_WidgetBase.js

define([
	"require",			// require.toUrl
	"dojo/_base/array", // array.forEach array.map
	"dojo/aspect",
	"dojo/_base/config", // config.blankGif
	"dojo/_base/declare", // declare
	"dojo/dom", // dom.byId
	"dojo/dom-attr", // domAttr.set domAttr.remove
	"dojo/dom-class", // domClass.add domClass.replace
	"dojo/dom-construct", // domConstruct.destroy domConstruct.place
	"dojo/dom-geometry",	// isBodyLtr
	"dojo/dom-style", // domStyle.set, domStyle.get
	"dojo/has",
	"dojo/_base/kernel",
	"dojo/_base/lang", // mixin(), isArray(), etc.
	"dojo/on",
	"dojo/Stateful", // Stateful
	"dojo/_base/window", // win.doc, win.body()
	"./Destroyable",
	"dojo/has!dojo-bidi?./_BidiMixin",
	"./registry"	// registry.getUniqueId(), registry.findWidgets()
], function(require, array, aspect, config, declare,
			dom, domAttr, domClass, domConstruct, domGeometry, domStyle, has, kernel,
			lang, on, Stateful, win, Destroyable, _BidiMixin, registry){

// module:
//		dijit/_WidgetBase

// Flag to enable support for textdir attribute
has.add("dojo-bidi", false);

// Nested hash listing attributes for each tag, all strings in lowercase.
// ex: {"div": {"style": true, "tabindex" true}, "form": { ...
var tagAttrs = {};
function getAttrs(obj){
	var ret = {};
	for(var attr in obj){
		ret[attr.toLowerCase()] = true;
	}
	return ret;
}

function nonEmptyAttrToDom(attr){
	// summary:
	//		Returns a setter function that copies the attribute to this.domNode,
	//		or removes the attribute from this.domNode, depending on whether the
	//		value is defined or not.
	return function(val){
		domAttr[val ? "set" : "remove"](this.domNode, attr, val);
		this._set(attr, val);
	};
}

var _WidgetBase = declare("dijit._WidgetBase", [Stateful, Destroyable], {
	// summary:
	//		Future base class for all Dijit widgets.
	// description:
	//		Future base class for all Dijit widgets.
	//		_WidgetBase extends this class adding support for various features needed by desktop.
	//
	//		Provides stubs for widget lifecycle methods for subclasses to extend, like postMixInProperties(), buildRendering(),
	//		postCreate(), startup(), and destroy(), and also public API methods like set(), get(), and watch().
	//
	//		Widgets can provide custom setters/getters for widget attributes, which are called automatically by set(name, value).
	//		For an attribute XXX, define methods _setXXXAttr() and/or _getXXXAttr().
	//
	//		_setXXXAttr can also be a string/hash/array mapping from a widget attribute XXX to the widget's DOMNodes:
	//
	//		- DOM node attribute
	// |		_setFocusAttr: {node: "focusNode", type: "attribute"}
	// |		_setFocusAttr: "focusNode"	(shorthand)
	// |		_setFocusAttr: ""		(shorthand, maps to this.domNode)
	//		Maps this.focus to this.focusNode.focus, or (last example) this.domNode.focus
	//
	//		- DOM node innerHTML
	//	|		_setTitleAttr: { node: "titleNode", type: "innerHTML" }
	//		Maps this.title to this.titleNode.innerHTML
	//
	//		- DOM node innerText
	//	|		_setTitleAttr: { node: "titleNode", type: "innerText" }
	//		Maps this.title to this.titleNode.innerText
	//
	//		- DOM node CSS class
	// |		_setMyClassAttr: { node: "domNode", type: "class" }
	//		Maps this.myClass to this.domNode.className
	//
	//		If the value of _setXXXAttr is an array, then each element in the array matches one of the
	//		formats of the above list.
	//
	//		If the custom setter is null, no action is performed other than saving the new value
	//		in the widget (in this).
	//
	//		If no custom setter is defined for an attribute, then it will be copied
	//		to this.focusNode (if the widget defines a focusNode), or this.domNode otherwise.
	//		That's only done though for attributes that match DOMNode attributes (title,
	//		alt, aria-labelledby, etc.)

