Qt 5.11 | Qt Widgets | Calendar Example | mainwindow.cpp Example File

Qt 5.11.3 Reference Documentation

# mainwindow.cpp Example File

richtext/calendar/mainwindow.cpp

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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();
      }