# Yahoo! UI Library

### widget 3.0.0b1

Yahoo! UI Library > widget > Widget.js (source view)
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    /**
     * Provides the base Widget class
     *
     * @module widget
     */

    // Local Constants
    var L = Y.Lang,
        O = Y.Object,
        Node = Y.Node,
        ClassNameManager = Y.ClassNameManager,

        WIDGET = "widget",
        CONTENT = "content",
        VISIBLE = "visible",
        HIDDEN = "hidden",
        DISABLED = "disabled",
        FOCUSED = "focused",
        WIDTH = "width",
        HEIGHT = "height",
        EMPTY = "",
        HYPHEN = "-",
        BOUNDING_BOX = "boundingBox",
        CONTENT_BOX = "contentBox",
        PARENT_NODE = "parentNode",
        FIRST_CHILD = "firstChild",
        OWNER_DOCUMENT = "ownerDocument",
        BODY = "body",
    	TAB_INDEX = "tabIndex",
        LOCALE = "locale",
        INIT_VALUE = "initValue",
        ID = "id",
        RENDER = "render",
        RENDERED = "rendered",
        DESTROYED = "destroyed",

        ContentUpdate = "contentUpdate",

        // Widget nodeid-to-instance map for now, 1-to-1.
        _instances = {};

    /**
     * A base class for widgets, providing:
     * <ul>
     *    <li>The render lifecycle method, in addition to the init and destroy
     *        lifecycle methods provide by Base</li>
     *    <li>Abstract methods to support consistent MVC structure across
     *        widgets: renderer, renderUI, bindUI, syncUI</li>
     *    <li>Support for common widget attributes, such as boundingBox, contentBox, visible,
     *        disabled, focused, strings</li>
     * </ul>
     *
     * @param config {Object} Object literal specifying widget configuration
     * properties.
     *
     * @class Widget
     * @constructor
     * @extends Base
     */
    function Widget(config) {
        Y.log('constructor called', 'life', 'widget');

        this._yuid = Y.guid(WIDGET);
        this._strings = {};

        Widget.superclass.constructor.apply(this, arguments);
    }

    /**
     * The build configuration for the Widget class.
     * <p>
     * Defines the static fields which need to be aggregated,
     * when this class is used as the main class passed to
     * the <a href="Base.html#method_build">Base.build</a> method.
     * </p>
     * @property _buildCfg
     * @type Object
     * @static
     * @final
     * @private
     */
    Widget._buildCfg = {
        aggregates : ["HTML_PARSER"]
    };

    /**
     * Static property provides a string to identify the class.
     * <p>
     * Currently used to apply class identifiers to the bounding box
     * and to classify events fired by the widget.
     * </p>
     *
     * @property Widget.NAME
     * @type String
     * @static
     */
    Widget.NAME = WIDGET;

    /**
     * Constant used to identify state changes originating from
     * the DOM (as opposed to the JavaScript model).
     *
     * @property Widget.UI_SRC
     * @type String
     * @static
     * @final
     */
    Widget.UI_SRC = "ui";

    var UI = Widget.UI_SRC;

    /**
     * Static property used to define the default attribute
     * configuration for the Widget.
     *
     * @property Widget.ATTRS
     * @type Object
     * @static
     */
    Widget.ATTRS = {

        /**
         * Flag indicating whether or not this object
         * has been through the render lifecycle phase.
         *
         * @attribute rendered
         * @readOnly
         * @default false
         * @type boolean
         */
        rendered: {
            value:false,
            readOnly:true
        },

        /**
        * @attribute boundingBox
        * @description The outermost DOM node for the Widget, used for sizing and positioning
        * of a Widget as well as a containing element for any decorator elements used
        * for skinning.
        * @type Node
        */
        boundingBox: {
            value:null,
            setter: function(node) {
                return this._setBoundingBox(node);
            },
            writeOnce: true
        },

        /**
        * @attribute contentBox
        * @description A DOM node that is a direct descendent of a Widget's bounding box that
        * houses its content.
        * @type Node
        */
        contentBox: {
            value:null,
            setter: function(node) {
                return this._setContentBox(node);
            },
            writeOnce: true
        },

