// SpryAccordion.js - version 0.15 - 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.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.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);



    this.attachBehaviors();

};



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(e, panel)

{

    if (panel)

        this.addClassName(this.getPanelTab(panel), this.hoverClass);

    return false;

};



Spry.Widget.Accordion.prototype.onPanelTabMouseOut = function(e, panel)

{

    if (panel)

        this.removeClassName(this.getPanelTab(panel), this.hoverClass);

    return false;

};



Spry.Widget.Accordion.prototype.openPanel = function(elementOrIndex)

{

    var panelA = this.currentPanel;

    var panelB;



    if (typeof elementOrIndex == "number")

        panelB = this.getPanels()[elementOrIndex];

    else

        panelB = this.getElement(elementOrIndex);

    

    if (!panelB || panelA == panelB)    

        return null;



    var contentA = panelA ? this.getPanelContent(panelA) : null;

    var contentB = this.getPanelContent(panelB);



    if (!contentB)

        return null;



    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, fps: this.fps, transition: this.transition });

        this.animator.start();

    }

    else

    {

        if(contentA)

        {

            contentA.style.display = "none";

            contentA.style.height = "0px";

        }

        contentB.style.display = "block";

        contentB.style.height = this.useFixedPanelHeights ? this.fixedPanelHeight + "px" : "auto";

    }



    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;



    return panelB;

};



Spry.Widget.Accordion.prototype.closePanel = function()

{

    // The accordion can only ever have one panel open at any

    // give time, so this method only closes the current panel.

    // If the accordion is in fixed panel heights mode, this

    // method does nothing.



    if (!this.useFixedPanelHeights && this.currentPanel)

    {

        var panel = this.currentPanel;

        var content = this.getPanelContent(panel);

        if (content)

        {

            if (this.enableAnimation)

            {

                if (this.animator)

                    this.animator.stop();

                this.animator = new Spry.Widget.Accordion.PanelAnimator(this, null, { duration: this.duration, fps: this.fps, transition: this.transition });

                this.animator.start();

            }

            else

            {

                content.style.display = "none";

                content.style.height = "0px";

            }

        }       

        this.removeClassName(panel, this.openClass);

        this.addClassName(panel, this.closedClass);

        this.currentPanel = null;

    }

};



Spry.Widget.Accordion.prototype.openNextPanel = function()

{

    return this.openPanel(this.getCurrentPanelIndex() + 1);

};



Spry.Widget.Accordion.prototype.openPreviousPanel = function()

{

    return this.openPanel(this.getCurrentPanelIndex() - 1);

};



Spry.Widget.Accordion.prototype.openFirstPanel = function()

{

    return this.openPanel(0);

};



Spry.Widget.Accordion.prototype.openLastPanel = function()

{

    var panels = this.getPanels();

    return this.openPanel(panels[panels.length - 1]);

};



Spry.Widget.Accordion.prototype.onPanelTabClick = function(e, panel)

{

    if (panel != this.currentPanel)

        this.openPanel(panel);

    else

        this.closePanel();



    if (this.enableKeyboardNavigation)

        this.focus();



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

    else e.returnValue = false;

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

    else e.cancelBubble = true;



    return false;

};



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

{

    this.hasFocus = true;

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

    return false;

};



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

{

    this.hasFocus = false;

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

    return false;

};



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.preventDefault) e.preventDefault();

    else e.returnValue = false;

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

    else e.cancelBubble = true;



    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.onPanelTabClick(e, panel); }, false);

        Spry.Widget.Accordion.addEventListener(tab, "mouseover", function(e) { return self.onPanelTabMouseOver(e, panel); }, false);

        Spry.Widget.Accordion.addEventListener(tab, "mouseout", function(e) { return self.onPanelTabMouseOut(e, 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);



        // Attempt to set up the height of the default panel. We don't want to

        // do any dynamic panel height calculations here because our accordion

        // or one of its parent containers may be display:none.



        if (content)

        {

            if (this.useFixedPanelHeights)

            {

                // We are in fixed panel height mode and the user passed in

                // a panel height for us to use.

    

                if (this.fixedPanelHeight)

                    content.style.height = this.fixedPanelHeight + "px";

            }

            else

            {

                // We are in variable panel height mode, but since we can't

                // calculate the panel height here, we just set the height to

                // auto so that it expands to show all of its content.

    

                content.style.height = "auto";

            }

        }

    }

    else

    {

        this.removeClassName(panel, this.openClass);

        this.addClassName(panel, this.closedClass);



        if (content)

        {

            content.style.height = "0px";

            content.style.display = "none";

        }

    }

    

    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);



    // Advanced keyboard navigation requires the tabindex attribute

    // on the top-level element.



    this.enableKeyboardNavigation = (this.enableKeyboardNavigation && this.element.attributes.getNamedItem("tabindex"));

    if (this.enableKeyboardNavigation)

    {

        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.getPanelIndex = function(panel)

{

    var panels = this.getPanels();

    for( var i = 0 ; i < panels.length; i++ )

    {

        if( panel == panels[i] )

            return i;

    }

    return -1;

};



Spry.Widget.Accordion.prototype.getCurrentPanelIndex = function()

{

    return this.getPanelIndex(this.currentPanel);

};



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.prototype.blur = function()

{

    if (this.element && this.element.blur)

        this.element.blur();

};



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



Spry.Widget.Accordion.PanelAnimator = function(accordion, panel, opts)

{

    this.timer = null;

    this.interval = 0;



    this.fps = 60;

    this.duration = 500;

    this.startTime = 0;



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



    this.onComplete = null;



    this.panel = panel;

    this.panelToOpen = accordion.getElement(panel);

    this.panelData = [];

    this.useFixedPanelHeights = accordion.useFixedPanelHeights;



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



    this.interval = Math.floor(1000 / this.fps);



    // 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)

                c.style.display = "block";



            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.distance = obj.toHeight - obj.fromHeight;

                obj.overflow = c.style.overflow;

                this.panelData.push(obj);



                c.style.overflow = "hidden";

                c.style.height = h + "px";

            }

        }

    }

};



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



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

{

    var self = this;

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

    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!



        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()

{

    var curTime = (new Date).getTime();

    var elapsedTime = curTime - this.startTime;



    var i, obj;



    if (elapsedTime >= this.duration)

    {

        for (i = 0; i < this.panelData.length; i++)

        {

            obj = this.panelData[i];

            if (obj.panel != this.panel)

            {

                obj.content.style.display = "none";

                obj.content.style.height = "0px";

            }

            obj.content.style.overflow = obj.overflow;

            obj.content.style.height = (this.useFixedPanelHeights || obj.toHeight == 0) ? obj.toHeight + "px" : "auto";

        }

        if (this.onComplete)

            this.onComplete();

        return;

    }



    for (i = 0; i < this.panelData.length; i++)

    {

        obj = this.panelData[i];

        var ht = this.transition(elapsedTime, obj.fromHeight, obj.distance, this.duration);

        obj.content.style.height = ((ht < 0) ? 0 : ht) + "px";

    }

    

    var self = this;

    this.timer = setTimeout(function() { self.stepAnimation(); }, this.interval);

};