#include <qquickmultipointtoucharea_p.h>

Inheritance diagram for QQuickMultiPointTouchArea:

Collaboration diagram for QQuickMultiPointTouchArea:

Signals
void	pressed (const QList< QObject * > &points)

void	updated (const QList< QObject * > &points)

void	released (const QList< QObject * > &points)

void	canceled (const QList< QObject * > &points)

void	gestureStarted (QQuickGrabGestureEvent *gesture)

void	touchUpdated (const QList< QObject * > &points)

void	minimumTouchPointsChanged ()

void	maximumTouchPointsChanged ()

void	mouseEnabledChanged ()

Signals inherited from QQuickItem
void	childrenRectChanged (const QRectF &)

void	baselineOffsetChanged (qreal)

void	stateChanged (const QString &)

void	focusChanged (bool)

void	activeFocusChanged (bool)

Q_REVISION(6, 7) void focusPolicyChanged(Qt	Q_REVISION (2, 1) void activeFocusOnTabChanged(bool)

void	parentChanged (QQuickItem *)

void	transformOriginChanged (TransformOrigin)

void	smoothChanged (bool)

void	antialiasingChanged (bool)

void	clipChanged (bool)

	Q_REVISION (2, 1) void windowChanged(QQuickWindow *window)

void	childrenChanged ()

void	opacityChanged ()

void	enabledChanged ()

void	visibleChanged ()

void	visibleChildrenChanged ()

void	rotationChanged ()

void	scaleChanged ()

void	xChanged ()

void	yChanged ()

void	widthChanged ()

void	heightChanged ()

void	zChanged ()

void	implicitWidthChanged ()

void	implicitHeightChanged ()

	Q_REVISION (2, 11) void containmentMaskChanged()

	Q_REVISION (6, 0) void paletteChanged()

	Q_REVISION (6, 0) void paletteCreated()

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
	QQuickMultiPointTouchArea (QQuickItem *parent=nullptr)
	\qmltype GestureEvent \instantiates QQuickGrabGestureEvent \inqmlmodule QtQuick

	~QQuickMultiPointTouchArea ()

int	minimumTouchPoints () const
	\qmlproperty int QtQuick::MultiPointTouchArea::minimumTouchPoints \qmlproperty int QtQuick::MultiPointTouchArea::maximumTouchPoints

void	setMinimumTouchPoints (int num)

int	maximumTouchPoints () const

void	setMaximumTouchPoints (int num)

bool	mouseEnabled () const

void	setMouseEnabled (bool arg)
	\qmlproperty bool QtQuick::MultiPointTouchArea::mouseEnabled

QQmlListProperty< QQuickTouchPoint >	touchPoints ()

Public Member Functions inherited from QQuickItem
	QQuickItem (QQuickItem *parent=nullptr)
	Constructs a QQuickItem with the given parent.

	~QQuickItem () override
	Destroys the QQuickItem.

QQuickWindow *	window () const
	Returns the window in which this item is rendered.

QQuickItem *	parentItem () const

void	setParentItem (QQuickItem *parent)

void	stackBefore (const QQuickItem *)
	Moves the specified sibling item to the index before this item within the list of children.

void	stackAfter (const QQuickItem *)
	Moves the specified sibling item to the index after this item within the list of children.

QRectF	childrenRect ()
	\qmlpropertygroup QtQuick::Item::childrenRect \qmlproperty real QtQuick::Item::childrenRect.x \qmlproperty real QtQuick::Item::childrenRect.y \qmlproperty real QtQuick::Item::childrenRect.width \qmlproperty real QtQuick::Item::childrenRect.height \readonly

QList< QQuickItem * >	childItems () const
	Returns the children of this item.

bool	clip () const
	\qmlproperty bool QtQuick::Item::clip This property holds whether clipping is enabled.

void	setClip (bool)

QString	state () const
	\qmlproperty string QtQuick::Item::state

void	setState (const QString &)

qreal	baselineOffset () const
	\qmlproperty int QtQuick::Item::baselineOffset

void	setBaselineOffset (qreal)

QQmlListProperty< QQuickTransform >	transform ()

qreal	x () const

qreal	y () const

QPointF	position () const

void	setX (qreal)

void	setY (qreal)

void	setPosition (const QPointF &)

QBindable< qreal >	bindableX ()

QBindable< qreal >	bindableY ()

qreal	width () const

void	setWidth (qreal)

void	resetWidth ()

void	setImplicitWidth (qreal)

qreal	implicitWidth () const
	Returns the width of the item that is implied by other properties that determine the content.