        /**
        * @attribute tabIndex
        * @description Number (between -32767 to 32767) indicating the widget's
    	* position in the default tab flow.  The value is used to set the
    	* "tabIndex" attribute on the widget's bounding box.  Negative values allow
    	* the widget to receive DOM focus programmatically (by calling the focus
    	* method), while being removed from the default tab flow.  A value of
    	* null removes the "tabIndex" attribute from the widget's bounding box.
        * @type Number
    	* @default null
        */
        tabIndex: {

    		value: 0,
    		validator: function (val) {
                return (L.isNumber(val) || L.isNull(val));
            }

        },

        /**
        * @attribute focused
        * @description Boolean indicating if the Widget, or one of its descendants,
    	* has focus.
        * @readOnly
        * @default false
        * @type boolean
        */
        focused: {
            value: false,
            readOnly:true
        },

        /**
        * @attribute disabled
        * @description Boolean indicating if the Widget should be disabled. The disabled implementation
        * is left to the specific classes extending widget.
        * @default false
        * @type boolean
        */
        disabled: {
            value: false
        },

        /**
        * @attribute visible
        * @description Boolean indicating weather or not the Widget is visible.
        * @default true
        * @type boolean
        */
        visible: {
            value: true
        },

        /**
        * @attribute height
        * @description String with units, or number, representing the height of the Widget. If a number is provided,
        * the default unit, defined by the Widgets DEF_UNIT, property is used.
        * @default ""
        * @type {String | Number}
        */
        height: {
            value: EMPTY
        },

        /**
        * @attribute width
        * @description String with units, or number, representing the width of the Widget. If a number is provided,
        * the default unit, defined by the Widgets DEF_UNIT, property is used.
        * @default ""
        * @type {String | Number}
        */
        width: {
            value: EMPTY
        },

        /**
         * @attribute moveStyles
         * @description Flag defining whether or not style properties from the content box
         * should be moved to the bounding box when wrapped (as defined by the WRAP_STYLES property)
         * @default false
         * @type boolean
         */
        moveStyles: {
            value: false
        },

        /**
         * @attribute locale
         * @description
         * The default locale for the widget. NOTE: Using get/set on the "strings" attribute will
         * return/set strings for this locale.
         * @default "en"
         * @type String
         */
        locale : {
            value: "en"
        },

        /**
         * @attribute strings
         * @description Collection of strings used to label elements of the Widget's UI.
         * @default null
         * @type Object
         */
        strings: {
            setter: function(val) {
                return this._setStrings(val, this.get(LOCALE));
            },

            getter: function() {
                return this.getStrings(this.get(LOCALE));
            }
        }
    };

    /**
     * Cached lowercase version of Widget.NAME
     *
     * @property Widget._NAME_LOWERCASE
     * @private
     * @static
     */
    Widget._NAME_LOWERCASE = Widget.NAME.toLowerCase();

    /**
     * Generate a standard prefixed classname for the Widget, prefixed by the default prefix defined
     * by the <code>Y.config.classNamePrefix</code> attribute used by <code>ClassNameManager</code> and
     * <code>Widget.NAME.toLowerCase()</code> (e.g. "yui-widget-xxxxx-yyyyy", based on default values for
     * the prefix and widget class name).
     * <p>
     * The instance based version of this method can be used to generate standard prefixed classnames,
     * based on the instances NAME, as opposed to Widget.NAME. This method should be used when you
     * need to use a constant class name across different types instances.
     * </p>
     * @method getClassName
     * @param {String*} args* 0..n strings which should be concatenated, using the default separator defined by ClassNameManager, to create the class name
     */
    Widget.getClassName = function() {
    	var args = Y.Array(arguments, 0, true);
    	args.splice(0, 0, this._NAME_LOWERCASE);
    	return ClassNameManager.getClassName.apply(ClassNameManager, args);
    };

    /**
     * Returns the widget instance whose bounding box contains, or is, the given node.
     * <p>
     * In the case of nested widgets, the nearest bounding box ancestor is used to
     * return the widget instance.
     * </p>
     * @method Widget.getByNode
     * @static
     * @param node {Node | String} The node for which to return a Widget instance. If a selector
     * string is passed in, which selects more than one node, the first node found is used.
     * @return {Widget} Widget instance, or null if not found.
     */
    Widget.getByNode = function(node) {
        var widget,
            bbMarker = Widget.getClassName();

        node = Node.get(node);
        if (node) {
            node = (node.hasClass(bbMarker)) ? node : node.ancestor("." + bbMarker);
            if (node) {
                widget = _instances[node.get(ID)];
            }
        }

        return widget || null;
    };

