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# mainwindow.cpp Example File
tools/i18n/mainwindow.cpp

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     #include <QtGui>

     #include "mainwindow.h"

     static const char * const listEntries[] = {
         QT_TRANSLATE_NOOP("MainWindow", "First"),
         QT_TRANSLATE_NOOP("MainWindow", "Second"),
         QT_TRANSLATE_NOOP("MainWindow", "Third"),
         0
     };

     MainWindow::MainWindow()
     {
         centralWidget = new QWidget;
         setCentralWidget(centralWidget);

         createGroupBox();

         listWidget = new QListWidget;
         for (int i = 0; listEntries[i]; ++i)
             listWidget->addItem(tr(listEntries[i]));

         QVBoxLayout *mainLayout = new QVBoxLayout;
         mainLayout->addWidget(groupBox);
         mainLayout->addWidget(listWidget);
         centralWidget->setLayout(mainLayout);

         exitAction = new QAction(tr("E&xit"), this);
         connect(exitAction, SIGNAL(triggered()), qApp, SLOT(quit()));

         fileMenu = menuBar()->addMenu(tr("&File"));
         fileMenu->setPalette(QPalette(Qt::red));
         fileMenu->addAction(exitAction);

         setWindowTitle(tr("Language: %1").arg(tr("English")));
         statusBar()->showMessage(tr("Internationalization Example"));

         if (tr("LTR") == "RTL")
             setLayoutDirection(Qt::RightToLeft);
     }

     void MainWindow::createGroupBox()
     {
         groupBox = new QGroupBox(tr("View"));
         perspectiveRadioButton = new QRadioButton(tr("Perspective"));
         isometricRadioButton = new QRadioButton(tr("Isometric"));
         obliqueRadioButton = new QRadioButton(tr("Oblique"));
         perspectiveRadioButton->setChecked(true);

         QVBoxLayout *groupBoxLayout = new QVBoxLayout;
         groupBoxLayout->addWidget(perspectiveRadioButton);
         groupBoxLayout->addWidget(isometricRadioButton);
         groupBoxLayout->addWidget(obliqueRadioButton);
         groupBox->setLayout(groupBoxLayout);
     }