define("dijit/_KeyNavContainer", [
	"dojo/_base/kernel", // kernel.deprecated
	"./_Container",
	"./_FocusMixin",
	"dojo/_base/array", // array.forEach
	"dojo/keys", // keys.END keys.HOME
	"dojo/_base/declare", // declare
	"dojo/_base/event", // event.stop
	"dojo/dom-attr", // domAttr.set
	"dojo/_base/lang" // lang.hitch
], function(kernel, _Container, _FocusMixin, array, keys, declare, event, domAttr, lang){


	// module:
	//		dijit/_KeyNavContainer

	return declare("dijit._KeyNavContainer", [_FocusMixin, _Container], {
		// summary:
		//		A _Container with keyboard navigation of its children.
		// description:
		//		To use this mixin, call connectKeyNavHandlers() in
		//		postCreate().
		//		It provides normalized keyboard and focusing code for Container
		//		widgets.

/*=====
		// focusedChild: [protected] Widget
		//		The currently focused child widget, or null if there isn't one
		focusedChild: null,
=====*/

		// tabIndex: String
		//		Tab index of the container; same as HTML tabIndex attribute.
		//		Note then when user tabs into the container, focus is immediately
		//		moved to the first item in the container.
		tabIndex: "0",

		connectKeyNavHandlers: function(/*keys[]*/ prevKeyCodes, /*keys[]*/ nextKeyCodes){
			// summary:
			//		Call in postCreate() to attach the keyboard handlers
			//		to the container.
			// preKeyCodes: keys[]
			//		Key codes for navigating to the previous child.
			// nextKeyCodes: keys[]
			//		Key codes for navigating to the next child.
			// tags:
			//		protected

			// TODO: call this automatically from my own postCreate()

			var keyCodes = (this._keyNavCodes = {});
			var prev = lang.hitch(this, "focusPrev");
			var next = lang.hitch(this, "focusNext");
			array.forEach(prevKeyCodes, function(code){ keyCodes[code] = prev; });
			array.forEach(nextKeyCodes, function(code){ keyCodes[code] = next; });
			keyCodes[keys.HOME] = lang.hitch(this, "focusFirstChild");
			keyCodes[keys.END] = lang.hitch(this, "focusLastChild");
			this.connect(this.domNode, "onkeypress", "_onContainerKeypress");
			this.connect(this.domNode, "onfocus", "_onContainerFocus");
		},

		startupKeyNavChildren: function(){
			kernel.deprecated("startupKeyNavChildren() call no longer needed", "", "2.0");
		},

		startup: function(){
			this.inherited(arguments);
			array.forEach(this.getChildren(), lang.hitch(this, "_startupChild"));
		},

		addChild: function(/*dijit/_WidgetBase*/ widget, /*int?*/ insertIndex){
			this.inherited(arguments);
			this._startupChild(widget);
		},

		focus: function(){
			// summary:
			//		Default focus() implementation: focus the first child.
			this.focusFirstChild();
		},

		focusFirstChild: function(){
			// summary:
			//		Focus the first focusable child in the container.
			// tags:
			//		protected
			this.focusChild(this._getFirstFocusableChild());
		},

		focusLastChild: function(){
			// summary:
			//		Focus the last focusable child in the container.
			// tags:
			//		protected
			this.focusChild(this._getLastFocusableChild());
		},

		focusNext: function(){
			// summary:
			//		Focus the next widget
			// tags:
			//		protected
			this.focusChild(this._getNextFocusableChild(this.focusedChild, 1));
		},

		focusPrev: function(){
			// summary:
			//		Focus the last focusable node in the previous widget
			//		(ex: go to the ComboButton icon section rather than button section)
			// tags:
			//		protected
			this.focusChild(this._getNextFocusableChild(this.focusedChild, -1), true);
		},

		focusChild: function(/*dijit/_WidgetBase*/ widget, /*Boolean*/ last){
			// summary:
			//		Focus specified child widget.
			// widget:
			//		Reference to container's child widget
			// last:
			//		If true and if widget has multiple focusable nodes, focus the
			//		last one instead of the first one
			// tags:
			//		protected

			if(!widget){ return; }

			if(this.focusedChild && widget !== this.focusedChild){
				this._onChildBlur(this.focusedChild);	// used by _MenuBase
			}
			widget.set("tabIndex", this.tabIndex);	// for IE focus outline to appear, must set tabIndex before focs
			widget.focus(last ? "end" : "start");
			this._set("focusedChild", widget);
		},