    /**
     * Object hash, defining how attribute values are to be parsed from
     * markup contained in the widget's content box. e.g.:
     * <pre>
     *   {
     *       // Set single Node references using selector syntax
     *       // (selector is run through node.query)
     *       titleNode: "span.yui-title",
     *       // Set NodeList references using selector syntax
     *       // (array indicates selector is to be run through node.queryAll)
     *       listNodes: ["li.yui-item"],
     *       // Set other attribute types, using a parse function.
     *       // Context is set to the widget instance.
     *       label: function(contentBox) {
     *           return contentBox.query("span.title").get("innerHTML");
     *       }
     *   }
     * </pre>
     *
     * @property Widget.HTML_PARSER
     * @type Object
     * @static
     */
    Widget.HTML_PARSER = {};

    Y.extend(Widget, Y.Base, {

    	/**
    	 * Returns a class name prefixed with the the value of the
    	 * <code>YUI.config.classNamePrefix</code> attribute + the instances <code>NAME</code> property.
    	 * Uses <code>YUI.config.classNameDelimiter</code> attribute to delimit the provided strings.
    	 * e.g.
    	 * <code>
    	 * <pre>
    	 *    // returns "yui-slider-foo-bar", for a slider instance
    	 *    var scn = slider.getClassName('foo','bar');
    	 *
    	 *    // returns "yui-overlay-foo-bar", for an overlay instance
    	 *    var ocn = slider.getClassName('foo','bar');
    	 * </pre>
    	 * </code>
    	 *
    	 * @method getClassName
    	 * @param {String}+ One or more classname bits to be joined and prefixed
    	 */
    	getClassName: function () {
    		var args = Y.Array(arguments, 0, true);
    		args.splice(0, 0, this._name);
    		return ClassNameManager.getClassName.apply(ClassNameManager, args);
    	},

        /**
         * Initializer lifecycle implementation for the Widget class. Registers the
         * widget instance, and runs through the Widget's HTML_PARSER definition.
         *
         * @method initializer
         * @protected
         * @param  config {Object} Configuration object literal for the widget
         */
        initializer: function(config) {
            Y.log('initializer called', 'life', 'widget');

            /**
             * Notification event, which widget implementations can fire, when
             * they change the content of the widget. This event has no default
             * behavior and cannot be prevented, so the "on" or "after"
             * moments are effectively equivalent (with on listeners being invoked before
             * after listeners).
             *
             * @event widget:contentUpdate
             * @preventable false
             * @param {EventFacade} e The Event Facade
             */
            this.publish(ContentUpdate, { preventable:false });

    		this._name = this.constructor.NAME.toLowerCase();

            var nodeId = this.get(BOUNDING_BOX).get(ID);
            if (nodeId) {
                _instances[nodeId] = this;
            }

            var htmlConfig = this._parseHTML(this.get(CONTENT_BOX));
            if (htmlConfig) {
                Y.aggregate(config, htmlConfig, false);
            }
        },

        /**
         * Descructor lifecycle implementation for the Widget class. Purges events attached
         * to the bounding box (and all child nodes) and removes the Widget from the
         * list of registered widgets.
         *
         * @method destructor
         * @protected
         */
        destructor: function() {
            Y.log('destructor called', 'life', 'widget');

            var boundingBox = this.get(BOUNDING_BOX);

            Y.Event.purgeElement(boundingBox, true);

            var nodeId = boundingBox.get(ID);
            if (nodeId && nodeId in _instances) {
                delete _instances[nodeId];
            }
        },

        /**
         * Establishes the initial DOM for the widget. Invoking this
         * method will lead to the creating of all DOM elements for
         * the widget (or the manipulation of existing DOM elements
         * for the progressive enhancement use case).
         * <p>
         * This method should only be invoked once for an initialized
         * widget.
         * </p>
         * <p>
         * It delegates to the widget specific renderer method to do
         * the actual work.
         * </p>
         *
         * @method render
         * @chainable
         * @final
         * @param  parentNode {Object | String} Optional. The Node under which the
         * Widget is to be rendered. This can be a Node instance or a CSS selector string.
         * <p>
         * If the selector string returns more than one Node, the first node will be used
         * as the parentNode. NOTE: This argument is required if both the boundingBox and contentBox
         * are not currently in the document. If it's not provided, the Widget will be rendered
         * to the body of the current document in this case.
         * </p>
         */
        render: function(parentNode) {

