dojo.provide("dojo._base.window");

/*=====
dojo.doc = {
	// summary:
	//		Alias for the current document. 'dojo.doc' can be modified
	//		for temporary context shifting. Also see dojo.withDoc().
	// description:
	//    Refer to dojo.doc rather
	//    than referring to 'window.document' to ensure your code runs
	//    correctly in managed contexts.
	// example:
	// 	|	n.appendChild(dojo.doc.createElement('div'));
}
=====*/
dojo.doc = window["document"] || null;

dojo.body = function(){
	// summary:
	//		Return the body element of the document
	//		return the body object associated with dojo.doc
	// example:
	// 	|	dojo.body().appendChild(dojo.doc.createElement('div'));

	// Note: document.body is not defined for a strict xhtml document
	// Would like to memoize this, but dojo.doc can change vi dojo.withDoc().
	return dojo.doc.body || dojo.doc.getElementsByTagName("body")[0]; // Node
}

dojo.setContext = function(/*Object*/globalObject, /*DocumentElement*/globalDocument){
	// summary:
	//		changes the behavior of many core Dojo functions that deal with
	//		namespace and DOM lookup, changing them to work in a new global
	//		context (e.g., an iframe). The varibles dojo.global and dojo.doc
	//		are modified as a result of calling this function and the result of
	//		`dojo.body()` likewise differs.
	dojo.global = globalObject;
	dojo.doc = globalDocument;
};

dojo.withGlobal = function(	/*Object*/globalObject, 
							/*Function*/callback, 
							/*Object?*/thisObject, 
							/*Array?*/cbArguments){
	// summary:
	//		Invoke callback with globalObject as dojo.global and
	//		globalObject.document as dojo.doc.
	// description:
	//		Invoke callback with globalObject as dojo.global and
	//		globalObject.document as dojo.doc. If provided, globalObject
	//		will be executed in the context of object thisObject
	//		When callback() returns or throws an error, the dojo.global
	//		and dojo.doc will be restored to its previous state.

	var oldGlob = dojo.global;
	try{
		dojo.global = globalObject;
		return dojo.withDoc.call(null, globalObject.document, callback, thisObject, cbArguments);
	}finally{
		dojo.global = oldGlob;
	}
}

dojo.withDoc = function(	/*DocumentElement*/documentObject, 
							/*Function*/callback, 
							/*Object?*/thisObject, 
							/*Array?*/cbArguments){
	// summary:
	//		Invoke callback with documentObject as dojo.doc.
	// description:
	//		Invoke callback with documentObject as dojo.doc. If provided,
	//		callback will be executed in the context of object thisObject
	//		When callback() returns or throws an error, the dojo.doc will
	//		be restored to its previous state.

	var oldDoc = dojo.doc,
		oldLtr = dojo._bodyLtr;

	try{
		dojo.doc = documentObject;
		delete dojo._bodyLtr; // uncache

		if(thisObject && dojo.isString(callback)){
			callback = thisObject[callback];
		}

		return callback.apply(thisObject, cbArguments || []);
	}finally{
		dojo.doc = oldDoc;
		if(oldLtr !== undefined){ dojo._bodyLtr = oldLtr; }
	}
};
	