dojo_app/js/library/dijit/_FocusMixin.js

define([
	"./focus",
	"./_WidgetBase",
	"dojo/_base/declare", // declare
	"dojo/_base/lang" // lang.extend
], function(focus, _WidgetBase, declare, lang){

	// module:
	//		dijit/_FocusMixin

	// We don't know where _FocusMixin will occur in the inheritance chain, but we need the _onFocus()/_onBlur() below
	// to be last in the inheritance chain, so mixin to _WidgetBase.
	lang.extend(_WidgetBase, {
		// focused: [readonly] Boolean
		//		This widget or a widget it contains has focus, or is "active" because
		//		it was recently clicked.
		focused: false,

		onFocus: function(){
			// summary:
			//		Called when the widget becomes "active" because
			//		it or a widget inside of it either has focus, or has recently
			//		been clicked.
			// tags:
			//		callback
		},

		onBlur: function(){
			// summary:
			//		Called when the widget stops being "active" because
			//		focus moved to something outside of it, or the user
			//		clicked somewhere outside of it, or the widget was
			//		hidden.
			// tags:
			//		callback
		},

		_onFocus: function(){
			// summary:
			//		This is where widgets do processing for when they are active,
			//		such as changing CSS classes.  See onFocus() for more details.
			// tags:
			//		protected
			this.onFocus();
		},

		_onBlur: function(){
			// summary:
			//		This is where widgets do processing for when they stop being active,
			//		such as changing CSS classes.  See onBlur() for more details.
			// tags:
			//		protected
			this.onBlur();
		}
	});

	return declare("dijit._FocusMixin", null, {
		// summary:
		//		Mixin to widget to provide _onFocus() and _onBlur() methods that
		//		fire when a widget or its descendants get/lose focus

		// flag that I want _onFocus()/_onBlur() notifications from focus manager
		_focusManager: focus
	});

});