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# mainwindow.cpp Example File
richtext/calendar/mainwindow.cpp

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     #include <QtGui>

     #include "mainwindow.h"

     MainWindow::MainWindow()
     {
         selectedDate = QDate::currentDate();
         fontSize = 10;

         QWidget *centralWidget = new QWidget;

         QLabel *dateLabel = new QLabel(tr("Date:"));
         QComboBox *monthCombo = new QComboBox;

         for (int month = 1; month <= 12; ++month)
             monthCombo->addItem(QDate::longMonthName(month));

         QDateTimeEdit *yearEdit = new QDateTimeEdit;
         yearEdit->setDisplayFormat("yyyy");
         yearEdit->setDateRange(QDate(1753, 1, 1), QDate(8000, 1, 1));

         monthCombo->setCurrentIndex(selectedDate.month() - 1);
         yearEdit->setDate(selectedDate);

         QLabel *fontSizeLabel = new QLabel(tr("Font size:"));
         QSpinBox *fontSizeSpinBox = new QSpinBox;
         fontSizeSpinBox->setRange(1, 64);
         fontSizeSpinBox->setValue(10);

         editor = new QTextBrowser;
         insertCalendar();

         connect(monthCombo, SIGNAL(activated(int)), this, SLOT(setMonth(int)));
         connect(yearEdit, SIGNAL(dateChanged(QDate)), this, SLOT(setYear(QDate)));
         connect(fontSizeSpinBox, SIGNAL(valueChanged(int)),
                 this, SLOT(setFontSize(int)));

         QHBoxLayout *controlsLayout = new QHBoxLayout;
         controlsLayout->addWidget(dateLabel);
         controlsLayout->addWidget(monthCombo);
         controlsLayout->addWidget(yearEdit);
         controlsLayout->addSpacing(24);
         controlsLayout->addWidget(fontSizeLabel);
         controlsLayout->addWidget(fontSizeSpinBox);
         controlsLayout->addStretch(1);

         QVBoxLayout *centralLayout = new QVBoxLayout;
         centralLayout->addLayout(controlsLayout);
         centralLayout->addWidget(editor, 1);
         centralWidget->setLayout(centralLayout);

         setCentralWidget(centralWidget);
     }

     void MainWindow::insertCalendar()
     {
         editor->clear();
         QTextCursor cursor = editor->textCursor();
         cursor.beginEditBlock();

         QDate date(selectedDate.year(), selectedDate.month(), 1);

         QTextTableFormat tableFormat;
         tableFormat.setAlignment(Qt::AlignHCenter);
         tableFormat.setBackground(QColor("#e0e0e0"));
         tableFormat.setCellPadding(2);
         tableFormat.setCellSpacing(4);
         QVector<QTextLength> constraints;
         constraints << QTextLength(QTextLength::PercentageLength, 14)
                     << QTextLength(QTextLength::PercentageLength, 14)
                     << QTextLength(QTextLength::PercentageLength, 14)
                     << QTextLength(QTextLength::PercentageLength, 14)
                     << QTextLength(QTextLength::PercentageLength, 14)
                     << QTextLength(QTextLength::PercentageLength, 14)
                     << QTextLength(QTextLength::PercentageLength, 14);
         tableFormat.setColumnWidthConstraints(constraints);

         QTextTable *table = cursor.insertTable(1, 7, tableFormat);

         QTextFrame *frame = cursor.currentFrame();
         QTextFrameFormat frameFormat = frame->frameFormat();
         frameFormat.setBorder(1);
         frame->setFrameFormat(frameFormat);

         QTextCharFormat format = cursor.charFormat();
         format.setFontPointSize(fontSize);

         QTextCharFormat boldFormat = format;
         boldFormat.setFontWeight(QFont::Bold);

         QTextCharFormat highlightedFormat = boldFormat;
         highlightedFormat.setBackground(Qt::yellow);

         for (int weekDay = 1; weekDay <= 7; ++weekDay) {
             QTextTableCell cell = table->cellAt(0, weekDay-1);
             QTextCursor cellCursor = cell.firstCursorPosition();
             cellCursor.insertText(QString("%1").arg(QDate::longDayName(weekDay)),
                                   boldFormat);
         }

         table->insertRows(table->rows(), 1);

         while (date.month() == selectedDate.month()) {
             int weekDay = date.dayOfWeek();
             QTextTableCell cell = table->cellAt(table->rows()-1, weekDay-1);
             QTextCursor cellCursor = cell.firstCursorPosition();

             if (date == QDate::currentDate())
                 cellCursor.insertText(QString("%1").arg(date.day()), highlightedFormat);
             else
                 cellCursor.insertText(QString("%1").arg(date.day()), format);

             date = date.addDays(1);
             if (weekDay == 7 && date.month() == selectedDate.month())
                 table->insertRows(table->rows(), 1);
         }

         cursor.endEditBlock();
         setWindowTitle(tr("Calendar for %1 %2"
             ).arg(QDate::longMonthName(selectedDate.month())
             ).arg(selectedDate.year()));
     }

     void MainWindow::setFontSize(int size)
     {
         fontSize = size;
         insertCalendar();
     }

     void MainWindow::setMonth(int month)
     {
         selectedDate = QDate(selectedDate.year(), month + 1, selectedDate.day());
         insertCalendar();
     }

     void MainWindow::setYear(QDate date)
     {
         selectedDate = QDate(date.year(), selectedDate.month(), selectedDate.day());
         insertCalendar();
     }