define("dijit/layout/ContentPane", [
	"dojo/_base/kernel", // kernel.deprecated
	"dojo/_base/lang", // lang.mixin lang.delegate lang.hitch lang.isFunction lang.isObject
	"../_Widget",
	"../_Container",
	"./_ContentPaneResizeMixin",
	"dojo/string", // string.substitute
	"dojo/html", // html._ContentSetter
	"dojo/i18n!../nls/loading",
	"dojo/_base/array", // array.forEach
	"dojo/_base/declare", // declare
	"dojo/_base/Deferred", // Deferred
	"dojo/dom", // dom.byId
	"dojo/dom-attr", // domAttr.attr
	"dojo/dom-construct", // empty()
	"dojo/_base/xhr", // xhr.get
	"dojo/i18n", // i18n.getLocalization
	"dojo/when"
], function(kernel, lang, _Widget, _Container, _ContentPaneResizeMixin, string, html, nlsLoading,
	array, declare, Deferred, dom, domAttr, domConstruct, xhr, i18n, when){

// module:
//		dijit/layout/ContentPane


return declare("dijit.layout.ContentPane", [_Widget, _Container, _ContentPaneResizeMixin], {
	// summary:
	//		A widget containing an HTML fragment, specified inline
	//		or by uri.  Fragment may include widgets.
	//
	// description:
	//		This widget embeds a document fragment in the page, specified
	//		either by uri, javascript generated markup or DOM reference.
	//		Any widgets within this content are instantiated and managed,
	//		but laid out according to the HTML structure.  Unlike IFRAME,
	//		ContentPane embeds a document fragment as would be found
	//		inside the BODY tag of a full HTML document.  It should not
	//		contain the HTML, HEAD, or BODY tags.
	//		For more advanced functionality with scripts and
	//		stylesheets, see dojox/layout/ContentPane.  This widget may be
	//		used stand alone or as a base class for other widgets.
	//		ContentPane is useful as a child of other layout containers
	//		such as BorderContainer or TabContainer, but note that those
	//		widgets can contain any widget as a child.
	//
	// example:
	//		Some quick samples:
	//		To change the innerHTML:
	// |		cp.set('content', '<b>new content</b>')`
	//		Or you can send it a NodeList:
	// |		cp.set('content', dojo.query('div [class=selected]', userSelection))
	//		To do an ajax update:
	// |		cp.set('href', url)

	// href: String
	//		The href of the content that displays now.
	//		Set this at construction if you want to load data externally when the
	//		pane is shown.  (Set preload=true to load it immediately.)
	//		Changing href after creation doesn't have any effect; Use set('href', ...);
	href: "",

	// content: String|DomNode|NodeList|dijit/_Widget
	//		The innerHTML of the ContentPane.
	//		Note that the initialization parameter / argument to set("content", ...)
	//		can be a String, DomNode, Nodelist, or _Widget.
	content: "",

	// extractContent: Boolean
	//		Extract visible content from inside of `<body> .... </body>`.
	//		I.e., strip `<html>` and `<head>` (and it's contents) from the href
	extractContent: false,

	// parseOnLoad: Boolean
	//		Parse content and create the widgets, if any.
	parseOnLoad: true,

	// parserScope: String
	//		Flag passed to parser.  Root for attribute names to search for.   If scopeName is dojo,
	//		will search for data-dojo-type (or dojoType).  For backwards compatibility
	//		reasons defaults to dojo._scopeName (which is "dojo" except when
	//		multi-version support is used, when it will be something like dojo16, dojo20, etc.)
	parserScope: kernel._scopeName,

	// preventCache: Boolean
	//		Prevent caching of data from href's by appending a timestamp to the href.
	preventCache: false,

	// preload: Boolean
	//		Force load of data on initialization even if pane is hidden.
	preload: false,

	// refreshOnShow: Boolean
	//		Refresh (re-download) content when pane goes from hidden to shown
	refreshOnShow: false,

	// loadingMessage: String
	//		Message that shows while downloading
	loadingMessage: "<span class='dijitContentPaneLoading'><span class='dijitInline dijitIconLoading'></span>${loadingState}</span>",

	// errorMessage: String
	//		Message that shows if an error occurs
	errorMessage: "<span class='dijitContentPaneError'><span class='dijitInline dijitIconError'></span>${errorState}</span>",

