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mainwindow.cpp Example File
mainwindows/menus/mainwindow.cpp

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 #include <QtGui>

 #include "mainwindow.h"

 MainWindow::MainWindow()
 {
     QWidget *widget = new QWidget;
     setCentralWidget(widget);

     QWidget *topFiller = new QWidget;
     topFiller->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);

     infoLabel = new QLabel(tr("<i>Choose a menu option, or right-click to "
                               "invoke a context menu</i>"));
     infoLabel->setFrameStyle(QFrame::StyledPanel | QFrame::Sunken);
     infoLabel->setAlignment(Qt::AlignCenter);

     QWidget *bottomFiller = new QWidget;
     bottomFiller->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);

     QVBoxLayout *layout = new QVBoxLayout;
     layout->setMargin(5);
     layout->addWidget(topFiller);
     layout->addWidget(infoLabel);
     layout->addWidget(bottomFiller);
     widget->setLayout(layout);

     createActions();
     createMenus();

     QString message = tr("A context menu is available by right-clicking");
     statusBar()->showMessage(message);

     setWindowTitle(tr("Menus"));
     setMinimumSize(160, 160);
     resize(480, 320);
 }

 void MainWindow::contextMenuEvent(QContextMenuEvent *event)
 {
     QMenu menu(this);
     menu.addAction(cutAct);
     menu.addAction(copyAct);
     menu.addAction(pasteAct);
     menu.exec(event->globalPos());
 }

 void MainWindow::newFile()
 {
     infoLabel->setText(tr("Invoked <b>File|New</b>"));
 }

 void MainWindow::open()
 {
     infoLabel->setText(tr("Invoked <b>File|Open</b>"));
 }

 void MainWindow::save()
 {
     infoLabel->setText(tr("Invoked <b>File|Save</b>"));
 }

 void MainWindow::print()
 {
     infoLabel->setText(tr("Invoked <b>File|Print</b>"));
 }

 void MainWindow::undo()
 {
     infoLabel->setText(tr("Invoked <b>Edit|Undo</b>"));
 }

 void MainWindow::redo()
 {
     infoLabel->setText(tr("Invoked <b>Edit|Redo</b>"));
 }

 void MainWindow::cut()
 {
     infoLabel->setText(tr("Invoked <b>Edit|Cut</b>"));
 }

 void MainWindow::copy()
 {
     infoLabel->setText(tr("Invoked <b>Edit|Copy</b>"));
 }

 void MainWindow::paste()
 {
     infoLabel->setText(tr("Invoked <b>Edit|Paste</b>"));
 }

 void MainWindow::bold()
 {
     infoLabel->setText(tr("Invoked <b>Edit|Format|Bold</b>"));
 }

 void MainWindow::italic()
 {
     infoLabel->setText(tr("Invoked <b>Edit|Format|Italic</b>"));
 }

 void MainWindow::leftAlign()
 {
     infoLabel->setText(tr("Invoked <b>Edit|Format|Left Align</b>"));
 }

 void MainWindow::rightAlign()
 {
     infoLabel->setText(tr("Invoked <b>Edit|Format|Right Align</b>"));
 }

 void MainWindow::justify()
 {
     infoLabel->setText(tr("Invoked <b>Edit|Format|Justify</b>"));
 }

 void MainWindow::center()
 {
     infoLabel->setText(tr("Invoked <b>Edit|Format|Center</b>"));
 }

 void MainWindow::setLineSpacing()
 {
     infoLabel->setText(tr("Invoked <b>Edit|Format|Set Line Spacing</b>"));
 }

 void MainWindow::setParagraphSpacing()
 {
     infoLabel->setText(tr("Invoked <b>Edit|Format|Set Paragraph Spacing</b>"));
 }

 void MainWindow::about()
 {
     infoLabel->setText(tr("Invoked <b>Help|About</b>"));
     QMessageBox::about(this, tr("About Menu"),
             tr("The <b>Menu</b> example shows how to create "
                "menu-bar menus and context menus."));
 }