            if (this.get(DESTROYED)) {
                Y.log("Render failed; widget has been destroyed", "error", "widget");
                return;
            }

            if (!this.get(RENDERED)) {
                 /**
                 * Lifcyle event for the render phase, fired prior to rendering the UI
                 * for the widget (prior to invoking the widgets renderer method).
                 * <p>
                 * Subscribers to the "on" moment of this event, will be notified
                 * before the widget is rendered.
                 * </p>
                 * <p>
                 * Subscribers to the "after" momemt of this event, will be notified
                 * after rendering is complete.
                 * </p>
                 *
                 * @event widget:render
                 * @preventable _defRenderFn
                 * @param {EventFacade} e The Event Facade
                 */
                this.publish(RENDER, {queuable:false, defaultFn: this._defRenderFn});

                parentNode = (parentNode) ? Node.get(parentNode) : null;
                if (parentNode && !parentNode.inDoc()) {
                    parentNode = null;
                }

                this.fire(RENDER, {parentNode: parentNode});
            }

            return this;
        },

        /**
         * Default render handler
         *
         * @method _defRenderFn
         * @protected
         * @param {EventFacade} e The Event object
         * @param {Node} parentNode The parent node to render to, if passed in to the <code>render</code> method
         */
        _defRenderFn : function(e) {

                this._renderUI(e.parentNode);
                this._bindUI();
                this._syncUI();

                this.renderer();

                this._set(RENDERED, true);
        },

        /**
         * Creates DOM (or manipulates DOM for progressive enhancement)
         * This method is invoked by render() and is not chained
         * automatically for the class hierarchy (like initializer, destructor)
         * so it should be chained manually for subclasses if required.
         *
         * @method renderer
         * @protected
         */
        renderer: function() {
            this.renderUI();
            this.bindUI();
            this.syncUI();
        },

        /**
         * Configures/Sets up listeners to bind Widget State to UI/DOM
         *
         * This method is not called by framework and is not chained
         * automatically for the class hierarchy.
         *
         * @method bindUI
         * @protected
         */
        bindUI: function() {},

        /**
         * Adds nodes to the DOM
         *
         * This method is not called by framework and is not chained
         * automatically for the class hierarchy.
         *
         * @method renderUI
         * @protected
         */
        renderUI: function() {},

        /**
         * Refreshes the rendered UI, based on Widget State
         *
         * This method is not called by framework and is not chained
         * automatically for the class hierarchy.
         *
         * @method syncUI
         *
         */
        syncUI: function(){},

        /**
        * @method hide
        * @description Shows the Module element by setting the "visible" attribute to "false".
        */
        hide: function() {
            return this.set(VISIBLE, false);
        },

        /**
        * @method show
        * @description Shows the Module element by setting the "visible" attribute to "true".
        */
        show: function() {
            return this.set(VISIBLE, true);
        },

        /**
        * @method focus
        * @description Causes the Widget to receive the focus by setting the "focused"
        * attribute to "true".
        */
        focus: function () {
            return this._set(FOCUSED, true);
        },

        /**
        * @method blur
        * @description Causes the Widget to lose focus by setting the "focused" attribute
        * to "false"
        */
        blur: function () {
            return this._set(FOCUSED, false);
        },

        /**
        * @method enable
        * @description Set the Widget's "disabled" attribute to "false".
        */
        enable: function() {
            return this.set(DISABLED, false);
        },

        /**
        * @method disabled
        * @description Set the Widget's "disabled" attribute to "true".
        */
        disable: function() {
            return this.set(DISABLED, true);
        },

        /**
         * Utilitity method used to apply the <code>HTML_PARSER</code> configuration for the
         * instance, to retrieve config data values.
         *
         * @method _parseHTML
         * @private
         * @param  node {Node} Root node to use to parse markup for configuration data
         * @return config {Object} configuration object, with values found in the HTML, populated
         */
        _parseHTML : function(node) {

            var schema = this._getHtmlParser(),
                data,
                val;

            if (schema && node && node.hasChildNodes()) {

                O.each(schema, function(v, k, o) {
                    val = null;

                    if (L.isFunction(v)) {
                        val = v.call(this, node);
                    } else {
                        if (L.isArray(v)) {
                            val = node.queryAll(v[0]);
                        } else {
                            val = node.query(v);
                        }
                    }

                    if (val !== null && val !== undefined) {
                        data = data || {};
                        data[k] = val;
                    }

