Control.js

/**
	_enyo.Control_ is a component that controls a DOM node (i.e., an element in
	the user interface). Controls are generally visible and the user often
	interacts with them directly. While things like buttons and input boxes are
	obviously controls, in Enyo, a control may become as complex as an entire
	application.

	If you make changes to _enyo.Control_, be sure to add or update the	appropriate
	[unit tests](https://github.com/enyojs/enyo/tree/master/tools/test/core/tests).

	For more information, see the documentation on
	<a href="https://github.com/enyojs/enyo/wiki/Creating-Controls">Controls</a>
	in the Enyo Developer Guide.
*/
enyo.kind({
	name: "enyo.Control",
	kind: enyo.UiComponent,
	published: {
		/**
			HTML tag name to use for the control. If null, no tag is generated;
			only the contents are used.
		*/
		tag: "div",
		//* Hash of DOM attributes to apply to the generated HTML tag
		attributes: null,
		//* Space-delimited set of CSS classes to apply to the generated HTML tag
		classes: "",
		//* Style attribute to apply to the generated HTML tag
		style: "",
		/**
			Content that will be generated inside the HTML tag; defaults to
			plain text unless _allowHtml_ is true
		*/
		content: "",
		//*	Boolean indicating whether the tag will be visible in the document
		showing: true,
		//* If false, HTML codes in _content_ are escaped before rendering
		allowHtml: false,
		//
		// convenience properties for common attributes
		//
		//* Shortcut for setting _src_ attribute in _attributes_ hash. Overrides that value.
		src: "",
		//
		// esoteric
		//
		/**
			Set to false if the control should not generate any HTML. Used to
			inhibit generation of popups until they're shown at runtime.
		*/
		canGenerate: true,
		//
		// ad hoc properties:
		//
		/**
			Flag used by control layouts to determine which control will expand
			to fill the available space. This only has meaning when the control
			is being used as a child of a control with a version of FittableLayout
			as its layoutKind.
		*/
		fit: false,
		//* Used by Ares design editor for design objects
		isContainer: false
	},
	handlers: {
		//* Controls will call a user-provided _tap_ method when tapped upon.
		ontap: "tap"
	},
	//* The default kind for controls created inside this control that don't
	//* specify their own kind
	defaultKind: "Control",
	//* A set of CSS classes that are applied to controls created inside this control
	controlClasses: "",
	//* @protected
	node: null,
	generated: false,
	create: function() {
		// initialize style databases
		this.initStyles();
		// superkind initialization
		this.inherited(arguments);
		// 'showing' is tertiary method for modifying display style
		// setting 'display: none;' style at initialization time will
		// not work if 'showing' is true.
		this.showingChanged();
		// Notes:
		// - 'classes' does not reflect the complete set of classes on an object; the complete set is in
		//   this.attributes.class. The '*Class' apis affect this.attributes.class.
		// - use addClass instead of setClasses here, by convention 'classes' is reserved for instance objects
		// - inheritors should 'addClass' to add classes
		// - setClasses removes the old classes and adds the new one, setClassAttribute replaces all classes
		this.addClass(this.kindClasses);
		this.addClass(this.classes);
		this.initProps(["id", "content", "src"]);
	},
	destroy: function() {
		this.removeNodeFromDom();
		enyo.Control.unregisterDomEvents(this.id);
		this.inherited(arguments);
	},
	importProps: function(inProps) {
		this.inherited(arguments);
		// each instance has its own attributes array, the union of the prototype attributes and user-specified attributes
		this.attributes = enyo.mixin(enyo.clone(this.kindAttributes), this.attributes);
	},
	initProps: function(inPropNames) {
		// for each named property, trigger the *Changed handler if the property value is truthy
		for (var i=0, n, cf; (n=inPropNames[i]); i++) {
			if (this[n]) {
				// FIXME: awkward
				cf = n + "Changed";
				if (this[cf]) {
					this[cf]();
				}
			}
		}
	},
	classesChanged: function(inOld) {
		this.removeClass(inOld);
		this.addClass(this.classes);
	},
	// modify components we create ourselves
	/*
	adjustComponentProps: function(inProps) {
		if (this.controlClasses) {
			inProps.classes = (inProps.classes ? inProps.classes + " " : "") + this.controlClasses;
		}
		this.inherited(arguments);
	},
	*/
	addChild: function(inControl) {
		inControl.addClass(this.controlClasses);
		this.inherited(arguments);
	},
	removeChild: function(inControl) {
		this.inherited(arguments);
		inControl.removeClass(this.controlClasses);
	},
	// event filter
	strictlyInternalEvents: {onenter: 1, onleave: 1},
	dispatchEvent: function(inEventName, inEvent, inSender) {
		// prevent dispatch and bubble of events that are strictly internal (e.g. enter/leave)
		if (this.strictlyInternalEvents[inEventName] && this.isInternalEvent(inEvent)) {
			return true;
		}
		return this.inherited(arguments);
	},
	isInternalEvent: function(inEvent) {
		var rdt = enyo.dispatcher.findDispatchTarget(inEvent.relatedTarget);
		return rdt && rdt.isDescendantOf(this);
	},
	//
	//* @public
	/**
		Returns the DOM node representing the control.
		If the control is not currently rendered, returns null.

