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# window.cpp Example File
widgets/calendarwidget/window.cpp

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     #include <QtGui>

     #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)
     {
         calendar->setLocale(localeCombo->itemData(index).toLocale());
     }

     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()
     {
         if (firstFridayCheckBox->isChecked()) {
             QDate firstFriday(calendar->yearShown(), calendar->monthShown(), 1);
             while (firstFriday.dayOfWeek() != Qt::Friday)
                 firstFriday = firstFriday.addDays(1);
             QTextCharFormat firstFridayFormat;
             firstFridayFormat.setForeground(Qt::blue);
             calendar->setDateTextFormat(firstFriday, firstFridayFormat);
         }

         //May First in Red takes precedence
         if (mayFirstCheckBox->isChecked()) {
             const QDate mayFirst(calendar->yearShown(), 5, 1);
             QTextCharFormat mayFirstFormat;
             mayFirstFormat.setForeground(Qt::red);
             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(weekendColorCombo, SIGNAL(currentIndexChanged(int)),
                 this, SLOT(weekendFormatChanged()));
         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"), Qt::red);
         comboBox->addItem(tr("Blue"), Qt::blue);
         comboBox->addItem(tr("Black"), Qt::black);
         comboBox->addItem(tr("Magenta"), Qt::magenta);
         return comboBox;
     }