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void MainWindow::createMenus()
{
fileMenu = menuBar()->addMenu(tr("&File"));
fileMenu->addAction(newAct);
fileMenu->addAction(openAct);
fileMenu->addAction(saveAct);
fileMenu->addAction(saveAsAct);
fileMenu->addSeparator();
QAction *action = fileMenu->addAction(tr("Switch layout direction"));
connect(action,SIGNAL(triggered()),this,SLOT(switchLayoutDirection()));
fileMenu->addAction(exitAct);
editMenu = menuBar()->addMenu(tr("&Edit"));
editMenu->addAction(cutAct);
editMenu->addAction(copyAct);
editMenu->addAction(pasteAct);
windowMenu = menuBar()->addMenu(tr("&Window"));
updateWindowMenu();
connect(windowMenu,SIGNAL(aboutToShow()),this,SLOT(updateWindowMenu()));
menuBar()->addSeparator();
helpMenu = menuBar()->addMenu(tr("&Help"));
helpMenu->addAction(aboutAct);
helpMenu->addAction(aboutQtAct);
}