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/* -*- Mode: c++; tab-width: 2; indent-tabs-mode: nil; -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at */
#ifndef nsAppShellSingleton_h__
#define nsAppShellSingleton_h__
* This file is designed to be included into the file that provides the
* nsIModule implementation for a particular widget toolkit.
* The following functions are defined:
* nsAppShellInit
* nsAppShellShutdown
* nsAppShellConstructor
* The nsAppShellInit function is designed to be used as a module constructor.
* If you already have a module constructor, then call nsAppShellInit from your
* module constructor.
* The nsAppShellShutdown function is designed to be used as a module
* destructor. If you already have a module destructor, then call
* nsAppShellShutdown from your module destructor.
* The nsAppShellConstructor function is designed to be used as a factory
* method for the nsAppShell class.
#include "nsXULAppAPI.h"
static nsIAppShell* sAppShell;
static nsresult nsAppShellInit() {
NS_ASSERTION(!sAppShell, "already initialized");
sAppShell = new nsAppShell();
if (!sAppShell) return NS_ERROR_OUT_OF_MEMORY;
nsresult rv = static_cast<nsAppShell*>(sAppShell)->Init();
// If we somehow failed to initialize the appshell, it's extremely likely
// that we are sufficiently hosed that continuing on is just going to lead
// to bad things later. By crashing early here, the crash report will
// potentially contain a little more insight into what's going wrong than
// if we waited for a crash further down the line. See also bug 1545381.
return NS_OK;
static void nsAppShellShutdown() { NS_RELEASE(sAppShell); }
nsresult nsAppShellConstructor(nsISupports* outer, const nsIID& iid,
void** result) {
return sAppShell->QueryInterface(iid, result);
#endif // nsAppShellSingleton_h__