Node.ELEMENT_NODE */)
            break;
        nextPanel = (key == this.nextPanelKeyCode) ? nextPanel.nextSibling : nextPanel.previousSibling;
    }
    
    if (nextPanel && currentPanel != nextPanel)
        this.openPanel(nextPanel);

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

    return false;
};

Spry.Widget.Accordion.prototype.attachPanelHandlers = function(panel)
{
    if (!panel)
        return;

    var tab = this.getPanelTab(panel);

    if (tab)
    {
        var self = this;
        Spry.Widget.Accordion.addEventListener(tab, "click", function(e) { return self.onPanelClick(panel); }, false);
        Spry.Widget.Accordion.addEventListener(tab, "mouseover", function(e) { return self.onPanelTabMouseOver(panel); }, false);
        Spry.Widget.Accordion.addEventListener(tab, "mouseout", function(e) { return self.onPanelTabMouseOut(panel); }, false);
    }
};

Spry.Widget.Accordion.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.Accordion.prototype.initPanel = function(panel, isDefault)
{
    var content = this.getPanelContent(panel);
    if (isDefault)
    {
        this.currentPanel = panel;
        this.removeClassName(panel, this.closedClass);
        this.addClassName(panel, this.openClass);
    }
    else
    {
        this.removeClassName(panel, this.openClass);
        this.addClassName(panel, this.closedClass);
        content.style.height = "0px";
    }
    
    this.attachPanelHandlers(panel);
};

Spry.Widget.Accordion.prototype.attachBehaviors = function()
{
    var panels = this.getPanels();
    for (var i = 0; i < panels.length; i++)
    {
        this.initPanel(panels[i], i == this.defaultPanel);
    }

    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.

        var tabIndexAttr = this.element.attributes.getNamedItem("tabindex");
        // if (!tabIndexAttr) this.element.tabindex = 0;
        if (tabIndexAttr)
        {
            var self = this;
            Spry.Widget.Accordion.addEventListener(this.element, "focus", function(e) { return self.onFocus(e); }, false);
            Spry.Widget.Accordion.addEventListener(this.element, "blur", function(e) { return self.onBlur(e); }, false);
            Spry.Widget.Accordion.addEventListener(this.element, "keydown", function(e) { return self.onKeyDown(e); }, false);
        }
    }
};

Spry.Widget.Accordion.prototype.getPanels = function()
{
    return this.getElementChildren(this.element);
};

Spry.Widget.Accordion.prototype.getCurrentPanel = function()
{
    return this.currentPanel;
};

Spry.Widget.Accordion.prototype.getCurrentPanelIndex = function()
{
    var panels = this.getPanels();
    for( var i = 0 ; i < panels.length; i++ )
    {
        if( this.currentPanel == panels[i] )
            return i;
    }
    return 0;
};

Spry.Widget.Accordion.prototype.getPanelTab = function(panel)
{
    if (!panel)
        return null;
    return this.getElementChildren(panel)[0];
};

Spry.Widget.Accordion.prototype.getPanelContent = function(panel)
{
    if (!panel)
        return null;
    return this.getElementChildren(panel)[1];
};

Spry.Widget.Accordion.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.Accordion.prototype.focus = function()
{
    if (this.element && this.element.focus)
        this.element.focus();
};

/////////////////////////////////////////////////////

Spry.Widget.Accordion.PanelAnimator = 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 = (p == panel) ? (accordion.useFixedPanelHeights ? accordion.fixedPanelHeight : c.scrollHeight) : 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.PanelAnimator.prototype.start = function()
{
    var self = this;
    this.timer = setTimeout(function() { self.stepAnimation(); }, this.interval);
};

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

    this.animate();

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

Spry.Widget.Accordion.PanelAnimator.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";
        }
    }
};

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