The QInputDevice class describes a device from which a QInputEvent originates. More...

#include <qinputdevice.h>

Inheritance diagram for QInputDevice:

Collaboration diagram for QInputDevice:

Public Types
enum class	DeviceType { Unknown = 0x0000 , Mouse = 0x0001 , TouchScreen = 0x0002 , TouchPad = 0x0004 , Puck = 0x0008 , Stylus = 0x0010 , Airbrush = 0x0020 , Keyboard = 0x1000 , AllDevices = 0x7FFFFFFF }
	This enum represents the type of device that generated a QPointerEvent. More...

enum class	Capability { None = 0 , Position = 0x0001 , Area = 0x0002 , Pressure = 0x0004 , Velocity = 0x0008 , NormalizedPosition = 0x0020 , MouseEmulation = 0x0040 , PixelScroll = 0x0080 , Scroll = 0x0100 , Hover = 0x0200 , Rotation = 0x0400 , XTilt = 0x0800 , YTilt = 0x1000 , TangentialPressure = 0x2000 , ZPosition = 0x4000 , All = 0x7FFFFFFF }
	Indicates what kind of information the input device or its driver can provide. More...

Signals
void	availableVirtualGeometryChanged (QRect area)

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
	QInputDevice (QObject *parent=nullptr)
	Creates a new invalid input device instance as a child of parent.

	~QInputDevice ()

	QInputDevice (const QString &name, qint64 systemId, DeviceType type, const QString &seatName=QString(), QObject *parent=nullptr)
	Creates a new input device instance.

QString	name () const
	Returns the device name.

DeviceType	type () const
	Returns the device type.

Capabilities	capabilities () const
	Returns the device capabilities.

bool	hasCapability (Capability cap) const
	Returns whether the device capabilities include the given capability.

qint64	systemId () const
	Returns the platform specific system ID (for example xinput ID on the X11 platform).

QString	seatName () const
	Returns the seat with which the device is associated, if known; otherwise empty.

QRect	availableVirtualGeometry () const
	Returns the region within the \l{QScreen::availableVirtualGeometry}{virtual desktop} that this device can access.

bool	operator== (const QInputDevice &other) 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	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`.

Static Public Member Functions
static QStringList	seatNames ()

static QList< const QInputDevice * >	devices ()
	Returns a list of all registered input devices (keyboards and pointing devices).

static const QInputDevice *	primaryKeyboard (const QString &seatName=QString())
	Returns the core or master keyboard on the given seat seatName.

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
	QInputDevice (QInputDevicePrivate &d, QObject *parent)

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
QString	name

DeviceType	type

Capabilities	capabilities

qint64	systemId

QString	seatName

QRect	availableVirtualGeometry

Properties inherited from QObject
QString	objectName
	the name of this object

Additional Inherited Members
Public Slots inherited from QObject
void	deleteLater ()
	\threadsafe

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

The QInputDevice class describes a device from which a QInputEvent originates.

Since: 6.0 \inmodule QtGui

Each QInputEvent contains a QInputDevice pointer to allow accessing device-specific properties like type, capabilities and seat. It is the responsibility of the platform or generic plug-ins to discover, create and register an instance of this class corresponding to each available input device, via QWindowSystemInterface::registerInputDevice(), before generating any input event referring to that device.

Applications do not need to instantiate this class, but can read the instances pointed to by QInputEvent::device() and QInputDevice::devices().

Definition at line 16 of file qinputdevice.h.

Member Enumeration Documentation

◆ Capability

enum class QInputDevice::Capability

strong

Indicates what kind of information the input device or its driver can provide.

\value None No information about input device capabilities available.

\value Position Indicates that position information is available, meaning that the position() family of functions in the touch points return valid points.

\value Area Indicates that touch area information is available, meaning that QEventPoint::ellipseDiameters() in the touch points return valid values.

\value Pressure Indicates that pressure information is available, meaning that QEventPoint::pressure() returns a valid value.

\value Velocity Indicates that velocity information is available, meaning that QEventPoint::velocity() returns a valid vector.