	// id: [const] String
	//		A unique, opaque ID string that can be assigned by users or by the
	//		system. If the developer passes an ID which is known not to be
	//		unique, the specified ID is ignored and the system-generated ID is
	//		used instead.
	id: "",
	_setIdAttr: "domNode",	// to copy to this.domNode even for auto-generated id's

	// lang: [const] String
	//		Rarely used.  Overrides the default Dojo locale used to render this widget,
	//		as defined by the [HTML LANG](http://www.w3.org/TR/html401/struct/dirlang.html#adef-lang) attribute.
	//		Value must be among the list of locales specified during by the Dojo bootstrap,
	//		formatted according to [RFC 3066](http://www.ietf.org/rfc/rfc3066.txt) (like en-us).
	lang: "",
	// set on domNode even when there's a focus node.	but don't set lang="", since that's invalid.
	_setLangAttr: nonEmptyAttrToDom("lang"),

	// dir: [const] String
	//		Bi-directional support, as defined by the [HTML DIR](http://www.w3.org/TR/html401/struct/dirlang.html#adef-dir)
	//		attribute. Either left-to-right "ltr" or right-to-left "rtl".  If undefined, widgets renders in page's
	//		default direction.
	dir: "",
	// set on domNode even when there's a focus node.	but don't set dir="", since that's invalid.
	_setDirAttr: nonEmptyAttrToDom("dir"),	// to set on domNode even when there's a focus node

	// class: String
	//		HTML class attribute
	"class": "",
	_setClassAttr: { node: "domNode", type: "class" },

	// style: String||Object
	//		HTML style attributes as cssText string or name/value hash
	style: "",

	// title: String
	//		HTML title attribute.
	//
	//		For form widgets this specifies a tooltip to display when hovering over
	//		the widget (just like the native HTML title attribute).
	//
	//		For TitlePane or for when this widget is a child of a TabContainer, AccordionContainer,
	//		etc., it's used to specify the tab label, accordion pane title, etc.
	title: "",

	// tooltip: String
	//		When this widget's title attribute is used to for a tab label, accordion pane title, etc.,
	//		this specifies the tooltip to appear when the mouse is hovered over that text.
	tooltip: "",

	// baseClass: [protected] String
	//		Root CSS class of the widget (ex: dijitTextBox), used to construct CSS classes to indicate
	//		widget state.
	baseClass: "",

	// srcNodeRef: [readonly] DomNode
	//		pointer to original DOM node
	srcNodeRef: null,

	// domNode: [readonly] DomNode
	//		This is our visible representation of the widget! Other DOM
	//		Nodes may by assigned to other properties, usually through the
	//		template system's data-dojo-attach-point syntax, but the domNode
	//		property is the canonical "top level" node in widget UI.
	domNode: null,

	// containerNode: [readonly] DomNode
	//		Designates where children of the source DOM node will be placed.
	//		"Children" in this case refers to both DOM nodes and widgets.
	//		For example, for myWidget:
	//
	//		|	<div data-dojo-type=myWidget>
	//		|		<b> here's a plain DOM node
	//		|		<span data-dojo-type=subWidget>and a widget</span>
	//		|		<i> and another plain DOM node </i>
	//		|	</div>
	//
	//		containerNode would point to:
	//
	//		|		<b> here's a plain DOM node
	//		|		<span data-dojo-type=subWidget>and a widget</span>
	//		|		<i> and another plain DOM node </i>
	//
	//		In templated widgets, "containerNode" is set via a
	//		data-dojo-attach-point assignment.
	//
	//		containerNode must be defined for any widget that accepts innerHTML
	//		(like ContentPane or BorderContainer or even Button), and conversely
	//		is null for widgets that don't, like TextBox.
	containerNode: null,

	// ownerDocument: [const] Document?
	//		The document this widget belongs to.  If not specified to constructor, will default to
	//		srcNodeRef.ownerDocument, or if no sourceRef specified, then to dojo/_base/window::doc
	ownerDocument: null,
	_setOwnerDocumentAttr: function(val){
		// this setter is merely to avoid automatically trying to set this.domNode.ownerDocument
		this._set("ownerDocument", val);
	},

/*=====
	// _started: [readonly] Boolean
	//		startup() has completed.
	_started: false,
=====*/

	// _blankGif: [protected] String
	//		Path to a blank 1x1 image.
	//		Used by `<img>` nodes in templates that really get their image via CSS background-image.
	_blankGif: config.blankGif || require.toUrl("dojo/resources/blank.gif"),

	//////////// INITIALIZATION METHODS ///////////////////////////////////////

	/*=====
	constructor: function(params, srcNodeRef){
		// summary:
		//		Create the widget.
		// params: Object|null
		//		Hash of initialization parameters for widget, including scalar values (like title, duration etc.)
		//		and functions, typically callbacks like onClick.
	 	//		The hash can contain any of the widget's properties, excluding read-only properties.
	 	// srcNodeRef: DOMNode|String?
		//		If a srcNodeRef (DOM node) is specified:
		//
		//		- use srcNodeRef.innerHTML as my contents
		//		- if this is a behavioral widget then apply behavior to that srcNodeRef
		//		- otherwise, replace srcNodeRef with my generated DOM tree
	 },
	=====*/

