src/gui/about_dialog/about_dialog_libmain.cc

// Copyright 2010-2015, Google Inc.
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#include <QtGui/QApplication>
#include <QtGui/QtGui>
#include "base/system_util.h"
#include "gui/about_dialog/about_dialog.h"
#include "gui/base/locale_util.h"
#include "gui/base/singleton_window_helper.h"

int RunAboutDialog(int argc, char *argv[]) {
  Q_INIT_RESOURCE(qrc_about_dialog);
  QApplication app(argc, argv);

  string name = "about_dialog.";
  name += mozc::SystemUtil::GetDesktopNameAsString();
  mozc::gui::SingletonWindowHelper window_helper(name);

  if (window_helper.FindPreviousWindow()) {
    // already running
    window_helper.ActivatePreviousWindow();
    return -1;
  }

  mozc::gui::LocaleUtil::InstallTranslationMessageAndFont("about_dialog");
  mozc::gui::AboutDialog about_dialog;

  about_dialog.show();
  about_dialog.raise();
  return app.exec();
}