	// isLoaded: [readonly] Boolean
	//		True if the ContentPane has data in it, either specified
	//		during initialization (via href or inline content), or set
	//		via set('content', ...) / set('href', ...)
	//
	//		False if it doesn't have any content, or if ContentPane is
	//		still in the process of downloading href.
	isLoaded: false,

	baseClass: "dijitContentPane",

	/*======
	// ioMethod: dojo/_base/xhr.get|dojo._base/xhr.post
	//		Function that should grab the content specified via href.
	ioMethod: dojo.xhrGet,
	======*/

	// ioArgs: Object
	//		Parameters to pass to xhrGet() request, for example:
	// |	<div data-dojo-type="dijit/layout/ContentPane" data-dojo-props="href: './bar', ioArgs: {timeout: 500}">
	ioArgs: {},

	// onLoadDeferred: [readonly] dojo.Deferred
	//		This is the `dojo.Deferred` returned by set('href', ...) and refresh().
	//		Calling onLoadDeferred.then() registers your
	//		callback to be called only once, when the prior set('href', ...) call or
	//		the initial href parameter to the constructor finishes loading.
	//
	//		This is different than an onLoad() handler which gets called any time any href
	//		or content is loaded.
	onLoadDeferred: null,

	// Cancel _WidgetBase's _setTitleAttr because we don't want the title attribute (used to specify
	// tab labels) to be copied to ContentPane.domNode... otherwise a tooltip shows up over the
	// entire pane.
	_setTitleAttr: null,

	// Flag to parser that I'll parse my contents, so it shouldn't.
	stopParser: true,

	// template: [private] Boolean
	//		Flag from the parser that this ContentPane is inside a template
	//		so the contents are pre-parsed.
	// TODO: this declaration can be commented out in 2.0
	template: false,

	create: function(params, srcNodeRef){
		// Convert a srcNodeRef argument into a content parameter, so that the original contents are
		// processed in the same way as contents set via set("content", ...), calling the parser etc.
		// Avoid modifying original params object since that breaks NodeList instantiation, see #11906.
		if((!params || !params.template) && srcNodeRef && !("href" in params) && !("content" in params)){
			srcNodeRef = dom.byId(srcNodeRef);
			var df = srcNodeRef.ownerDocument.createDocumentFragment();
			while(srcNodeRef.firstChild){
				df.appendChild(srcNodeRef.firstChild);
			}
			params = lang.delegate(params, {content: df});
		}
		this.inherited(arguments, [params, srcNodeRef]);
	},

	postMixInProperties: function(){
		this.inherited(arguments);
		var messages = i18n.getLocalization("dijit", "loading", this.lang);
		this.loadingMessage = string.substitute(this.loadingMessage, messages);
		this.errorMessage = string.substitute(this.errorMessage, messages);
	},

	buildRendering: function(){
		this.inherited(arguments);

		// Since we have no template we need to set this.containerNode ourselves, to make getChildren() work.
		// For subclasses of ContentPane that do have a template, does nothing.
		if(!this.containerNode){
			this.containerNode = this.domNode;
		}

		// remove the title attribute so it doesn't show up when hovering
		// over a node  (TODO: remove in 2.0, no longer needed after #11490)
		this.domNode.title = "";

		if(!domAttr.get(this.domNode,"role")){
			this.domNode.setAttribute("role", "group");
		}
	},

	startup: function(){
		// summary:
		//		Call startup() on all children including non _Widget ones like dojo/dnd/Source objects

		// This starts all the widgets
		this.inherited(arguments);

		// And this catches stuff like dojo/dnd/Source
		if(this._contentSetter){
			array.forEach(this._contentSetter.parseResults, function(obj){
				if(!obj._started && !obj._destroyed && lang.isFunction(obj.startup)){
					obj.startup();
					obj._started = true;
				}
			}, this);
		}
	},

	_startChildren: function(){
		// summary:
		//		Called when content is loaded.   Calls startup on each child widget.   Similar to ContentPane.startup()
		//		itself, but avoids marking the ContentPane itself as "restarted" (see #15581).