\value NormalizedPosition Indicates that the normalized position is available, meaning that QEventPoint::globalPosition() returns a valid value.

\value MouseEmulation Indicates that the device synthesizes mouse events.

\value Scroll Indicates that the device has a scroll capability.

\value [since 6.2] PixelScroll Indicates that the device (usually a \l {QInputDevice::DeviceType::TouchPad}{touchpad}) scrolls with \l {QWheelEvent::pixelDelta()}{pixel precision}.

\value Hover Indicates that the device has a hover capability.

\value Rotation Indicates that \l {QEventPoint::}{rotation} information is available.

\value XTilt Indicates that \l {QTabletEvent::xTilt()}{tilt} information is available for the X-axis.

\value YTilt Indicates that \l {QTabletEvent::yTilt()}{tilt} information is available for the Y-axis.

\value TangentialPressure Indicates that \l {QTabletEvent::tangentialPressure()} {tangential pressure} information is available.

\value ZPosition Indicates that position information for the \l {QTabletEvent::z()} {Z-axis} is available.

\value All

Enumerator
None
Position
Area
Pressure
Velocity
NormalizedPosition
MouseEmulation
PixelScroll
Scroll
Hover
Rotation
XTilt
YTilt
TangentialPressure
ZPosition
All

Definition at line 43 of file qinputdevice.h.

◆ DeviceType

enum class QInputDevice::DeviceType

strong

This enum represents the type of device that generated a QPointerEvent.

\value Unknown The device cannot be identified.

\value Mouse A mouse.

\value TouchScreen In this type of device, the touch surface and display are integrated. This means the surface and display typically have the same size, such that there is a direct relationship between the touch points' physical positions and the coordinate reported by QEventPoint. As a result, Qt allows the user to interact directly with multiple QWidgets, QGraphicsItems, or Qt Quick Items at the same time.

\value TouchPad In this type of device, the touch surface is separate from the display. There is not a direct relationship between the physical touch location and the on-screen coordinates. Instead, they are calculated relative to the current mouse position, and the user must use the touch-pad to move this reference point. Unlike touch-screens, Qt allows users to only interact with a single QWidget or QGraphicsItem at a time.

\value Stylus A pen-like device used on a graphics tablet such as a Wacom tablet, or on a touchscreen that provides a separate stylus sensing capability.

\value Airbrush A stylus with a thumbwheel to adjust \l {QTabletEvent::tangentialPressure}{tangentialPressure}.

\value Puck A device that is similar to a flat mouse with a transparent circle with cross-hairs.

\value Keyboard A keyboard.

\value AllDevices Any of the above (used as a default filter value).

Enumerator
Unknown
Mouse
TouchScreen
TouchPad
Puck
Stylus
Airbrush
Keyboard
AllDevices

Definition at line 29 of file qinputdevice.h.

Constructor & Destructor Documentation

◆ QInputDevice() [1/3]

QInputDevice::QInputDevice ( QObject * parent = nullptr )

Creates a new invalid input device instance as a child of parent.

Definition at line 103 of file qinputdevice.cpp.

Referenced by primaryKeyboard().

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◆ ~QInputDevice()

QInputDevice::~QInputDevice ( )

Definition at line 108 of file qinputdevice.cpp.

References QInputDevicePrivate::unregisterDevice().

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◆ QInputDevice() [2/3]

QInputDevice::QInputDevice	(	const QString &	name,
		qint64	id,
		QInputDevice::DeviceType	type,
		const QString &	seatName = QString(),
		QObject *	parent = nullptr )

Creates a new input device instance.

The given name is normally a manufacturer-assigned model name if available, or something else identifiable; id is a platform-specific number that will be unique per device (for example the xinput ID on X11); type identifies what kind of device. On window systems that are capable of handling input from multiple users or sets of input devices at the same time (such as Wayland or X11), seatName identifies the name of the set of devices that will be used together. If the device is a child or slave device (for example one of several mice that can take turns moving the "core pointer"), the master device should be given as the parent.