QBindable< qreal >	bindableWidth ()

qreal	height () const

void	setHeight (qreal)

void	resetHeight ()

void	setImplicitHeight (qreal)

qreal	implicitHeight () const

QBindable< qreal >	bindableHeight ()

QSizeF	size () const

void	setSize (const QSizeF &size)

TransformOrigin	transformOrigin () const

void	setTransformOrigin (TransformOrigin)

QPointF	transformOriginPoint () const

void	setTransformOriginPoint (const QPointF &)

qreal	z () const

void	setZ (qreal)

qreal	rotation () const

void	setRotation (qreal)

qreal	scale () const

void	setScale (qreal)

qreal	opacity () const

void	setOpacity (qreal)

bool	isVisible () const

void	setVisible (bool)

bool	isEnabled () const

void	setEnabled (bool)

bool	smooth () const

void	setSmooth (bool)

bool	activeFocusOnTab () const
	\qmlproperty bool QtQuick::Item::activeFocusOnTab

void	setActiveFocusOnTab (bool)

bool	antialiasing () const

void	setAntialiasing (bool)

void	resetAntialiasing ()

Flags	flags () const
	Returns the item flags for this item.

void	setFlag (Flag flag, bool enabled=true)
	Enables the specified flag for this item if enabled is true; if enabled is false, the flag is disabled.

void	setFlags (Flags flags)
	Enables the specified flags for this item.

virtual QRectF	boundingRect () const
	Returns the extents of the item in its own coordinate system: a rectangle from {0, 0} to \l width() and \l height().

virtual QRectF	clipRect () const
	Returns the rectangular area within this item that is currently visible in \l viewportItem(), if there is a viewport and the \l ItemObservesViewport flag is set; otherwise, the extents of this item in its own coordinate system: a rectangle from {0, 0} to \l width() and \l height().

QQuickItem *	viewportItem () const
	If the \l ItemObservesViewport flag is set, returns the nearest parent with the \l ItemIsViewport flag.

bool	hasActiveFocus () const

bool	hasFocus () const

void	setFocus (bool)

void	setFocus (bool focus, Qt::FocusReason reason)

bool	isFocusScope () const
	Returns true if this item is a focus scope, and false otherwise.

QQuickItem *	scopedFocusItem () const
	If this item is a focus scope, this returns the item in its focus chain that currently has focus.

Qt::FocusPolicy	focusPolicy () const

void	setFocusPolicy (Qt::FocusPolicy policy)
	Sets the focus policy of this item to policy.

bool	isAncestorOf (const QQuickItem *child) const
	Returns `true` if this item is an ancestor of child (i.e., if this item is child's parent, or one of child's parent's ancestors).

Qt::MouseButtons	acceptedMouseButtons () const
	Returns the mouse buttons accepted by this item.

void	setAcceptedMouseButtons (Qt::MouseButtons buttons)
	Sets the mouse buttons accepted by this item to buttons.

bool	acceptHoverEvents () const
	Returns whether hover events are accepted by this item.

void	setAcceptHoverEvents (bool enabled)
	If enabled is true, this sets the item to accept hover events; otherwise, hover events are not accepted by this item.

bool	acceptTouchEvents () const
	Returns whether touch events are accepted by this item.

void	setAcceptTouchEvents (bool accept)
	If enabled is true, this sets the item to accept touch events; otherwise, touch events are not accepted by this item.

bool	isUnderMouse () const

void	grabMouse ()

void	ungrabMouse ()

bool	keepMouseGrab () const
	Returns whether mouse input should exclusively remain with this item.

void	setKeepMouseGrab (bool)
	Sets whether the mouse input should remain exclusively with this item.

bool	filtersChildMouseEvents () const
	Returns whether pointer events intended for this item's children should be filtered through this item.

void	setFiltersChildMouseEvents (bool filter)
	Sets whether pointer events intended for this item's children should be filtered through this item.

void	grabTouchPoints (const QList< int > &ids)

void	ungrabTouchPoints ()

bool	keepTouchGrab () const
	Returns whether the touch points grabbed by this item should exclusively remain with this item.

void	setKeepTouchGrab (bool)
	Sets whether the touch points grabbed by this item should remain exclusively with this item.

