Qt Reference Documentation

# mainwindow.cpp Example File

demos/mobile/quickhit/mainwindow.cpp

     /****************************************************************************
     **
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     ** Contact: Nokia Corporation (qt-info@nokia.com)
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     ** This file is part of the QtDeclarative module of the Qt Toolkit.
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     #include "mainwindow.h"
     #include "gameengine.h"
     #include "plugins/levelplugininterface.h"

     #include <QDebug>
     #include <QDir>
     #include <QMessageBox>
     #include <QLibraryInfo>
     #include <QDeclarativeEngine>
     #include <QDesktopWidget>

     MainWindow::MainWindow(QWidget *parent)
         : QDeclarativeView(parent)
     {

     #ifdef Q_WS_MAEMO_5
         window()->setAttribute(Qt::WA_Maemo5PortraitOrientation, true);
     #endif

         // Game engine
         m_gameEngine = new GameEngine(this);

         // Load all levels plugins
         m_levelPlugin = 0;
         loadLevelPlugins();

         // QML main window
         engine()->addImportPath("./imports");
         setResizeMode(QDeclarativeView::SizeRootObjectToView);

         // Set game engine visible to QML
         rootContext()->setContextProperty("GameEngine", m_gameEngine);

         // Set QML source
         setSource(QUrl("qrc:/Game.qml"));
         //setSource(QUrl("../QuickHit/Game.qml"));

         // Store QML root object for game engine
         QObject *ro = static_cast<QObject*>(rootObject());
         m_gameEngine->setGameQml(ro);
         m_gameEngine->findQmlObjects();

         // Application foreground / background event filter for filterin incoming call (window)
         // when game will be paused
         m_eventFilter = new MyEventFilter(this);
         QObject::connect(m_eventFilter,SIGNAL(activationChangeFiltered()),this,SLOT(activationChangeFiltered()));
         qApp->installEventFilter(m_eventFilter);

         // Remove context menu from the all widgets
         QWidgetList widgets = QApplication::allWidgets();
         QWidget* w = 0;
         foreach (w,widgets){
             w->setContextMenuPolicy(Qt::NoContextMenu);
         }
     }

     MainWindow::~MainWindow()
     {
         for (int i=0;i<m_plugins.count();i++) {
             m_plugins[i]->unload();
         }
         m_plugins.clear();

     }

     void MainWindow::activationChangeFiltered()
     {
         m_gameEngine->pauseGame();
     }

     void MainWindow::levelActivated(int index)
     {
         // Set level for the game engine
         createPlugin(index);
         rootContext()->setContextProperty("LevelPlugin", m_levelPlugin);
         m_gameEngine->setGameLevel(m_levelPlugin);
     }

     void MainWindow::loadLevelPlugins()
     {
     #if defined (Q_OS_SYMBIAN)
         bool exists_c = loadPlugins("c", "quickhitlevels");
         bool exists_e = loadPlugins("e", "quickhitlevels");
         bool exists_f = loadPlugins("f", "quickhitlevels");
         if (exists_c || exists_e || exists_f) {
             m_gameEngine->setPluginList(m_plugins);
             createPlugin();
         }
         else {
             //QMessageBox::information(this, "QuickHit", "Could not load any of the quickhitlevels");
         }
     #else
         if (loadPlugins("c", "quickhitlevels")) {
             m_gameEngine->setPluginList(m_plugins);
             createPlugin();
         }
         else {
             //QMessageBox::information(this, "QuickHit", "Could not load any of the quickhitlevels");
         }

     #endif
     }

     bool MainWindow::loadPlugins(QString drive, QString pluginDir)
     {
     #if defined (Q_OS_SYMBIAN)
         QDir pluginsDir(drive + ":" + QLibraryInfo::location(QLibraryInfo::PluginsPath));
     #elif defined Q_OS_WIN32
         QDir pluginsDir = QDir::currentPath();
     #else
         QDir pluginsDir(QLibraryInfo::location(QLibraryInfo::PluginsPath));
     #endif
         pluginsDir.cd(pluginDir);

         qDebug() << "Loads plugins from : " << pluginsDir.path();

         bool newPluginsLoaded = false;

         foreach (QString fileName, pluginsDir.entryList(QDir::Files))
             {
                 // Accept only plugin files
     #if defined (Q_OS_SYMBIAN)
                 if (fileName.contains(".qtplugin",Qt::CaseInsensitive)) {
     #elif defined (Q_WS_MAEMO_5)
                 if (fileName.contains(".so",Qt::CaseInsensitive)) {
     #else
                 if (fileName.contains(".dll",Qt::CaseInsensitive)) {
     #endif

                     // Create plugin loader
                     QPluginLoader* pluginLoader = new QPluginLoader(pluginsDir.absoluteFilePath(fileName));
                     // Load plugin
                     bool ret = pluginLoader->load();
                     if (!ret) {
                         // Loading failed
                         qDebug() << "Could not load plugin " << fileName;
                     } else {
                         // Loading done
                         // Test creating plugin
                         QObject *plugin = 0;
                         LevelPluginInterface* pluginIF = 0;
                         plugin = pluginLoader->instance();
                         pluginIF = qobject_cast<LevelPluginInterface*> (plugin);
                         if (pluginIF) {
                             qDebug() << "Plugin can be created";
                             // Store loader to array
                             m_plugins.append(pluginLoader);
                             newPluginsLoaded = true;
                         } else {
                             pluginLoader->unload();
                             qDebug() << "Plugin can NOT be created!";
                         }
                     }
                 }
             }

         return newPluginsLoaded;
     }

     void MainWindow::createPlugin(int index)
     {
         if (index == -1) {
             return;
         }

         m_levelPlugin = 0;

         // Try to create plugin instance
         QPluginLoader* pluginLoader = m_plugins[index];
         QObject *plugin = pluginLoader->instance();
         if (plugin) {
             // Plugin instance created
             // Cast plugin to LevelPluginInterface, that is common for all plugins
             LevelPluginInterface* pluginIF = qobject_cast<LevelPluginInterface*> (plugin);
             m_levelPlugin = pluginIF;
             qDebug() << "Plugin created: " << index;
         }
         else {
             qDebug() << "Creating plugin failed!";
             QMessageBox::information(this, "QuickHit", "Could not create quickhitlevels");
         }
     }

     void MainWindow::printObjectTree(QObject* parent)
     {
        if (parent) {
             qDebug() << "className:" << parent->metaObject()->className();
             qDebug() << "objectName:" << parent->objectName();

             QObjectList list = parent->children();
             QObject* item;
             foreach (item,list) {
                 if (item->children().count()>0) {
                     qDebug() << "--Childrens found--";
                     printObjectTree(item);
                 } else {
                     qDebug() << "className:" << item->metaObject()->className();
                     qDebug() << "objectName:" << item->objectName();
                 }
             }
         } else {
             qDebug() << "object NULL";
         }

     }