		If hasNode() returns a value, the _node_ property will be valid and
		can be checked directly.

		Once hasNode() is called, the returned value is made available in
		the _node_ property of this control.

		A control will only return a node if it has been rendered.

			if (this.hasNode()) {
				enyo.log(this.node.nodeType);
			}
	*/
	hasNode: function() {
		// 'generated' is used to gate access to expensive findNodeById call
		return this.generated && (this.node || this.findNodeById());
	},
	/**
		Appends the string value of _inAddendum_ to the _content_ of this
		control.
	*/
	addContent: function(inAddendum) {
		this.setContent(this.content + inAddendum);
	},
	/**
		Gets the value of an attribute on this object.

		If this control has a node, the attribute value is retrieved from the
		node; otherwise, it's read from the _attributes_ property of the control
		itself.

		Caveat: If the control is rendered, the _attributes_ property is used to
		construct the rendering, and values that have changed on the node itself
		are lost.

			// Get the value attribute for this DomNode
			var value = this.getAttribute("tabIndex");
	*/
	getAttribute: function(inName) {
		return this.hasNode() ? this.node.getAttribute(inName) : this.attributes[inName];
	},
	/**
		Sets the value of an attribute on this object. Pass null _inValue_ to
		remove an attribute.

			// set the tabIndex attribute for this DomNode
			this.setAttribute("tabIndex", 3);
			...
			// remove the index attribute
			this.setAttribute("index", null);
	*/
	setAttribute: function(inName, inValue) {
		this.attributes[inName] = inValue;
		if (this.hasNode()) {
			this.attributeToNode(inName, inValue);
		}
		this.invalidateTags();
	},
	/**
		Gets the value of a property named _inName_ directly from the DOM node.
		A caller-specified default value, _inDefault_, is returned when the DOM
		node has not yet been created.
	*/
	getNodeProperty: function(inName, inDefault) {
		if (this.hasNode()) {
			return this.node[inName];
		} else {
			return inDefault;
		}
	},
	/**
		Sets the value of the _inName_ property on the control's DOM node to
		_inValue_, if and only if the DOM node has been rendered.  This method
		does not alter any values cached in local properties of the
		_enyo.Control_ instance.
	*/
	setNodeProperty: function(inName, inValue) {
		if (this.hasNode()) {
			this.node[inName] = inValue;
		}
	},
	/**
		Convenience function for setting the _class_ attribute.
		The _class_ attribute represents the CSS classes assigned to this object;
		it is a string that can contain multiple CSS classes separated by spaces.

			this.$.control.setClassAttribute("box blue-border highlighted");
	*/
	setClassAttribute: function(inClass) {
		this.setAttribute("class", inClass);
	},
	/**
		Convenience function for getting the _class_ attribute.
		The _class_ attribute represents the CSS classes assigned to this object;
		it is a string that can contain multiple CSS classes separated by spaces.

			var cssClasses = this.$.control.getClassAttribute();
	*/
	getClassAttribute: function() {
		return this.attributes["class"] || "";
	},
	/**
		Returns true if the _class_ attribute contains a substring matching
		_inClass_.

		The _class_ attribute is a string that can contain multiple CSS classes.
		This method tests whether a particular class is part of the set of
		classes on this control.