	Q_REVISION (2, 4) Q_INVOKABLE bool grabToImage(const QJSValue &callback

QSharedPointer< QQuickItemGrabResult >	grabToImage (const QSize &targetSize=QSize())
	Grabs the item into an in-memory image.

virtual Q_INVOKABLE bool	contains (const QPointF &point) const
	\qmlmethod bool QtQuick::Item::contains(point point)

QObject *	containmentMask () const

void	setContainmentMask (QObject *mask)

QTransform	itemTransform (QQuickItem , bool ) const
	\qmlmethod point QtQuick::Item::mapFromItem(Item item, real x, real y) \qmlmethod point QtQuick::Item::mapFromItem(Item item, point p) \qmlmethod rect QtQuick::Item::mapFromItem(Item item, real x, real y, real width, real height) \qmlmethod rect QtQuick::Item::mapFromItem(Item item, rect r)

QPointF	mapToScene (const QPointF &point) const
	Maps the given point in this item's coordinate system to the equivalent point within the scene's coordinate system, and returns the mapped coordinate.

QRectF	mapRectToItem (const QQuickItem *item, const QRectF &rect) const
	Maps the given rect in this item's coordinate system to the equivalent rectangular area within item's coordinate system, and returns the mapped rectangle value.

QRectF	mapRectToScene (const QRectF &rect) const
	Maps the given rect in this item's coordinate system to the equivalent rectangular area within the scene's coordinate system, and returns the mapped rectangle value.

QPointF	mapFromScene (const QPointF &point) const
	Maps the given point in the scene's coordinate system to the equivalent point within this item's coordinate system, and returns the mapped coordinate.

QRectF	mapRectFromItem (const QQuickItem *item, const QRectF &rect) const
	Maps the given rect in item's coordinate system to the equivalent rectangular area within this item's coordinate system, and returns the mapped rectangle value.

QRectF	mapRectFromScene (const QRectF &rect) const
	Maps the given rect in the scene's coordinate system to the equivalent rectangular area within this item's coordinate system, and returns the mapped rectangle value.

void	polish ()
	Schedules a polish event for this item.

Q_INVOKABLE QPointF	mapFromItem (const QQuickItem *item, const QPointF &point) const
	Maps the given point in item's coordinate system to the equivalent point within this item's coordinate system, and returns the mapped coordinate.

Q_INVOKABLE QPointF	mapFromItem (const QQuickItem *item, qreal x, qreal y)

Q_INVOKABLE QRectF	mapFromItem (const QQuickItem *item, const QRectF &rect) const

Q_INVOKABLE QRectF	mapFromItem (const QQuickItem *item, qreal x, qreal y, qreal width, qreal height) const

Q_INVOKABLE QPointF	mapToItem (const QQuickItem *item, const QPointF &point) const
	Maps the given point in this item's coordinate system to the equivalent point within item's coordinate system, and returns the mapped coordinate.

Q_INVOKABLE QPointF	mapToItem (const QQuickItem *item, qreal x, qreal y)

Q_INVOKABLE QRectF	mapToItem (const QQuickItem *item, const QRectF &rect) const

Q_INVOKABLE QRectF	mapToItem (const QQuickItem *item, qreal x, qreal y, qreal width, qreal height) const

	Q_REVISION (2, 7) Q_INVOKABLE QPointF mapFromGlobal(qreal x

	Q_REVISION (2, 7) Q_INVOKABLE QPointF mapFromGlobal(const QPointF &point) const

	Q_REVISION (2, 7) Q_INVOKABLE QPointF mapToGlobal(qreal x

	Q_REVISION (2, 7) Q_INVOKABLE QPointF mapToGlobal(const QPointF &point) const

Q_INVOKABLE void	forceActiveFocus ()
	\qmlmethod point QtQuick::Item::mapToItem(Item item, real x, real y) \qmlmethod point QtQuick::Item::mapToItem(Item item, point p) \qmlmethod rect QtQuick::Item::mapToItem(Item item, real x, real y, real width, real height) \qmlmethod rect QtQuick::Item::mapToItem(Item item, rect r)

Q_INVOKABLE void	forceActiveFocus (Qt::FocusReason reason)
	\qmlmethod QtQuick::Item::forceActiveFocus(Qt::FocusReason reason) This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.Forces active focus on the item with the given reason.

