Qt 5.6 | Qt Sensors | Qt Sensors - Explorer QML Example | explorer.cpp Example File

Qt 5.6.3 Reference Documentation

# explorer.cpp Example File

sensor_explorer/import/explorer.cpp

      /****************************************************************************
      **
      ** Copyright (C) 2015 The Qt Company Ltd.
      ** Contact: http://www.qt.io/licensing/
      **
      ** This file is part of the QtSensors module of the Qt Toolkit.
      **
      ** $QT_BEGIN_LICENSE:LGPL21$
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      ** GNU Lesser General Public License Usage
      ** Alternatively, this file may be used under the terms of the GNU Lesser
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      ** LICENSE.LGPLv3 included in the packaging of this file. Please review the
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      #include "explorer.h"
      #include <QtCore/QDebug>
      #include <qsensor.h>
      #include <QMetaObject>
      #include <QMetaProperty>

      /*
          \class QSensorExplorer
          \brief The QSensorExplorer type provides an easy access for reading all avalaible sensors installed on the system.
      */

      /*
          Construct a QSensorExplorer object with parent \a parent
      */
      QSensorExplorer::QSensorExplorer(QObject* parent)
          : QObject(parent)
          , _selectedSensorItem(0)
      {
          loadSensors();
      }

      /*
          Destructor of a QSensorExplorer
      */
      QSensorExplorer::~QSensorExplorer()
      {
      }

      /*
          Load all available sensors and store it in a list.
      */
      void QSensorExplorer::loadSensors()
      {
          _availableSensors.clear();

          foreach (const QByteArray &type, QSensor::sensorTypes()) {
              qDebug() << "Found type" << type;
              foreach (const QByteArray &identifier, QSensor::sensorsForType(type)) {
                  qDebug() << "Found identifier" << identifier;
                  // Don't put in sensors we can't connect to
                  QSensor* sensor = new QSensor(type, this);
                  sensor->setIdentifier(identifier);
                  if (!sensor->connectToBackend()) {
                      qDebug() << "Couldn't connect to" << identifier;
                      continue;
                  }

                  qDebug() << "Adding identifier" << identifier;
                  _availableSensors.append(new QSensorItem(sensor, this));
              }
          }
          emit availableSensorsChanged();
      }

      /*
          \fn QSensorExplorer::availableSensorsChanged()
          Notifies the client if the list of the available sensors was changed
      */

      /*
          \property QSensorExplorer::availableSensors
          Returns a list of all available sensor.
      */
      QQmlListProperty<QSensorItem> QSensorExplorer::availableSensors()
      {
          return QQmlListProperty<QSensorItem>(this,_availableSensors);
      }

      /*
          \fn QSensorExplorer::selectedSensorItemChanged()
          Notifies the client if the selected sensor has been changed
      */

      /*
          \property QSensorExplorer::selectedSensorItem
          Returns the current selected sensor item.
      */
      QSensorItem* QSensorExplorer::selectedSensorItem()
      {
          return _selectedSensorItem;
      }

      /*
          \fn QSensorExplorer::setSelectedSensorItem(QSensorItem* selitem)
          Sets the QSensorItem \a selitem as the current selected QSensorItem.
      */
      void QSensorExplorer::setSelectedSensorItem(QSensorItem* selitem)
      {
          if (selitem  && _selectedSensorItem != selitem) {
              if (_selectedSensorItem)
                  _selectedSensorItem->unSelect();
              _selectedSensorItem = selitem;
              _selectedSensorItem->select();
              emit selectedSensorItemChanged();
          }
      }