	_introspect: function(){
		// summary:
		//		Collect metadata about this widget (only once per class, not once per instance):
		//
		//			- list of attributes with custom setters, storing in this.constructor._setterAttrs
		//			- generate this.constructor._onMap, mapping names like "mousedown" to functions like onMouseDown

		var ctor = this.constructor;
		if(!ctor._setterAttrs){
			var proto = ctor.prototype,
				attrs = ctor._setterAttrs = [],			// attributes with custom setters
				onMap = (ctor._onMap = {});

			// Loop over widget properties, collecting properties with custom setters and filling in ctor._onMap.
			for(name in proto){
				if(/^on/.test(name)){
					onMap[name.substring(2).toLowerCase()] = name;
				}

				if(/^_set[A-Z](.*)Attr$/.test(name)){
					name = name.charAt(4).toLowerCase() + name.substr(5, name.length - 9);
					attrs.push(name);
				}
			}

			// Note: this isn't picking up info on properties like aria-label and role, that don't have custom setters
			// but that set() maps to attributes on this.domNode or this.focusNode
		}
	 },

	postscript: function(/*Object?*/params, /*DomNode|String*/srcNodeRef){
		// summary:
		//		Kicks off widget instantiation.  See create() for details.
		// tags:
		//		private

		// Note that we skip calling this.inherited(), i.e. dojo/Stateful::postscript(), because 1.x widgets don't
		// expect their custom setters to get called until after buildRendering().  Consider changing for 2.0.

		this.create(params, srcNodeRef);
	},

	create: function(params, srcNodeRef){
		// summary:
		//		Kick off the life-cycle of a widget
		// description:
		//		Create calls a number of widget methods (postMixInProperties, buildRendering, postCreate,
		//		etc.), some of which of you'll want to override. See http://dojotoolkit.org/reference-guide/dijit/_WidgetBase.html
		//		for a discussion of the widget creation lifecycle.
		//
		//		Of course, adventurous developers could override create entirely, but this should
		//		only be done as a last resort.
		// params: Object|null
		//		Hash of initialization parameters for widget, including scalar values (like title, duration etc.)
		//		and functions, typically callbacks like onClick.
		//		The hash can contain any of the widget's properties, excluding read-only properties.
		// srcNodeRef: DOMNode|String?
		//		If a srcNodeRef (DOM node) is specified:
		//
		//		- use srcNodeRef.innerHTML as my contents
		//		- if this is a behavioral widget then apply behavior to that srcNodeRef
		//		- otherwise, replace srcNodeRef with my generated DOM tree
		// tags:
		//		private

		// First time widget is instantiated, scan prototype to figure out info about custom setters etc.
		this._introspect();

		// store pointer to original DOM tree
		this.srcNodeRef = dom.byId(srcNodeRef);

		// mix in our passed parameters
		if(params){
			this.params = params;
			lang.mixin(this, params);
		}
		this.postMixInProperties();

		// Generate an id for the widget if one wasn't specified, or it was specified as id: undefined.
		// Do this before buildRendering() because it might expect the id to be there.
		if(!this.id){
			this.id = registry.getUniqueId(this.declaredClass.replace(/\./g,"_"));
			if(this.params){
				// if params contains {id: undefined}, prevent _applyAttributes() from processing it
				delete this.params.id;
			}
		}

		// The document and <body> node this widget is associated with
		this.ownerDocument = this.ownerDocument || (this.srcNodeRef ? this.srcNodeRef.ownerDocument : win.doc);
		this.ownerDocumentBody = win.body(this.ownerDocument);

		registry.add(this);

		this.buildRendering();

		var deleteSrcNodeRef;

		if(this.domNode){
			// Call custom setters for all attributes with custom setters.
			this._applyAttributes();

			// If srcNodeRef was specified, then swap out original srcNode for this widget's DOM tree.
			// For 2.0, move this after postCreate().  postCreate() shouldn't depend on the
			// widget being attached to the DOM since it isn't when a widget is created programmatically like
			// new MyWidget({}).	See #11635.
			var source = this.srcNodeRef;
			if(source && source.parentNode && this.domNode !== source){
				source.parentNode.replaceChild(this.domNode, source);
				deleteSrcNodeRef = true;
			}

			// Note: for 2.0 may want to rename widgetId to dojo._scopeName + "_widgetId",
			// assuming that dojo._scopeName even exists in 2.0
			this.domNode.setAttribute("widgetId", this.id);
		}
		this.postCreate();

