Qt Reference Documentation

- Qt 4.8
- ALL VERSIONS

- A
- A
- A
- Print

# mapzoom.cpp Example File

demos/embedded/lightmaps/mapzoom.cpp

     /****************************************************************************
     **
     ** Copyright (C) 2015 The Qt Company Ltd.
     ** Contact: http://www.qt.io/licensing/
     **
     ** This file is part of the demonstration applications of the Qt Toolkit.
     **
     ** $QT_BEGIN_LICENSE:LGPL$
     ** Commercial License Usage
     ** Licensees holding valid commercial Qt licenses may use this file in
     ** accordance with the commercial license agreement provided with the
     ** Software or, alternatively, in accordance with the terms contained in
     ** a written agreement between you and The Qt Company. For licensing terms
     ** and conditions see http://www.qt.io/terms-conditions. For further
     ** information use the contact form at http://www.qt.io/contact-us.
     **
     ** GNU Lesser General Public License Usage
     ** Alternatively, this file may be used under the terms of the GNU Lesser
     ** General Public License version 2.1 or version 3 as published by the Free
     ** Software Foundation and appearing in the file LICENSE.LGPLv21 and
     ** LICENSE.LGPLv3 included in the packaging of this file. Please review the
     ** following information to ensure the GNU Lesser General Public License
     ** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
     ** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
     **
     ** As a special exception, The Qt Company gives you certain additional
     ** rights. These rights are described in The Qt Company LGPL Exception
     ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
     **
     ** GNU General Public License Usage
     ** Alternatively, this file may be used under the terms of the GNU
     ** General Public License version 3.0 as published by the Free Software
     ** Foundation and appearing in the file LICENSE.GPL included in the
     ** packaging of this file.  Please review the following information to
     ** ensure the GNU General Public License version 3.0 requirements will be
     ** met: http://www.gnu.org/copyleft/gpl.html.
     **
     ** $QT_END_LICENSE$
     **
     ****************************************************************************/

     #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"));
     }