The platform plugin creates, registers and continues to own each device instance; usually parent should be given for memory management purposes even if there is no master for a particular device.

By default, capabilities() are None.

Definition at line 131 of file qinputdevice.cpp.

◆ QInputDevice() [3/3]

QInputDevice::QInputDevice	(	QInputDevicePrivate &	d,
		QObject *	parent )

protected

Definition at line 140 of file qinputdevice.cpp.

Member Function Documentation

◆ availableVirtualGeometry()

QRect QInputDevice::availableVirtualGeometry ( ) const

Returns the region within the \l{QScreen::availableVirtualGeometry}{virtual desktop} that this device can access.

For example a \l {QInputDevice::DeviceType}{TouchScreen} input device is fixed in place upon a single physical screen, and usually calibrated so that this area is the same as QScreen::geometry(); whereas a \l {QInputDevice::DeviceType}{Mouse} can probably access all screens on the virtual desktop. A Wacom graphics tablet may be configured in a way that it's mapped to all screens, or only to the screen where the user prefers to create drawings, or to the window in which drawing occurs. A \l {QInputDevice::DeviceType}{Stylus} device that is integrated with a touchscreen may be physically limited to that screen.

If the returned rectangle is \l {QRect::isNull()}{null}, it means this device can access the entire virtual desktop.

Definition at line 162 of file qinputdevice.cpp.

References d.

◆ availableVirtualGeometryChanged

void QInputDevice::availableVirtualGeometryChanged ( QRect area )

signal

◆ capabilities()

QInputDevice::Capabilities QInputDevice::capabilities ( ) const

Returns the device capabilities.

Definition at line 193 of file qinputdevice.cpp.

References d.

◆ devices()

QList< const QInputDevice * > QInputDevice::devices ( )

static

Returns a list of all registered input devices (keyboards and pointing devices).

Note: The list of devices is not always complete on all platforms. So far, the most-complete information is available on the \l {Qt for Linux/X11}{X11} platform, at startup and in response to hot-plugging. Most other platforms are only able to provide generic devices of various types, only after receiving events from them; and most platforms do not tell Qt when a device is plugged in, or when it is unplugged at runtime.; The returned list cannot be used to add new devices. To add a simulated touch screen for an autotest, QTest::createTouchDevice() can be used. Platform plugins should call QWindowSystemInterface::registerInputDevice() to add devices as they are discovered.

Definition at line 250 of file qinputdevice.cpp.

References devicesMutex, and lock.

Referenced by QQuickDeliveryAgentPrivate::handleWindowDeactivate(), QPointingDevicePrivate::pointingDeviceById(), primaryKeyboard(), QPointingDevice::primaryPointingDevice(), QPointingDevicePrivate::queryTabletDevice(), QQuickDeliveryAgentPrivate::removeGrabber(), seatNames(), and QXcbConnection::xi2UpdateScrollingDevices().

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◆ hasCapability()

bool QInputDevice::hasCapability ( QInputDevice::Capability capability ) const

Returns whether the device capabilities include the given capability.

Definition at line 202 of file qinputdevice.cpp.

References capabilities.

◆ name()

QString QInputDevice::name ( ) const

Returns the device name.

This string may be empty. It is however useful on systems that have multiple input devices: it can be used to differentiate from which device a QPointerEvent originates.

Definition at line 175 of file qinputdevice.cpp.

References d.

◆ operator==()

bool QInputDevice::operator== ( const QInputDevice & other ) const

Definition at line 362 of file qinputdevice.cpp.

References other(), and systemId.

Referenced by QPointingDevice::operator==().

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◆ primaryKeyboard()

const QInputDevice * QInputDevice::primaryKeyboard ( const QString & seatName = QString() )

static

Returns the core or master keyboard on the given seat seatName.

Definition at line 278 of file qinputdevice.cpp.

