window.cpp Example File

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  #include <QtWidgets>

  #include "window.h"

  Window::Window()
  {
      createPreviewGroupBox();
      createGeneralOptionsGroupBox();
      createDatesGroupBox();
      createTextFormatsGroupBox();

      QGridLayout *layout = new QGridLayout;
      layout->addWidget(previewGroupBox, 0, 0);
      layout->addWidget(generalOptionsGroupBox, 0, 1);
      layout->addWidget(datesGroupBox, 1, 0);
      layout->addWidget(textFormatsGroupBox, 1, 1);
      layout->setSizeConstraint(QLayout::SetFixedSize);
      setLayout(layout);

      previewLayout->setRowMinimumHeight(0, calendar->sizeHint().height());
      previewLayout->setColumnMinimumWidth(0, calendar->sizeHint().width());

      setWindowTitle(tr("Calendar Widget"));
  }

  void Window::localeChanged(int index)
  {
      const QLocale newLocale(localeCombo->itemData(index).toLocale());
      calendar->setLocale(newLocale);
      int newLocaleFirstDayIndex = firstDayCombo->findData(newLocale.firstDayOfWeek());
      firstDayCombo->setCurrentIndex(newLocaleFirstDayIndex);
  }

  void Window::firstDayChanged(int index)
  {
      calendar->setFirstDayOfWeek(Qt::DayOfWeek(
                                  firstDayCombo->itemData(index).toInt()));
  }

  void Window::selectionModeChanged(int index)
  {
      calendar->setSelectionMode(QCalendarWidget::SelectionMode(
                                 selectionModeCombo->itemData(index).toInt()));
  }

  void Window::horizontalHeaderChanged(int index)
  {
      calendar->setHorizontalHeaderFormat(QCalendarWidget::HorizontalHeaderFormat(
          horizontalHeaderCombo->itemData(index).toInt()));
  }

  void Window::verticalHeaderChanged(int index)
  {
      calendar->setVerticalHeaderFormat(QCalendarWidget::VerticalHeaderFormat(
          verticalHeaderCombo->itemData(index).toInt()));
  }

  void Window::selectedDateChanged()
  {
      currentDateEdit->setDate(calendar->selectedDate());
  }

  void Window::minimumDateChanged(const QDate &date)
  {
      calendar->setMinimumDate(date);
      maximumDateEdit->setDate(calendar->maximumDate());
  }

  void Window::maximumDateChanged(const QDate &date)
  {
      calendar->setMaximumDate(date);
      minimumDateEdit->setDate(calendar->minimumDate());
  }

  void Window::weekdayFormatChanged()
  {
      QTextCharFormat format;

      format.setForeground(qvariant_cast<QColor>(
          weekdayColorCombo->itemData(weekdayColorCombo->currentIndex())));
      calendar->setWeekdayTextFormat(Qt::Monday, format);
      calendar->setWeekdayTextFormat(Qt::Tuesday, format);
      calendar->setWeekdayTextFormat(Qt::Wednesday, format);
      calendar->setWeekdayTextFormat(Qt::Thursday, format);
      calendar->setWeekdayTextFormat(Qt::Friday, format);
  }

  void Window::weekendFormatChanged()
  {
      QTextCharFormat format;

      format.setForeground(qvariant_cast<QColor>(
          weekendColorCombo->itemData(weekendColorCombo->currentIndex())));
      calendar->setWeekdayTextFormat(Qt::Saturday, format);
      calendar->setWeekdayTextFormat(Qt::Sunday, format);
  }

  void Window::reformatHeaders()
  {
      QString text = headerTextFormatCombo->currentText();
      QTextCharFormat format;

      if (text == tr("Bold")) {
          format.setFontWeight(QFont::Bold);
      } else if (text == tr("Italic")) {
          format.setFontItalic(true);
      } else if (text == tr("Green")) {
          format.setForeground(Qt::green);
      }
      calendar->setHeaderTextFormat(format);
  }

  void Window::reformatCalendarPage()
  {
      QTextCharFormat mayFirstFormat;
      const QDate mayFirst(calendar->yearShown(), 5, 1);

      QTextCharFormat firstFridayFormat;
      QDate firstFriday(calendar->yearShown(), calendar->monthShown(), 1);
      while (firstFriday.dayOfWeek() != Qt::Friday)
          firstFriday = firstFriday.addDays(1);

      if (firstFridayCheckBox->isChecked()) {
          firstFridayFormat.setForeground(Qt::blue);
      } else { // Revert to regular colour for this day of the week.
          Qt::DayOfWeek dayOfWeek(static_cast<Qt::DayOfWeek>(firstFriday.dayOfWeek()));
          firstFridayFormat.setForeground(calendar->weekdayTextFormat(dayOfWeek).foreground());
      }

      calendar->setDateTextFormat(firstFriday, firstFridayFormat);

