FutuQML/examples/OrientationExample/main.cpp

#include <QtGui/QApplication>
#include <QtDeclarative/QDeclarativeContext>
#include "qmlapplicationviewer.h"

#if defined(Q_WS_MAEMO_5) || defined(Q_OS_SYMBIAN)
#include <QOrientationSensor>
#include "orientationfilter.h"
QTM_USE_NAMESPACE
#endif

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);

    QmlApplicationViewer viewer;

    QDeclarativeContext* context = viewer.rootContext();


#if defined(Q_WS_MAEMO_5) || defined(Q_OS_SYMBIAN)
    // Create an orientation sensor and add it to QML context
    QOrientationSensor sensor;
    OrientationFilter filter;
    sensor.addFilter(&filter);
    sensor.start();
    context->setContextProperty("filter", &filter);
#endif

    // Lock to landscape for Maemo 5 and portrait for Symbian^3 because we handle orientation switch with animation ourself
#if defined(Q_WS_MAEMO_5)
    viewer.setOrientation(QmlApplicationViewer::ScreenOrientationLockLandscape);
#endif

#if defined(Q_OS_SYMBIAN)
    viewer.setOrientation(QmlApplicationViewer::ScreenOrientationLockPortrait);
#endif

    viewer.setMainQmlFile(QLatin1String("qml/OrientationExample/main.qml"));
    viewer.showExpanded();

    return app.exec();
}