DropDownMenu.js

define([
	"dojo/_base/declare", // declare
	"dojo/keys", // keys
	"dojo/text!./templates/Menu.html",
	"./_OnDijitClickMixin",
	"./_MenuBase"
], function(declare, keys, template, _OnDijitClickMixin, _MenuBase){

	// module:
	//		dijit/DropDownMenu

	return declare("dijit.DropDownMenu", [_MenuBase, _OnDijitClickMixin], {
		// summary:
		//		A menu, without features for context menu (Meaning, drop down menu)

		templateString: template,

		baseClass: "dijitMenu",

		postCreate: function(){
			this.inherited(arguments);
			var l = this.isLeftToRight();
			this._openSubMenuKey = l ? keys.RIGHT_ARROW : keys.LEFT_ARROW;
			this._closeSubMenuKey = l ? keys.LEFT_ARROW : keys.RIGHT_ARROW;
			this.connectKeyNavHandlers([keys.UP_ARROW], [keys.DOWN_ARROW]);
		},

		_onKeyDown: function(/*Event*/ evt){
			// summary:
			//		Handle keyboard based menu navigation.
			// tags:
			//		protected

			if(evt.ctrlKey || evt.altKey){
				return;
			}

			switch(evt.keyCode){
				case this._openSubMenuKey:
					this._moveToPopup(evt);
					evt.stopPropagation();
					evt.preventDefault();
					break;
				case this._closeSubMenuKey:
					if(this.parentMenu){
						if(this.parentMenu._isMenuBar){
							this.parentMenu.focusPrev();
						}else{
							this.onCancel(false);
						}
					}else{
						evt.stopPropagation();
						evt.preventDefault();
					}
					break;
			}
		}
	});
});