- Qt 5.5
- Qt Widgets
- Dock Widgets Example
- mainwindow.cpp Example File
- Qt 5.5.1 Reference Documentation

# mainwindow.cpp Example File

mainwindows/dockwidgets/mainwindow.cpp

    /****************************************************************************
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    ** Copyright (C) 2015 The Qt Company Ltd.
    ** Contact: http://www.qt.io/licensing/
    **
    ** This file is part of the examples of the Qt Toolkit.
    **
    ** $QT_BEGIN_LICENSE:BSD$
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    **     from this software without specific prior written permission.
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    #include <QtWidgets>
    #ifndef QT_NO_PRINTDIALOG
    #include <QtPrintSupport>
    #endif

    #include "mainwindow.h"

    MainWindow::MainWindow()
    {
        textEdit = new QTextEdit;
        setCentralWidget(textEdit);

        createActions();
        createMenus();
        createToolBars();
        createStatusBar();
        createDockWindows();

        setWindowTitle(tr("Dock Widgets"));

        newLetter();
        setUnifiedTitleAndToolBarOnMac(true);
    }

    void MainWindow::newLetter()
    {
        textEdit->clear();

        QTextCursor cursor(textEdit->textCursor());
        cursor.movePosition(QTextCursor::Start);
        QTextFrame *topFrame = cursor.currentFrame();
        QTextFrameFormat topFrameFormat = topFrame->frameFormat();
        topFrameFormat.setPadding(16);
        topFrame->setFrameFormat(topFrameFormat);

        QTextCharFormat textFormat;
        QTextCharFormat boldFormat;
        boldFormat.setFontWeight(QFont::Bold);
        QTextCharFormat italicFormat;
        italicFormat.setFontItalic(true);

        QTextTableFormat tableFormat;
        tableFormat.setBorder(1);
        tableFormat.setCellPadding(16);
        tableFormat.setAlignment(Qt::AlignRight);
        cursor.insertTable(1, 1, tableFormat);
        cursor.insertText("The Firm", boldFormat);
        cursor.insertBlock();
        cursor.insertText("321 City Street", textFormat);
        cursor.insertBlock();
        cursor.insertText("Industry Park");
        cursor.insertBlock();
        cursor.insertText("Some Country");
        cursor.setPosition(topFrame->lastPosition());
        cursor.insertText(QDate::currentDate().toString("d MMMM yyyy"), textFormat);
        cursor.insertBlock();
        cursor.insertBlock();
        cursor.insertText("Dear ", textFormat);
        cursor.insertText("NAME", italicFormat);
        cursor.insertText(",", textFormat);
        for (int i = 0; i < 3; ++i)
            cursor.insertBlock();
        cursor.insertText(tr("Yours sincerely,"), textFormat);
        for (int i = 0; i < 3; ++i)
            cursor.insertBlock();
        cursor.insertText("The Boss", textFormat);
        cursor.insertBlock();
        cursor.insertText("ADDRESS", italicFormat);
    }

    void MainWindow::print()
    {
    #ifndef QT_NO_PRINTDIALOG
        QTextDocument *document = textEdit->document();
        QPrinter printer;

        QPrintDialog dlg(&printer, this);
        if (dlg.exec() != QDialog::Accepted) {
            return;
        }

        document->print(&printer);
        statusBar()->showMessage(tr("Ready"), 2000);
    #endif
    }

    void MainWindow::save()
    {
        QString fileName = QFileDialog::getSaveFileName(this,
                            tr("Choose a file name"), ".",
                            tr("HTML (*.html *.htm)"));
        if (fileName.isEmpty())
            return;
        QFile file(fileName);
        if (!file.open(QFile::WriteOnly | QFile::Text)) {
            QMessageBox::warning(this, tr("Dock Widgets"),
                                 tr("Cannot write file %1:\n%2.")
                                 .arg(fileName)
                                 .arg(file.errorString()));
            return;
        }

        QTextStream out(&file);
        QApplication::setOverrideCursor(Qt::WaitCursor);
        out << textEdit->toHtml();
        QApplication::restoreOverrideCursor();

        statusBar()->showMessage(tr("Saved '%1'").arg(fileName), 2000);
    }

    void MainWindow::undo()
    {
        QTextDocument *document = textEdit->document();
        document->undo();
    }

    void MainWindow::insertCustomer(const QString &customer)
    {
        if (customer.isEmpty())
            return;
        QStringList customerList = customer.split(", ");
        QTextDocument *document = textEdit->document();
        QTextCursor cursor = document->find("NAME");
        if (!cursor.isNull()) {
            cursor.beginEditBlock();
            cursor.insertText(customerList.at(0));
            QTextCursor oldcursor = cursor;
            cursor = document->find("ADDRESS");
            if (!cursor.isNull()) {
                for (int i = 1; i < customerList.size(); ++i) {
                    cursor.insertBlock();
                    cursor.insertText(customerList.at(i));
                }
                cursor.endEditBlock();
            }
            else
                oldcursor.endEditBlock();
        }
    }

    void MainWindow::addParagraph(const QString &paragraph)
    {
        if (paragraph.isEmpty())
            return;
        QTextDocument *document = textEdit->document();
        QTextCursor cursor = document->find(tr("Yours sincerely,"));
        if (cursor.isNull())
            return;
        cursor.beginEditBlock();
        cursor.movePosition(QTextCursor::PreviousBlock, QTextCursor::MoveAnchor, 2);
        cursor.insertBlock();
        cursor.insertText(paragraph);
        cursor.insertBlock();
        cursor.endEditBlock();

