CalendarDemo

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 #ifndef CALENDARDEMO_H
 #define CALENDARDEMO_H

 #include <QMainWindow>
 #include <QDate>
 #include <QtOrganizer/qorganizeritemsaverequest.h>
 #include <QtOrganizer/qorganizeritemremovebyidrequest.h>

 class QOrganizerManager;
 class QOrganizerItem;

 QTORGANIZER_USE_NAMESPACE

 #define ORGANIZER_ITEM_ROLE Qt::UserRole+1
 #define ORGANIZER_CALENDAR_ROLE Qt::UserRole+2

 class QProgressDialog;
 class QStackedWidget;

 class MonthPage;
 class DayPage;
 class EventEditPage;
 class TodoEditPage;
 class JournalEditPage;
 class EventOccurrenceEditPage;
 class AddCalendarPage;
 class EditCalendarsPage;

 class CalendarDemo : public QMainWindow
 {
     Q_OBJECT

 public:
     CalendarDemo(QWidget *parent = nullptr);
     ~CalendarDemo();

 public Q_SLOTS:
     void activateMonthPage();
     void activateDayPage();
     void activateEditPage(const QOrganizerItem &item);
     void activatePreviousPage();
     void addNewEvent();
     void addNewTodo();
     void addNewJournal();
     void changeManager(QOrganizerManager *manager);
     void updateSelectedDay(const QDate& date);

 private Q_SLOTS:
     void switchView();
     void editItem();
     void removeItem();
     void addEvents();
     void importItems();
     void exportItems();
     void deleteAllEntries();
     void addCalendar();
     void editCalendar();
     void editExistingCalendar(QOrganizerManager *manager, QOrganizerCollection* calendar);
     void saveReqStateChanged(QOrganizerAbstractRequest::State);
     void removeReqStateChanged(QOrganizerAbstractRequest::State);

 private:
     void buildMenu();

     QDate m_currentDate;
     QOrganizerManager *m_manager;
     QStackedWidget *m_stackedWidget;
     MonthPage *m_monthPage;
     DayPage *m_dayPage;
     EventEditPage *m_eventEditPage;
     TodoEditPage *m_todoEditPage;
     JournalEditPage *m_journalEditPage;
     EventOccurrenceEditPage *m_eventOccurrenceEditPage;
     AddCalendarPage *m_addCalendarPage;
     EditCalendarsPage *m_editCalendarsPage;

     int m_previousPage;
     QOrganizerItem m_previousItem;

     QAction *m_switchViewAction;

     QOrganizerItemSaveRequest m_saveReq;
     QOrganizerItemRemoveByIdRequest m_remReq;
     QProgressDialog *m_progressDlg;
 };

 #endif // CALENDARDEMO_H