		// This starts all the widgets
		array.forEach(this.getChildren(), function(obj){
			if(!obj._started && !obj._destroyed && lang.isFunction(obj.startup)){
				obj.startup();
				obj._started = true;
			}
		});

		// And this catches stuff like dojo/dnd/Source
		if(this._contentSetter){
			array.forEach(this._contentSetter.parseResults, function(obj){
				if(!obj._started && !obj._destroyed && lang.isFunction(obj.startup)){
					obj.startup();
					obj._started = true;
				}
			}, this);
		}
	},

	setHref: function(/*String|Uri*/ href){
		// summary:
		//		Deprecated.   Use set('href', ...) instead.
		kernel.deprecated("dijit.layout.ContentPane.setHref() is deprecated. Use set('href', ...) instead.", "", "2.0");
		return this.set("href", href);
	},
	_setHrefAttr: function(/*String|Uri*/ href){
		// summary:
		//		Hook so set("href", ...) works.
		// description:
		//		Reset the (external defined) content of this pane and replace with new url
		//		Note: It delays the download until widget is shown if preload is false.
		// href:
		//		url to the page you want to get, must be within the same domain as your mainpage

		// Cancel any in-flight requests (a set('href', ...) will cancel any in-flight set('href', ...))
		this.cancel();

		this.onLoadDeferred = new Deferred(lang.hitch(this, "cancel"));
		this.onLoadDeferred.then(lang.hitch(this, "onLoad"));

		this._set("href", href);

		// _setHrefAttr() is called during creation and by the user, after creation.
		// Assuming preload == false, only in the second case do we actually load the URL;
		// otherwise it's done in startup(), and only if this widget is shown.
		if(this.preload || (this._created && this._isShown())){
			this._load();
		}else{
			// Set flag to indicate that href needs to be loaded the next time the
			// ContentPane is made visible
			this._hrefChanged = true;
		}

		return this.onLoadDeferred;		// Deferred
	},

	setContent: function(/*String|DomNode|Nodelist*/data){
		// summary:
		//		Deprecated.   Use set('content', ...) instead.
		kernel.deprecated("dijit.layout.ContentPane.setContent() is deprecated.  Use set('content', ...) instead.", "", "2.0");
		this.set("content", data);
	},
	_setContentAttr: function(/*String|DomNode|Nodelist*/data){
		// summary:
		//		Hook to make set("content", ...) work.
		//		Replaces old content with data content, include style classes from old content
		// data:
		//		the new Content may be String, DomNode or NodeList
		//
		//		if data is a NodeList (or an array of nodes) nodes are copied
		//		so you can import nodes from another document implicitly

		// clear href so we can't run refresh and clear content
		// refresh should only work if we downloaded the content
		this._set("href", "");

		// Cancel any in-flight requests (a set('content', ...) will cancel any in-flight set('href', ...))
		this.cancel();

		// Even though user is just setting content directly, still need to define an onLoadDeferred
		// because the _onLoadHandler() handler is still getting called from setContent()
		this.onLoadDeferred = new Deferred(lang.hitch(this, "cancel"));
		if(this._created){
			// For back-compat reasons, call onLoad() for set('content', ...)
			// calls but not for content specified in srcNodeRef (ie: <div data-dojo-type=ContentPane>...</div>)
			// or as initialization parameter (ie: new ContentPane({content: ...})
			this.onLoadDeferred.then(lang.hitch(this, "onLoad"));
		}

		this._setContent(data || "");

		this._isDownloaded = false; // mark that content is from a set('content') not a set('href')

		return this.onLoadDeferred;	// Deferred
	},
	_getContentAttr: function(){
		// summary:
		//		Hook to make get("content") work
		return this.containerNode.innerHTML;
	},

	cancel: function(){
		// summary:
		//		Cancels an in-flight download of content
		if(this._xhrDfd && (this._xhrDfd.fired == -1)){
			this._xhrDfd.cancel();
		}
		delete this._xhrDfd; // garbage collect

		this.onLoadDeferred = null;
	},

	destroy: function(){
		this.cancel();
		this.inherited(arguments);
	},

	destroyRecursive: function(/*Boolean*/ preserveDom){
		// summary:
		//		Destroy the ContentPane and its contents

		// if we have multiple controllers destroying us, bail after the first
		if(this._beingDestroyed){
			return;
		}
		this.inherited(arguments);
	},