                }, this);
            }

            return data;
        },

        /**
         * Moves a pre-defined set of style rules (WRAP_STYLES) from one node to another.
         *
         * @method _moveStyles
         * @private
         * @param {Node} nodeFrom The node to gather the styles from
         * @param {Node} nodeTo The node to apply the styles to
         */
        _moveStyles: function(nodeFrom, nodeTo) {

            var styles = this.WRAP_STYLES,
                pos = nodeFrom.getStyle('position'),
                contentBox = this.get(CONTENT_BOX),
                xy = [0,0],
                h, w;

            if (!this.get('height')) {
                h = contentBox.get('offsetHeight');
            }

            if (!this.get('width')) {
                w = contentBox.get('offsetWidth');
            }

            if (pos === 'absolute') {
                xy = nodeFrom.getXY();
                nodeTo.setStyles({
                    right: 'auto',
                    bottom: 'auto'
                });

                nodeFrom.setStyles({
                    right: 'auto',
                    bottom: 'auto'
                });
            }

            Y.each(styles, function(v, k) {
                var s = nodeFrom.getStyle(k);
                nodeTo.setStyle(k, s);
                if (v === false) {
                    nodeFrom.setStyle(k, '');
                } else {
                    nodeFrom.setStyle(k, v);
                }
            });

            if (pos === 'absolute') {
                nodeTo.setXY(xy);
            }

            if (h) {
                this.set('height', h);
            }

            if (w) {
                this.set('width', w);
            }
        },

        /**
        * Helper method to collect the boundingBox and contentBox, set styles and append to the provided parentNode, if not
        * already a child. The owner document of the boundingBox, or the owner document of the contentBox will be used
        * as the document into which the Widget is rendered if a parentNode is node is not provided. If both the boundingBox and
        * the contentBox are not currently in the document, and no parentNode is provided, the widget will be rendered
        * to the current document's body.
        *
        * @method _renderBox
        * @private
        * @param {Node} parentNode The parentNode to render the widget to. If not provided, and both the boundingBox and
        * the contentBox are not currently in the document, the widget will be rendered to the current document's body.
        */
        _renderBox: function(parentNode) {

            var contentBox = this.get(CONTENT_BOX),
                boundingBox = this.get(BOUNDING_BOX),
                doc = boundingBox.get(OWNER_DOCUMENT) || contentBox.get(OWNER_DOCUMENT),
                body;

            if (!boundingBox.compareTo(contentBox.get(PARENT_NODE))) {
                if (this.get('moveStyles')) {
                    this._moveStyles(contentBox, boundingBox);
                }
                // If contentBox box is already in the document, have boundingBox box take it's place
                if (contentBox.inDoc(doc)) {
                    contentBox.get(PARENT_NODE).replaceChild(boundingBox, contentBox);
                }
                boundingBox.appendChild(contentBox);
            }

            if (!boundingBox.inDoc(doc) && !parentNode) {
                body = Node.get(BODY);
                if (body.get(FIRST_CHILD)) {
                    // Special case when handling body as default (no parentNode), always try to insert.
                    body.insertBefore(boundingBox, body.get(FIRST_CHILD));
                } else {
                    body.appendChild(boundingBox);
                }
            } else {
                if (parentNode && !parentNode.compareTo(boundingBox.get(PARENT_NODE))) {
                    parentNode.appendChild(boundingBox);
                }
            }
        },

        /**
        * Setter for the boundingBox attribute
        *
        * @method _setBoundingBox
        * @private
        * @param Node/String
        * @return Node
        */
        _setBoundingBox: function(node) {
            return this._setBox(node, this.BOUNDING_TEMPLATE);
        },

        /**
        * Setter for the contentBox attribute
        *
        * @method _setContentBox
        * @private
        * @param {Node|String} node
        * @return Node
        */
        _setContentBox: function(node) {
            return this._setBox(node, this.CONTENT_TEMPLATE);
        },

        /**
         * Helper method to set the bounding/content box, or create it from
         * the provided template if not found.
         *
         * @method _setBox
         * @private
         *
         * @param {Node|String} node The node reference
         * @param {String} template HTML string template for the node
         * @return {Node} The node
         */
        _setBox : function(node, template) {
            node = Node.get(node) || Node.create(template);

            var sid = Y.stamp(node);
            if (!node.get(ID)) {
                node.set(ID, sid);
            }
            return node;
        },

