/*
	Copyright (c) 2004-2011, The Dojo Foundation All Rights Reserved.
	Available via Academic Free License >= 2.1 OR the modified BSD license.
	see: http://dojotoolkit.org/license for details
*/


if(!dojo._hasResource["dijit.layout._ContentPaneResizeMixin"]){ //_hasResource checks added by build. Do not use _hasResource directly in your code.
dojo._hasResource["dijit.layout._ContentPaneResizeMixin"] = true;
dojo.provide("dijit.layout._ContentPaneResizeMixin");
dojo.require("dijit._Contained");



dojo.declare("dijit.layout._ContentPaneResizeMixin", null, {
	// summary:
	//		Resize() functionality of ContentPane.   If there's a single layout widget
	//		child then it will call resize() with the same dimensions as the ContentPane.
	//		Otherwise just calls resize on each child.
	//
	//		Also implements basic startup() functionality, where starting the parent
	//		will start the children

	// doLayout: Boolean
	//		- false - don't adjust size of children
	//		- true - if there is a single visible child widget, set it's size to
	//				however big the ContentPane is
	doLayout: true,

	// isContainer: [protected] Boolean
	//		Indicates that this widget acts as a "parent" to the descendant widgets.
	//		When the parent is started it will call startup() on the child widgets.
	//		See also `isLayoutContainer`.
	isContainer: true,

	// isLayoutContainer: [protected] Boolean
	//		Indicates that this widget will call resize() on it's child widgets
	//		when they become visible.
	isLayoutContainer: true,

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

		// This starts all the widgets
		dojo.forEach(this.getChildren(), function(child){
			child.startup();
			child._started = true;
		});
	},

	startup: function(){
		// summary:
		//		See `dijit.layout._LayoutWidget.startup` for description.
		//		Although ContentPane doesn't extend _LayoutWidget, it does implement
		//		the same API.

		if(this._started){ return; }

		var parent = dijit._Contained.prototype.getParent.call(this);
		this._childOfLayoutWidget = parent && parent.isLayoutContainer;

		// I need to call resize() on my child/children (when I become visible), unless
		// I'm the child of a layout widget in which case my parent will call resize() on me and I'll do it then.
		this._needLayout = !this._childOfLayoutWidget;

		this.inherited(arguments);

		this._startChildren();
	},

	_checkIfSingleChild: function(){
		// summary:
		//		Test if we have exactly one visible widget as a child,
		//		and if so assume that we are a container for that widget,
		//		and should propagate startup() and resize() calls to it.
		//		Skips over things like data stores since they aren't visible.

		var childNodes = dojo.query("> *", this.containerNode).filter(function(node){
				return node.tagName !== "SCRIPT"; // or a regexp for hidden elements like script|area|map|etc..
			}),
			childWidgetNodes = childNodes.filter(function(node){
				return dojo.hasAttr(node, "data-dojo-type") || dojo.hasAttr(node, "dojoType") || dojo.hasAttr(node, "widgetId");
			}),
			candidateWidgets = dojo.filter(childWidgetNodes.map(dijit.byNode), function(widget){
				return widget && widget.domNode && widget.resize;
			});

		if(
			// all child nodes are widgets
			childNodes.length == childWidgetNodes.length &&

			// all but one are invisible (like dojo.data)
			candidateWidgets.length == 1
		){
			this._singleChild = candidateWidgets[0];
		}else{
			delete this._singleChild;
		}

		// So we can set overflow: hidden to avoid a safari bug w/scrollbars showing up (#9449)
		dojo.toggleClass(this.containerNode, this.baseClass + "SingleChild", !!this._singleChild);
	},

	resize: function(changeSize, resultSize){
		// summary:
		//		See `dijit.layout._LayoutWidget.resize` for description.
		//		Although ContentPane doesn't extend _LayoutWidget, it does implement
		//		the same API.
		this._layout(changeSize, resultSize);
	},

	_layout: function(changeSize, resultSize){
		// summary:
		//		Resize myself according to optional changeSize/resultSize parameters, like a layout widget.
		//		Also, since I am a Container widget, each of my children expects me to
		//		call resize() or layout() on them.
		//
		//		Should be called on initialization and also whenever we get new content
		//		(from an href, or from set('content', ...))... but deferred until
		//		the ContentPane is visible

		// Set margin box size, unless it wasn't specified, in which case use current size.
		if(changeSize){
			dojo.marginBox(this.domNode, changeSize);
		}

		// Compute content box size of containerNode in case we [later] need to size our single child.
		var cn = this.containerNode;
		if(cn === this.domNode){
			// If changeSize or resultSize was passed to this method and this.containerNode ==
			// this.domNode then we can compute the content-box size without querying the node,
			// which is more reliable (similar to LayoutWidget.resize) (see for example #9449).
			var mb = resultSize || {};
			dojo.mixin(mb, changeSize || {}); // changeSize overrides resultSize
			if(!("h" in mb) || !("w" in mb)){
				mb = dojo.mixin(dojo.marginBox(cn), mb); // just use dojo.marginBox() to fill in missing values
			}
			this._contentBox = dijit.layout.marginBox2contentBox(cn, mb);
		}else{
			this._contentBox = dojo.contentBox(cn);
		}

		this._layoutChildren();

		delete this._needLayout;
	},
	
	_layoutChildren: function(){
		// Call _checkIfSingleChild() again in case app has manually mucked w/the content
		// of the ContentPane (rather than changing it through the set("content", ...) API.
		if(this.doLayout){
			this._checkIfSingleChild();
		}

		if(this._singleChild && this._singleChild.resize){
			var cb = this._contentBox || dojo.contentBox(this.containerNode);

			// note: if widget has padding this._contentBox will have l and t set,
			// but don't pass them to resize() or it will doubly-offset the child
			this._singleChild.resize({w: cb.w, h: cb.h});
		}else{
			// All my child widgets are independently sized (rather than matching my size),
			// but I still need to call resize() on each child to make it layout.
			dojo.forEach(this.getChildren(), function(widget){
				if(widget.resize){
					widget.resize();
				}
			});
		}
	}
});

}