		// If srcNodeRef has been processed and removed from the DOM (e.g. TemplatedWidget) then delete it to allow GC.
		// I think for back-compatibility it isn't deleting srcNodeRef until after postCreate() has run.
		if(deleteSrcNodeRef){
			delete this.srcNodeRef;
		}

		this._created = true;
	},

	_applyAttributes: function(){
		// summary:
		//		Step during widget creation to copy  widget attributes to the
		//		DOM according to _setXXXAttr objects, and also to call
		//		custom _setXXXAttr() methods.
		//
		//		Skips over blank/false attribute values, unless they were explicitly specified
		//		as parameters to the widget, since those are the default anyway,
		//		and setting tabIndex="" is different than not setting tabIndex at all.
		// tags:
		//		private

		// Call this.set() for each property that was either specified as parameter to constructor,
		// or is in the list found above.	For correlated properties like value and displayedValue, the one
		// specified as a parameter should take precedence.
		// Particularly important for new DateTextBox({displayedValue: ...}) since DateTextBox's default value is
		// NaN and thus is not ignored like a default value of "".

		// Step 1: Save the current values of the widget properties that were specified as parameters to the constructor.
		// Generally this.foo == this.params.foo, except if postMixInProperties() changed the value of this.foo.
		var params = {};
		for(var key in this.params || {}){
			params[key] = this._get(key);
		}

		// Step 2: Call set() for each property with a non-falsy value that wasn't passed as a parameter to the constructor
		array.forEach(this.constructor._setterAttrs, function(key){
			if(!(key in params)){
				var val = this._get(key);
				if(val){
					this.set(key, val);
				}
			}
		}, this);

		// Step 3: Call set() for each property that was specified as parameter to constructor.
		// Use params hash created above to ignore side effects from step #2 above.
		for(key in params){
			this.set(key, params[key]);
		}
	},

	postMixInProperties: function(){
		// summary:
		//		Called after the parameters to the widget have been read-in,
		//		but before the widget template is instantiated. Especially
		//		useful to set properties that are referenced in the widget
		//		template.
		// tags:
		//		protected
	},

	buildRendering: function(){
		// summary:
		//		Construct the UI for this widget, setting this.domNode.
		//		Most widgets will mixin `dijit._TemplatedMixin`, which implements this method.
		// tags:
		//		protected

		if(!this.domNode){
			// Create root node if it wasn't created by _Templated
			this.domNode = this.srcNodeRef || this.ownerDocument.createElement("div");
		}

		// baseClass is a single class name or occasionally a space-separated list of names.
		// Add those classes to the DOMNode.  If RTL mode then also add with Rtl suffix.
		// TODO: make baseClass custom setter
		if(this.baseClass){
			var classes = this.baseClass.split(" ");
			if(!this.isLeftToRight()){
				classes = classes.concat( array.map(classes, function(name){ return name+"Rtl"; }));
			}
			domClass.add(this.domNode, classes);
		}
	},

	postCreate: function(){
		// summary:
		//		Processing after the DOM fragment is created
		// description:
		//		Called after the DOM fragment has been created, but not necessarily
		//		added to the document.  Do not include any operations which rely on
		//		node dimensions or placement.
		// tags:
		//		protected
	},

	startup: function(){
		// summary:
		//		Processing after the DOM fragment is added to the document
		// description:
		//		Called after a widget and its children have been created and added to the page,
		//		and all related widgets have finished their create() cycle, up through postCreate().
		//		This is useful for composite widgets that need to control or layout sub-widgets.
		//		Many layout widgets can use this as a wiring phase.
		if(this._started){ return; }
		this._started = true;
		array.forEach(this.getChildren(), function(obj){
			if(!obj._started && !obj._destroyed && lang.isFunction(obj.startup)){
				obj.startup();
				obj._started = true;
			}
		});
	},

	//////////// DESTROY FUNCTIONS ////////////////////////////////

	destroyRecursive: function(/*Boolean?*/ preserveDom){
		// summary:
		//		Destroy this widget and its descendants
		// description:
		//		This is the generic "destructor" function that all widget users
		//		should call to cleanly discard with a widget. Once a widget is
		//		destroyed, it is removed from the manager object.
		// preserveDom:
		//		If true, this method will leave the original DOM structure
		//		alone of descendant Widgets. Note: This will NOT work with
		//		dijit._TemplatedMixin widgets.

