Qt 5.11 | Qt Location | Map Viewer (QML) | main.cpp Example File

Qt 5.11.3 Reference Documentation

# main.cpp Example File

mapviewer/main.cpp

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      ** This file is part of the examples of the Qt Toolkit.
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      #include <QtCore/QTextStream>
      #include <QtGui/QGuiApplication>
      #include <QtQml/QQmlApplicationEngine>
      #include <QtQuick/QQuickItem>

      static bool parseArgs(QStringList& args, QVariantMap& parameters)
      {

          while (!args.isEmpty()) {

              QString param = args.takeFirst();

              if (param.startsWith("--help")) {
                  QTextStream out(stdout);
                  out << "Usage: " << endl;
                  out << "--plugin.<parameter_name> <parameter_value>    -  Sets parameter = value for plugin" << endl;
                  out.flush();
                  return true;
              }

              if (param.startsWith("--plugin.")) {

                  param.remove(0, 9);

                  if (args.isEmpty() || args.first().startsWith("--")) {
                      parameters[param] = true;
                  } else {

                      QString value = args.takeFirst();

                      if (value == "true" || value == "on" || value == "enabled") {
                          parameters[param] = true;
                      } else if (value == "false" || value == "off"
                                 || value == "disable") {
                          parameters[param] = false;
                      } else {
                          parameters[param] = value;
                      }
                  }
              }
          }
          return false;
      }

      int main(int argc, char *argv[])
      {
      #if QT_CONFIG(library)
          const QByteArray additionalLibraryPaths = qgetenv("QTLOCATION_EXTRA_LIBRARY_PATH");
          for (const QByteArray &p : additionalLibraryPaths.split(':'))
              QCoreApplication::addLibraryPath(QString(p));
      #endif
          QGuiApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
          QGuiApplication application(argc, argv);

          QVariantMap parameters;
          QStringList args(QCoreApplication::arguments());

          // Fetch tokens from the environment, if present
          const QByteArray mapboxMapID = qgetenv("MAPBOX_MAP_ID");
          const QByteArray mapboxAccessToken = qgetenv("MAPBOX_ACCESS_TOKEN");
          const QByteArray hereAppID = qgetenv("HERE_APP_ID");
          const QByteArray hereToken = qgetenv("HERE_TOKEN");
          const QByteArray esriToken = qgetenv("ESRI_TOKEN");

          if (!mapboxMapID.isEmpty())
              parameters["mapbox.map_id"] = QString::fromLocal8Bit(mapboxMapID);
          if (!mapboxAccessToken.isEmpty()) {
              parameters["mapbox.access_token"] = QString::fromLocal8Bit(mapboxAccessToken);
              parameters["mapboxgl.access_token"] = QString::fromLocal8Bit(mapboxAccessToken);
          }
          if (!hereAppID.isEmpty())
              parameters["here.app_id"] = QString::fromLocal8Bit(hereAppID);
          if (!hereToken.isEmpty())
              parameters["here.token"] = QString::fromLocal8Bit(hereToken);
          if (!esriToken.isEmpty())
              parameters["esri.token"] = QString::fromLocal8Bit(esriToken);

          if (parseArgs(args, parameters))
              return 0;
          if (!args.contains(QStringLiteral("osm.useragent")))
              parameters[QStringLiteral("osm.useragent")] = QStringLiteral("QtLocation Mapviewer example");

          QQmlApplicationEngine engine;
          engine.addImportPath(QStringLiteral(":/imports"));
          engine.load(QUrl(QStringLiteral("qrc:///mapviewer.qml")));
          QObject::connect(&engine, SIGNAL(quit()), qApp, SLOT(quit()));

          QObject *item = engine.rootObjects().first();
          Q_ASSERT(item);

          QMetaObject::invokeMethod(item, "initializeProviders",
                                    Q_ARG(QVariant, QVariant::fromValue(parameters)));

          return application.exec();
      }