mainwindow.cpp Example File

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  #include <QtWidgets>

  #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);
  }

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

  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, &QAction::triggered, this, &MainWindow::newFile);

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

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

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

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

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

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

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

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

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

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

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

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