		this._beingDestroyed = true;
		this.destroyDescendants(preserveDom);
		this.destroy(preserveDom);
	},

	destroy: function(/*Boolean*/ preserveDom){
		// summary:
		//		Destroy this widget, but not its descendants.  Descendants means widgets inside of
		//		this.containerNode.   Will also destroy any resources (including widgets) registered via this.own().
		//
		//		This method will also destroy internal widgets such as those created from a template,
		//		assuming those widgets exist inside of this.domNode but outside of this.containerNode.
		//
		//		For 2.0 it's planned that this method will also destroy descendant widgets, so apps should not
		//		depend on the current ability to destroy a widget without destroying its descendants.   Generally
		//		they should use destroyRecursive() for widgets with children.
		// preserveDom: Boolean
		//		If true, this method will leave the original DOM structure alone.
		//		Note: This will not yet work with _TemplatedMixin widgets

		this._beingDestroyed = true;
		this.uninitialize();

		function destroy(w){
			if(w.destroyRecursive){
				w.destroyRecursive(preserveDom);
			}else if(w.destroy){
				w.destroy(preserveDom);
			}
		}

		// Destroy supporting widgets, but not child widgets under this.containerNode (for 2.0, destroy child widgets
		// here too).   if() statement is to guard against exception if destroy() called multiple times (see #15815).
		if(this.domNode){
			array.forEach(registry.findWidgets(this.domNode, this.containerNode), destroy);
		}

		this.destroyRendering(preserveDom);
		registry.remove(this.id);
		this._destroyed = true;
	},

	destroyRendering: function(/*Boolean?*/ preserveDom){
		// summary:
		//		Destroys the DOM nodes associated with this widget.
		// preserveDom:
		//		If true, this method will leave the original DOM structure alone
		//		during tear-down. Note: this will not work with _Templated
		//		widgets yet.
		// tags:
		//		protected

		if(this.bgIframe){
			this.bgIframe.destroy(preserveDom);
			delete this.bgIframe;
		}

		if(this.domNode){
			if(preserveDom){
				domAttr.remove(this.domNode, "widgetId");
			}else{
				domConstruct.destroy(this.domNode);
			}
			delete this.domNode;
		}

		if(this.srcNodeRef){
			if(!preserveDom){
				domConstruct.destroy(this.srcNodeRef);
			}
			delete this.srcNodeRef;
		}
	},

	destroyDescendants: function(/*Boolean?*/ preserveDom){
		// summary:
		//		Recursively destroy the children of this widget and their
		//		descendants.
		// preserveDom:
		//		If true, the preserveDom attribute is passed to all descendant
		//		widget's .destroy() method. Not for use with _Templated
		//		widgets.

		// get all direct descendants and destroy them recursively
		array.forEach(this.getChildren(), function(widget){
			if(widget.destroyRecursive){
				widget.destroyRecursive(preserveDom);
			}
		});
	},

	uninitialize: function(){
		// summary:
		//		Deprecated. Override destroy() instead to implement custom widget tear-down
		//		behavior.
		// tags:
		//		protected
		return false;
	},

	////////////////// GET/SET, CUSTOM SETTERS, ETC. ///////////////////

	_setStyleAttr: function(/*String||Object*/ value){
		// summary:
		//		Sets the style attribute of the widget according to value,
		//		which is either a hash like {height: "5px", width: "3px"}
		//		or a plain string
		// tags:
		//		protected

		var mapNode = this.domNode;

		// Note: technically we should revert any style setting made in a previous call
		// to his method, but that's difficult to keep track of.

		if(lang.isObject(value)){
			domStyle.set(mapNode, value);
		}else{
			if(mapNode.style.cssText){
				mapNode.style.cssText += "; " + value;
			}else{
				mapNode.style.cssText = value;
			}
		}

		this._set("style", value);
	},

	_attrToDom: function(/*String*/ attr, /*String*/ value, /*Object?*/ commands){
		// summary:
		//		Reflect a widget attribute (title, tabIndex, duration etc.) to
		//		the widget DOM, as specified by commands parameter.
		//		Note some attributes like "type"
		//		cannot be processed this way as they are not mutable.
		// attr:
		//		Name of member variable (ex: "focusNode" maps to this.focusNode) pointing
		//		to DOMNode inside the widget, or alternately pointing to a subwidget
		// tags:
		//		private

		array.forEach(lang.isArray(commands) ? commands : [commands], function(command){

			// Get target node and what we are doing to that node
			var mapNode = this[command.node || command || "domNode"];	// DOM node
			var type = command.type || "attribute";	// class, innerHTML, innerText, or attribute

			switch(type){
				case "attribute":
					if(lang.isFunction(value)){ // functions execute in the context of the widget
						value = lang.hitch(this, value);
					}