	Q_REVISION (2, 1) Q_INVOKABLE QQuickItem *nextItemInFocusChain(bool forward

Q_INVOKABLE QQuickItem *	childAt (qreal x, qreal y) const
	\qmlmethod QtQuick::Item::childAt(real x, real y)

	Q_REVISION (6, 3) Q_INVOKABLE void ensurePolished()

	Q_REVISION (6, 3) Q_INVOKABLE void dumpItemTree() const

virtual bool	isTextureProvider () const
	Returns true if this item is a texture provider.

virtual QSGTextureProvider *	textureProvider () const
	Returns the texture provider for an item.

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	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`.

Public Member Functions inherited from QQmlParserStatus
	QQmlParserStatus ()

virtual	~QQmlParserStatus ()

Static Public Member Functions
static void	touchPoint_append (QQmlListProperty< QQuickTouchPoint > list, QQuickTouchPoint touch)

static qsizetype	touchPoint_count (QQmlListProperty< QQuickTouchPoint > *list)

static QQuickTouchPoint *	touchPoint_at (QQmlListProperty< QQuickTouchPoint > *list, qsizetype index)

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 Types
enum class	RemapEventPoints { No , ToLocal }

Protected Member Functions
void	touchEvent (QTouchEvent *) override
	This event handler can be reimplemented in a subclass to receive touch events for an item.

bool	childMouseEventFilter (QQuickItem receiver, QEvent event) override
	Reimplement this method to filter the pointer events that are received by this item's children.

void	mousePressEvent (QMouseEvent *event) override
	This event handler can be reimplemented in a subclass to receive mouse press events for an item.

void	mouseReleaseEvent (QMouseEvent *event) override
	This event handler can be reimplemented in a subclass to receive mouse release events for an item.

void	mouseMoveEvent (QMouseEvent *event) override
	This event handler can be reimplemented in a subclass to receive mouse move events for an item.

void	mouseUngrabEvent () override
	This event handler can be reimplemented in a subclass to be notified when a mouse ungrab event has occurred on this item.

void	touchUngrabEvent () override
	This event handler can be reimplemented in a subclass to be notified when a touch ungrab event has occurred on this item.

void	addTouchPrototype (QQuickTouchPoint *prototype)

void	addTouchPoint (const QEventPoint *p)

void	addTouchPoint (const QMouseEvent *e)

void	clearTouchLists ()

void	updateTouchPoint (QQuickTouchPoint , const QEventPoint )

void	updateTouchPoint (QQuickTouchPoint dtp, const QMouseEvent e)

void	updateTouchData (QEvent *, RemapEventPoints remap=RemapEventPoints::No)

bool	sendMouseEvent (QMouseEvent *event)

bool	shouldFilter (QEvent *event)

void	grabGesture (QPointingDevice *dev)

QSGNode *	updatePaintNode (QSGNode , UpdatePaintNodeData ) override
	Called on the render thread when it is time to sync the state of the item with the scene graph.

Protected Member Functions inherited from QQuickItem
bool	event (QEvent *) override
	\reimp

bool	isComponentComplete () const
	Returns true if construction of the QML component is complete; otherwise returns false.

virtual void	itemChange (ItemChange, const ItemChangeData &)
	Called when change occurs for this item.

virtual void	geometryChange (const QRectF &newGeometry, const QRectF &oldGeometry)

bool	widthValid () const
	Returns whether the width property has been set explicitly.

bool	heightValid () const
	Returns whether the height property has been set explicitly.

void	setImplicitSize (qreal, qreal)

void	classBegin () override
	\reimp Derived classes should call the base class method before adding their own action to perform at classBegin.

void	componentComplete () override
	\reimp Derived classes should call the base class method before adding their own actions to perform at componentComplete.

virtual void	keyPressEvent (QKeyEvent *event)
	This event handler can be reimplemented in a subclass to receive key press events for an item.

virtual void	keyReleaseEvent (QKeyEvent *event)
	This event handler can be reimplemented in a subclass to receive key release events for an item.

virtual void	focusInEvent (QFocusEvent *)
	This event handler can be reimplemented in a subclass to receive focus-in events for an item.

virtual void	focusOutEvent (QFocusEvent *)
	This event handler can be reimplemented in a subclass to receive focus-out events for an item.

