#include <qquicksinglepointhandler_p.h>

Inheritance diagram for QQuickSinglePointHandler:

Collaboration diagram for QQuickSinglePointHandler:

Signals
void	pointChanged ()

Signals inherited from QQuickPointerDeviceHandler
void	acceptedDevicesChanged ()

void	acceptedPointerTypesChanged ()

void	acceptedButtonsChanged ()

void	acceptedModifiersChanged ()

Signals inherited from QQuickPointerHandler
void	enabledChanged ()

void	activeChanged ()

void	targetChanged ()

void	marginChanged ()

	Q_REVISION (2, 15) void dragThresholdChanged()

void	grabChanged (QPointingDevice::GrabTransition transition, QEventPoint point)

void	grabPermissionChanged ()

void	canceled (QEventPoint point)

	Q_REVISION (6, 3) void parentChanged()

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.

Public Member Functions
	QQuickSinglePointHandler (QQuickItem *parent=nullptr)
	\qmltype SinglePointHandler \qmlabstract \preliminary \instantiates QQuickSinglePointHandler \inherits PointerDeviceHandler \inqmlmodule QtQuick

QQuickHandlerPoint	point () const

Public Member Functions inherited from QQuickPointerDeviceHandler
	QQuickPointerDeviceHandler (QQuickItem *parent=nullptr)
	\qmltype PointerDeviceHandler \qmlabstract

QInputDevice::DeviceTypes	acceptedDevices () const

QPointingDevice::PointerTypes	acceptedPointerTypes () const

Qt::MouseButtons	acceptedButtons () const
	\qmlproperty flags QtQuick::PointerDeviceHandler::acceptedButtons

Qt::KeyboardModifiers	acceptedModifiers () const

Public Member Functions inherited from QQuickPointerHandler
	QQuickPointerHandler (QQuickItem *parent=nullptr)
	\qmltype PointerHandler \qmlabstract

	~QQuickPointerHandler ()

bool	enabled () const
	\qmlproperty bool QtQuick::PointerHandler::enabled

void	setEnabled (bool enabled)

bool	active () const
	\readonly \qmlproperty bool QtQuick::PointerHandler::active

QQuickItem *	target () const
	\qmlproperty Item QtQuick::PointerHandler::target

void	setTarget (QQuickItem *target)

QQuickItem *	parentItem () const
	\qmlproperty Item QtQuick::PointerHandler::parent

void	setParentItem (QQuickItem *p)

void	handlePointerEvent (QPointerEvent *event)

GrabPermissions	grabPermissions () const
	\qmlproperty flags QtQuick::PointerHandler::grabPermissions

void	setGrabPermissions (GrabPermissions grabPermissions)

qreal	margin () const
	\qmlproperty real PointerHandler::margin

void	setMargin (qreal pointDistanceThreshold)

int	dragThreshold () const
	\qmlproperty int PointerHandler::dragThreshold

void	setDragThreshold (int t)

void	resetDragThreshold ()

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	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.

void	moveToThread (QThread *thread)
	Changes the thread affinity for this object and its children.

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::milliseconds time, Qt::TimerType timerType=Qt::CoarseTimer)

void	killTimer (int id)
	Kills the timer with timer identifier, id.

template<typename T >
T	findChild (const QString &aName=QString(), 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 (const QString &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 >
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`.

Public Member Functions inherited from QQmlParserStatus
	QQmlParserStatus ()

virtual	~QQmlParserStatus ()

virtual void	classBegin ()=0
	Invoked after class creation, but before any properties have been set.

virtual void	componentComplete ()=0
	Invoked after the root component that caused this instantiation has completed construction.

Protected Member Functions
	QQuickSinglePointHandler (QQuickSinglePointHandlerPrivate &dd, QQuickItem *parent)

bool	wantsPointerEvent (QPointerEvent *event) override
	It is the responsibility of this function to decide whether the event could be relevant at all to this handler, as a preliminary check.

void	handlePointerEventImpl (QPointerEvent *event) override
	This function can be overridden to implement whatever behavior a specific subclass is intended to have:

virtual void	handleEventPoint (QPointerEvent *event, QEventPoint &point)

QEventPoint &	currentPoint (QPointerEvent *ev)

void	onGrabChanged (QQuickPointerHandler grabber, QPointingDevice::GrabTransition transition, QPointerEvent event, QEventPoint &point) override
	Notification that the grab has changed in some way which is relevant to this handler.

void	setIgnoreAdditionalPoints (bool v=true)

void	moveTarget (QPointF pos, QEventPoint &point)

void	setPointId (int id)

Protected Member Functions inherited from QQuickPointerDeviceHandler
	QQuickPointerDeviceHandler (QQuickPointerDeviceHandlerPrivate &dd, QQuickItem *parent=nullptr)

bool	wantsPointerEvent (QPointerEvent *event) override
	It is the responsibility of this function to decide whether the event could be relevant at all to this handler, as a preliminary check.