      // When it is checked, "May First in Red" always takes precedence over "First Friday in Blue".
      if (mayFirstCheckBox->isChecked()) {
          mayFirstFormat.setForeground(Qt::red);
      } else if (!firstFridayCheckBox->isChecked() || firstFriday != mayFirst) {
          // We can now be certain we won't be resetting "May First in Red" when we restore
          // may 1st's regular colour for this day of the week.
          Qt::DayOfWeek dayOfWeek(static_cast<Qt::DayOfWeek>(mayFirst.dayOfWeek()));
          calendar->setDateTextFormat(mayFirst, calendar->weekdayTextFormat(dayOfWeek));
      }

      calendar->setDateTextFormat(mayFirst, mayFirstFormat);
  }

  void Window::createPreviewGroupBox()
  {
      previewGroupBox = new QGroupBox(tr("Preview"));

      calendar = new QCalendarWidget;
      calendar->setMinimumDate(QDate(1900, 1, 1));
      calendar->setMaximumDate(QDate(3000, 1, 1));
      calendar->setGridVisible(true);

      connect(calendar, SIGNAL(currentPageChanged(int,int)),
              this, SLOT(reformatCalendarPage()));

      previewLayout = new QGridLayout;
      previewLayout->addWidget(calendar, 0, 0, Qt::AlignCenter);
      previewGroupBox->setLayout(previewLayout);
  }

  void Window::createGeneralOptionsGroupBox()
  {
      generalOptionsGroupBox = new QGroupBox(tr("General Options"));

      localeCombo = new QComboBox;
      int curLocaleIndex = -1;
      int index = 0;
      for (int _lang = QLocale::C; _lang <= QLocale::LastLanguage; ++_lang) {
          QLocale::Language lang = static_cast<QLocale::Language>(_lang);
          QList<QLocale::Country> countries = QLocale::countriesForLanguage(lang);
          for (int i = 0; i < countries.count(); ++i) {
              QLocale::Country country = countries.at(i);
              QString label = QLocale::languageToString(lang);
              label += QLatin1Char('/');
              label += QLocale::countryToString(country);
              QLocale locale(lang, country);
              if (this->locale().language() == lang && this->locale().country() == country)
                  curLocaleIndex = index;
              localeCombo->addItem(label, locale);
              ++index;
          }
      }
      if (curLocaleIndex != -1)
          localeCombo->setCurrentIndex(curLocaleIndex);
      localeLabel = new QLabel(tr("&Locale"));
      localeLabel->setBuddy(localeCombo);

      firstDayCombo = new QComboBox;
      firstDayCombo->addItem(tr("Sunday"), Qt::Sunday);
      firstDayCombo->addItem(tr("Monday"), Qt::Monday);
      firstDayCombo->addItem(tr("Tuesday"), Qt::Tuesday);
      firstDayCombo->addItem(tr("Wednesday"), Qt::Wednesday);
      firstDayCombo->addItem(tr("Thursday"), Qt::Thursday);
      firstDayCombo->addItem(tr("Friday"), Qt::Friday);
      firstDayCombo->addItem(tr("Saturday"), Qt::Saturday);

      firstDayLabel = new QLabel(tr("Wee&k starts on:"));
      firstDayLabel->setBuddy(firstDayCombo);

      selectionModeCombo = new QComboBox;
      selectionModeCombo->addItem(tr("Single selection"),
                                  QCalendarWidget::SingleSelection);
      selectionModeCombo->addItem(tr("None"), QCalendarWidget::NoSelection);

      selectionModeLabel = new QLabel(tr("&Selection mode:"));
      selectionModeLabel->setBuddy(selectionModeCombo);

      gridCheckBox = new QCheckBox(tr("&Grid"));
      gridCheckBox->setChecked(calendar->isGridVisible());

      navigationCheckBox = new QCheckBox(tr("&Navigation bar"));
      navigationCheckBox->setChecked(true);

      horizontalHeaderCombo = new QComboBox;
      horizontalHeaderCombo->addItem(tr("Single letter day names"),
                                     QCalendarWidget::SingleLetterDayNames);
      horizontalHeaderCombo->addItem(tr("Short day names"),
                                     QCalendarWidget::ShortDayNames);
      horizontalHeaderCombo->addItem(tr("None"),
                                     QCalendarWidget::NoHorizontalHeader);
      horizontalHeaderCombo->setCurrentIndex(1);

