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mainwindow.cpp Example File
mainwindows/dockwidgets/mainwindow.cpp

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 #include <QtGui>

 #include "mainwindow.h"

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

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

     setWindowTitle(tr("Dock Widgets"));

     newLetter();
 }

 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()
 {
     QTextDocument *document = textEdit->document();
     QPrinter printer;

     QPrintDialog *dlg = new QPrintDialog(&printer, this);
     if (dlg->exec() != QDialog::Accepted)
         return;

     document->print(&printer);

     statusBar()->showMessage(tr("Ready"), 2000);
 }

 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->setShortcut(tr("Ctrl+N"));
     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->setShortcut(tr("Ctrl+S"));
     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->setShortcut(tr("Ctrl+P"));
     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->setShortcut(tr("Ctrl+Z"));
     undoAct->setStatusTip(tr("Undo the last editing action"));
     connect(undoAct, SIGNAL(triggered()), this, SLOT(undo()));

     quitAct = new QAction(tr("&Quit"), this);
     quitAct->setShortcut(tr("Ctrl+Q"));
     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(const QString &)),
             this, SLOT(insertCustomer(const QString &)));
     connect(paragraphsList, SIGNAL(currentTextChanged(const QString &)),
             this, SLOT(addParagraph(const QString &)));
 }


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Qt 4.3.5