// SpryAccordion.js - version 0.17 - 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.

(function () { // BeginSpryComponent

    if (typeof Spry == "undefined") window.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);

        if (this.element)
            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);
    };

})(); // EndSpryComponent