 void MainWindow::aboutQt()
 {
     infoLabel->setText(tr("Invoked <b>Help|About Qt</b>"));
 }

 void MainWindow::createActions()
 {
     newAct = new QAction(tr("&New"), this);
     newAct->setShortcuts(QKeySequence::New);
     newAct->setStatusTip(tr("Create a new file"));
     connect(newAct, SIGNAL(triggered()), this, SLOT(newFile()));

     openAct = new QAction(tr("&Open..."), this);
     openAct->setShortcuts(QKeySequence::Open);
     openAct->setStatusTip(tr("Open an existing file"));
     connect(openAct, SIGNAL(triggered()), this, SLOT(open()));

     saveAct = new QAction(tr("&Save"), this);
     saveAct->setShortcuts(QKeySequence::Save);
     saveAct->setStatusTip(tr("Save the document to disk"));
     connect(saveAct, SIGNAL(triggered()), this, SLOT(save()));

     printAct = new QAction(tr("&Print..."), this);
     printAct->setShortcuts(QKeySequence::Print);
     printAct->setStatusTip(tr("Print the document"));
     connect(printAct, SIGNAL(triggered()), this, SLOT(print()));

     exitAct = new QAction(tr("E&xit"), this);
     exitAct->setShortcuts(QKeySequence::Quit);
     exitAct->setStatusTip(tr("Exit the application"));
     connect(exitAct, SIGNAL(triggered()), this, SLOT(close()));

     undoAct = new QAction(tr("&Undo"), this);
     undoAct->setShortcuts(QKeySequence::Undo);
     undoAct->setStatusTip(tr("Undo the last operation"));
     connect(undoAct, SIGNAL(triggered()), this, SLOT(undo()));

     redoAct = new QAction(tr("&Redo"), this);
     redoAct->setShortcuts(QKeySequence::Redo);
     redoAct->setStatusTip(tr("Redo the last operation"));
     connect(redoAct, SIGNAL(triggered()), this, SLOT(redo()));

     cutAct = new QAction(tr("Cu&t"), this);
     cutAct->setShortcuts(QKeySequence::Cut);
     cutAct->setStatusTip(tr("Cut the current selection's contents to the "
                             "clipboard"));
     connect(cutAct, SIGNAL(triggered()), this, SLOT(cut()));

     copyAct = new QAction(tr("&Copy"), this);
     copyAct->setShortcuts(QKeySequence::Copy);
     copyAct->setStatusTip(tr("Copy the current selection's contents to the "
                              "clipboard"));
     connect(copyAct, SIGNAL(triggered()), this, SLOT(copy()));

     pasteAct = new QAction(tr("&Paste"), this);
     pasteAct->setShortcuts(QKeySequence::Paste);
     pasteAct->setStatusTip(tr("Paste the clipboard's contents into the current "
                               "selection"));
     connect(pasteAct, SIGNAL(triggered()), this, SLOT(paste()));

     boldAct = new QAction(tr("&Bold"), this);
     boldAct->setCheckable(true);
     boldAct->setShortcut(QKeySequence::Bold);
     boldAct->setStatusTip(tr("Make the text bold"));
     connect(boldAct, SIGNAL(triggered()), this, SLOT(bold()));

     QFont boldFont = boldAct->font();
     boldFont.setBold(true);
     boldAct->setFont(boldFont);

     italicAct = new QAction(tr("&Italic"), this);
     italicAct->setCheckable(true);
     italicAct->setShortcut(QKeySequence::Italic);
     italicAct->setStatusTip(tr("Make the text italic"));
     connect(italicAct, SIGNAL(triggered()), this, SLOT(italic()));