Protected Member Functions inherited from QQuickPointerHandler
	QQuickPointerHandler (QQuickPointerHandlerPrivate &dd, QQuickItem *parent)

void	classBegin () override
	Overridden only because QQmlParserStatus requires it.

void	componentComplete () override
	Overridden from QQmlParserStatus to ensure that parentItem() sets its cursor if this handler's \l cursorShape property has been set.

bool	event (QEvent *) override

QPointerEvent *	currentEvent ()

virtual bool	wantsPointerEvent (QPointerEvent *event)
	It is the responsibility of this function to decide whether the event could be relevant at all to this handler, as a preliminary check.

virtual bool	wantsEventPoint (const QPointerEvent *event, const QEventPoint &point)
	Returns `true` if the given point (as part of event) could be relevant at all to this handler, as a preliminary check.

virtual void	handlePointerEventImpl (QPointerEvent *event)
	This function can be overridden to implement whatever behavior a specific subclass is intended to have:

void	setActive (bool active)

virtual void	onTargetChanged (QQuickItem *oldTarget)

virtual void	onActiveChanged ()

virtual void	onGrabChanged (QQuickPointerHandler grabber, QPointingDevice::GrabTransition transition, QPointerEvent event, QEventPoint &point)
	Notification that the grab has changed in some way which is relevant to this handler.

virtual bool	canGrab (QPointerEvent *event, const QEventPoint &point)
	Check whether it's OK to take an exclusive grab of the point.

virtual bool	approveGrabTransition (QPointerEvent event, const QEventPoint &point, QObject proposedGrabber)
	Check this handler's rules to see if \l proposedGrabber will be allowed to take the exclusive grab.

void	setPassiveGrab (QPointerEvent *event, const QEventPoint &point, bool grab=true)
	Acquire or give up a passive grab of the given point, according to the grab state.

bool	setExclusiveGrab (QPointerEvent *ev, const QEventPoint &point, bool grab=true)
	Acquire or give up the exclusive grab of the given point, according to the grab state, and subject to the rules: canGrab(), and the rule not to relinquish another handler's grab.

void	cancelAllGrabs (QPointerEvent *event, QEventPoint &point)
	Cancel any existing grab of the given point.

QPointF	eventPos (const QEventPoint &point) const

bool	parentContains (const QEventPoint &point) const
	Returns `true` if margin() > 0 and point is within the margin beyond QQuickItem::boundingRect(), or else returns QQuickItem::contains() QEventPoint::position() effectively (because parentContains(scenePosition) calls QQuickItem::mapFromScene()).

bool	parentContains (const QPointF &scenePosition) const
	Returns `true` if scenePosition is within the margin() beyond QQuickItem::boundingRect() (if margin > 0), or parentItem() contains scenePosition according to QQuickItem::contains().

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.

virtual void	connectNotify (const QMetaMethod &signal)

virtual void	disconnectNotify (const QMetaMethod &signal)

	QObject (QObjectPrivate &dd, QObject *parent=nullptr)

Properties
QQuickHandlerPoint	point

Properties inherited from QQuickPointerDeviceHandler
QInputDevice::DeviceTypes	acceptedDevices

QPointingDevice::PointerTypes	acceptedPointerTypes

Qt::MouseButtons	acceptedButtons

Qt::KeyboardModifiers	acceptedModifiers

Properties inherited from QQuickPointerHandler
bool	enabled

bool	active

QQuickItem *	target

QQuickItem *	parent

GrabPermissions	grabPermissions

qreal	margin

int	dragThreshold

Properties inherited from QObject
QString	objectName
	the name of this object

Additional Inherited Members
Public Types inherited from QQuickPointerHandler
enum	GrabPermission { TakeOverForbidden = 0x0 , CanTakeOverFromHandlersOfSameType = 0x01 , CanTakeOverFromHandlersOfDifferentType = 0x02 , CanTakeOverFromItems = 0x04 , CanTakeOverFromAnything = 0x0F , ApprovesTakeOverByHandlersOfSameType = 0x10 , ApprovesTakeOverByHandlersOfDifferentType = 0x20 , ApprovesTakeOverByItems = 0x40 , ApprovesCancellation = 0x80 , ApprovesTakeOverByAnything = 0xF0 }

