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Файл примера mainwindow.cpp
linguist/arrowpad/mainwindow.cpp

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 #include <QtGui>

 #include "arrowpad.h"
 #include "mainwindow.h"

 MainWindow::MainWindow()
 {
     arrowPad = new ArrowPad;
     setCentralWidget(arrowPad);

     exitAct = new QAction(tr("E&xit"), this);
     exitAct->setShortcut(tr("Ctrl+Q"));
     connect(exitAct, SIGNAL(triggered()), this, SLOT(close()));

     fileMenu = menuBar()->addMenu(tr("&File"));
     fileMenu->addAction(exitAct);
 }