References QInputDevice(), d, devices(), devicesMutex, QCoreApplication::instance(), QString::isNull(), Keyboard, qCDebug, qWarning, QInputDevicePrivate::registerDevice(), ret, seatName, and QMutexLocker< Mutex >::unlock().

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◆ seatName()

QString QInputDevice::seatName ( ) const

Returns the seat with which the device is associated, if known; otherwise empty.

Devices that are intended to be used together by one user may be configured to have the same seat name. That is only possible on Wayland and X11 platforms so far.

Definition at line 225 of file qinputdevice.cpp.

References d.

◆ seatNames()

QStringList QInputDevice::seatNames ( )

static

Since: 6.3

Returns a list of seat names for all registered input devices (keyboards and pointing devices).

Definition at line 261 of file qinputdevice.cpp.

References d, devices(), devicesMutex, and QMutexLocker< Mutex >::unlock().

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◆ systemId()

qint64 QInputDevice::systemId ( ) const

Returns the platform specific system ID (for example xinput ID on the X11 platform).

All platforms are expected to provide a unique system ID for each device.

Definition at line 212 of file qinputdevice.cpp.

References d.

◆ type()

QInputDevice::DeviceType QInputDevice::type ( ) const

Returns the device type.

Definition at line 184 of file qinputdevice.cpp.

References d.

Property Documentation

◆ availableVirtualGeometry

QRect QInputDevice::availableVirtualGeometry

read

Definition at line 25 of file qinputdevice.h.

Referenced by QEventPoint::normalizedPosition().

◆ capabilities

Capabilities QInputDevice::capabilities

read

Definition at line 22 of file qinputdevice.h.

Referenced by hasCapability(), QGuiApplicationPrivate::processTouchEvent(), and QXcbConnection::xi2UpdateScrollingDevices().

◆ name

QString QInputDevice::name

read

Definition at line 20 of file qinputdevice.h.

◆ seatName

QString QInputDevice::seatName

read

Definition at line 24 of file qinputdevice.h.

Referenced by primaryKeyboard(), and QPointingDevice::primaryPointingDevice().

◆ systemId

qint64 QInputDevice::systemId

read

Definition at line 23 of file qinputdevice.h.

Referenced by createInputDevice(), operator==(), and QWindowsTabletSupport::translateTabletPacketEvent().

◆ type

DeviceType QInputDevice::type

read

Definition at line 21 of file qinputdevice.h.

Referenced by QInputEvent::deviceType(), QApplication::notify(), QQuickDeliveryAgentPrivate::onGrabChanged(), QQuickTest::pointerMove(), QQuickTest::pointerPress(), QQuickTest::pointerRelease(), QGuiApplicationPrivate::processMouseEvent(), QGuiApplicationPrivate::processTouchEvent(), QXcbConnection::startSystemMoveResizeForTouch(), QQuickDeliveryAgentPrivate::touchToMouseEvent(), and QWindowsTabletSupport::translateTabletPacketEvent().

The documentation for this class was generated from the following files:

qtbase/src/gui/kernel/qinputdevice.h (05fc3aef53348fb58be6308076e000825b704e58)
qtbase/src/gui/kernel/qinputdevice.cpp (a6059cebe85c4ba8dd43df8aae146799c8bb6cb0)

Public Types

Signals

Public Member Functions

Static Public Member Functions

Protected Member Functions

Properties

Additional Inherited Members

Detailed Description

Member Enumeration Documentation

◆ Capability

◆ DeviceType

Constructor & Destructor Documentation

◆ QInputDevice() [1/3]

◆ ~QInputDevice()

◆ QInputDevice() [2/3]

◆ QInputDevice() [3/3]

Member Function Documentation

◆ availableVirtualGeometry()

◆ availableVirtualGeometryChanged

◆ capabilities()

◆ devices()

◆ hasCapability()

◆ name()

◆ operator==()

◆ primaryKeyboard()

◆ seatName()

◆ seatNames()

◆ systemId()

◆ type()

Property Documentation

◆ availableVirtualGeometry

◆ capabilities

◆ name

◆ seatName

◆ systemId

◆ type