Closing a Qt Quick application from QML
This snippet shows how to trigger the closing of a Qt Quick application from QML code. This is needed especially in full screen applications, because there may not be any dedicated hardware key to close the application.
The following QML code calls the global Qt.quit() function which will trigger the ending of the application. In this example, we have used QDeclarativeView to show the Qt Quick UI and thus we must connect the QDeclarativeEngine::quit() signal to the QApplication::quit() slot.
NOTE: Had we used qmlviewer to interpret the QML, the Qt.quit() signal would have been automatically handled.
- Qt 4.7 or higher is installed on your platform.
Qt Project File
#To make sure we use declarative
QT += declarative
#To get files deployed on device / emulator
files.sources += ui.qml
DEPLOYMENT += files
int main(int argc, char *argv)
QApplication app(argc, argv);
QObject::connect((QObject*)view.engine(), SIGNAL(quit()), &app, SLOT(quit()));
#if defined(Q_WS_S60) || defined(Q_WS_MAEMO)
view.setGeometry(100,100, 800, 480);
The calling of the Qt.quit() function in QML code caused the emission of the QDeclarativeEngine::quit() signal, and because this signal was connected to the QApplication::quit() slot, the application was closed.