	_onShow: function(){
		// summary:
		//		Called when the ContentPane is made visible
		// description:
		//		For a plain ContentPane, this is called on initialization, from startup().
		//		If the ContentPane is a hidden pane of a TabContainer etc., then it's
		//		called whenever the pane is made visible.
		//
		//		Does necessary processing, including href download and layout/resize of
		//		child widget(s)

		this.inherited(arguments);

		if(this.href){
			if(!this._xhrDfd && // if there's an href that isn't already being loaded
				(!this.isLoaded || this._hrefChanged || this.refreshOnShow)
			){
				return this.refresh();	// If child has an href, promise that fires when the load is complete
			}
		}
	},

	refresh: function(){
		// summary:
		//		[Re]download contents of href and display
		// description:
		//		1. cancels any currently in-flight requests
		//		2. posts "loading..." message
		//		3. sends XHR to download new data

		// Cancel possible prior in-flight request
		this.cancel();

		this.onLoadDeferred = new Deferred(lang.hitch(this, "cancel"));
		this.onLoadDeferred.then(lang.hitch(this, "onLoad"));
		this._load();
		return this.onLoadDeferred;		// If child has an href, promise that fires when refresh is complete
	},

	_load: function(){
		// summary:
		//		Load/reload the href specified in this.href

		// display loading message
		this._setContent(this.onDownloadStart(), true);

		var self = this;
		var getArgs = {
			preventCache: (this.preventCache || this.refreshOnShow),
			url: this.href,
			handleAs: "text"
		};
		if(lang.isObject(this.ioArgs)){
			lang.mixin(getArgs, this.ioArgs);
		}

		var hand = (this._xhrDfd = (this.ioMethod || xhr.get)(getArgs)),
			returnedHtml;

		hand.then(
			function(html){
				returnedHtml = html;
				try{
					self._isDownloaded = true;
					return self._setContent(html, false);
				}catch(err){
					self._onError('Content', err); // onContentError
				}
			},
			function(err){
				if(!hand.canceled){
					// show error message in the pane
					self._onError('Download', err); // onDownloadError
				}
				delete self._xhrDfd;
				return err;
			}
		).then(function(){
			self.onDownloadEnd();
			delete self._xhrDfd;
			return returnedHtml;
		});

		// Remove flag saying that a load is needed
		delete this._hrefChanged;
	},

	_onLoadHandler: function(data){
		// summary:
		//		This is called whenever new content is being loaded
		this._set("isLoaded", true);
		try{
			this.onLoadDeferred.resolve(data);
		}catch(e){
			console.error('Error '+this.widgetId+' running custom onLoad code: ' + e.message);
		}
	},

	_onUnloadHandler: function(){
		// summary:
		//		This is called whenever the content is being unloaded
		this._set("isLoaded", false);
		try{
			this.onUnload();
		}catch(e){
			console.error('Error '+this.widgetId+' running custom onUnload code: ' + e.message);
		}
	},

	destroyDescendants: function(/*Boolean*/ preserveDom){
		// summary:
		//		Destroy all the widgets inside the ContentPane and empty containerNode

		// Make sure we call onUnload (but only when the ContentPane has real content)
		if(this.isLoaded){
			this._onUnloadHandler();
		}

		// Even if this.isLoaded == false there might still be a "Loading..." message
		// to erase, so continue...

		// For historical reasons we need to delete all widgets under this.containerNode,
		// even ones that the user has created manually.
		var setter = this._contentSetter;
		array.forEach(this.getChildren(), function(widget){
			if(widget.destroyRecursive){
				// All widgets will hit this branch
				widget.destroyRecursive(preserveDom);
			}else if(widget.destroy){
				// Things like dojo/dnd/Source have destroy(), not destroyRecursive()
				widget.destroy(preserveDom);
			}
			widget._destroyed = true;
		});
		if(setter){
			// Most of the widgets in setter.parseResults have already been destroyed, but
			// things like Menu that have been moved to <body> haven't yet
			array.forEach(setter.parseResults, function(widget){
				if(!widget._destroyed){
					if(widget.destroyRecursive){
						// All widgets will hit this branch
						widget.destroyRecursive(preserveDom);
					}else if(widget.destroy){
						// Things like dojo/dnd/Source have destroy(), not destroyRecursive()
						widget.destroy(preserveDom);
					}
					widget._destroyed = true;
				}
			});
			delete setter.parseResults;
		}

		// And then clear away all the DOM nodes
		if(!preserveDom){
			domConstruct.empty(this.containerNode);
		}

		// Delete any state information we have about current contents
		delete this._singleChild;
	},

	_setContent: function(/*String|DocumentFragment*/ cont, /*Boolean*/ isFakeContent){
		// summary:
		//		Insert the content into the container node
		// returns:
		//		Returns a Deferred promise that is resolved when the content is parsed.