			// returns true if _class_ is "bar foo baz", but false for "barfoobaz"
			var hasFooClass = this.$.control.hasClass("foo");
	*/
	hasClass: function(inClass) {
		return inClass && ((" " + this.getClassAttribute() + " ").indexOf(" " + inClass + " ") >= 0);
	},
	/**
		Adds CSS class name _inClass_ to the _class_ attribute of this object.

			// add the highlight class to this object
			this.addClass("highlight");
	*/
	addClass: function(inClass) {
		if (inClass && !this.hasClass(inClass)) {
			var c = this.getClassAttribute();
			this.setClassAttribute(c + (c ? " " : "") + inClass);
		}
	},
	/**
		Removes substring _inClass_ from the _class_ attribute of this object.

		_inClass_ must have no leading or trailing spaces.

		Using a compound class name is supported, but the name is treated
		atomically. For example, given _"a b c"_, _removeClass("a b")_ will
		produce _"c"_, but _removeClass("a c")_ will produce _"a b c"_.

			// remove the highlight class from this object
			this.removeClass("highlight");
	*/
	removeClass: function(inClass) {
		if (inClass && this.hasClass(inClass)) {
			var c = this.getClassAttribute();
			c = (" " + c + " ").replace(" " + inClass + " ", " ").slice(1, -1);
			this.setClassAttribute(c);
		}
	},
	/**
		Adds or removes substring _inClass_ from the _class_ attribute of this
		object based on the value of _inTrueToAdd_.

		If _inTrueToAdd_ is truthy, then _inClass_ is added; otherwise,
		_inClass_ is removed.

			// add or remove the highlight class, depending on the "highlighted" property
			this.addRemoveClass("highlight", this.highlighted);
	*/
	addRemoveClass: function(inClass, inTrueToAdd) {
		this[inTrueToAdd ? "addClass" : "removeClass"](inClass);
	},
	//
	// styles
	//
	//* @protected
	initStyles: function() {
		this.domStyles = this.domStyles || {};
		enyo.Control.cssTextToDomStyles(this.kindStyle, this.domStyles);
		this.domCssText = enyo.Control.domStylesToCssText(this.domStyles);
	},
	styleChanged: function() {
		// FIXME: stomping on domStyles is problematic, there may be styles on this object
		// applied by layouts or other objects.
		// We may need a 'runtimeStyles' concept separate from a 'userStyles' concept, although
		// it's not clear what API calls like 'applyStyle' would affect, and which concept would take
		// precedence when there is a conflict.
		// Perhaps we can separate 'style' completely from 'domStyles'. API methods like applyStyle
		// would affect domStyles, and the two style databases would be combined at render-time.
		// Alternatively, we can disallow changing "style" string at runtime and allow it to be set
		// at init-time only (as it was in pre-ares enyo).
		//this.domStyles = {};
		//this.addStyles(this.kindStyle);
		//this.addStyles(this.style);
		this.invalidateTags();
		this.renderStyles();
	},
	//* @public
	/**
		Applies a single style value to this object.

			this.$.box.applyStyle("z-index", 4);

		You may remove a style by setting its value to null.

			this.$.box.applyStyle("z-index", null);
	*/
	applyStyle: function(inStyle, inValue) {
		this.domStyles[inStyle] = inValue;
		this.domStylesChanged();
	},
	/**
		Adds CSS styles to the set of styles assigned to this object.

		_inCssText_ is a string containing CSS styles in text format.