					// Get the name of the DOM node attribute; usually it's the same
					// as the name of the attribute in the widget (attr), but can be overridden.
					// Also maps handler names to lowercase, like onSubmit --> onsubmit
					var attrName = command.attribute ? command.attribute :
						(/^on[A-Z][a-zA-Z]*$/.test(attr) ? attr.toLowerCase() : attr);

					if(mapNode.tagName){
						// Normal case, mapping to a DOMNode.  Note that modern browsers will have a mapNode.set()
						// method, but for consistency we still call domAttr
						domAttr.set(mapNode, attrName, value);
					}else{
						// mapping to a sub-widget
						mapNode.set(attrName, value);
					}
					break;
				case "innerText":
					mapNode.innerHTML = "";
					mapNode.appendChild(this.ownerDocument.createTextNode(value));
					break;
				case "innerHTML":
					mapNode.innerHTML = value;
					break;
				case "class":
					domClass.replace(mapNode, value, this[attr]);
					break;
			}
		}, this);
	},

	get: function(name){
		// summary:
		//		Get a property from a widget.
		// name:
		//		The property to get.
		// description:
		//		Get a named property from a widget. The property may
		//		potentially be retrieved via a getter method. If no getter is defined, this
		//		just retrieves the object's property.
		//
		//		For example, if the widget has properties `foo` and `bar`
		//		and a method named `_getFooAttr()`, calling:
		//		`myWidget.get("foo")` would be equivalent to calling
		//		`widget._getFooAttr()` and `myWidget.get("bar")`
		//		would be equivalent to the expression
		//		`widget.bar2`
		var names = this._getAttrNames(name);
		return this[names.g] ? this[names.g]() : this._get(name);
	},

	set: function(name, value){
		// summary:
		//		Set a property on a widget
		// name:
		//		The property to set.
		// value:
		//		The value to set in the property.
		// description:
		//		Sets named properties on a widget which may potentially be handled by a
		//		setter in the widget.
		//
		//		For example, if the widget has properties `foo` and `bar`
		//		and a method named `_setFooAttr()`, calling
		//		`myWidget.set("foo", "Howdy!")` would be equivalent to calling
		//		`widget._setFooAttr("Howdy!")` and `myWidget.set("bar", 3)`
		//		would be equivalent to the statement `widget.bar = 3;`
		//
		//		set() may also be called with a hash of name/value pairs, ex:
		//
		//	|	myWidget.set({
		//	|		foo: "Howdy",
		//	|		bar: 3
		//	|	});
		//
		//	This is equivalent to calling `set(foo, "Howdy")` and `set(bar, 3)`

		if(typeof name === "object"){
			for(var x in name){
				this.set(x, name[x]);
			}
			return this;
		}
		var names = this._getAttrNames(name),
			setter = this[names.s];
		if(lang.isFunction(setter)){
			// use the explicit setter
			var result = setter.apply(this, Array.prototype.slice.call(arguments, 1));
		}else{
			// Mapping from widget attribute to DOMNode/subwidget attribute/value/etc.
			// Map according to:
			//		1. _setFooAttr: {...} type attribute in the widget (if one exists)
			//		2. apply to focusNode or domNode if standard attribute name, excluding funcs like onClick.
			// Checks if an attribute is a "standard attribute" by whether the DOMNode JS object has a similar
			// attribute name (ex: accept-charset attribute matches jsObject.acceptCharset).
			// Note also that Tree.focusNode() is a function not a DOMNode, so test for that.
			var defaultNode = this.focusNode && !lang.isFunction(this.focusNode) ? "focusNode" : "domNode",
				tag = this[defaultNode] && this[defaultNode].tagName,
				attrsForTag = tag && (tagAttrs[tag] || (tagAttrs[tag] = getAttrs(this[defaultNode]))),
				map =	names.s in this ? this[names.s] :
						((attrsForTag && names.l in attrsForTag && typeof value != "function") ||
							/^aria-|^data-|^role$/.test(name)) ? defaultNode : null;
			if(map != null){
				this._attrToDom(name, value, map);
			}
			this._set(name, value);
		}
		return result || this;
	},

	_attrPairNames: {},		// shared between all widgets
	_getAttrNames: function(name){
		// summary:
		//		Helper function for get() and set().
		//		Caches attribute name values so we don't do the string ops every time.
		// tags:
		//		private

		var apn = this._attrPairNames;
		if(apn[name]){ return apn[name]; }
		var uc = name.replace(/^[a-z]|-[a-zA-Z]/g, function(c){ return c.charAt(c.length-1).toUpperCase(); });
		return (apn[name] = {
			n: name+"Node",
			s: "_set"+uc+"Attr",	// converts dashes to camel case, ex: accept-charset --> _setAcceptCharsetAttr
			g: "_get"+uc+"Attr",
			l: uc.toLowerCase()		// lowercase name w/out dashes, ex: acceptcharset
		});
	},

