mainwindow.cpp Example File

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  #include "mainwindow.h"

  #include <QtWidgets>

  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();
  }