			this.$.box.addStyles("background-color: red; padding: 4px;");
	*/
	addStyles: function(inCssText) {
		enyo.Control.cssTextToDomStyles(inCssText, this.domStyles);
		this.domStylesChanged();
	},
	/**
		Returns the computed value of a CSS style named from _inStyle_
		for the DOM node of the control. If the node hasn't been generated,
		returns _inDefault_ as a default value. This uses CSS-style property
		names, not JavaScript-style names, so use "font-family" instead of
		"fontFamily".
	*/
	getComputedStyleValue: function(inStyle, inDefault) {
		if (this.hasNode()) {
			return enyo.dom.getComputedStyleValue(this.node, inStyle);
		}
		return inDefault;
	},
	//* @protected
	domStylesChanged: function() {
		this.domCssText = enyo.Control.domStylesToCssText(this.domStyles);
		this.invalidateTags();
		this.renderStyles();
	},
	stylesToNode: function() {
		this.node.style.cssText = this.style + (this.style[this.style.length-1] == ';' ? ' ' : '; ') + this.domCssText;
	},
	setupBodyFitting: function() {
		enyo.dom.applyBodyFit();
		this.addClass("enyo-fit enyo-clip");
	},
	/*
		If the platform is Android or Android-Chrome, don't include
		the css rule -webkit-overflow-scrolling: touch, as it is
		not supported in Android and leads to overflow issues
		(ENYO-900 and ENYO-901)
		Similarly, BB10 has issues repainting out-of-viewport content
		when -webkit-overflow-scrolling is used (ENYO-1396)
	*/
	setupOverflowScrolling: function() {
		if(enyo.platform.android || enyo.platform.androidChrome || enyo.platform.blackberry)
			return;
		document.getElementsByTagName("body")[0].className += " webkitOverflowScrolling";
	},
	//
	//
	//* @public
	/**
		Renders this object into DOM, generating a DOM node if needed.
	*/
	render: function() {
		if (this.parent) {
			// allow the parent to perform setup tasks
			// note: ('parent.generated' may change here)
			this.parent.beforeChildRender(this);
			// don't render if the parent has not generated
			if (!this.parent.generated) {
				return this;
			}
		}
		if (!this.hasNode()) {
			this.renderNode();
		}
		if (this.hasNode()) {
			this.renderDom();
			if (this.generated) {
				this.rendered();
			}
		}
		// return 'this' to support method chaining
		return this;
	},
	/**
		Renders this object into the DOM node referenced by _inParentNode_.
		If rendering into the document body element, appropriate styles will
		be used to have it expand to fill the whole window.
	*/
	renderInto: function(inParentNode) {
		// clean up render flags and memoizations
		this.teardownRender();
		// inParentNode can be a string id or a node reference
		var pn = enyo.dom.byId(inParentNode);
		if (pn == document.body) {
			this.setupBodyFitting();
		} else if (this.fit) {
			this.addClass("enyo-fit enyo-clip");
		}
		// for IE10 support, we want full support over touch actions in Enyo-rendered areas
		this.addClass("enyo-no-touch-action");
		// add css to enable hw-accelerated scrolling on non-Android platforms (ENYO-900, ENYO-901)
		this.setupOverflowScrolling();
		// generate our HTML
		enyo.dom.setInnerHtml(pn, this.generateHtml());
		// post-rendering tasks
		if (this.generated) {
			this.rendered();
		}
		// support method chaining
		return this;
	},
	/**
		Uses _document.write_ to output the control into the document.
		If the control has _fit: true_ defined, appropriate styles will be set
		to have it expand to fill its container.

		Note that this has all the limitations that _document.write_ has.
		It only works while the page is loading, so you can't call this	from an
		event handler. Also, it will not work in certain environments, such as
		Chrome Packaged Apps or Windows 8.
	*/
	write: function() {
		if (this.fit) {
			this.setupBodyFitting();
		}
		// for IE10 support, we want full support over touch actions in Enyo-rendered areas
		this.addClass("enyo-no-touch-action");
		// add css to enable hw-accelerated scrolling on non-Android platforms (ENYO-900, ENYO-901)
		this.setupOverflowScrolling();
		document.write(this.generateHtml());
		// post-rendering tasks
		if (this.generated) {
			this.rendered();
		}
		// support method chaining
		return this;
	},
	/**
		Override this method to perform tasks that require access to the DOM node.

			rendered: function() {
				this.inherited(arguments);
				// do some task
			}
	*/
	rendered: function() {
		// CAVEAT: Currently we use one entry point ('reflow') for
		// post-render layout work *and* post-resize layout work.
		this.reflow();
		for (var i=0, c; (c=this.children[i]); i++) {
			if (c.generated) {
				c.rendered();
			}
		}
	},
	/**
		Shows this node (alias for _setShowing(true)_).
	*/
	show: function() {
		this.setShowing(true);
	},
	/**
		Hides this node (alias for _setShowing(false)_).
	*/
	hide: function() {
		this.setShowing(false);
	},
	//* Focus on this control
	focus: function() {
		if (this.hasNode()) {
			this.node.focus();
		}
	},
	//* Blur this control
	blur: function() {
		if (this.hasNode()) {
			this.node.blur();
		}
	},
	//* Returns true if the control is focused.
	hasFocus: function() {
		if (this.hasNode()) {
			return document.activeElement === this.node;
		}
	},
	/**
		Returns an object describing the geometry of this object, like so:

