/**************************************************************************** ** ** Copyright (C) 2016 The Qt Company Ltd. ** Contact: https://www.qt.io/licensing/ ** ** This file is part of the QtPositioning module 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 https://www.qt.io/terms-conditions. For further ** information use the contact form at https://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 3 as published by the Free Software ** Foundation and appearing in the file LICENSE.LGPL3 included in the ** packaging of this file. Please review the following information to ** ensure the GNU Lesser General Public License version 3 requirements ** will be met: https://www.gnu.org/licenses/lgpl-3.0.html. ** ** GNU General Public License Usage ** Alternatively, this file may be used under the terms of the GNU ** General Public License version 2.0 or (at your option) the GNU General ** Public license version 3 or any later version approved by the KDE Free ** Qt Foundation. The licenses are as published by the Free Software ** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3 ** included in the packaging of this file. Please review the following ** information to ensure the GNU General Public License requirements will ** be met: https://www.gnu.org/licenses/gpl-2.0.html and ** https://www.gnu.org/licenses/gpl-3.0.html. ** ** $QT_END_LICENSE$ ** ****************************************************************************/ #include #include "qgeopositioninfosourcefactory.h" #include "qgeopositioninfosource_p.h" /*! \class QGeoAreaMonitorSource \inmodule QtPositioning \ingroup QtPositioning-positioning \since 5.2 \brief The QGeoAreaMonitorSource class enables the detection of proximity changes for a specified set of coordinates. A QGeoAreaMonitorSource emits signals when the current position is in range, or has moved out of range, of a specified area. Each area is specified by a \l QGeoAreaMonitorInfo object. For example: \snippet cpp/cppqml.cpp BigBen \c QGeoAreaMonitorSource follows a singleton pattern. Each instance of the class with the same \l sourceName() shares the same area monitoring backend. If a new \l QGeoAreaMonitorInfo object is added via \l startMonitoring() or \l requestUpdate() it can be retrieved by another instance of this class (provided that they are sourced from the same area monitor provider plug-in). The same singleton pattern applies to the \l QGeoPositionInfoSource instance used by this class. The following code snippet emphasizes the behavior: \code QGeoAreaMonitorSource *s1 = QGeoAreaMonitorSource::createSource("blah", this); QGeoAreaMonitorSource *s2 = QGeoAreaMonitorSource::createSource("blah", this); QVERIFY(s1->positionInfoSource() == s2->positionInfoSource); \endcode */ QT_BEGIN_NAMESPACE class QGeoAreaMonitorSourcePrivate { public: QGeoPositionInfoSource *source; QString providerName; }; /*! \enum QGeoAreaMonitorSource::Error Defines the types of positioning methods. The Error enumeration represents the errors which can occur. \value AccessError The connection setup to the remote area monitoring backend failed because the application lacked the required privileges. \value InsufficientPositionInfo The area monitoring source could not retrieve a location fix or the accuracy of the fix is not high enough to provide an effective area monitoring. \value NoError No error has occurred. \value UnknownSourceError An unidentified error occurred. */ /*! \enum QGeoAreaMonitorSource::AreaMonitorFeature Defines the types of area monitoring capabilities. \value PersistentAreaMonitorFeature QGeoAreaMonitorInfo instances can be made persistent. A persistent monitor continues to be active even when the application managing the monitor is not running. \value AnyAreaMonitorFeature Matches all possible area monitoring features. */ /*! \fn virtual AreaMonitoringFeatures QGeoAreaMonitorSource::supportedAreaMonitorFeatures() const = 0; Returns the area monitoring features available to this source. */ /*! \fn virtual QGeoAreaMonitorSource::Error QGeoAreaMonitorSource::error() const Returns the type of error that last occurred. */ /*! Creates a monitor with the given \a parent. */ QGeoAreaMonitorSource::QGeoAreaMonitorSource(QObject *parent) : QObject(parent), d(new QGeoAreaMonitorSourcePrivate) { d->source = 0; } /*! Destroys the monitor. */ QGeoAreaMonitorSource::~QGeoAreaMonitorSource() { delete d; } /*! Creates and returns a