    }

    void MainWindow::about()
    {
       QMessageBox::about(this, tr("About Dock Widgets"),
                tr("The <b>Dock Widgets</b> example demonstrates how to "
                   "use Qt's dock widgets. You can enter your own text, "
                   "click a customer to add a customer name and "
                   "address, and click standard paragraphs to add them."));
    }

    void MainWindow::createActions()
    {
        newLetterAct = new QAction(QIcon(":/images/new.png"), tr("&New Letter"),
                                   this);
        newLetterAct->setShortcuts(QKeySequence::New);
        newLetterAct->setStatusTip(tr("Create a new form letter"));
        connect(newLetterAct, SIGNAL(triggered()), this, SLOT(newLetter()));

        saveAct = new QAction(QIcon(":/images/save.png"), tr("&Save..."), this);
        saveAct->setShortcuts(QKeySequence::Save);
        saveAct->setStatusTip(tr("Save the current form letter"));
        connect(saveAct, SIGNAL(triggered()), this, SLOT(save()));

        printAct = new QAction(QIcon(":/images/print.png"), tr("&Print..."), this);
        printAct->setShortcuts(QKeySequence::Print);
        printAct->setStatusTip(tr("Print the current form letter"));
        connect(printAct, SIGNAL(triggered()), this, SLOT(print()));

        undoAct = new QAction(QIcon(":/images/undo.png"), tr("&Undo"), this);
        undoAct->setShortcuts(QKeySequence::Undo);
        undoAct->setStatusTip(tr("Undo the last editing action"));
        connect(undoAct, SIGNAL(triggered()), this, SLOT(undo()));

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

        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()));
    }

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

        editMenu = menuBar()->addMenu(tr("&Edit"));
        editMenu->addAction(undoAct);

        viewMenu = menuBar()->addMenu(tr("&View"));

        menuBar()->addSeparator();

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

    void MainWindow::createToolBars()
    {
        fileToolBar = addToolBar(tr("File"));
        fileToolBar->addAction(newLetterAct);
        fileToolBar->addAction(saveAct);
        fileToolBar->addAction(printAct);

        editToolBar = addToolBar(tr("Edit"));
        editToolBar->addAction(undoAct);
    }

    void MainWindow::createStatusBar()
    {
        statusBar()->showMessage(tr("Ready"));
    }

    void MainWindow::createDockWindows()
    {
        QDockWidget *dock = new QDockWidget(tr("Customers"), this);
        dock->setAllowedAreas(Qt::LeftDockWidgetArea | Qt::RightDockWidgetArea);
        customerList = new QListWidget(dock);
        customerList->addItems(QStringList()
                << "John Doe, Harmony Enterprises, 12 Lakeside, Ambleton"
                << "Jane Doe, Memorabilia, 23 Watersedge, Beaton"
                << "Tammy Shea, Tiblanka, 38 Sea Views, Carlton"
                << "Tim Sheen, Caraba Gifts, 48 Ocean Way, Deal"
                << "Sol Harvey, Chicos Coffee, 53 New Springs, Eccleston"
                << "Sally Hobart, Tiroli Tea, 67 Long River, Fedula");
        dock->setWidget(customerList);
        addDockWidget(Qt::RightDockWidgetArea, dock);
        viewMenu->addAction(dock->toggleViewAction());

        dock = new QDockWidget(tr("Paragraphs"), this);
        paragraphsList = new QListWidget(dock);
        paragraphsList->addItems(QStringList()
                << "Thank you for your payment which we have received today."
                << "Your order has been dispatched and should be with you "
                   "within 28 days."
                << "We have dispatched those items that were in stock. The "
                   "rest of your order will be dispatched once all the "
                   "remaining items have arrived at our warehouse. No "
                   "additional shipping charges will be made."
                << "You made a small overpayment (less than $5) which we "
                   "will keep on account for you, or return at your request."
                << "You made a small underpayment (less than $1), but we have "
                   "sent your order anyway. We'll add this underpayment to "
                   "your next bill."
                << "Unfortunately you did not send enough money. Please remit "
                   "an additional $. Your order will be dispatched as soon as "
                   "the complete amount has been received."
                << "You made an overpayment (more than $5). Do you wish to "
                   "buy more items, or should we return the excess to you?");
        dock->setWidget(paragraphsList);
        addDockWidget(Qt::RightDockWidgetArea, dock);
        viewMenu->addAction(dock->toggleViewAction());

        connect(customerList, SIGNAL(currentTextChanged(QString)),
                this, SLOT(insertCustomer(QString)));
        connect(paragraphsList, SIGNAL(currentTextChanged(QString)),
                this, SLOT(addParagraph(QString)));
    }