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 /**
 @module tree
 @submodule tree-selectable
 **/
 
 /**
 `Tree.Node` extension that adds methods useful for nodes in trees that use the
 `Tree.Selectable` extension.
 
 @class Tree.Node.Selectable
 @constructor
 @extensionfor Tree.Node
 **/
 
 function NodeSelectable() {}
 
 NodeSelectable.prototype = {
 /**
 Returns `true` if this node is currently selected.
 
 @method isSelected
 @return {Boolean} `true` if this node is currently selected, `false`
 otherwise.
 **/
 isSelected: function () {
 return !!this.state.selected;
 },
 
 /**
 Selects this node.
 
 @method select
 @param {Object} [options] Options.
 @param {Boolean} [options.silent=false] If `true`, the `select` event
 will be suppressed.
 @param {String} [options.src] Source of the change, to be passed along
 to the event facade of the resulting event. This can be used to
 distinguish between changes triggered by a user and changes
 triggered programmatically, for example.
 @chainable
 **/
 select: function (options) {
 this.tree.selectNode(this, options);
 return this;
 },
 
 /**
 Unselects this node.
 
 @method unselect
 @param {Object} [options] Options.
 @param {Boolean} [options.silent=false] If `true`, the `unselect` event
 will be suppressed.
 @param {String} [options.src] Source of the change, to be passed along
 to the event facade of the resulting event. This can be used to
 distinguish between changes triggered by a user and changes
 triggered programmatically, for example.
 @chainable
 **/
 unselect: function (options) {
 this.tree.unselectNode(this, options);
 return this;
 }
 };
 
 Y.Tree.Node.Selectable = NodeSelectable;