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/* 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";
                }
        }
};