			{left: _offsetLeft_, top: _offsetTop_, width: _offsetWidth_, height: _offsetHeight_}

		Values returned are only valid if _hasNode()_ is truthy.
		If there's no DOM node for the object, this returns a bounds structure with
		_undefined_ as the value of all fields.

			var bounds = this.getBounds();
			enyo.log(bounds.width);
	*/
	getBounds: function() {
		var n = this.node || this.hasNode();
		var b = enyo.dom.getBounds(n);
		return b || {left: undefined, top: undefined, width: undefined, height: undefined};
	},
	/**
		Sets any or all of the geometry style properties _width_, _height_,
		_left_, _top_, _right_ and _bottom_.

		Values may be specified as strings (with units included), or as numbers
		when a unit is provided in _inUnit_.

			this.setBounds({width: 100, height: 100}, "px"); // adds style properties like "width: 100px; height: 100px;"
			//
			this.setBounds({width: "10em", right: "30pt"}); // adds style properties like "width: 10em; right: 30pt;"
	*/
	setBounds: function(inBounds, inUnit) {
		var s = this.domStyles, unit = inUnit || "px";
		var extents = ["width", "height", "left", "top", "right", "bottom"];
		for (var i=0, b, e; (e=extents[i]); i++) {
			b = inBounds[e];
			if (b || b === 0) {
				s[e] = b + (!enyo.isString(b) ? unit : '');
			}
		}
		this.domStylesChanged();
	},
	//* @protected
	// expensive, other methods do work to avoid calling here
	findNodeById: function() {
		return this.id && (this.node = enyo.dom.byId(this.id));
	},
	idChanged: function(inOld) {
		if (inOld) {
			enyo.Control.unregisterDomEvents(inOld);
		}
		this.setAttribute("id", this.id);
		if (this.id) {
			enyo.Control.registerDomEvents(this.id, this);
		}
	},
	contentChanged: function() {
		if (this.hasNode()) {
			this.renderContent();
		}
	},
	getSrc: function() {
		return this.getAttribute("src");
	},
	srcChanged: function() {
		this.setAttribute("src", enyo.path.rewrite(this.src));
	},
	attributesChanged: function() {
		this.invalidateTags();
		this.renderAttributes();
	},
	//
	// HTML rendering
	//
	generateHtml: function() {
		if (this.canGenerate === false) {
			return '';
		}
		// do this first in case content generation affects outer html (styles or attributes)
		var c = this.generateInnerHtml();
		// generate tag, styles, attributes
		var h = this.generateOuterHtml(c);
		// NOTE: 'generated' is used to gate access to findNodeById in
		// hasNode, because findNodeById is expensive.
		// NOTE: we typically use 'generated' to mean 'created in DOM'
		// but that has not actually happened at this point.
		// We set 'generated = true' here anyway to avoid having to walk the
		// control tree a second time (to set it later).
		// The contract is that insertion in DOM will happen synchronously
		// to generateHtml() and before anybody should be calling hasNode().
		this.generated = true;
		return h;
	},
	generateInnerHtml: function() {
		// Flow can alter the way that html content is rendered inside
		// the container regardless of whether there are children.
		this.flow();
		if (this.children.length) {
			return this.generateChildHtml();
		} else {
			return this.allowHtml ? this.content : enyo.Control.escapeHtml(this.content);
		}
	},
	generateChildHtml: function() {
		var results = '';
		for (var i=0, c; (c=this.children[i]); i++) {
			var h = c.generateHtml();
			results += h;
		}
		return results;
	},
	generateOuterHtml: function(inContent) {
		if (!this.tag) {
			return inContent;
		}
		if (!this.tagsValid) {
			this.prepareTags();
		}
		return this._openTag + inContent + this._closeTag;
	},
	invalidateTags: function() {
		this.tagsValid = false;
	},
	prepareTags: function() {
		var htmlStyle = this.domCssText + this.style;
		this._openTag = '<' +
			this.tag +
			(htmlStyle ? ' style="' + htmlStyle + '"' : "") +
			enyo.Control.attributesToHtml(this.attributes);
		if (enyo.Control.selfClosing[this.tag]) {
			this._openTag += '/>';
			this._closeTag =  '';
		} else {
			this._openTag += '>';
			this._closeTag =  '</' + this.tag + '>';
		}
		this.tagsValid = true;
	},
	// DOM, aka direct-to-node, rendering
	attributeToNode: function(inName, inValue) {
		if (inValue === null || inValue === false || inValue === "") {
			this.node.removeAttribute(inName);
		} else {
			this.node.setAttribute(inName, inValue);
		}
	},
	attributesToNode: function() {
		for (var n in this.attributes) {
			this.attributeToNode(n, this.attributes[n]);
		}
	},
	getParentNode: function() {
		return this.parentNode || (this.parent && (this.parent.hasNode() || this.parent.getParentNode()));
	},
	addNodeToParent: function() {
		if (this.node) {
			var pn = this.getParentNode();
			if (pn) {
				if (this.addBefore !== undefined) {
					this.insertNodeInParent(pn, this.addBefore && this.addBefore.hasNode());
				} else {
					this.appendNodeToParent(pn);
				}
			}
		}
	},
	appendNodeToParent: function(inParentNode) {
		inParentNode.appendChild(this.node);