Public Slots inherited from QQuickPointerDeviceHandler
void	setAcceptedDevices (QInputDevice::DeviceTypes acceptedDevices)
	\qmlproperty flags PointerDeviceHandler::acceptedDevices

void	setAcceptedPointerTypes (QPointingDevice::PointerTypes acceptedPointerTypes)
	\qmlproperty flags PointerDeviceHandler::acceptedPointerTypes

void	setAcceptedButtons (Qt::MouseButtons buttons)

void	setAcceptedModifiers (Qt::KeyboardModifiers acceptedModifiers)
	\qmlproperty flags PointerDeviceHandler::acceptedModifiers

Public Slots inherited from QObject
void	deleteLater ()
	\threadsafe

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 Attributes inherited from QObject
QScopedPointer< QObjectData >	d_ptr

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 25 of file qquicksinglepointhandler_p.h.

Constructor & Destructor Documentation

◆ QQuickSinglePointHandler() [1/2]

QT_BEGIN_NAMESPACE QQuickSinglePointHandler::QQuickSinglePointHandler ( QQuickItem * parent = nullptr )

explicit

\qmltype SinglePointHandler \qmlabstract \preliminary \instantiates QQuickSinglePointHandler \inherits PointerDeviceHandler \inqmlmodule QtQuick

Abstract handler for single-point Pointer Events.

An intermediate class (not registered as a QML type) for the most common handlers: those which expect only a single point. wantsPointerEvent() will choose the first point which is inside the \l target item, and return true as long as the event contains that point. Override handleEventPoint() to implement a single-point handler.

Definition at line 26 of file qquicksinglepointhandler.cpp.

◆ QQuickSinglePointHandler() [2/2]

QQuickSinglePointHandler::QQuickSinglePointHandler	(	QQuickSinglePointHandlerPrivate &	dd,
		QQuickItem *	parent
	)

protected

Definition at line 31 of file qquicksinglepointhandler.cpp.

Member Function Documentation

◆ currentPoint()

QEventPoint & QQuickSinglePointHandler::currentPoint ( QPointerEvent * ev )

protected

Referenced by handlePointerEventImpl().

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◆ handleEventPoint()

void QQuickSinglePointHandler::handleEventPoint	(	QPointerEvent *	event,
		QEventPoint &	point
	)

protectedvirtual

Reimplemented in QQuickHoverHandler, QQuickPointHandler, QQuickTapHandler, QQuickWheelHandler, QQuickTableViewHoverHandler, and QQuickTableViewResizeHandler.

Definition at line 118 of file qquicksinglepointhandler.cpp.

References QQuickPointerDeviceHandler::acceptedButtons, Qt::NoButton, point, QEventPoint::Released, and QQuickPointerHandler::setExclusiveGrab().

Referenced by QQuickPointHandler::handleEventPoint(), QQuickTapHandler::handleEventPoint(), QQuickWheelHandler::handleEventPoint(), and handlePointerEventImpl().

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◆ handlePointerEventImpl()

void QQuickSinglePointHandler::handlePointerEventImpl ( QPointerEvent * event )

overrideprotectedvirtual

This function can be overridden to implement whatever behavior a specific subclass is intended to have:

handle all the event's QPointerEvent::points() for which wantsEventPoint() already returned true
call setPassiveGrab() setExclusiveGrab() or cancelAllGrabs() as necessary
call QEvent::accept() to stop propagation, or ignore() to allow it to keep going

Reimplemented from QQuickPointerHandler.

Definition at line 107 of file qquicksinglepointhandler.cpp.

References currentPoint(), d, emit, handleEventPoint(), QQuickPointerHandler::handlePointerEventImpl(), pointChanged(), and Q_ASSERT.

