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

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        ** This file is part of the documentation of the Qt Toolkit.
        **
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    ** GNU General Public License version 2 as published by the Free Software
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    ** packaging of this file.
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        #include <QtGui>

        #include "mainwindow.h"

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

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

            createActions();
            createMenus();

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

            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->setShortcut(tr("Ctrl+N"));
            newAct->setStatusTip(tr("Create a new file"));
            connect(newAct, SIGNAL(triggered()), this, SLOT(newFile()));

            openAct = new QAction(tr("&Open..."), this);
            openAct->setShortcut(tr("Ctrl+O"));
            openAct->setStatusTip(tr("Open an existing file"));
            connect(openAct, SIGNAL(triggered()), this, SLOT(open()));

            saveAct = new QAction(tr("&Save"), this);
            saveAct->setShortcut(tr("Ctrl+S"));
            saveAct->setStatusTip(tr("Save the document to disk"));
            connect(saveAct, SIGNAL(triggered()), this, SLOT(save()));

            printAct = new QAction(tr("&Print..."), this);
            printAct->setShortcut(tr("Ctrl+P"));
            printAct->setStatusTip(tr("Print the document"));
            connect(printAct, SIGNAL(triggered()), this, SLOT(print()));

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

            undoAct = new QAction(tr("&Undo"), this);
            undoAct->setShortcut(tr("Ctrl+Z"));
            undoAct->setStatusTip(tr("Undo the last operation"));
            connect(undoAct, SIGNAL(triggered()), this, SLOT(undo()));

            redoAct = new QAction(tr("&Redo"), this);
            redoAct->setShortcut(tr("Ctrl+Y"));
            redoAct->setStatusTip(tr("Redo the last operation"));
            connect(redoAct, SIGNAL(triggered()), this, SLOT(redo()));

            cutAct = new QAction(tr("Cu&t"), this);
            cutAct->setShortcut(tr("Ctrl+X"));
            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->setShortcut(tr("Ctrl+C"));
            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->setShortcut(tr("Ctrl+V"));
            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(tr("Ctrl+B"));
            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(tr("Ctrl+I"));
            italicAct->setStatusTip(tr("Make the text italic"));
            connect(italicAct, SIGNAL(triggered()), this, SLOT(italic()));

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

            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);

            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()));
        }

        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();

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

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