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YUI.add('widget-child', function (Y, NAME) {

/**
 * Extension enabling a Widget to be a child of another Widget.
 *
 * @module widget-child
 */

var Lang = Y.Lang;

/**
 * Widget extension providing functionality enabling a Widget to be a
 * child of another Widget.
 *
 * @class WidgetChild
 * @param {Object} config User configuration object.
*/
function Child() {

//  Widget method overlap
    Y.after(this._syncUIChild, this, "syncUI");
    Y.after(this._bindUIChild, this, "bindUI");

}

Child.ATTRS = {

/**
 * @attribute selected
 * @type Number
 * @default 0
 *
 * @description Number indicating if the Widget is selected. Possible
 * values are:
 * <dl>
 * <dt>0</dt> <dd>(Default) Not selected</dd>
 * <dt>1</dt> <dd>Fully selected</dd>
 * <dt>2</dt> <dd>Partially selected</dd>
 * </dl>
 */
 selected: {
 value: 0,
 validator: Lang.isNumber
 },

/**
     * @attribute index
     * @type Number
     * @readOnly
     *
     * @description Number representing the Widget's ordinal position in its
     * parent Widget.
     */
    index: {
        readOnly: true,
        getter: function () {

var parent = this.get("parent"),
                index = -1;

if (parent) {
                index = parent.indexOf(this);
            }

return index;

}
    },

/**
     * @attribute parent
     * @type Widget
     * @readOnly
     *
     * @description Retrieves the parent of the Widget in the object hierarchy.
    */
    parent: {
        readOnly: true
    },

/**
     * @attribute depth
     * @type Number
     * @default -1
     * @readOnly
     *
     * @description Number representing the depth of this Widget relative to
     * the root Widget in the object heirarchy.
     */
    depth: {
        readOnly: true,
        getter: function () {

var parent = this.get("parent"),
                root = this.get("root"),
                depth = -1;

while (parent) {

depth = (depth + 1);

if (parent == root) {
                    break;
                }

parent = parent.get("parent");

}

return depth;

}
    },

/**
     * @attribute root
     * @type Widget
     * @readOnly
     *
     * @description Returns the root Widget in the object hierarchy.  If the
     * ROOT_TYPE property is set, the search for the root Widget will be
     * constrained to parent Widgets of the specified type.
     */
    root: {
        readOnly: true,
        getter: function () {

var getParent = function (child) {

var parent = child.get("parent"),
                    FnRootType = child.ROOT_TYPE,
                    criteria = parent;

if (FnRootType) {
                    criteria = (parent && Y.instanceOf(parent, FnRootType));
                }

return (criteria ? getParent(parent) : child);

};

return getParent(this);

}
    }

};

Child.prototype = {

/**
 * Constructor reference used to determine the root of a Widget-based
 * object tree.
 * 
 * Currently used to control the behavior of the <code>root</code>
 * attribute so that recursing up the object heirarchy can be constrained
 * to a specific type of Widget. Widget authors should set this property
 * to the constructor function for a given Widget implementation.
 * 
 *
 * @property ROOT_TYPE
 * @type Object
 */
 ROOT_TYPE: null,

/**
     * Returns the node on which to bind delegate listeners.
     *
     * Override of Widget's implementation of _getUIEventNode() to ensure that
     * all event listeners are bound to the Widget's topmost DOM element.
     * This ensures that the firing of each type of Widget UI event (click,
     * mousedown, etc.) is facilitated by a single, top-level, delegated DOM
     * event listener.
     *
     * @method _getUIEventNode
     * @for Widget
     * @protected
     */
    _getUIEventNode: function () {
        var root = this.get("root"),
            returnVal;

if (root) {
            returnVal = root.get("boundingBox");
        }

return returnVal;
    },

/**
    * @method next
    * @description Returns the Widget's next sibling.
    * @param {Boolean} circular Boolean indicating if the parent's first child
    * should be returned if the child has no next sibling.
    * @return {Widget} Widget instance.
    */
    next: function (circular) {

var parent = this.get("parent"),
            sibling;

if (parent) {
            sibling = parent.item((this.get("index")+1));
        }

if (!sibling && circular) {
            sibling = parent.item(0);
        }

return sibling;

/**
    * @method previous
    * @description Returns the Widget's previous sibling.
    * @param {Boolean} circular Boolean indicating if the parent's last child
    * should be returned if the child has no previous sibling.
    * @return {Widget} Widget instance.
    */
    previous: function (circular) {

var parent = this.get("parent"),
            index = this.get("index"),
            sibling;

if (parent && index > 0) {
            sibling = parent.item([(index-1)]);
        }

if (!sibling && circular) {
            sibling = parent.item((parent.size() - 1));
        }

return sibling;

//  Override of Y.WidgetParent.remove()
    //  Sugar implementation allowing a child to remove itself from its parent.
    remove: function (index) {

var parent,
            removed;

if (Lang.isNumber(index)) {
            removed = Y.WidgetParent.prototype.remove.apply(this, arguments);
        }
        else {

parent = this.get("parent");

if (parent) {
                removed = parent.remove(this.get("index"));
            }

}

return removed;

/**
    * @method isRoot
    * @description Determines if the Widget is the root Widget in the
    * object hierarchy.
    * @return {Boolean} Boolean indicating if Widget is the root Widget in the
    * object hierarchy.
    */
    isRoot: function () {
        return (this == this.get("root"));
    },

/**
    * @method ancestor
    * @description Returns the Widget instance at the specified depth.
    * @param {number} depth Number representing the depth of the ancestor.
    * @return {Widget} Widget instance.
    */
    ancestor: function (depth) {

var root = this.get("root"),
            parent;

if (this.get("depth") > depth)  {

parent = this.get("parent");

while (parent != root && parent.get("depth") > depth) {
                parent = parent.get("parent");
            }

}

return parent;

/**
 * Updates the UI to reflect the <code>selected</code> attribute value.
 *
 * @method _uiSetChildSelected
 * @protected
 * @param {number} selected The selected value to be reflected in the UI.
 */
 _uiSetChildSelected: function (selected) {

var box = this.get("boundingBox"),
            sClassName = this.getClassName("selected");

if (selected === 0) {
            box.removeClass(sClassName);
        }
        else {
            box.addClass(sClassName);
        }

/**
 * Default attribute change listener for the <code>selected</code>
 * attribute, responsible for updating the UI, in response to
 * attribute changes.
 *
 * @method _afterChildSelectedChange
 * @protected
 * @param {EventFacade} event The event facade for the attribute change.
 */
 _afterChildSelectedChange: function (event) {
 this._uiSetChildSelected(event.newVal);
 },

/**
 * Synchronizes the UI to match the WidgetChild state.
 * 
 * This method is invoked after bindUI is invoked for the Widget class
 * using YUI's aop infrastructure.
 * 
 *
 * @method _syncUIChild
 * @protected
 */
 _syncUIChild: function () {
 this._uiSetChildSelected(this.get("selected"));
 },

/**
 * Binds event listeners responsible for updating the UI state in response
 * to WidgetChild related state changes.
 * 
 * This method is invoked after bindUI is invoked for the Widget class
 * using YUI's aop infrastructure.
 * 
 * @method _bindUIChild
 * @protected
 */
 _bindUIChild: function () {
 this.after("selectedChange", this._afterChildSelectedChange);
 }

};

Y.WidgetChild = Child;

}, '3.18.1', {"requires": ["base-build", "widget"]});

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