virtual void	mouseDoubleClickEvent (QMouseEvent *event)
	This event handler can be reimplemented in a subclass to receive mouse double-click events for an item.

virtual void	hoverEnterEvent (QHoverEvent *event)
	This event handler can be reimplemented in a subclass to receive hover-enter events for an item.

virtual void	hoverMoveEvent (QHoverEvent *event)
	This event handler can be reimplemented in a subclass to receive hover-move events for an item.

virtual void	hoverLeaveEvent (QHoverEvent *event)
	This event handler can be reimplemented in a subclass to receive hover-leave events for an item.

virtual void	releaseResources ()
	This function is called when an item should release graphics resources which are not already managed by the nodes returned from QQuickItem::updatePaintNode().

virtual void	updatePolish ()
	This function should perform any layout as required for this item.

	QQuickItem (QQuickItemPrivate &dd, QQuickItem *parent=nullptr)

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
QQmlListProperty< QQuickTouchPoint >	touchPoints

int	minimumTouchPoints

int	maximumTouchPoints

bool	mouseEnabled

Properties inherited from QQuickItem
QQuickItem *	parent
	\qmlproperty Item QtQuick::Item::parent This property holds the visual parent of the item.

qreal	x
	\qmlproperty real QtQuick::Item::x \qmlproperty real QtQuick::Item::y \qmlproperty real QtQuick::Item::width \qmlproperty real QtQuick::Item::height

qreal	y
	Defines the item's y position relative to its parent.

qreal	z
	\qmlproperty real QtQuick::Item::z

qreal	width
	This property holds the width of this item.

qreal	height
	This property holds the height of this item.

qreal	opacity
	\qmlproperty real QtQuick::Item::opacity

bool	enabled
	\qmlproperty bool QtQuick::Item::enabled

bool	visible
	\qmlproperty bool QtQuick::Item::visible

Qt::FocusPolicy	focusPolicy
	\qmlproperty enumeration QtQuick::Item::focusPolicy

qreal	rotation
	\qmlproperty real QtQuick::Item::rotation This property holds the rotation of the item in degrees clockwise around its transformOrigin.

qreal	scale
	\qmlproperty real QtQuick::Item::scale This property holds the scale factor for this item.

TransformOrigin	transformOrigin
	\qmlproperty enumeration QtQuick::Item::transformOrigin This property holds the origin point around which scale and rotation transform.

QPointF	transformOriginPoint

QQmlListProperty< QQuickTransform >	transform
	\qmlproperty list<Transform> QtQuick::Item::transform This property holds the list of transformations to apply.

bool	smooth
	\qmlproperty bool QtQuick::Item::smooth

bool	antialiasing
	\qmlproperty bool QtQuick::Item::antialiasing

qreal	implicitWidth

qreal	implicitHeight

QObject *	containmentMask
	\qmlproperty QObject* QtQuick::Item::containmentMask

Properties inherited from QObject
QString	objectName
	the name of this object

Additional Inherited Members
Public Types inherited from QQuickItem
enum	Flag { ItemClipsChildrenToShape = 0x01 , ItemIsFocusScope = 0x04 , ItemHasContents = 0x08 , ItemAcceptsDrops = 0x10 , ItemIsViewport = 0x20 , ItemObservesViewport = 0x40 }
	\qmltype Item \instantiates QQuickItem \inherits QtObject \inqmlmodule QtQuick More...

enum	ItemChange { ItemChildAddedChange , ItemChildRemovedChange , ItemSceneChange , ItemVisibleHasChanged , ItemParentHasChanged , ItemOpacityHasChanged , ItemActiveFocusHasChanged , ItemRotationHasChanged , ItemAntialiasingHasChanged , ItemDevicePixelRatioHasChanged , ItemEnabledHasChanged }
	Used in conjunction with QQuickItem::itemChange() to notify the item about certain types of changes. More...

enum	TransformOrigin { TopLeft , Top , TopRight , Left , Center , Right , BottomLeft , Bottom , BottomRight }
	\variable QQuickItem::ItemChangeData::realValue The numeric value that has changed: \l {QQuickItem::opacity()}{opacity}, \l {QQuickItem::rotation()}{rotation}, or \l {QScreen::devicePixelRatio}{device pixel ratio}. More...

Public Slots inherited from QQuickItem
void	update ()
	Schedules a call to updatePaintNode() for this item.