		_startupChild: function(/*dijit/_WidgetBase*/ widget){
			// summary:
			//		Setup for each child widget
			// description:
			//		Sets tabIndex=-1 on each child, so that the tab key will
			//		leave the container rather than visiting each child.
			// tags:
			//		private

			widget.set("tabIndex", "-1");

			this.connect(widget, "_onFocus", function(){
				// Set valid tabIndex so tabbing away from widget goes to right place, see #10272
				widget.set("tabIndex", this.tabIndex);
			});
			this.connect(widget, "_onBlur", function(){
				widget.set("tabIndex", "-1");
			});
		},

		_onContainerFocus: function(evt){
			// summary:
			//		Handler for when the container gets focus
			// description:
			//		Initially the container itself has a tabIndex, but when it gets
			//		focus, switch focus to first child...
			// tags:
			//		private

			// Note that we can't use _onFocus() because switching focus from the
			// _onFocus() handler confuses the focus.js code
			// (because it causes _onFocusNode() to be called recursively)
			// Also, _onFocus() would fire when focus went directly to a child widget due to mouse click.

			// Ignore spurious focus events:
			//	1. focus on a child widget bubbles on FF
			//	2. on IE, clicking the scrollbar of a select dropdown moves focus from the focused child item to me
			if(evt.target !== this.domNode || this.focusedChild){ return; }

			this.focusFirstChild();

			// and then set the container's tabIndex to -1,
			// (don't remove as that breaks Safari 4)
			// so that tab or shift-tab will go to the fields after/before
			// the container, rather than the container itself
			domAttr.set(this.domNode, "tabIndex", "-1");
		},

		_onBlur: function(evt){
			// When focus is moved away the container, and its descendant (popup) widgets,
			// then restore the container's tabIndex so that user can tab to it again.
			// Note that using _onBlur() so that this doesn't happen when focus is shifted
			// to one of my child widgets (typically a popup)
			if(this.tabIndex){
				domAttr.set(this.domNode, "tabIndex", this.tabIndex);
			}
			this.focusedChild = null;
			this.inherited(arguments);
		},

		_onContainerKeypress: function(evt){
			// summary:
			//		When a key is pressed, if it's an arrow key etc. then
			//		it's handled here.
			// tags:
			//		private
			if(evt.ctrlKey || evt.altKey){ return; }
			var func = this._keyNavCodes[evt.charOrCode];
			if(func){
				func();
				event.stop(evt);
			}
		},

		_onChildBlur: function(/*dijit/_WidgetBase*/ /*===== widget =====*/){
			// summary:
			//		Called when focus leaves a child widget to go
			//		to a sibling widget.
			//		Used by MenuBase.js (TODO: move code there)
			// tags:
			//		protected
		},

		_getFirstFocusableChild: function(){
			// summary:
			//		Returns first child that can be focused
			return this._getNextFocusableChild(null, 1);	// dijit/_WidgetBase
		},

		_getLastFocusableChild: function(){
			// summary:
			//		Returns last child that can be focused
			return this._getNextFocusableChild(null, -1);	// dijit/_WidgetBase
		},

		_getNextFocusableChild: function(child, dir){
			// summary:
			//		Returns the next or previous focusable child, compared
			//		to "child"
			// child: Widget
			//		The current widget
			// dir: Integer
			//		- 1 = after
			//		- -1 = before
			if(child){
				child = this._getSiblingOfChild(child, dir);
			}
			var children = this.getChildren();
			for(var i=0; i < children.length; i++){
				if(!child){
					child = children[(dir>0) ? 0 : (children.length-1)];
				}
				if(child.isFocusable()){
					return child;	// dijit/_WidgetBase
				}
				child = this._getSiblingOfChild(child, dir);
			}
			// no focusable child found
			return null;	// dijit/_WidgetBase
		}
	});
});
