Qt Reference Documentation

# mapzoom.cpp Example File

demos/embedded/lightmaps/mapzoom.cpp

     /****************************************************************************
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     ** Contact: Nokia Corporation (qt-info@nokia.com)
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     ** This file is part of the demonstration applications of the Qt Toolkit.
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     #include <QtGui>
     #include <QtNetwork>
     #include "lightmaps.h"
     #include "mapzoom.h"

     MapZoom::MapZoom()
         : QMainWindow(0)
     {
         map = new LightMaps(this);
         setCentralWidget(map);
         map->setFocus();

         QAction *osloAction = new QAction(tr("&Oslo"), this);
         QAction *berlinAction = new QAction(tr("&Berlin"), this);
         QAction *jakartaAction = new QAction(tr("&Jakarta"), this);
         QAction *nightModeAction = new QAction(tr("Night Mode"), this);
         nightModeAction->setCheckable(true);
         nightModeAction->setChecked(false);
         QAction *osmAction = new QAction(tr("About OpenStreetMap"), this);
         connect(osloAction, SIGNAL(triggered()), SLOT(chooseOslo()));
         connect(berlinAction, SIGNAL(triggered()), SLOT(chooseBerlin()));
         connect(jakartaAction, SIGNAL(triggered()), SLOT(chooseJakarta()));
         connect(nightModeAction, SIGNAL(triggered()), map, SLOT(toggleNightMode()));
         connect(osmAction, SIGNAL(triggered()), SLOT(aboutOsm()));

     #if defined(Q_OS_SYMBIAN) || defined(Q_OS_WINCE_WM)
         menuBar()->addAction(osloAction);
         menuBar()->addAction(berlinAction);
         menuBar()->addAction(jakartaAction);
         menuBar()->addAction(nightModeAction);
         menuBar()->addAction(osmAction);
     #else
         QMenu *menu = menuBar()->addMenu(tr("&Options"));
         menu->addAction(osloAction);
         menu->addAction(berlinAction);
         menu->addAction(jakartaAction);
         menu->addSeparator();
         menu->addAction(nightModeAction);
         menu->addAction(osmAction);
     #endif

         QNetworkConfigurationManager manager;
         if (manager.capabilities() & QNetworkConfigurationManager::NetworkSessionRequired) {
             // Get saved network configuration
             QSettings settings(QSettings::UserScope, QLatin1String("Trolltech"));
             settings.beginGroup(QLatin1String("QtNetwork"));
             const QString id =
                 settings.value(QLatin1String("DefaultNetworkConfiguration")).toString();
             settings.endGroup();

             // If the saved network configuration is not currently discovered use the system
             // default
             QNetworkConfiguration config = manager.configurationFromIdentifier(id);
             if ((config.state() & QNetworkConfiguration::Discovered) !=
                 QNetworkConfiguration::Discovered) {
                 config = manager.defaultConfiguration();
             }

             networkSession = new QNetworkSession(config, this);
             connect(networkSession, SIGNAL(opened()), this, SLOT(sessionOpened()));

             networkSession->open();
         } else {
             networkSession = 0;
         }

         setWindowTitle(tr("Light Maps"));
     }

     void MapZoom::sessionOpened()
     {
         // Save the used configuration
         QNetworkConfiguration config = networkSession->configuration();
         QString id;
         if (config.type() == QNetworkConfiguration::UserChoice) {
             id = networkSession->sessionProperty(
                     QLatin1String("UserChoiceConfiguration")).toString();
         } else {
             id = config.identifier();
         }

         QSettings settings(QSettings::UserScope, QLatin1String("Trolltech"));
         settings.beginGroup(QLatin1String("QtNetwork"));
         settings.setValue(QLatin1String("DefaultNetworkConfiguration"), id);
         settings.endGroup();
     }

     void MapZoom::chooseOslo()
     {
         map->setCenter(59.9138204, 10.7387413);
     }

     void MapZoom::chooseBerlin()
     {
         map->setCenter(52.52958999943302, 13.383053541183472);
     }

     void MapZoom::chooseJakarta()
     {
         map->setCenter(-6.211544, 106.845172);
     }

     void MapZoom::aboutOsm()
     {
         QDesktopServices::openUrl(QUrl("http://www.openstreetmap.org"));
     }