      horizontalHeaderLabel = new QLabel(tr("&Horizontal header:"));
      horizontalHeaderLabel->setBuddy(horizontalHeaderCombo);

      verticalHeaderCombo = new QComboBox;
      verticalHeaderCombo->addItem(tr("ISO week numbers"),
                                   QCalendarWidget::ISOWeekNumbers);
      verticalHeaderCombo->addItem(tr("None"), QCalendarWidget::NoVerticalHeader);

      verticalHeaderLabel = new QLabel(tr("&Vertical header:"));
      verticalHeaderLabel->setBuddy(verticalHeaderCombo);

      connect(localeCombo, SIGNAL(currentIndexChanged(int)),
              this, SLOT(localeChanged(int)));
      connect(firstDayCombo, SIGNAL(currentIndexChanged(int)),
              this, SLOT(firstDayChanged(int)));
      connect(selectionModeCombo, SIGNAL(currentIndexChanged(int)),
              this, SLOT(selectionModeChanged(int)));
      connect(gridCheckBox, SIGNAL(toggled(bool)),
              calendar, SLOT(setGridVisible(bool)));
      connect(navigationCheckBox, SIGNAL(toggled(bool)),
              calendar, SLOT(setNavigationBarVisible(bool)));
      connect(horizontalHeaderCombo, SIGNAL(currentIndexChanged(int)),
              this, SLOT(horizontalHeaderChanged(int)));
      connect(verticalHeaderCombo, SIGNAL(currentIndexChanged(int)),
              this, SLOT(verticalHeaderChanged(int)));

      QHBoxLayout *checkBoxLayout = new QHBoxLayout;
      checkBoxLayout->addWidget(gridCheckBox);
      checkBoxLayout->addStretch();
      checkBoxLayout->addWidget(navigationCheckBox);

      QGridLayout *outerLayout = new QGridLayout;
      outerLayout->addWidget(localeLabel, 0, 0);
      outerLayout->addWidget(localeCombo, 0, 1);
      outerLayout->addWidget(firstDayLabel, 1, 0);
      outerLayout->addWidget(firstDayCombo, 1, 1);
      outerLayout->addWidget(selectionModeLabel, 2, 0);
      outerLayout->addWidget(selectionModeCombo, 2, 1);
      outerLayout->addLayout(checkBoxLayout, 3, 0, 1, 2);
      outerLayout->addWidget(horizontalHeaderLabel, 4, 0);
      outerLayout->addWidget(horizontalHeaderCombo, 4, 1);
      outerLayout->addWidget(verticalHeaderLabel, 5, 0);
      outerLayout->addWidget(verticalHeaderCombo, 5, 1);
      generalOptionsGroupBox->setLayout(outerLayout);

      firstDayChanged(firstDayCombo->currentIndex());
      selectionModeChanged(selectionModeCombo->currentIndex());
      horizontalHeaderChanged(horizontalHeaderCombo->currentIndex());
      verticalHeaderChanged(verticalHeaderCombo->currentIndex());
  }

  void Window::createDatesGroupBox()
  {
      datesGroupBox = new QGroupBox(tr("Dates"));

      minimumDateEdit = new QDateEdit;
      minimumDateEdit->setDisplayFormat("MMM d yyyy");
      minimumDateEdit->setDateRange(calendar->minimumDate(),
                                    calendar->maximumDate());
      minimumDateEdit->setDate(calendar->minimumDate());

      minimumDateLabel = new QLabel(tr("&Minimum Date:"));
      minimumDateLabel->setBuddy(minimumDateEdit);

      currentDateEdit = new QDateEdit;
      currentDateEdit->setDisplayFormat("MMM d yyyy");
      currentDateEdit->setDate(calendar->selectedDate());
      currentDateEdit->setDateRange(calendar->minimumDate(),
                                    calendar->maximumDate());

      currentDateLabel = new QLabel(tr("&Current Date:"));
      currentDateLabel->setBuddy(currentDateEdit);

      maximumDateEdit = new QDateEdit;
      maximumDateEdit->setDisplayFormat("MMM d yyyy");
      maximumDateEdit->setDateRange(calendar->minimumDate(),
                                    calendar->maximumDate());
      maximumDateEdit->setDate(calendar->maximumDate());

      maximumDateLabel = new QLabel(tr("Ma&ximum Date:"));
      maximumDateLabel->setBuddy(maximumDateEdit);

      connect(currentDateEdit, SIGNAL(dateChanged(QDate)),
              calendar, SLOT(setSelectedDate(QDate)));
      connect(calendar, SIGNAL(selectionChanged()),
              this, SLOT(selectedDateChanged()));
      connect(minimumDateEdit, SIGNAL(dateChanged(QDate)),
              this, SLOT(minimumDateChanged(QDate)));
      connect(maximumDateEdit, SIGNAL(dateChanged(QDate)),
              this, SLOT(maximumDateChanged(QDate)));

