#include <qgeoareamonitor_polling.h>

Inheritance diagram for QGeoAreaMonitorPolling:

Collaboration diagram for QGeoAreaMonitorPolling:

Public Member Functions
	QGeoAreaMonitorPolling (QObject *parent=0)
	~QGeoAreaMonitorPolling ()
void	setPositionInfoSource (QGeoPositionInfoSource *source) override
	Sets the new \l QGeoPositionInfoSource to be used by this QGeoAreaMonitorSource object.
QGeoPositionInfoSource *	positionInfoSource () const override
	Returns the current QGeoPositionInfoSource used by this QGeoAreaMonitorSource object.
Error	error () const override
	Returns the type of error that last occurred.
bool	startMonitoring (const QGeoAreaMonitorInfo &monitor) override
	Returns `true` if the monitoring of monitor could be successfully started; otherwise returns `false`.
bool	requestUpdate (const QGeoAreaMonitorInfo &monitor, const char *signal) override
	Enables single shot area monitoring.
bool	stopMonitoring (const QGeoAreaMonitorInfo &monitor) override
	Returns true if monitor was successfully removed from the list of \l activeMonitors(); otherwise returns false.
QList< QGeoAreaMonitorInfo >	activeMonitors () const override
	Returns the list of all active monitors known to the QGeoAreaMonitorSource object.
QList< QGeoAreaMonitorInfo >	activeMonitors (const QGeoShape &region) const override
	Returns the list of all active monitors known to the QGeoAreaMonitorSource object whose center lies within lookupArea.
QGeoAreaMonitorSource::AreaMonitorFeatures	supportedAreaMonitorFeatures () const override
	Returns the area monitoring features available to this source.
bool	isValid ()
Public Member Functions inherited from QGeoAreaMonitorSource
	QGeoAreaMonitorSource (QObject *parent)
	Creates a monitor source with the given parent.
virtual	~QGeoAreaMonitorSource ()
	Destroys the monitor source.
QString	sourceName () const
	Returns the unique name of the area monitor source implementation in use.
virtual bool	setBackendProperty (const QString &name, const QVariant &value)
virtual QVariant	backendProperty (const QString &name) const
Public Member Functions inherited from QObject
Q_INVOKABLE	QObject (QObject *parent=nullptr)
	Constructs an object with parent object parent.
virtual	~QObject ()
	Destroys the object, deleting all its child objects.
virtual bool	event (QEvent *event)
	This virtual function receives events to an object and should return true if the event e was recognized and processed.
virtual bool	eventFilter (QObject watched, QEvent event)
	Filters events if this object has been installed as an event filter for the watched object.
QString	objectName () const
Q_WEAK_OVERLOAD void	setObjectName (const QString &name)
	Sets the object's name to name.
void	setObjectName (QAnyStringView name)
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.
QBindable< QString >	bindableObjectName ()
bool	isWidgetType () const
	Returns `true` if the object is a widget; otherwise returns `false`.
bool	isWindowType () const
	Returns `true` if the object is a window; otherwise returns `false`.
bool	isQuickItemType () const
	Returns `true` if the object is a QQuickItem; otherwise returns `false`.
bool	isQmlObjectType () const
	Returns whether the object has been created by the QML engine or ownership has been explicitly set via QJSEngine::setObjectOwnership().
bool	signalsBlocked () const noexcept
	Returns `true` if signals are blocked; otherwise returns `false`.
bool	blockSignals (bool b) noexcept
	If block is true, signals emitted by this object are blocked (i.e., emitting a signal will not invoke anything connected to it).
QThread *	thread () const
	Returns the thread in which the object lives.
bool	moveToThread (QThread *thread QT6_DECL_NEW_OVERLOAD_TAIL)
	Changes the thread affinity for this object and its children and returns `true` on success.
int	startTimer (int interval, Qt::TimerType timerType=Qt::CoarseTimer)
	This is an overloaded function that will start a timer of type timerType and a timeout of interval milliseconds.
int	startTimer (std::chrono::nanoseconds time, Qt::TimerType timerType=Qt::CoarseTimer)
void	killTimer (int id)
	Kills the timer with timer identifier, id.
void	killTimer (Qt::TimerId id)
template<typename T>
T	findChild (QAnyStringView aName, Qt::FindChildOptions options=Qt::FindChildrenRecursively) const
	Returns the child of this object that can be cast into type T and that is called name, or \nullptr if there is no such object.
template<typename T>
QList< T >	findChildren (QAnyStringView aName, Qt::FindChildOptions options=Qt::FindChildrenRecursively) const
	Returns all children of this object with the given name that can be cast to type T, or an empty list if there are no such objects.
template<typename T>
T	findChild (Qt::FindChildOptions options=Qt::FindChildrenRecursively) const
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.
template<typename T>
QList< T >	findChildren (Qt::FindChildOptions options=Qt::FindChildrenRecursively) const
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.
const QObjectList &	children () const
	Returns a list of child objects.
void	setParent (QObject *parent)
	Makes the object a child of parent.
void	installEventFilter (QObject *filterObj)
	Installs an event filter filterObj on this object.
void	removeEventFilter (QObject *obj)
	Removes an event filter object obj from this object.
QMetaObject::Connection	connect (const QObject sender, const char signal, const char *member, Qt::ConnectionType type=Qt::AutoConnection) const
bool	disconnect (const char signal=nullptr, const QObject receiver=nullptr, const char *member=nullptr) const
bool	disconnect (const QObject receiver, const char member=nullptr) const
void	dumpObjectTree () const
	Dumps a tree of children to the debug output.
void	dumpObjectInfo () const
	Dumps information about signal connections, etc.
bool	setProperty (const char *name, const QVariant &value)
	Sets the value of the object's name property to value.
bool	setProperty (const char *name, QVariant &&value)
QVariant	property (const char *name) const
	Returns the value of the object's name property.
QList< QByteArray >	dynamicPropertyNames () const
QBindingStorage *	bindingStorage ()
const QBindingStorage *	bindingStorage () const
QObject *	parent () const
	Returns a pointer to the parent object.
bool	inherits (const char *classname) const
	Returns `true` if this object is an instance of a class that inherits className or a QObject subclass that inherits className; otherwise returns `false`.

