Quelle nsAppShellSingleton.h Sprache: C

/* -*- 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 http://mozilla.org/MPL/2.0/. */

#ifndef nsAppShellSingleton_h__
#define nsAppShellSingleton_h__

/**
* This file is designed to be included into the file that provides the
* XPCOM module 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;
  NS_ADDREF(sAppShell);

  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.
  MOZ_RELEASE_ASSERT(NS_SUCCEEDED(rv));

  return NS_OK;
}

static void nsAppShellShutdown() { NS_RELEASE(sAppShell); }

nsresult nsAppShellConstructor(const nsIID& iid, void** result) {
  NS_ENSURE_TRUE(sAppShell, NS_ERROR_NOT_INITIALIZED);

  return sAppShell->QueryInterface(iid, result);
}

#endif  // nsAppShellSingleton_h__

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