Public Slots inherited from QObject
void	deleteLater ()
	\threadsafe

Public Attributes inherited from QQuickItem
const QSize &	targetSize = QSize())

qreal y	const

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 179 of file qquickmultipointtoucharea_p.h.

Member Enumeration Documentation

◆ RemapEventPoints

enum class QQuickMultiPointTouchArea::RemapEventPoints

strongprotected

Enumerator
No
ToLocal

Definition at line 259 of file qquickmultipointtoucharea_p.h.

Constructor & Destructor Documentation

◆ QQuickMultiPointTouchArea()

QQuickMultiPointTouchArea::QQuickMultiPointTouchArea ( QQuickItem * parent = nullptr )

\qmltype GestureEvent \instantiates QQuickGrabGestureEvent \inqmlmodule QtQuick

The parameter given with the gestureStarted signal.

The GestureEvent object has the current touch points, which you may choose to interpret as a gesture, and an invokable method to grab the involved points exclusively.

\qmlproperty real QtQuick::GestureEvent::dragThreshold

This property holds the system setting for the distance a finger must move before it is interpreted as a drag. It comes from QStyleHints::startDragDistance().

\qmlproperty list<TouchPoint> QtQuick::GestureEvent::touchPoints

This property holds the set of current touch points.

\qmlmethod QtQuick::GestureEvent::grab()

Acquires an exclusive grab of the mouse and all the \l touchPoints, and calls \l {QQuickItem::setKeepTouchGrab()}{setKeepTouchGrab()} and \l {QQuickItem::setKeepMouseGrab()}{setKeepMouseGrab()} so that any parent Item that \l {QQuickItem::filtersChildMouseEvents()}{filters} its children's events will not be allowed to take over the grabs.

\qmltype MultiPointTouchArea \instantiates QQuickMultiPointTouchArea \inqmlmodule QtQuick \inherits Item

Enables handling of multiple touch points.

A MultiPointTouchArea is an invisible item that is used to track multiple touch points.

The \l Item::enabled property is used to enable and disable touch handling. When disabled, the touch area becomes transparent to mouse and touch events.

By default, the mouse will be handled the same way as a single touch point, and items under the touch area will not receive mouse events because the touch area is handling them. But if the \l mouseEnabled property is set to false, it becomes transparent to mouse events so that another mouse-sensitive Item (such as a MouseArea) can be used to handle mouse interaction separately.

MultiPointTouchArea can be used in two ways:

\list

setting touchPoints to provide touch point objects with properties that can be bound to
using the onTouchUpdated or onPressed, onUpdated and onReleased handlers \endlist

While a MultiPointTouchArea can take exclusive ownership of certain touch points, it is also possible to have multiple MultiPointTouchAreas active at the same time, each operating on a different set of touch points.

See also: TouchPoint

\qmlsignal QtQuick::MultiPointTouchArea::pressed(list<TouchPoint> touchPoints)

This signal is emitted when new touch points are added. touchPoints is a list of these new points.

If minimumTouchPoints is set to a value greater than one, this signal will not be emitted until the minimum number of required touch points has been reached.

Note: If you use the touchPoints argument in your signal handler code, it's best to rename it in your formal parameter to avoid confusion with the touchPoints property (see \l{QML Coding Conventions}): \qml onPressed: (points) => console.log("pressed", points.length) \endqml

\qmlsignal QtQuick::MultiPointTouchArea::updated(list<TouchPoint> touchPoints)

This signal is emitted when existing touch points are updated. touchPoints is a list of these updated points.

Note: If you use the touchPoints argument in your signal handler code, it's best to rename it in your formal parameter to avoid confusion with the touchPoints property (see \l{QML Coding Conventions}): \qml onUpdated: (points) => console.log("updated", points.length) \endqml

\qmlsignal QtQuick::MultiPointTouchArea::released(list<TouchPoint> touchPoints)

This signal is emitted when existing touch points are removed. touchPoints is a list of these removed points.

Note: If you use the touchPoints argument in your signal handler code, it's best to rename it in your formal parameter to avoid confusion with the touchPoints property (see \l{QML Coding Conventions}): \qml onReleased: (points) => console.log("released", points.length) \endqml

\qmlsignal QtQuick::MultiPointTouchArea::canceled(list<TouchPoint> touchPoints)

This signal is emitted when new touch events have been canceled because another item stole the touch event handling.

