mainwindow.cpp Example File

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 #include <QtWidgets>

 #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);

     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)));

     fontSizeSpinBox->setValue(10);

     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();
 }