      QGridLayout *dateBoxLayout = new QGridLayout;
      dateBoxLayout->addWidget(currentDateLabel, 1, 0);
      dateBoxLayout->addWidget(currentDateEdit, 1, 1);
      dateBoxLayout->addWidget(minimumDateLabel, 0, 0);
      dateBoxLayout->addWidget(minimumDateEdit, 0, 1);
      dateBoxLayout->addWidget(maximumDateLabel, 2, 0);
      dateBoxLayout->addWidget(maximumDateEdit, 2, 1);
      dateBoxLayout->setRowStretch(3, 1);

      datesGroupBox->setLayout(dateBoxLayout);
  }

  void Window::createTextFormatsGroupBox()
  {
      textFormatsGroupBox = new QGroupBox(tr("Text Formats"));

      weekdayColorCombo = createColorComboBox();
      weekdayColorCombo->setCurrentIndex(
              weekdayColorCombo->findText(tr("Black")));

      weekdayColorLabel = new QLabel(tr("&Weekday color:"));
      weekdayColorLabel->setBuddy(weekdayColorCombo);

      weekendColorCombo = createColorComboBox();
      weekendColorCombo->setCurrentIndex(
              weekendColorCombo->findText(tr("Red")));

      weekendColorLabel = new QLabel(tr("Week&end color:"));
      weekendColorLabel->setBuddy(weekendColorCombo);

      headerTextFormatCombo = new QComboBox;
      headerTextFormatCombo->addItem(tr("Bold"));
      headerTextFormatCombo->addItem(tr("Italic"));
      headerTextFormatCombo->addItem(tr("Plain"));

      headerTextFormatLabel = new QLabel(tr("&Header text:"));
      headerTextFormatLabel->setBuddy(headerTextFormatCombo);

      firstFridayCheckBox = new QCheckBox(tr("&First Friday in blue"));

      mayFirstCheckBox = new QCheckBox(tr("May &1 in red"));

      connect(weekdayColorCombo, SIGNAL(currentIndexChanged(int)),
              this, SLOT(weekdayFormatChanged()));
      connect(weekdayColorCombo, SIGNAL(currentIndexChanged(int)),
              this, SLOT(reformatCalendarPage()));
      connect(weekendColorCombo, SIGNAL(currentIndexChanged(int)),
              this, SLOT(weekendFormatChanged()));
      connect(weekendColorCombo, SIGNAL(currentIndexChanged(int)),
              this, SLOT(reformatCalendarPage()));
      connect(headerTextFormatCombo, SIGNAL(currentIndexChanged(QString)),
              this, SLOT(reformatHeaders()));
      connect(firstFridayCheckBox, SIGNAL(toggled(bool)),
              this, SLOT(reformatCalendarPage()));
      connect(mayFirstCheckBox, SIGNAL(toggled(bool)),
              this, SLOT(reformatCalendarPage()));

      QHBoxLayout *checkBoxLayout = new QHBoxLayout;
      checkBoxLayout->addWidget(firstFridayCheckBox);
      checkBoxLayout->addStretch();
      checkBoxLayout->addWidget(mayFirstCheckBox);

      QGridLayout *outerLayout = new QGridLayout;
      outerLayout->addWidget(weekdayColorLabel, 0, 0);
      outerLayout->addWidget(weekdayColorCombo, 0, 1);
      outerLayout->addWidget(weekendColorLabel, 1, 0);
      outerLayout->addWidget(weekendColorCombo, 1, 1);
      outerLayout->addWidget(headerTextFormatLabel, 2, 0);
      outerLayout->addWidget(headerTextFormatCombo, 2, 1);
      outerLayout->addLayout(checkBoxLayout, 3, 0, 1, 2);
      textFormatsGroupBox->setLayout(outerLayout);

      weekdayFormatChanged();
      weekendFormatChanged();
      reformatHeaders();
      reformatCalendarPage();
  }

  QComboBox *Window::createColorComboBox()
  {
      QComboBox *comboBox = new QComboBox;
      comboBox->addItem(tr("Red"), QColor(Qt::red));
      comboBox->addItem(tr("Blue"), QColor(Qt::blue));
      comboBox->addItem(tr("Black"), QColor(Qt::black));
      comboBox->addItem(tr("Magenta"), QColor(Qt::magenta));
      return comboBox;
  }