This signal is for advanced use: it is useful when there is more than one MultiPointTouchArea that is handling input, or when there is a MultiPointTouchArea inside a \l Flickable. In the latter case, if you execute some logic in the onPressed signal handler and then start dragging, the \l Flickable may steal the touch handling from the MultiPointTouchArea. In these cases, to reset the logic when the MultiPointTouchArea has lost the touch handling to the \l Flickable, canceled should be handled in addition to \l released.

touchPoints is the list of canceled points.

Note: If you use the touchPoints argument in your signal handler code, it's best to rename it in your formal parameter to avoid confusion with the touchPoints property (see \l{QML Coding Conventions}): \qml onCanceled: (points) => console.log("canceled", points.length) \endqml

\qmlsignal QtQuick::MultiPointTouchArea::gestureStarted(GestureEvent gesture)

This signal is emitted when the global drag threshold has been reached.

This signal is typically used when a MultiPointTouchArea has been nested in a Flickable or another MultiPointTouchArea. When the threshold has been reached and the signal is handled, you can determine whether or not the touch area should grab the current touch points. By default they will not be grabbed; to grab them call gesture.grab(). If the gesture is not grabbed, the nesting Flickable, for example, would also have an opportunity to grab.

The gesture object also includes information on the current set of touchPoints and the dragThreshold.

\qmlsignal QtQuick::MultiPointTouchArea::touchUpdated(list<TouchPoint> touchPoints)

This signal is emitted when the touch points handled by the MultiPointTouchArea change. This includes adding new touch points, removing or canceling previous touch points, as well as updating current touch point data. touchPoints is the list of all current touch points.

\qmlproperty list<TouchPoint> QtQuick::MultiPointTouchArea::touchPoints

This property holds a set of user-defined touch point objects that can be bound to.

If mouseEnabled is true (the default) and the left mouse button is pressed while the mouse is over the touch area, the current mouse position will be one of these touch points.

In the following example, we have two small rectangles that follow our touch points.

import QtQuick
 
Rectangle {
    width: 400; height: 400
    MultiPointTouchArea {
        anchors.fill: parent
        touchPoints: [
            TouchPoint { id: point1 },
            TouchPoint { id: point2 }
        ]
    }
 
    Rectangle {
        width: 30; height: 30
        color: "green"
        x: point1.x
        y: point1.y
    }
 
    Rectangle {
        width: 30; height: 30
        color: "yellow"
        x: point2.x
        y: point2.y
    }
}

By default this property holds an empty list.

See also: TouchPoint

Definition at line 430 of file qquickmultipointtoucharea.cpp.

References QQuickItem::ItemHasContents, Qt::LeftButton, QQuickItem::setAcceptedMouseButtons(), QQuickItem::setAcceptHoverEvents(), QQuickItem::setAcceptTouchEvents(), QQuickItem::setFiltersChildMouseEvents(), and QQuickItem::setFlag().

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◆ ~QQuickMultiPointTouchArea()

QQuickMultiPointTouchArea::~QQuickMultiPointTouchArea ( )

Definition at line 449 of file qquickmultipointtoucharea.cpp.

References clearTouchLists().

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Member Function Documentation

◆ addTouchPoint() [1/2]

void QQuickMultiPointTouchArea::addTouchPoint ( const QEventPoint * p )

protected

Definition at line 708 of file qquickmultipointtoucharea.cpp.

References QList< T >::append(), QMap< Key, T >::insert(), QQuickTouchPoint::setInUse(), and updateTouchPoint().

Referenced by updateTouchData().

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◆ addTouchPoint() [2/2]

void QQuickMultiPointTouchArea::addTouchPoint ( const QMouseEvent * e )

protected

Definition at line 728 of file qquickmultipointtoucharea.cpp.

References QList< T >::append(), QEventPoint::id, QMap< Key, T >::insert(), QQuickTouchPoint::setInUse(), and updateTouchPoint().

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◆ addTouchPrototype()

void QQuickMultiPointTouchArea::addTouchPrototype ( QQuickTouchPoint * prototype )

protected

Definition at line 783 of file qquickmultipointtoucharea.cpp.

References QMap< Key, T >::insert(), QQuickTouchPoint::setPointId(), and QMap< Key, T >::size().

Referenced by touchPoint_append().