	_set: function(/*String*/ name, /*anything*/ value){
		// summary:
		//		Helper function to set new value for specified property, and call handlers
		//		registered with watch() if the value has changed.
		var oldValue = this[name];
		this[name] = value;
		if(this._created && value !== oldValue){
			if(this._watchCallbacks){
				this._watchCallbacks(name, oldValue, value);
			}
			this.emit("attrmodified-" + name, {
				detail: {
					prevValue: oldValue,
					newValue: value
				}
			});
		}
	},

	_get: function(/*String*/ name){
		// summary:
		//		Helper function to get value for specified property stored by this._set(),
		//		i.e. for properties with custom setters.  Used mainly by custom getters.
		//
		//		For example, CheckBox._getValueAttr() calls this._get("value").

		// future: return name in this.props ? this.props[name] : this[name];
		return this[name];
	},

	emit: function(/*String*/ type, /*Object?*/ eventObj, /*Array?*/ callbackArgs){
		// summary:
		//		Used by widgets to signal that a synthetic event occurred, ex:
		//	|	myWidget.emit("attrmodified-selectedChildWidget", {}).
		//
		//		Emits an event on this.domNode named type.toLowerCase(), based on eventObj.
		//		Also calls onType() method, if present, and returns value from that method.
		//		By default passes eventObj to callback, but will pass callbackArgs instead, if specified.
		//		Modifies eventObj by adding missing parameters (bubbles, cancelable, widget).
		// tags:
		//		protected

		// Specify fallback values for bubbles, cancelable in case they are not set in eventObj.
		// Also set pointer to widget, although since we can't add a pointer to the widget for native events
		// (see #14729), maybe we shouldn't do it here?
		eventObj = eventObj || {};
		if(eventObj.bubbles === undefined){ eventObj.bubbles = true; }
		if(eventObj.cancelable === undefined){ eventObj.cancelable = true; }
		if(!eventObj.detail){ eventObj.detail = {}; }
		eventObj.detail.widget = this;

		var ret, callback = this["on"+type];
		if(callback){
			ret = callback.apply(this, callbackArgs ? callbackArgs : [eventObj]);
		}

		// Emit event, but avoid spurious emit()'s as parent sets properties on child during startup/destroy
		if(this._started && !this._beingDestroyed){
			on.emit(this.domNode, type.toLowerCase(), eventObj);
		}

		return ret;
	},

	on: function(/*String|Function*/ type, /*Function*/ func){
		// summary:
		//		Call specified function when event occurs, ex: myWidget.on("click", function(){ ... }).
		// type:
		//		Name of event (ex: "click") or extension event like touch.press.
		// description:
		//		Call specified function when event `type` occurs, ex: `myWidget.on("click", function(){ ... })`.
		//		Note that the function is not run in any particular scope, so if (for example) you want it to run in the
		//		widget's scope you must do `myWidget.on("click", lang.hitch(myWidget, func))`.

		// For backwards compatibility, if there's an onType() method in the widget then connect to that.
		// Remove in 2.0.
		var widgetMethod = this._onMap(type);
		if(widgetMethod){
			return aspect.after(this, widgetMethod, func, true);
		}

		// Otherwise, just listen for the event on this.domNode.
		return this.own(on(this.domNode, type, func))[0];
	},

	_onMap: function(/*String|Function*/ type){
		// summary:
		//		Maps on() type parameter (ex: "mousemove") to method name (ex: "onMouseMove").
		//		If type is a synthetic event like touch.press then returns undefined.
		var ctor = this.constructor, map = ctor._onMap;
		if(!map){
			map = (ctor._onMap = {});
			for(var attr in ctor.prototype){
				if(/^on/.test(attr)){
					map[attr.replace(/^on/, "").toLowerCase()] = attr;
				}
			}
		}
		return map[typeof type == "string" && type.toLowerCase()];	// String
	},

	toString: function(){
		// summary:
		//		Returns a string that represents the widget.
		// description:
		//		When a widget is cast to a string, this method will be used to generate the
		//		output. Currently, it does not implement any sort of reversible
		//		serialization.
		return '[Widget ' + this.declaredClass + ', ' + (this.id || 'NO ID') + ']'; // String
	},

	getChildren: function(){
		// summary:
		//		Returns all direct children of this widget, i.e. all widgets underneath this.containerNode whose parent
		//		is this widget.   Note that it does not return all descendants, but rather just direct children.
		//		Analogous to [Node.childNodes](https://developer.mozilla.org/en-US/docs/DOM/Node.childNodes),
		//		except containing widgets rather than DOMNodes.
		//
		//		The result intentionally excludes internally created widgets (a.k.a. supporting widgets)
		//		outside of this.containerNode.
		//
		//		Note that the array returned is a simple array.  Application code should not assume
		//		existence of methods like forEach().

