Qt Reference Documentation

# main.cpp Example File

demos/mobile/qtbubblelevel/main.cpp

     /****************************************************************************
     **
     ** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
     ** All rights reserved.
     ** Contact: Nokia Corporation (qt-info@nokia.com)
     **
     ** This file is part of the QtDeclarative module of the Qt Toolkit.
     **
     ** $QT_BEGIN_LICENSE:BSD$
     ** You may use this file under the terms of the BSD license as follows:
     **
     ** "Redistribution and use in source and binary forms, with or without
     ** modification, are permitted provided that the following conditions are
     ** met:
     **   * Redistributions of source code must retain the above copyright
     **     notice, this list of conditions and the following disclaimer.
     **   * Redistributions in binary form must reproduce the above copyright
     **     notice, this list of conditions and the following disclaimer in
     **     the documentation and/or other materials provided with the
     **     distribution.
     **   * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor
     **     the names of its contributors may be used to endorse or promote
     **     products derived from this software without specific prior written
     **     permission.
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     ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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     ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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     ****************************************************************************/

     #include <QtDeclarative>
     #include <QtGui>
     #include <QAccelerometer>

     #include "accelerometerfilter.h"
     #include "settings.h"
     #include "taskswitcher.h"

     // Lock orientation in Symbian
     #ifdef Q_OS_SYMBIAN
         #include <eikenv.h>
         #include <eikappui.h>
         #include <aknenv.h>
         #include <aknappui.h>
     #endif

     QTM_USE_NAMESPACE

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

     #ifdef Q_OS_SYMBIAN
         // Lock orientation to landscape in Symbian
         CAknAppUi* appUi = dynamic_cast<CAknAppUi*> (CEikonEnv::Static()->AppUi());
         TRAP_IGNORE(
             if (appUi)
                 appUi->SetOrientationL(CAknAppUi::EAppUiOrientationLandscape);
         )
     #endif

         QDeclarativeView view;
         view.setSource(QUrl("qrc:/qml/BubbleLevel.qml"));
         view.setResizeMode(QDeclarativeView::SizeRootObjectToView);

         // ![1]
         Settings settings;

         QAccelerometer sensor;
         AccelerometerFilter filter;
         sensor.addFilter(&filter);

         QObject *rootObject = dynamic_cast<QObject*>(view.rootObject());

         // Associate Qt / QML signals and slots
         QObject::connect(rootObject, SIGNAL(saveCorrectionAngle(const QVariant&)),
                          &settings, SLOT(saveCorrectionAngle(const QVariant&)));

         QObject::connect(&filter, SIGNAL(rotationChanged(const QVariant&)),
                          rootObject, SLOT(handleRotation(const QVariant&)));

         QObject::connect(&settings, SIGNAL(correctionAngle(const QVariant&)),
                          rootObject, SLOT(setCorrectionAngle(const QVariant&)));

         QObject::connect((QObject*)view.engine(), SIGNAL(quit()),
                          &app, SLOT(quit()));

     #ifdef Q_WS_MAEMO_5
         TaskSwitcher taskSwitcher;

         QObject::connect(rootObject, SIGNAL(minimizeApplication()),
                          &taskSwitcher, SLOT(minimizeApplication()));

         // Show the task switcher button
         rootObject->setProperty("taskSwitcherVisible", true);
     #endif

         // Read correction factor from permanent storage and emit it to QML side
         settings.loadAndEmitCorrectionAngle();

         // Begin measuring of the accelerometer sensor
         sensor.start();

     #if defined(Q_WS_MAEMO_5) || defined(Q_OS_SYMBIAN) || defined(Q_WS_SIMULATOR)
         view.setGeometry(QApplication::desktop()->screenGeometry());
         view.showFullScreen();
     #else
         view.setGeometry((QRect(100, 100, 800, 480)));
         view.show();
     #endif

         return app.exec();
     }