monitor with the given \a parent that monitors areas using resources on the underlying system. Returns 0 if the system has no support for position monitoring. */ QGeoAreaMonitorSource *QGeoAreaMonitorSource::createDefaultSource(QObject *parent) { QList plugins = QGeoPositionInfoSourcePrivate::pluginsSorted(); foreach (const QJsonObject &obj, plugins) { if (obj.value(QStringLiteral("Monitor")).isBool() && obj.value(QStringLiteral("Monitor")).toBool()) { QGeoPositionInfoSourcePrivate d; d.metaData = obj; d.loadPlugin(); QGeoAreaMonitorSource *s = 0; if (d.factory) s = d.factory->areaMonitor(parent); if (s) s->d->providerName = d.metaData.value(QStringLiteral("Provider")).toString(); return s; } } return 0; } /*! Creates and returns a monitor with the given \a parent, by loading the plugin named \a sourceName. Returns 0 if the plugin cannot be found. */ QGeoAreaMonitorSource *QGeoAreaMonitorSource::createSource(const QString &sourceName, QObject *parent) { QHash plugins = QGeoPositionInfoSourcePrivate::plugins(); if (plugins.contains(sourceName)) { QGeoPositionInfoSourcePrivate d; d.metaData = plugins.value(sourceName); d.loadPlugin(); QGeoAreaMonitorSource *s = 0; if (d.factory) s = d.factory->areaMonitor(parent); if (s) s->d->providerName = d.metaData.value(QStringLiteral("Provider")).toString(); return s; } return 0; } /*! Returns a list of available monitor plugins, including the default system backend if one is available. */ QStringList QGeoAreaMonitorSource::availableSources() { QStringList plugins; const QHash meta = QGeoPositionInfoSourcePrivate::plugins(); for (auto it = meta.cbegin(), end = meta.cend(); it != end; ++it) { if (it.value().value(QStringLiteral("Monitor")).isBool() && it.value().value(QStringLiteral("Monitor")).toBool()) { plugins << it.key(); } } return plugins; } /*! Returns the unique name of the area monitor source implementation in use. This is the same name that can be passed to createSource() in order to create a new instance of a particular area monitor source implementation. */ QString QGeoAreaMonitorSource::sourceName() const { return d->providerName; } /*! Returns the current QGeoPositionInfoSource used by this QGeoAreaMonitorSource object. The function will return \l QGeoPositionInfoSource::createDefaultSource() if no other object has been set. The function returns 0 if not even a default QGeoPositionInfoSource exists. Any usage of the returned \l QGeoPositionInfoSource instance should account for the fact that it may reside in a different thread. \sa QGeoPositionInfoSource, setPositionInfoSource() */ QGeoPositionInfoSource* QGeoAreaMonitorSource::positionInfoSource() const { return d->source; } /*! Sets the new \l QGeoPositionInfoSource to be used by this QGeoAreaMonitorSource object. The area monitoring backend becomes the new QObject parent for \a newSource. The previous \l QGeoPositionInfoSource object will be deleted. All QGeoAreaMonitorSource instances based on the same \l sourceName() share the same QGeoPositionInfoSource instance. This may be useful when it is desirable to manipulate the positioning system used by the area monitoring engine. Note that ownership must be taken care of by subclasses of QGeoAreaMonitorSource. Due to the singleton pattern behind this class \a newSource may be moved to a new thread. \sa positionInfoSource() */ void QGeoAreaMonitorSource::setPositionInfoSource(QGeoPositionInfoSource *newSource) { d->source = newSource; } /*! \fn virtual bool QGeoAreaMonitorSource::startMonitoring(const QGeoAreaMonitorInfo &monitor) Returns \c true if the monitoring of \a monitor could be successfully started; otherwise returns false. A reason for not being able to start monitoring could be the unavailability of an appropriate default position info source while no alternative QGeoPositionInfoSource has been set via \l setPositionInfoSource(). If \a monitor is already active the existing monitor object will be replaced by the new \a monitor reference. The identification of QGeoAreaMonitorInfo instances happens via \l QGeoAreaMonitorInfo::identifier(). Therefore this function can also be used to update active monitors. If \a monitor has an expiry date that has been passed this function returns false. Calling this function for an already via \l requestUpdate() registered single shot monitor switches the monitor to a permanent monitoring mode. Requesting persistent monitoring on a QGeoAreaMonitorSource