        /**
         * Initializes the UI state for the Widget's bounding/content boxes.
         *
         * @method _renderUI
         * @protected
         * @param {Node} The parent node to rendering the widget into
         */
        _renderUI: function(parentNode) {
            this._renderBoxClassNames();
            this._renderBox(parentNode);
        },

         /**
          * Applies standard class names to the boundingBox and contentBox
          *
          * @method _renderBoxClassNames
          * @protected
          */
        _renderBoxClassNames : function() {
            var classes = this._getClasses(),
                boundingBox = this.get(BOUNDING_BOX),
                contentBox = this.get(CONTENT_BOX),
                name, i;

            boundingBox.addClass(Widget.getClassName());

            // Start from Widget Sub Class
            for (i = classes.length-3; i >= 0; i--) {
                name = classes[i].NAME;
                if (name) {
                    boundingBox.addClass(ClassNameManager.getClassName(name.toLowerCase()));
                }
            }

            // Use instance based name for content box
            contentBox.addClass(this.getClassName(CONTENT));
        },

        /**
         * Sets up DOM and CustomEvent listeners for the widget.
         *
         * @method _bindUI
         * @protected
         */
        _bindUI: function() {
            this.after('visibleChange', this._afterVisibleChange);
            this.after('disabledChange', this._afterDisabledChange);
            this.after('heightChange', this._afterHeightChange);
            this.after('widthChange', this._afterWidthChange);
            this.after('focusedChange', this._afterFocusedChange);

            this._bindDOMListeners();
        },

        /**
         * Sets up DOM listeners, on elements rendered by the widget.
         *
         * @method _bindDOMListeners
         * @protected
         */
        _bindDOMListeners : function() {

    		var oDocument = this.get(BOUNDING_BOX).get("ownerDocument");

    		oDocument.on("focus", this._onFocus, this);

    		//	Fix for Webkit:
    		//	Document doesn't receive focus in Webkit when the user mouses
    		//	down on it, so the "focused" attribute won't get set to the
    		//	correct value.

    		if (Y.UA.webkit) {
    			oDocument.on("mousedown", this._onDocMouseDown, this);
    		}

        },

        /**
         * Updates the widget UI to reflect the attribute state.
         *
         * @method _syncUI
         * @protected
         */
        _syncUI: function() {
            this._uiSetVisible(this.get(VISIBLE));
            this._uiSetDisabled(this.get(DISABLED));
            this._uiSetHeight(this.get(HEIGHT));
            this._uiSetWidth(this.get(WIDTH));
            this._uiSetFocused(this.get(FOCUSED));
    		this._uiSetTabIndex(this.get(TAB_INDEX));
        },

        /**
         * Sets the height on the widget's bounding box element
         *
         * @method _uiSetHeight
         * @protected
         * @param {String | Number} val
         */
        _uiSetHeight: function(val) {
            if (L.isNumber(val)) {
                val = val + this.DEF_UNIT;
            }
            this.get(BOUNDING_BOX).setStyle(HEIGHT, val);
        },

        /**
         * Sets the width on the widget's bounding box element
         *
         * @method _uiSetWidth
         * @protected
         * @param {String | Number} val
         */
        _uiSetWidth: function(val) {
            if (L.isNumber(val)) {
                val = val + this.DEF_UNIT;
            }
            this.get(BOUNDING_BOX).setStyle(WIDTH, val);
        },

        /**
         * Sets the visible state for the UI
         *
         * @method _uiSetVisible
         * @protected
         * @param {boolean} val
         */
        _uiSetVisible: function(val) {

            var box = this.get(BOUNDING_BOX),
                sClassName = this.getClassName(HIDDEN);

            if (val === true) {
                box.removeClass(sClassName);
            } else {
                box.addClass(sClassName);
            }
        },

        /**
         * Sets the disabled state for the UI
         *
         * @protected
         * @param {boolean} val
         */
        _uiSetDisabled: function(val) {

            var box = this.get(BOUNDING_BOX),
                sClassName = this.getClassName(DISABLED);

            if (val === true) {
                box.addClass(sClassName);
            } else {
                box.removeClass(sClassName);
            }
        },

        /**
        * Set the tabIndex on the widget's rendered UI
        *
        * @method _uiSetTabIndex
        * @protected
        * @param Number
        */
        _uiSetTabIndex: function(index) {

    		var boundingBox = this.get(BOUNDING_BOX);

    		if (L.isNumber(index)) {
    			boundingBox.set(TAB_INDEX, index);
    		}
    		else {
    			boundingBox.removeAttribute(TAB_INDEX);
    		}

