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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);
 }


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Qt 4.3.5