Private Member Functions
void	connectNotify (const QMetaMethod &signal) override
void	disconnectNotify (const QMetaMethod &signal) override

Friends
class	QGeoAreaMonitorPollingPrivate

Additional Inherited Members
Public Types inherited from QGeoAreaMonitorSource
enum	Error { AccessError = 0 , InsufficientPositionInfo = 1 , UnknownSourceError = 2 , NoError = 3 }
	Defines the types of positioning methods. More...
enum	AreaMonitorFeature { PersistentAreaMonitorFeature = 0x00000001 , AnyAreaMonitorFeature = 0xffffffff }
	Defines the types of area monitoring capabilities. More...
Public Slots inherited from QObject
void	deleteLater ()
	\threadsafe
Signals inherited from QGeoAreaMonitorSource
void	areaEntered (const QGeoAreaMonitorInfo &monitor, const QGeoPositionInfo &update)
	Emitted when the current position has moved from a position outside of the active monitor to a position within the monitored area.
void	areaExited (const QGeoAreaMonitorInfo &monitor, const QGeoPositionInfo &update)
	Emitted when the current position has moved from a position within the active monitor to a position outside the monitored area.
void	monitorExpired (const QGeoAreaMonitorInfo &monitor)
	Emitted when monitor has expired.
void	errorOccurred (QGeoAreaMonitorSource::Error error)
	This signal is emitted after an error occurred.
Signals inherited from QObject
void	destroyed (QObject *=nullptr)
	This signal is emitted immediately before the object obj is destroyed, after any instances of QPointer have been notified, and cannot be blocked.
void	objectNameChanged (const QString &objectName, QPrivateSignal)
	This signal is emitted after the object's name has been changed.
Static Public Member Functions inherited from QGeoAreaMonitorSource
static QGeoAreaMonitorSource *	createDefaultSource (QObject *parent)
	Creates and returns a monitor source with the given parent that monitors areas using resources on the underlying system.
static QGeoAreaMonitorSource *	createSource (const QString &sourceName, QObject *parent)
	Creates and returns a monitor source with the given parent, by loading the plugin named sourceName.
static QStringList	availableSources ()
	Returns a list of available monitor plugins, including the default system backend if one is available.
Static Public Member Functions inherited from QObject
static QMetaObject::Connection	connect (const QObject sender, const char signal, const QObject receiver, const char member, Qt::ConnectionType=Qt::AutoConnection)
	\threadsafe
static QMetaObject::Connection	connect (const QObject sender, const QMetaMethod &signal, const QObject receiver, const QMetaMethod &method, Qt::ConnectionType type=Qt::AutoConnection)
template<typename Func1, typename Func2>
static QMetaObject::Connection	connect (const typename QtPrivate::FunctionPointer< Func1 >::Object sender, Func1 signal, const typename QtPrivate::ContextTypeForFunctor< Func2 >::ContextType context, Func2 &&slot, Qt::ConnectionType type=Qt::AutoConnection)
template<typename Func1, typename Func2>
static QMetaObject::Connection	connect (const typename QtPrivate::FunctionPointer< Func1 >::Object *sender, Func1 signal, Func2 &&slot)
static bool	disconnect (const QObject sender, const char signal, const QObject receiver, const char member)
	\threadsafe
static bool	disconnect (const QObject sender, const QMetaMethod &signal, const QObject receiver, const QMetaMethod &member)
static bool	disconnect (const QMetaObject::Connection &)
	Disconnect a connection.
template<typename Func1, typename Func2>
static bool	disconnect (const typename QtPrivate::FunctionPointer< Func1 >::Object sender, Func1 signal, const typename QtPrivate::FunctionPointer< Func2 >::Object receiver, Func2 slot)
template<typename Func1>
static bool	disconnect (const typename QtPrivate::FunctionPointer< Func1 >::Object sender, Func1 signal, const QObject receiver, void **zero)
Protected Member Functions inherited from QObject
QObject *	sender () const
	Returns a pointer to the object that sent the signal, if called in a slot activated by a signal; otherwise it returns \nullptr.
int	senderSignalIndex () const
int	receivers (const char *signal) const
	Returns the number of receivers connected to the signal.
bool	isSignalConnected (const QMetaMethod &signal) const
virtual void	timerEvent (QTimerEvent *event)
	This event handler can be reimplemented in a subclass to receive timer events for the object.
virtual void	childEvent (QChildEvent *event)
	This event handler can be reimplemented in a subclass to receive child events.
virtual void	customEvent (QEvent *event)
	This event handler can be reimplemented in a subclass to receive custom events.
	QObject (QObjectPrivate &dd, QObject *parent=nullptr)
Protected Attributes inherited from QObject
QScopedPointer< QObjectData >	d_ptr
Properties inherited from QObject
QString	objectName
	the name of this object
Related Symbols inherited from QObject
template< class T > T	qobject_cast (const QObject *object)
	Returns the given object cast to type T if the object is of type T (or of a subclass); otherwise returns \nullptr.
template< typename T > T	qFindChildqFindChildren (const QObject *obj, const QString &name)()
template< typename T > QList< T >	qFindChildrenqFindChildren (const QObject *obj, const QString &name)()
	QObjectList
	\macro Q_CLASSINFO(Name, Value)