	},
	insertNodeInParent: function(inParentNode, inBeforeNode) {
		inParentNode.insertBefore(this.node, inBeforeNode || inParentNode.firstChild);
	},
	removeNodeFromDom: function() {
		if (this.hasNode() && this.node.parentNode) {
			this.node.parentNode.removeChild(this.node);
		}
	},
	teardownRender: function() {
		if (this.generated) {
			this.teardownChildren();
		}
		this.node = null;
		this.generated = false;
	},
	teardownChildren: function() {
		for (var i=0, c; (c=this.children[i]); i++) {
			c.teardownRender();
		}
	},
	renderNode: function() {
		this.teardownRender();
		this.node = document.createElement(this.tag);
		this.addNodeToParent();
		this.generated = true;
	},
	renderDom: function() {
		this.renderAttributes();
		this.renderStyles();
		this.renderContent();
	},
	renderContent: function() {
		if (this.generated) {
			this.teardownChildren();
		}
		enyo.dom.setInnerHtml(this.node, this.generateInnerHtml());
	},
	renderStyles: function() {
		if (this.hasNode()) {
			this.stylesToNode();
		}
	},
	renderAttributes: function() {
		if (this.hasNode()) {
			this.attributesToNode();
		}
	},
	beforeChildRender: function() {
		// if we are generated, we should flow before rendering a child
		// if not, the render context isn't ready anyway
		if (this.generated) {
			this.flow();
		}
	},
	syncDisplayToShowing: function() {
		var ds = this.domStyles;
		if (this.showing) {
			// note: only show a node if it's actually hidden
			// this way we prevent overriding the value of domStyles.display
			if (ds.display == "none") {
				this.applyStyle("display", this._displayStyle || "");
			}
		} else {
			// cache the previous showing value of display
			// note: we could use a class to hide a node, but then
			// hide would not override a setting of display: none in style,
			// which seems bad.
			this._displayStyle = (ds.display == "none" ? "" : ds.display);
			this.applyStyle("display", "none");
		}
	},
	showingChanged: function() {
		this.syncDisplayToShowing();
	},
	getShowing: function() {
		// 'showing' specifically means domStyles.display !== 'none'.
		// 'showing' does not imply the node is actually visible or even rendered in DOM,
		// it simply reflects this state of this specific property as a convenience.
		return this.showing = (this.domStyles.display != "none");
	},
	//
	//
	fitChanged: function(inOld) {
		this.parent.reflow();
	},
	//
	//
	statics: {
		/**
			Returns passed-in string with ampersand, less-than, and greater-than
			characters replaced by HTML entities, e.g.,
			'&lt;code&gt;"This &amp; That"&lt;/code&gt;' becomes
			'&amp;lt;code&amp;gt;"This &amp;amp; That"&amp;lt;/code&amp;gt;'
		*/
		escapeHtml: function(inText) {
			return inText != null ? String(inText).replace(/&/g,'&amp;').replace(/</g,'&lt;').replace(/>/g,'&gt;') : '';
		},
		//* @protected
		registerDomEvents: function(inId, inControl) {
			enyo.$[inId] = inControl;
		},
		unregisterDomEvents: function(inId) {
			enyo.$[inId] = null;
		},
		selfClosing: {img: 1, hr: 1, br: 1, area: 1, base: 1, basefont: 1, input: 1, link: 1, meta: 1,
			command: 1, embed: 1, keygen: 1, wbr: 1, param: 1, source: 1, track: 1, col: 1},
		cssTextToDomStyles: function(inText, inStyleHash) {
			if (inText) {
				// remove spaces between rules, then split rules on delimiter (;)
				var rules = inText.replace(/; /g, ";").split(";");
				// parse string styles into name/value pairs
				for (var i=0, s, n, v, rule; (rule=rules[i]); i++) {
					// "background-image: url(http://foo.com/foo.png)" => ["background-image", "url(http", "//foo.com/foo.png)"]
					s = rule.split(":");
					// n = "background-image", s = ["url(http", "//foo.com/foo.png)"]
					n = s.shift();
					// v = ["url(http", "//foo.com/foo.png)"].join(':') = "url(http://foo.com/foo.png)"
					v = s.join(':');
					// store name/value pair
					inStyleHash[n] = v;
				}
			}
		},
		domStylesToCssText: function(inStyleHash) {
			var n, v, text = '';
			for (n in inStyleHash) {
				v = inStyleHash[n];
				if ((v !== null) && (v !== undefined) && (v !== "")) {
					text +=  n + ':' + v + ';';
				}
			}
			return text;
		},
		stylesToHtml: function(inStyleHash) {
			var cssText = enyo.Control.domStylesToCssText(inStyleHash);
			return (cssText ? ' style="' + cssText + '"' : "");
		},
		/**
			Returns passed-in string with ampersand and double quote characters
			replaced by HTML entities, e.g., 'hello from "Me & She"' becomes
			'hello from &amp;quot;Me &amp;amp; She&amp;quot;'
		*/
		escapeAttribute: function(inText) {
			return !enyo.isString(inText) ? inText : String(inText).replace(/&/g,'&amp;').replace(/\"/g,'&quot;');
		},
		attributesToHtml: function(inAttributeHash) {
			var n, v, h = '';
			for (n in inAttributeHash) {
				v = inAttributeHash[n];
				if (v !== null && v !== false && v !== "") {
					h += ' ' + n + '="' + enyo.Control.escapeAttribute(v) + '"';
				}
			}
			return h;
		}
	}
});