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◆ moveTarget()

void QQuickSinglePointHandler::moveTarget	(	QPointF	pos,
		QEventPoint &	point
	)

protected

Definition at line 164 of file qquicksinglepointhandler.cpp.

References d, QQuickItem::mapFromScene(), point, pos, QQuickHandlerPoint::scenePosition, QQuickItem::setPosition(), and QQuickPointerHandler::target.

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◆ onGrabChanged()

void QQuickSinglePointHandler::onGrabChanged	(	QQuickPointerHandler *	grabber,
		QPointingDevice::GrabTransition	transition,
		QPointerEvent *	event,
		QEventPoint &	point
	)

overrideprotectedvirtual

Notification that the grab has changed in some way which is relevant to this handler.

Since: 5.15 \qmlproperty Qt::CursorShape PointerHandler::cursorShape This property holds the cursor shape that will appear whenever the mouse is hovering over the \l parent item while \l active is true.

The available cursor shapes are: \list

The default value is not set, which allows the \l {QQuickItem::cursor()}{cursor} of \l parent item to appear. This property can be reset to the same initial condition by setting it to undefined.

Note: When this property has not been set, or has been set to undefined, if you read the value it will return Qt.ArrowCursor.

See also: Qt::CursorShape, QQuickItem::cursor(), HoverHandler::cursorShape

The grabber (subject) will be the Input Handler whose state is changing, or null if the state change regards an Item. The transition (verb) tells what happened. The point (object) is the \l eventPoint that was grabbed or ungrabbed. QQuickDeliveryAgent calls this function. The Input Handler must react in whatever way is appropriate, and must emit the relevant signals (for the benefit of QML code). A subclass is allowed to override this virtual function, but must always call its parent class's implementation in addition to (usually after) whatever custom behavior it implements.

Reimplemented from QQuickPointerHandler.

Reimplemented in QQuickTapHandler, and QQuickTableViewResizeHandler.

Definition at line 130 of file qquicksinglepointhandler.cpp.

References QPointingDevice::CancelGrabExclusive, QPointingDevice::CancelGrabPassive, d, QPointingDevice::GrabExclusive, QPointingDevice::GrabPassive, QQuickPointerHandler::onGrabChanged(), QPointingDevice::OverrideGrabPassive, point, QQuickHandlerPoint::sceneGrabPosition, QQuickPointerHandler::setActive(), QPointingDevice::UngrabExclusive, and QPointingDevice::UngrabPassive.

Referenced by QQuickTapHandler::onGrabChanged(), and QQuickTableViewResizeHandler::onGrabChanged().

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◆ point()

QQuickHandlerPoint QQuickSinglePointHandler::point ( ) const

Definition at line 178 of file qquicksinglepointhandler.cpp.

References d.

◆ pointChanged

void QQuickSinglePointHandler::pointChanged ( )

signal

Referenced by handlePointerEventImpl().

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◆ setIgnoreAdditionalPoints()

void QQuickSinglePointHandler::setIgnoreAdditionalPoints ( bool v = true )

protected

Definition at line 158 of file qquicksinglepointhandler.cpp.

References d.

Referenced by QQuickPointHandler::QQuickPointHandler().

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◆ setPointId()

void QQuickSinglePointHandler::setPointId ( int id )

protected

Definition at line 172 of file qquicksinglepointhandler.cpp.

References d.

Referenced by QQuickHoverHandler::wantsPointerEvent(), wantsPointerEvent(), and QQuickWheelHandler::wantsPointerEvent().

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◆ wantsPointerEvent()

bool QQuickSinglePointHandler::wantsPointerEvent ( QPointerEvent * event )

overrideprotectedvirtual

It is the responsibility of this function to decide whether the event could be relevant at all to this handler, as a preliminary check.

Returns true if this handler would like handlePointerEventImpl() to be called. If it returns false, the handler will be deactivated: setActive(false) will be called, and any remaining exclusive grab will be relinquished, as a fail-safe.

If you override this function, you should call the immediate parent class implementation (and return false if it returns false); that in turn calls its parent class implementation, and so on. QQuickSinglePointHandler::wantsPointerEvent() and QQuickMultiPointHandler::wantsPointerEvent() call wantsEventPoint(), which is also virtual. You usually can get the behavior you want by subclassing the appropriate handler type, overriding QQuickSinglePointHandler::handleEventPoint() or handlePointerEventImpl(), and perhaps overriding wantsEventPoint() if needed.