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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 &)));
     }