Detailed Description

Definition at line 19 of file qgeoareamonitor_polling.h.

Constructor & Destructor Documentation

◆ QGeoAreaMonitorPolling()

QGeoAreaMonitorPolling::QGeoAreaMonitorPolling ( QObject * parent = 0 )

explicit

Definition at line 288 of file qgeoareamonitor_polling.cpp.

References QObjectData::parent.

◆ ~QGeoAreaMonitorPolling()

QGeoAreaMonitorPolling::~QGeoAreaMonitorPolling ( )

Definition at line 297 of file qgeoareamonitor_polling.cpp.

Member Function Documentation

◆ activeMonitors() [1/2]

QList< QGeoAreaMonitorInfo > QGeoAreaMonitorPolling::activeMonitors ( ) const

overridevirtual

Returns the list of all active monitors known to the QGeoAreaMonitorSource object.

An active monitor was started via startMonitoring(). For every active monitor 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.

Implements QGeoAreaMonitorSource.

Definition at line 395 of file qgeoareamonitor_polling.cpp.

◆ activeMonitors() [2/2]

QList< QGeoAreaMonitorInfo > QGeoAreaMonitorPolling::activeMonitors ( const QGeoShape & lookupArea ) const

overridevirtual

Returns the list of all active monitors known to the QGeoAreaMonitorSource object whose center lies within lookupArea.

If lookupArea is empty the returned list will be empty.

An active monitor was started via startMonitoring(). For every active monitor 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.

See also: QGeoShape

Implements QGeoAreaMonitorSource.

Definition at line 400 of file qgeoareamonitor_polling.cpp.

◆ connectNotify()

void QGeoAreaMonitorPolling::connectNotify ( const QMetaMethod & signal )

overrideprivatevirtual

Since: 5.0

This virtual function is called when something has been connected to signal in this object.

If you want to compare signal with a specific signal, you can use QMetaMethod::fromSignal() as follows:

        if (signal == QMetaMethod::fromSignal(&MyObject::valueChanged)) {
            // signal is valueChanged
        }

Warning: This function violates the object-oriented principle of modularity. However, it might be useful when you need to perform an expensive operation only if something is connected to a signal.; This function is called from the thread which performs the connection, which may be a different thread from the thread in which this object lives. This function may also be called with a QObject internal mutex locked. It is therefore not allowed to re-enter any QObject functions, including isSignalConnected(), from your reimplementation. If you lock a mutex in your reimplementation, make sure that you don't call QObject functions with that mutex held in other places or it will result in a deadlock.