        },

        /**
         * Sets the focused state for the UI
         *
         * @protected
         * @param {boolean} val
         * @param {string} src String representing the source that triggered an update to
         * the UI.
         */
        _uiSetFocused: function(val, src) {

            var box = this.get(BOUNDING_BOX),
                sClassName = this.getClassName(FOCUSED);

            if (val === true) {
                box.addClass(sClassName);
                if (src !== UI) {
                    box.focus();
                }
            } else {
                box.removeClass(sClassName);
                if (src !== UI) {
                    box.blur();
                }
            }
        },

        /**
         * Default visible attribute state change handler
         *
         * @method _afterVisibleChange
         * @protected
         * @param {EventFacade} evt The event facade for the attribute change
         */
        _afterVisibleChange: function(evt) {
            this._uiSetVisible(evt.newVal);
        },

        /**
         * Default disabled attribute state change handler
         *
         * @method _afterDisabledChange
         * @protected
         * @param {EventFacade} evt The event facade for the attribute change
         */
        _afterDisabledChange: function(evt) {
            this._uiSetDisabled(evt.newVal);
        },

        /**
         * Default height attribute state change handler
         *
         * @method _afterHeightChange
         * @protected
         * @param {EventFacade} evt The event facade for the attribute change
         */
        _afterHeightChange: function(evt) {
            this._uiSetHeight(evt.newVal);
        },

        /**
         * Default widget attribute state change handler
         *
         * @method _afterWidthChange
         * @protected
         * @param {EventFacade} evt The event facade for the attribute change
         */
        _afterWidthChange: function(evt) {
            this._uiSetWidth(evt.newVal);
        },

        /**
         * Default focused attribute state change handler
         *
         * @method _afterFocusedChange
         * @protected
         * @param {EventFacade} evt The event facade for the attribute change
         */
        _afterFocusedChange: function(evt) {
            this._uiSetFocused(evt.newVal, evt.src);
        },

    	/**
    	* @method _onDocMouseDown
    	* @description "mousedown" event handler for the owner document of the
    	* widget's bounding box.
    	* @protected
        * @param {EventFacade} evt The event facade for the DOM focus event
    	*/
    	_onDocMouseDown: function (evt) {

    		if (this._hasDOMFocus) {
     			this._onFocus(evt);
    		}

    	},

        /**
         * DOM focus event handler, used to sync the state of the Widget with the DOM
         *
         * @method _onFocus
         * @protected
         * @param {EventFacade} evt The event facade for the DOM focus event
         */
        _onFocus: function (evt) {

    		var target = evt.target,
    			boundingBox = this.get(BOUNDING_BOX),
    			bFocused = (boundingBox.compareTo(target) || boundingBox.contains(target));

    		this._hasDOMFocus = bFocused;
            this._set(FOCUSED, bFocused, { src: UI });

        },

        /**
         * Generic toString implementation for all widgets.
         *
         * @method toString
         * @return {String} The default string value for the widget [ displays the NAME of the instance, and the unique id ]
         */
        toString: function() {
            return this.constructor.NAME + "[" + this._yuid + "]";
        },

        /**
         * Default unit to use for dimension values
         *
         * @property DEF_UNIT
         */
        DEF_UNIT : "px",

        /**
         * Static property defining the markup template for content box.
         *
         * @property CONTENT_TEMPLATE
         * @type String
         */
        CONTENT_TEMPLATE : "<div></div>",

        /**
         * Static property defining the markup template for bounding box.
         *
         * @property BOUNDING_TEMPLATE
         * @type String
         */
        BOUNDING_TEMPLATE : "<div></div>",

        /**
         * Static property listing the styles that are mimiced on the bounding box from the content box.
         *
         * @property WRAP_STYLES
         * @type Object
         */
        WRAP_STYLES : {
            height: '100%',
            width: '100%',
            zIndex: false,
            position: 'static',
            top: '0',
            left: '0',
            bottom: '',
            right: '',
            padding: '',
            margin: ''
        },