		return this.containerNode ? registry.findWidgets(this.containerNode) : []; // dijit/_WidgetBase[]
	},

	getParent: function(){
		// summary:
		//		Returns the parent widget of this widget.

		return registry.getEnclosingWidget(this.domNode.parentNode);
	},

	isLeftToRight: function(){
		// summary:
		//		Return this widget's explicit or implicit orientation (true for LTR, false for RTL)
		// tags:
		//		protected
		return this.dir ? (this.dir == "ltr") : domGeometry.isBodyLtr(this.ownerDocument); //Boolean
	},

	isFocusable: function(){
		// summary:
		//		Return true if this widget can currently be focused
		//		and false if not
		return this.focus && (domStyle.get(this.domNode, "display") != "none");
	},

	placeAt: function(/* String|DomNode|_WidgetBase */ reference, /* String|Int? */ position){
		// summary:
		//		Place this widget somewhere in the DOM based
		//		on standard domConstruct.place() conventions.
		// description:
		//		A convenience function provided in all _Widgets, providing a simple
		//		shorthand mechanism to put an existing (or newly created) Widget
		//		somewhere in the dom, and allow chaining.
		// reference:
		//		Widget, DOMNode, or id of widget or DOMNode
		// position:
		//		If reference is a widget (or id of widget), and that widget has an ".addChild" method,
		//		it will be called passing this widget instance into that method, supplying the optional
		//		position index passed.  In this case position (if specified) should be an integer.
		//
		//		If reference is a DOMNode (or id matching a DOMNode but not a widget),
		//		the position argument can be a numeric index or a string
		//		"first", "last", "before", or "after", same as dojo/dom-construct::place().
		// returns: dijit/_WidgetBase
		//		Provides a useful return of the newly created dijit._WidgetBase instance so you
		//		can "chain" this function by instantiating, placing, then saving the return value
		//		to a variable.
		// example:
		//	|	// create a Button with no srcNodeRef, and place it in the body:
		//	|	var button = new Button({ label:"click" }).placeAt(win.body());
		//	|	// now, 'button' is still the widget reference to the newly created button
		//	|	button.on("click", function(e){ console.log('click'); }));
		// example:
		//	|	// create a button out of a node with id="src" and append it to id="wrapper":
		//	|	var button = new Button({},"src").placeAt("wrapper");
		// example:
		//	|	// place a new button as the first element of some div
		//	|	var button = new Button({ label:"click" }).placeAt("wrapper","first");
		// example:
		//	|	// create a contentpane and add it to a TabContainer
		//	|	var tc = dijit.byId("myTabs");
		//	|	new ContentPane({ href:"foo.html", title:"Wow!" }).placeAt(tc)

		var refWidget = !reference.tagName && registry.byId(reference);
		if(refWidget && refWidget.addChild && (!position || typeof position === "number")){
			// Adding this to refWidget and can use refWidget.addChild() to handle everything.
			refWidget.addChild(this, position);
		}else{
			// "reference" is a plain DOMNode, or we can't use refWidget.addChild().   Use domConstruct.place() and
			// target refWidget.containerNode for nested placement (position==number, "first", "last", "only"), and
			// refWidget.domNode otherwise ("after"/"before"/"replace").  (But not supported officially, see #14946.)
			var ref = refWidget ?
				(refWidget.containerNode && !/after|before|replace/.test(position||"") ?
					refWidget.containerNode : refWidget.domNode) : dom.byId(reference, this.ownerDocument);
			domConstruct.place(this.domNode, ref, position);

			// Start this iff it has a parent widget that's already started.
			if(!this._started && (this.getParent() || {})._started){
				this.startup();
			}
		}
		return this;
	},

	defer: function(fcn, delay){
		// summary:
		//		Wrapper to setTimeout to avoid deferred functions executing
		//		after the originating widget has been destroyed.
		//		Returns an object handle with a remove method (that returns null) (replaces clearTimeout).
		// fcn: function reference
		// delay: Optional number (defaults to 0)
		// tags:
		//		protected.
		var timer = setTimeout(lang.hitch(this, 
			function(){ 
				if(!timer){ return; }
				timer = null;
				if(!this._destroyed){ 
					lang.hitch(this, fcn)(); 
				} 
			}),
			delay || 0
		);
		return {
			remove:	function(){
					if(timer){
						clearTimeout(timer);
						timer = null;
					}
					return null; // so this works well: handle = handle.remove();
				}
		};
	}
});

if(has("dojo-bidi")){
	_WidgetBase.extend(_BidiMixin);
}

return _WidgetBase;
});