See also: connect(), disconnectNotify()

Reimplemented from QObject.

Definition at line 420 of file qgeoareamonitor_polling.cpp.

◆ disconnectNotify()

void QGeoAreaMonitorPolling::disconnectNotify ( const QMetaMethod & signal )

overrideprivatevirtual

Since: 5.0

This virtual function is called when something has been disconnected from signal in this object.

See connectNotify() for an example of how to compare signal with a specific signal.

If all signals were disconnected from this object (e.g., the signal argument to disconnect() was \nullptr), disconnectNotify() is only called once, and the signal will be an invalid QMetaMethod (QMetaMethod::isValid() returns false).

Warning: This function violates the object-oriented principle of modularity. However, it might be useful for optimizing access to expensive resources.; This function is called from the thread which performs the disconnection, which may be a different thread from the thread in which this object lives. This function may also be called with a QObject internal mutex locked. It is therefore not allowed to re-enter any QObject functions, including isSignalConnected(), from your reimplementation. If you lock a mutex in your reimplementation, make sure that you don't call QObject functions with that mutex held in other places or it will result in a deadlock.

See also: disconnect(), connectNotify()

Reimplemented from QObject.

Definition at line 431 of file qgeoareamonitor_polling.cpp.

◆ error()

QGeoAreaMonitorSource::Error QGeoAreaMonitorPolling::error ( ) const

overridevirtual

Returns the type of error that last occurred.

Note: Since Qt6 the last error is always reset when calling startMonitoring() or requestUpdate().

Implements QGeoAreaMonitorSource.

Definition at line 312 of file qgeoareamonitor_polling.cpp.

◆ isValid()

bool QGeoAreaMonitorPolling::isValid ( )

inline

Definition at line 41 of file qgeoareamonitor_polling.h.

Referenced by QGeoPositionInfoSourceFactoryPoll::areaMonitor().

Here is the caller graph for this function:

◆ positionInfoSource()

QGeoPositionInfoSource * QGeoAreaMonitorPolling::positionInfoSource ( ) const

overridevirtual

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 nullptr 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.

See also: QGeoPositionInfoSource, setPositionInfoSource()

Reimplemented from QGeoAreaMonitorSource.

Definition at line 302 of file qgeoareamonitor_polling.cpp.

◆ requestUpdate()

bool QGeoAreaMonitorPolling::requestUpdate	(	const QGeoAreaMonitorInfo &	monitor,
		const char *	signal )

overridevirtual

Enables single shot area monitoring.

Area monitoring for monitor will be performed until this QGeoAreaMonitorSource instance emits signal for the first time. Once the signal was emitted, monitor is automatically removed from the list of \l activeMonitors(). If monitor is invalid or has an expiry date that has been passed, this function returns false.

QGeoAreaMonitor singleShotMonitor;
QGeoAreaMonitorSource * source = QGeoAreaMonitorSource::createDefaultSource(this);
//...
bool ret = source->requestUpdate(singleShotMonitor,
                      SIGNAL(areaExited(QGeoAreaMonitor,QGeoPositionInfo)));

The above 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 monitor was already registered via \l startMonitoring() it is converted to a single shot behavior.

Note: Since Qt6 this method always resets the last error to \l {QGeoAreaMonitorSource::}{NoError} before starting monitoring.

See also: startMonitoring(), stopMonitoring()

Implements QGeoAreaMonitorSource.

Definition at line 356 of file qgeoareamonitor_polling.cpp.

◆ setPositionInfoSource()

void QGeoAreaMonitorPolling::setPositionInfoSource ( QGeoPositionInfoSource * newSource )

overridevirtual

Sets the new \l QGeoPositionInfoSource to be used by this QGeoAreaMonitorSource object.

The area monitoring backend becomes the new QObject parent for 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 newSource may be moved to a new thread.

See also: positionInfoSource()

Reimplemented from QGeoAreaMonitorSource.

Definition at line 307 of file qgeoareamonitor_polling.cpp.

◆ startMonitoring()

bool QGeoAreaMonitorPolling::startMonitoring ( const QGeoAreaMonitorInfo & monitor )

overridevirtual

Returns true if the monitoring of 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 monitor is already active, the existing monitor object will be replaced by the new monitor reference. The identification of QGeoAreaMonitorInfo instances happens via \l QGeoAreaMonitorInfo::identifier(). Therefore this function can also be used to update active monitors.

If 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.