        /**
         * Sets strings for a particular locale, merging with any existing
         * strings which may already be defined for the locale.
         *
         * @method _setStrings
         * @protected
         * @param {Object} strings The hash of string key/values to set
         * @param {Object} locale The locale for the string values being set
         */
        _setStrings : function(strings, locale) {
            var strs = this._strings;
            locale = locale.toLowerCase();

            if (!strs[locale]) {
                strs[locale] = {};
            }

            Y.aggregate(strs[locale], strings, true);
            return strs[locale];
        },

        /**
         * Returns the strings key/value hash for a paricular locale, without locale lookup applied.
         *
         * @method _getStrings
         * @protected
         * @param {Object} locale
         */
        _getStrings : function(locale) {
            return this._strings[locale.toLowerCase()];
        },

        /**
         * Gets the entire strings hash for a particular locale, performing locale lookup.
         * <p>
         * If no values of the key are defined for a particular locale the value for the
         * default locale (in initial locale set for the class) is returned.
         * </p>
         * @method getStrings
         * @param {String} locale (optional) The locale for which the string value is required. Defaults to the current locale, if not provided.
         */
        // TODO: Optimize/Cache. Clear cache on _setStrings call.
        getStrings : function(locale) {

            locale = (locale || this.get(LOCALE)).toLowerCase();

            Y.log("getStrings: For " + locale, "info", "widget");

            var defLocale = this.getDefaultLocale().toLowerCase(),
                defStrs = this._getStrings(defLocale),
                strs = (defStrs) ? Y.merge(defStrs) : {},
                localeSegments = locale.split(HYPHEN);

            // If locale is different than the default, or needs lookup support
            if (locale !== defLocale || localeSegments.length > 1) {
                var lookup = "";
                for (var i = 0, l = localeSegments.length; i < l; ++i) {
                    lookup += localeSegments[i];

                    Y.log("getStrings: Merging in strings from: " + lookup, "info", "widget");

                    var localeStrs = this._getStrings(lookup);
                    if (localeStrs) {
                        Y.aggregate(strs, localeStrs, true);
                    }
                    lookup += HYPHEN;
                }
            }

            return strs;
        },

        /**
         * Gets the string for a particular key, for a particular locale, performing locale lookup.
         * <p>
         * If no values if defined for the key, for the given locale, the value for the
         * default locale (in initial locale set for the class) is returned.
         * </p>
         * @method getString
         * @param {String} key The key.
         * @param {String} locale (optional) The locale for which the string value is required. Defaults to the current locale, if not provided.
         */
        getString : function(key, locale) {

            locale = (locale || this.get(LOCALE)).toLowerCase();

            Y.log("getString: For " + locale, "info", "widget");

            var defLocale = (this.getDefaultLocale()).toLowerCase(),
                strs = this._getStrings(defLocale) || {},
                str = strs[key],
                idx = locale.lastIndexOf(HYPHEN);

            // If locale is different than the default, or needs lookup support
            if (locale !== defLocale || idx != -1) {
                do {
                    Y.log("getString: Performing lookup for: " + locale, "info", "widget");

                    strs = this._getStrings(locale);
                    if (strs && key in strs) {
                        str = strs[key];
                        break;
                    }
                    idx = locale.lastIndexOf(HYPHEN);
                    // Chop of last locale segment
                    if (idx != -1) {
                        locale = locale.substring(0, idx);
                    }

                } while (idx != -1);
            }

            return str;
        },

        /**
         * Returns the default locale for the widget (the locale value defined by the
         * widget class, or provided by the user during construction).
         *
         * @method getDefaultLocale
         * @return {String} The default locale for the widget
         */
        getDefaultLocale : function() {
            return this._conf.get(LOCALE, INIT_VALUE);
        },

        /**
         * Private stings hash, used to store strings in locale specific buckets.
         *
         * @property _strings
         * @private
         * @type Object
         */
        _strings: null,

        /**
         * Gets the HTML_PARSER definition for this instance, by merging HTML_PARSER
         * definitions across the class hierarchy.
         *
         * @method _getHtmlParser
         * @return {Object} HTML_PARSER definition for this instance
         */
        _getHtmlParser : function() {
            if (!this._HTML_PARSER) {
                var classes = this._getClasses(),
                    parser = {},
                    i, p;

                for (i = classes.length - 1; i >= 0; i--) {
                    p = classes[i].HTML_PARSER;
                    if (p) {
                        Y.mix(parser, p, true);
                    }
                }

                this._HTML_PARSER = parser;
            }

            return this._HTML_PARSER;
        }
    });

    Y.Widget = Widget;

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