/* SpryTabbedPanels.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.TabbedPanels = function(element, opts) {
    this.element = this.getElement(element);
    this.defaultTab = 0; // Show the first panel by default.
    this.bindings = [];
    this.tabSelectedClass = "TabbedPanelsTabSelected";
    this.tabHoverClass = "TabbedPanelsTabHover";
    this.tabFocusedClass = "TabbedPanelsTabFocused";
    this.panelVisibleClass = "TabbedPanelsContentVisible";
    this.focusElement = null;
    this.hasFocus = false;
    this.currentTabIndex = 0;
    this.enableKeyboardNavigation = true;

    Spry.Widget.TabbedPanels.setOptions(this, opts);

    // If the defaultTab is expressed as a number/index, convert
    // it to an element.

    if (typeof(this.defaultTab) == "number") {
        if (this.defaultTab < 0) this.defaultTab = 0;
        else {
            var count = this.getTabbedPanelCount();
            if (this.defaultTab >= count) this.defaultTab = (count > 1) ? (count - 1) : 0;
        }

        this.defaultTab = this.getTabs()[this.defaultTab];
    }

    // The defaultTab property is supposed to be the tab element for the tab content
    // to show by default. The caller is allowed to pass in the element itself or the
    // element's id, so we need to convert the current value to an element if necessary.

    if (this.defaultTab) this.defaultTab = this.getElement(this.defaultTab);

    this.attachBehaviors();
};

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

Spry.Widget.TabbedPanels.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.TabbedPanels.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.TabbedPanels.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.TabbedPanels.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.TabbedPanels.prototype.getTabGroup = function() {
    if (this.element) {
        var children = this.getElementChildren(this.element);
        if (children.length) return children[0];
    }
    return null;
};

Spry.Widget.TabbedPanels.prototype.getTabs = function() {
    var tabs = [];
    var tg = this.getTabGroup();
    if (tg) tabs = this.getElementChildren(tg);
    return tabs;
};

Spry.Widget.TabbedPanels.prototype.getContentPanelGroup = function() {
    if (this.element) {
        var children = this.getElementChildren(this.element);
        if (children.length > 1) return children[1];
    }
    return null;
};

Spry.Widget.TabbedPanels.prototype.getContentPanels = function() {
    var panels = [];
    var pg = this.getContentPanelGroup();
    if (pg) panels = this.getElementChildren(pg);
    return panels;
};

Spry.Widget.TabbedPanels.prototype.getIndex = function(ele, arr) {
    ele = this.getElement(ele);
    if (ele && arr && arr.length) {
        for (var i = 0; i < arr.length; i++) {
            if (ele == arr[i]) return i;
        }
    }
    return - 1;
};

Spry.Widget.TabbedPanels.prototype.getTabIndex = function(ele) {
    var i = this.getIndex(ele, this.getTabs());
    if (i < 0) i = this.getIndex(ele, this.getContentPanels());
    return i;
};

Spry.Widget.TabbedPanels.prototype.getCurrentTabIndex = function() {
    return this.currentTabIndex;
};

Spry.Widget.TabbedPanels.prototype.getTabbedPanelCount = function(ele) {
    return Math.min(this.getTabs().length, this.getContentPanels().length);
};

Spry.Widget.TabbedPanels.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.TabbedPanels.prototype.onTabClick = function(e, tab) {
    this.showPanel(tab);
};

Spry.Widget.TabbedPanels.prototype.onTabMouseOver = function(e, tab) {
    this.addClassName(tab, this.tabHoverClass);
};

Spry.Widget.TabbedPanels.prototype.onTabMouseOut = function(e, tab) {
    this.removeClassName(tab, this.tabHoverClass);
};

Spry.Widget.TabbedPanels.prototype.onTabFocus = function(e, tab) {
    this.hasFocus = true;
    this.addClassName(this.element, this.tabFocusedClass);
};

Spry.Widget.TabbedPanels.prototype.onTabBlur = function(e, tab) {
    this.hasFocus = false;
    this.removeClassName(this.element, this.tabFocusedClass);
};

Spry.Widget.TabbedPanels.ENTER_KEY = 13;
Spry.Widget.TabbedPanels.SPACE_KEY = 32;

