satellitemodel.cpp Example File

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#include "satellitemodel.h" #include <QTimer> #include <QDebug> SatelliteModel::SatelliteModel(QObject *parent) : QAbstractListModel(parent), source(0), m_componentCompleted(false), m_running(false), m_runningRequested(false), demo(false), isSingle(false), singleRequestServed(false) { source = QGeoSatelliteInfoSource::createDefaultSource(this); if (!demo && !source) { qWarning() << "No satellite data source found. Changing to demo mode."; demo = true; } if (!demo) { source->setUpdateInterval(3000); connect(source, SIGNAL(satellitesInViewUpdated(QList<QGeoSatelliteInfo>)), this, SLOT(satellitesInViewUpdated(QList<QGeoSatelliteInfo>))); connect(source, SIGNAL(satellitesInUseUpdated(QList<QGeoSatelliteInfo>)), this, SLOT(satellitesInUseUpdated(QList<QGeoSatelliteInfo>))); connect(source, SIGNAL(error(QGeoSatelliteInfoSource::Error)), this, SLOT(error(QGeoSatelliteInfoSource::Error))); } if (demo) { timer = new QTimer(this); connect(timer, SIGNAL(timeout()), this, SLOT(updateDemoData())); timer->start(3000); } } int SatelliteModel::rowCount(const QModelIndex &parent) const { Q_UNUSED(parent); if (!source && !demo) return 0; return knownSatellites.count(); } QVariant SatelliteModel::data(const QModelIndex &index, int role) const { if (!demo && !source) return QVariant(); if (!index.isValid() || index.row() < 0) return QVariant(); if (index.row() >= knownSatellites.count()) { qWarning() << "SatelliteModel: Index out of bound"; return QVariant(); } const QGeoSatelliteInfo &info =; switch (role) { case IdentifierRole: return info.satelliteIdentifier(); case InUseRole: return satellitesInUse.contains(info.satelliteIdentifier()); case SignalStrengthRole: return info.signalStrength(); case ElevationRole: if (!info.hasAttribute(QGeoSatelliteInfo::Elevation)) return QVariant(); return info.attribute(QGeoSatelliteInfo::Elevation); case AzimuthRole: if (!info.hasAttribute(QGeoSatelliteInfo::Azimuth)) return QVariant(); return info.attribute(QGeoSatelliteInfo::Azimuth); default: break; } return QVariant(); } QHash<int, QByteArray> SatelliteModel::roleNames() const { QHash<int, QByteArray> roleNames; roleNames.insert(IdentifierRole, "satelliteIdentifier"); roleNames.insert(InUseRole, "isInUse"); roleNames.insert(SignalStrengthRole, "signalStrength"); roleNames.insert(ElevationRole, "elevation"); roleNames.insert(AzimuthRole, "azimuth"); return roleNames; } void SatelliteModel::componentComplete() { m_componentCompleted = true; if (m_runningRequested) setRunning(true); } bool SatelliteModel::running() const { return m_running; } bool SatelliteModel::isSingleRequest() const { return isSingle; } void SatelliteModel::setSingleRequest(bool single) { if (running()) { qWarning() << "Cannot change single request mode while running"; return; } if (single != isSingle) { //flag changed isSingle = single; emit singleRequestChanged(); } } void SatelliteModel::setRunning(bool isActive) { if (!source && !demo) return; if (!m_componentCompleted) { m_runningRequested = isActive; return; } if (m_running == isActive) return; m_running = isActive; if (m_running) { clearModel(); if (demo) timer->start(2000); else if (isSingleRequest()) source->requestUpdate(10000); else source->startUpdates(); if (demo) singleRequestServed = false; } else { if (demo) timer->stop(); else if (!isSingleRequest()) source->stopUpdates(); } Q_EMIT runningChanged(); } int SatelliteModel::entryCount() const { return knownSatellites.count(); } bool SatelliteModel::canProvideSatelliteInfo() const { return !demo; } void SatelliteModel::clearModel() { beginResetModel(); knownSatelliteIds.clear(); knownSatellites.clear(); satellitesInUse.clear(); endResetModel(); } void SatelliteModel::updateDemoData() { static bool flag = true; QList<QGeoSatelliteInfo> satellites; if (flag) { for (int i = 0; i<5; i++) { QGeoSatelliteInfo info; info.setSatelliteIdentifier(i); info.setSignalStrength(20 + 20*i); satellites.append(info); } } else { for (int i = 0; i<9; i++) { QGeoSatelliteInfo info; info.setSatelliteIdentifier(i*2); info.setSignalStrength(20 + 10*i); satellites.append(info); } } satellitesInViewUpdated(satellites); flag ? satellitesInUseUpdated(QList<QGeoSatelliteInfo>() << : satellitesInUseUpdated(QList<QGeoSatelliteInfo>() <<; flag = !flag; emit errorFound(flag); if (isSingleRequest() && !singleRequestServed) { singleRequestServed = true; setRunning(false); } } void SatelliteModel::error(QGeoSatelliteInfoSource::Error error) { emit errorFound((int)error); } inline bool operator<(const QGeoSatelliteInfo& a, const QGeoSatelliteInfo& b) { return a.satelliteIdentifier() < b.satelliteIdentifier(); } void SatelliteModel::satellitesInViewUpdated(const QList<QGeoSatelliteInfo> &infos) { if (!running()) return; int oldEntryCount = knownSatellites.count(); QSet<int> satelliteIdsInUpdate; foreach (const QGeoSatelliteInfo &info, infos) satelliteIdsInUpdate.insert(info.satelliteIdentifier()); QSet<int> toBeRemoved = knownSatelliteIds - satelliteIdsInUpdate; //We reset the model as in reality just about all entry values change //and there are generally a lot of inserts and removals each time //Hence we don't bother with complex model update logic beyond resetModel() beginResetModel(); knownSatellites = infos; //sort them for presentation purposes std::sort(knownSatellites.begin(), knownSatellites.end()); //remove old "InUse" data //new satellites are by default not in "InUse" //existing satellites keep their "inUse" state satellitesInUse -= toBeRemoved; knownSatelliteIds = satelliteIdsInUpdate; endResetModel(); if (oldEntryCount != knownSatellites.count()) emit entryCountChanged(); } void SatelliteModel::satellitesInUseUpdated(const QList<QGeoSatelliteInfo> &infos) { if (!running()) return; beginResetModel(); satellitesInUse.clear(); foreach (const QGeoSatelliteInfo &info, infos) satellitesInUse.insert(info.satelliteIdentifier()); endResetModel(); }

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