Qt 5.8 | Qt Quick Controls | Qt Quick Controls Examples | Qt Quick Controls - Calendar Example

Qt 5.8.0 Reference Documentation

# Qt Quick Controls - Calendar Example

The Calendar example displays a Calendar control and an events list for the selected date. It uses a C++ class to fetch the event details from an SQLite database. The example app uses a custom CalendarStyle to highlight the selected date and mark the dates that have events.

The following snippet from main.qml shows how the Calendar control is used in the app:

      Calendar {
          id: calendar
          width: (parent.width > parent.height ? parent.width * 0.6 - parent.spacing : parent.width)
          height: (parent.height > parent.width ? parent.height * 0.6 - parent.spacing : parent.height)
          frameVisible: true
          weekNumbersVisible: true
          selectedDate: new Date(2014, 0, 1)
          focus: true

          style: CalendarStyle {
              dayDelegate: Item {
                       ...
                  }
             }
      }

The C++ class, SqlEventModel, inherits SqlQueryModel to create a database with dummy events for certain dates.

      SqlEventModel::SqlEventModel()
      {
          createConnection();
      }

      void SqlEventModel::createConnection()
      {
          QSqlDatabase db = QSqlDatabase::addDatabase("QSQLITE");
          db.setDatabaseName(":memory:");
          if (!db.open()) {
              qFatal("Cannot open database");
              return;
          }

          QSqlQuery query;
          // We store the time as seconds because it's easier to query.
          query.exec("create table Event (name TEXT, startDate DATE, startTime INT, endDate DATE, endTime INT)");
          query.exec("insert into Event values('Grocery shopping', '2014-01-01', 36000, '2014-01-01', 39600)");
          query.exec("insert into Event values('Ice skating', '2014-01-01', 57600, '2014-01-01', 61200)");
          query.exec("insert into Event values('Doctor''s appointment', '2014-01-15', 57600, '2014-01-15', 63000)");
          query.exec("insert into Event values('Conference', '2014-01-24', 32400, '2014-01-28', 61200)");

          return;
      }

In main.qml, the SqlEventModel custom type is used to get the list of events to mark the dates on the calendar.

      SqlEventModel {
          id: eventModel
      }

      Calendar {
          ...
          style: CalendarStyle {
              dayDelegate: Item {
                  ...
                  Image {
                      visible: eventModel.eventsForDate(styleData.date).length > 0
                      ...
                      source: "qrc:/images/eventindicator.png"
                  }
              }
          }
      }

The app uses a Flow type to position the items, and manipulates the items' width and height based on the orientation change on mobile devices.

      Calendar {
          id: calendar
          width: (parent.width > parent.height ? parent.width * 0.6 - parent.spacing : parent.width)
          height: (parent.height > parent.width ? parent.height * 0.6 - parent.spacing : parent.height)
      }

      Rectangle {
          width: (parent.width > parent.height ? parent.width * 0.4 - parent.spacing : parent.width)
          height: (parent.height > parent.width ? parent.height * 0.4 - parent.spacing : parent.height)
          border.color: Qt.darker(color, 1.2)

          ListView {
              ...
          }
      }

## Running the Example

To run the example from Qt Creator, open the Welcome mode and select the example from Examples. For more information, visit Building and Running an Example.

Files:

- calendar/qml/main.qml
- calendar/src/event.cpp
- calendar/src/event.h
- calendar/src/sqleventmodel.cpp
- calendar/src/sqleventmodel.h
- calendar/src/main.cpp
- calendar/calendar.pro
- calendar/resources.qrc

Images:

- calendar/images/eventindicator.png