Spry.Widget.TabbedPanels.prototype.onTabKeyDown = function(e, tab) {
    var key = e.keyCode;
    if (!this.hasFocus || (key != Spry.Widget.TabbedPanels.ENTER_KEY && key != Spry.Widget.TabbedPanels.SPACE_KEY)) return true;

    this.showPanel(tab);

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

    return false;
};

Spry.Widget.TabbedPanels.prototype.preorderTraversal = function(root, func) {
    var stopTraversal = false;
    if (root) {
        stopTraversal = func(root);
        if (root.hasChildNodes()) {
            var child = root.firstChild;
            while (!stopTraversal && child) {
                stopTraversal = this.preorderTraversal(child, func);
                try {
                    child = child.nextSibling;
                } catch(e) {
                    child = null;
                }
            }
        }
    }
    return stopTraversal;
};

Spry.Widget.TabbedPanels.prototype.addPanelEventListeners = function(tab, panel) {
    var self = this;
    Spry.Widget.TabbedPanels.addEventListener(tab, "click",
    function(e) {
        return self.onTabClick(e, tab);
    },
    false);
    Spry.Widget.TabbedPanels.addEventListener(tab, "mouseover",
    function(e) {
        return self.onTabMouseOver(e, tab);
    },
    false);
    Spry.Widget.TabbedPanels.addEventListener(tab, "mouseout",
    function(e) {
        return self.onTabMouseOut(e, tab);
    },
    false);

    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.

        // Find the first element within the tab container that has a tabindex or the first
        // anchor tag.

        var tabIndexEle = null;
        var tabAnchorEle = null;

        this.preorderTraversal(tab,
        function(node) {
            if (node.nodeType == 1
            /* NODE.ELEMENT_NODE */
            ) {
                var tabIndexAttr = tab.attributes.getNamedItem("tabindex");
                if (tabIndexAttr) {
                    tabIndexEle = node;
                    return true;
                }
                if (!tabAnchorEle && node.nodeName.toLowerCase() == "a") tabAnchorEle = node;
            }
            return false;
        });

        if (tabIndexEle) this.focusElement = tabIndexEle;
        else if (tabAnchorEle) this.focusElement = tabAnchorEle;

        if (this.focusElement) {
            Spry.Widget.TabbedPanels.addEventListener(this.focusElement, "focus",
            function(e) {
                return self.onTabFocus(e, tab);
            },
            false);
            Spry.Widget.TabbedPanels.addEventListener(this.focusElement, "blur",
            function(e) {
                return self.onTabBlur(e, tab);
            },
            false);
            Spry.Widget.TabbedPanels.addEventListener(this.focusElement, "keydown",
            function(e) {
                return self.onTabKeyDown(e, tab);
            },
            false);
        }
    }
};

Spry.Widget.TabbedPanels.prototype.showPanel = function(elementOrIndex) {
    var tpIndex = -1;

    if (typeof elementOrIndex == "number") tpIndex = elementOrIndex;
    else // Must be the element for the tab or content panel.
    tpIndex = this.getTabIndex(elementOrIndex);

    if (!tpIndex < 0 || tpIndex >= this.getTabbedPanelCount()) return;

    var tabs = this.getTabs();
    var panels = this.getContentPanels();

    var numTabbedPanels = Math.max(tabs.length, panels.length);

    for (var i = 0; i < numTabbedPanels; i++) {
        if (i != tpIndex) {
            if (tabs[i]) this.removeClassName(tabs[i], this.tabSelectedClass);
            if (panels[i]) {
                this.removeClassName(panels[i], this.panelVisibleClass);
                panels[i].style.display = "none";
            }
        }
    }

    this.addClassName(tabs[tpIndex], this.tabSelectedClass);
    this.addClassName(panels[tpIndex], this.panelVisibleClass);
    panels[tpIndex].style.display = "block";

    this.currentTabIndex = tpIndex;
};

Spry.Widget.TabbedPanels.prototype.attachBehaviors = function(element) {
    var tabs = this.getTabs();
    var panels = this.getContentPanels();
    var panelCount = this.getTabbedPanelCount();

    for (var i = 0; i < panelCount; i++) this.addPanelEventListeners(tabs[i], panels[i]);

    this.showPanel(this.defaultTab);
};