enyo.defaultCtor = enyo.Control;

enyo.Control.subclass = function(ctor, props) {
	// Control classes may declare properties that are intended
	// to stack with superclass properties.
	//
	// We resort to prototype magic to assemble these properties
	// at kind declaration time, in the interest of efficiency
	// and ease of use.
	//
	// However, the properties are no longer 'live' in prototypes
	// because of this magic--i.e., changes to the prototype of
	// a Control subclass will not necessarily be reflected in
	// instances of that control (e.g., chained prototypes).
	//
	// These properties are also renamed to kind* to allow
	// combining with instance properties.
	//
	var proto = ctor.prototype;
	//
	// 'kindClasses' comes either from our inheritance chain (e.g., proto's prototype chain)
	// or has been forced by a kind declaration.
	//
	if (proto.classes) {
		var kc = proto.kindClasses;
		proto.kindClasses = (kc ? kc + " " : "") + proto.classes;
		proto.classes = "";
	}
	if (proto.style) {
		var ks = proto.kindStyle;
		proto.kindStyle = (ks ? ks + ";" : "") + proto.style;
		proto.style = "";
	}
	if (props.attributes) {
		var ka = proto.kindAttributes;
		proto.kindAttributes = enyo.mixin(enyo.clone(ka), proto.attributes);
		proto.attributes = null;
	}
};