instance fails if the area monitoring backend doesn't support \l QGeoAreaMonitorSource::PersistentAreaMonitorFeature. \sa stopMonitoring() */ /*! \fn virtual bool QGeoAreaMonitorSource::requestUpdate(const QGeoAreaMonitorInfo &monitor, const char *signal) Enables single shot area monitoring. Area monitoring for \a monitor will be performed until this QGeoAreaMonitorSource instance emits \a signal for the first time. Once the signal was emitted, \a monitor is automatically removed from the list of \l activeMonitors(). If \a monitor is invalid or has an expiry date that has been passed this function returns false. \code QGeoAreaMonitor singleShotMonitor; QGeoAreaMonitorSource * source = QGeoAreaMonitorSource::createDefaultSource(this); //... bool ret = source->requestUpdate(singleShotMonitor, SIGNAL(areaExited(QGeoAreaMonitor,QGeoPositionInfo))); \endcode The above \c singleShotMonitor object will cease to send updates once the \l areaExited() signal was emitted for the first time. Until this point in time any other signal may be emitted zero or more times depending on the area context. It is not possible to simultanously request updates for more than one signal of the same monitor object. The last call to this function determines the signal upon which the updates cease to continue. At this stage only the \l areaEntered() and \l areaExited() signals can be used to terminate the monitoring process. Requesting persistent monitoring on a QGeoAreaMonitorSource instance fails if the area monitoring backend doesn't support \l QGeoAreaMonitorSource::PersistentAreaMonitorFeature. If \a monitor was already registered via \l startMonitoring() it is converted to a single shot behavior. \sa startMonitoring(), stopMonitoring() */ /*! \fn virtual bool QGeoAreaMonitorSource::stopMonitoring(const QGeoAreaMonitorInfo &monitor) Returns true if \a monitor was successfully removed from the list of \l activeMonitors(); otherwise returns false. This behavior is independent on whether \a monitor was registered via \l startMonitoring() or \l requestUpdate(). */ /*! \fn virtual QList QGeoAreaMonitorSource::activeMonitors() const Returns the list of all active monitors known to the QGeoAreaMonitorSource object. An active monitor was started via startMonitoring() the source object will emit the required signals such as areaEntered() or areaExited(). Multiple \l QGeoAreaMonitorSource instances within the same application share the same active monitor objects. Unless an active QGeoAreaMonitorInfo \l {QGeoAreaMonitorInfo::isPersistent()}{isPersistent()} an active QGeoAreaMonitorInfo will be stopped once the current application terminates. */ /*! \fn virtual QList QGeoAreaMonitorSource::activeMonitors(const QGeoShape &lookupArea) const Returns the list of all active monitors known to the QGeoAreaMonitorSource object whose center lies within \a lookupArea. If \a lookupArea is empty the returned list will be empty. An active monitor was started via startMonitoring() and the source object will emit the required signals such as areaEntered() or areaExited(). Multiple QGeoAreaMonitorSource instances within the same application share the same monitor objects. Unless an active QGeoAreaMonitorInfo \l {QGeoAreaMonitorInfo::isPersistent()}{isPersistent()} an active QGeoAreaMonitorInfo will be stopped once the current application terminates. \sa QGeoShape */ /*! \fn void QGeoAreaMonitorSource::monitorExpired(const QGeoAreaMonitorInfo &monitor) Emitted when \a monitor has expired. An expired area monitor is automatically removed from the list of \l activeMonitors(). \sa activeMonitors() */ /*! \fn void QGeoAreaMonitorSource::areaEntered(const QGeoAreaMonitorInfo &monitor, const QGeoPositionInfo &update) Emitted when the current position has moved from a position outside of the active \a monitor to a position within the monitored area. The \a update holds the new position. */ /*! \fn void QGeoAreaMonitorSource::areaExited(const QGeoAreaMonitorInfo &monitor, const QGeoPositionInfo &update) Emitted when the current position has moved from a position within the active \a monitor to a position outside the monitored area. The \a update holds the new position. */ /*! \fn void QGeoAreaMonitorSource::error(QGeoAreaMonitorSource::Error areaMonitoringError) This signal is emitted after an error occurred. The \a areaMonitoringError parameter describes the type of error that occurred. */ QT_END_NAMESPACE