     QFont italicFont = italicAct->font();
     italicFont.setItalic(true);
     italicAct->setFont(italicFont);

     setLineSpacingAct = new QAction(tr("Set &Line Spacing..."), this);
     setLineSpacingAct->setStatusTip(tr("Change the gap between the lines of a "
                                        "paragraph"));
     connect(setLineSpacingAct, SIGNAL(triggered()), this, SLOT(setLineSpacing()));

     setParagraphSpacingAct = new QAction(tr("Set &Paragraph Spacing..."), this);
     setLineSpacingAct->setStatusTip(tr("Change the gap between paragraphs"));
     connect(setParagraphSpacingAct, SIGNAL(triggered()),
             this, SLOT(setParagraphSpacing()));

     aboutAct = new QAction(tr("&About"), this);
     aboutAct->setStatusTip(tr("Show the application's About box"));
     connect(aboutAct, SIGNAL(triggered()), this, SLOT(about()));

     aboutQtAct = new QAction(tr("About &Qt"), this);
     aboutQtAct->setStatusTip(tr("Show the Qt library's About box"));
     connect(aboutQtAct, SIGNAL(triggered()), qApp, SLOT(aboutQt()));
     connect(aboutQtAct, SIGNAL(triggered()), this, SLOT(aboutQt()));

     leftAlignAct = new QAction(tr("&Left Align"), this);
     leftAlignAct->setCheckable(true);
     leftAlignAct->setShortcut(tr("Ctrl+L"));
     leftAlignAct->setStatusTip(tr("Left align the selected text"));
     connect(leftAlignAct, SIGNAL(triggered()), this, SLOT(leftAlign()));

     rightAlignAct = new QAction(tr("&Right Align"), this);
     rightAlignAct->setCheckable(true);
     rightAlignAct->setShortcut(tr("Ctrl+R"));
     rightAlignAct->setStatusTip(tr("Right align the selected text"));
     connect(rightAlignAct, SIGNAL(triggered()), this, SLOT(rightAlign()));

     justifyAct = new QAction(tr("&Justify"), this);
     justifyAct->setCheckable(true);
     justifyAct->setShortcut(tr("Ctrl+J"));
     justifyAct->setStatusTip(tr("Justify the selected text"));
     connect(justifyAct, SIGNAL(triggered()), this, SLOT(justify()));

     centerAct = new QAction(tr("&Center"), this);
     centerAct->setCheckable(true);
     centerAct->setShortcut(tr("Ctrl+E"));
     centerAct->setStatusTip(tr("Center the selected text"));
     connect(centerAct, SIGNAL(triggered()), this, SLOT(center()));

     alignmentGroup = new QActionGroup(this);
     alignmentGroup->addAction(leftAlignAct);
     alignmentGroup->addAction(rightAlignAct);
     alignmentGroup->addAction(justifyAct);
     alignmentGroup->addAction(centerAct);
     leftAlignAct->setChecked(true);
 }

 void MainWindow::createMenus()
 {
     fileMenu = menuBar()->addMenu(tr("&File"));
     fileMenu->addAction(newAct);
     fileMenu->addAction(openAct);
     fileMenu->addAction(saveAct);
     fileMenu->addAction(printAct);
     fileMenu->addSeparator();
     fileMenu->addAction(exitAct);

     editMenu = menuBar()->addMenu(tr("&Edit"));
     editMenu->addAction(undoAct);
     editMenu->addAction(redoAct);
     editMenu->addSeparator();
     editMenu->addAction(cutAct);
     editMenu->addAction(copyAct);
     editMenu->addAction(pasteAct);
     editMenu->addSeparator();

     helpMenu = menuBar()->addMenu(tr("&Help"));
     helpMenu->addAction(aboutAct);
     helpMenu->addAction(aboutQtAct);

     formatMenu = editMenu->addMenu(tr("&Format"));
     formatMenu->addAction(boldAct);
     formatMenu->addAction(italicAct);
     formatMenu->addSeparator()->setText(tr("Alignment"));
     formatMenu->addAction(leftAlignAct);
     formatMenu->addAction(rightAlignAct);
     formatMenu->addAction(justifyAct);
     formatMenu->addAction(centerAct);
     formatMenu->addSeparator();
     formatMenu->addAction(setLineSpacingAct);
     formatMenu->addAction(setParagraphSpacingAct);
 }


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Qt 4.6.3