		// first get rid of child widgets
		this.destroyDescendants();

		// html.set will take care of the rest of the details
		// we provide an override for the error handling to ensure the widget gets the errors
		// configure the setter instance with only the relevant widget instance properties
		// NOTE: unless we hook into attr, or provide property setters for each property,
		// we need to re-configure the ContentSetter with each use
		var setter = this._contentSetter;
		if(! (setter && setter instanceof html._ContentSetter)){
			setter = this._contentSetter = new html._ContentSetter({
				node: this.containerNode,
				_onError: lang.hitch(this, this._onError),
				onContentError: lang.hitch(this, function(e){
					// fires if a domfault occurs when we are appending this.errorMessage
					// like for instance if domNode is a UL and we try append a DIV
					var errMess = this.onContentError(e);
					try{
						this.containerNode.innerHTML = errMess;
					}catch(e){
						console.error('Fatal '+this.id+' could not change content due to '+e.message, e);
					}
				})/*,
				_onError */
			});
		}

		var setterParams = lang.mixin({
			cleanContent: this.cleanContent,
			extractContent: this.extractContent,
			parseContent: !cont.domNode && this.parseOnLoad,
			parserScope: this.parserScope,
			startup: false,
			dir: this.dir,
			lang: this.lang,
			textDir: this.textDir
		}, this._contentSetterParams || {});

		var p = setter.set( (lang.isObject(cont) && cont.domNode) ? cont.domNode : cont, setterParams );

		// dojox/layout/html/_base::_ContentSetter.set() returns a Promise that indicates when everything is completed.
		// dojo/html::_ContentSetter.set() currently returns the DOMNode, but that will be changed for 2.0.
		// So, if set() returns a promise then use it, otherwise fallback to waiting on setter.parseDeferred
		var self = this;
		return when(p && p.then ? p : setter.parseDeferred, function(){
			// setter params must be pulled afresh from the ContentPane each time
			delete self._contentSetterParams;
			
			if(!isFakeContent){
				if(self._started){
					// Startup each top level child widget (and they will start their children, recursively)
					self._startChildren();
					
					// Call resize() on each of my child layout widgets,
					// or resize() on my single child layout widget...
					// either now (if I'm currently visible) or when I become visible
					self._scheduleLayout();
				}
				self._onLoadHandler(cont);
			}
		});
	},

	_onError: function(type, err, consoleText){
		this.onLoadDeferred.reject(err);

		// shows user the string that is returned by on[type]Error
		// override on[type]Error and return your own string to customize
		var errText = this['on' + type + 'Error'].call(this, err);
		if(consoleText){
			console.error(consoleText, err);
		}else if(errText){// a empty string won't change current content
			this._setContent(errText, true);
		}
	},

	// EVENT's, should be overide-able
	onLoad: function(/*===== data =====*/){
		// summary:
		//		Event hook, is called after everything is loaded and widgetified
		// tags:
		//		callback
	},

	onUnload: function(){
		// summary:
		//		Event hook, is called before old content is cleared
		// tags:
		//		callback
	},

	onDownloadStart: function(){
		// summary:
		//		Called before download starts.
		// description:
		//		The string returned by this function will be the html
		//		that tells the user we are loading something.
		//		Override with your own function if you want to change text.
		// tags:
		//		extension
		return this.loadingMessage;
	},

	onContentError: function(/*Error*/ /*===== error =====*/){
		// summary:
		//		Called on DOM faults, require faults etc. in content.
		//
		//		In order to display an error message in the pane, return
		//		the error message from this method, as an HTML string.
		//
		//		By default (if this method is not overriden), it returns
		//		nothing, so the error message is just printed to the console.
		// tags:
		//		extension
	},

	onDownloadError: function(/*Error*/ /*===== error =====*/){
		// summary:
		//		Called when download error occurs.
		//
		//		In order to display an error message in the pane, return
		//		the error message from this method, as an HTML string.
		//
		//		Default behavior (if this method is not overriden) is to display
		//		the error message inside the pane.
		// tags:
		//		extension
		return this.errorMessage;
	},

	onDownloadEnd: function(){
		// summary:
		//		Called when download is finished.
		// tags:
		//		callback
	}
});

});