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◆ canceled

void QQuickMultiPointTouchArea::canceled ( const QList< QObject * > & points )

signal

◆ childMouseEventFilter()

bool QQuickMultiPointTouchArea::childMouseEventFilter	(	QQuickItem *	item,
		QEvent *	event )

overrideprotectedvirtual

Reimplement this method to filter the pointer events that are received by this item's children.

This method will only be called if filtersChildMouseEvents() is true.

Return true if the specified event should not be passed on to the specified child item, and false otherwise. If you return true, you should also \l {QEvent::accept()}{accept} or \l {QEvent::ignore()}{ignore} the event, to signal if event propagation should stop or continue. The event will, however, always be sent to all childMouseEventFilters up the parent chain.

Note: Despite the name, this function filters all QPointerEvent instances during delivery to all children (typically mouse, touch, and tablet events). When overriding this function in a subclass, we suggest writing generic event-handling code using only the accessors found in QPointerEvent. Alternatively you can switch on event->type() and/or event->device()->type() to handle different event types in different ways.; Filtering is just one way to share responsibility in case of gestural ambiguity (for example on press, you don't know whether the user will tap or drag). Another way is to call QPointerEvent::addPassiveGrabber() on press, so as to non-exclusively monitor the progress of the QEventPoint. In either case, the item or pointer handler that is monitoring can steal the exclusive grab later on, when it becomes clear that the gesture fits the pattern that it is expecting.

See also: setFiltersChildMouseEvents()

Reimplemented from QQuickItem.

Definition at line 958 of file qquickmultipointtoucharea.cpp.

References QQuickItem::childMouseEventFilter(), QQuickItemPrivate::get(), QQuickItem::isEnabled(), QQuickItem::isVisible(), QEvent::MouseButtonPress, QEvent::MouseButtonRelease, Qt::MouseEventSynthesizedByQt, QEvent::MouseMove, QEventPoint::Pressed, Q_FALLTHROUGH, sendMouseEvent(), shouldFilter(), ToLocal, QEvent::TouchBegin, QEvent::TouchEnd, QEvent::TouchUpdate, and updateTouchData().

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◆ clearTouchLists()

void QQuickMultiPointTouchArea::clearTouchLists ( )

protected

Definition at line 692 of file qquickmultipointtoucharea.cpp.

References QList< T >::clear(), and QMap< Key, T >::remove().

Referenced by ~QQuickMultiPointTouchArea(), and updateTouchData().

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◆ gestureStarted

void QQuickMultiPointTouchArea::gestureStarted ( QQuickGrabGestureEvent * gesture )

signal

Referenced by updateTouchData().

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◆ grabGesture()

void QQuickMultiPointTouchArea::grabGesture ( QPointingDevice * dev )

protected

Definition at line 551 of file qquickmultipointtoucharea.cpp.

References QPointingDevicePrivate::get(), QQuickItem::grabMouse(), it, QMap< Key, T >::keyBegin(), QMap< Key, T >::keyEnd(), QQuickItem::setKeepMouseGrab(), and QQuickItem::setKeepTouchGrab().

Referenced by updateTouchData().

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◆ maximumTouchPoints()

int QQuickMultiPointTouchArea::maximumTouchPoints ( ) const

Definition at line 489 of file qquickmultipointtoucharea.cpp.

◆ maximumTouchPointsChanged

void QQuickMultiPointTouchArea::maximumTouchPointsChanged ( )

signal

Referenced by setMaximumTouchPoints().

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◆ minimumTouchPoints()

int QQuickMultiPointTouchArea::minimumTouchPoints ( ) const

\qmlproperty int QtQuick::MultiPointTouchArea::minimumTouchPoints \qmlproperty int QtQuick::MultiPointTouchArea::maximumTouchPoints

These properties hold the range of touch points to be handled by the touch area.

These are convenience that allow you to, for example, have nested MultiPointTouchAreas, one handling two finger touches, and another handling three finger touches.

By default, all touch points within the touch area are handled.

If mouseEnabled is true, the mouse acts as a touch point, so it is also subject to these constraints: for example if maximumTouchPoints is two, you can use the mouse as one touch point and a finger as another touch point for a total of two.

Definition at line 476 of file qquickmultipointtoucharea.cpp.

◆ minimumTouchPointsChanged

void QQuickMultiPointTouchArea::minimumTouchPointsChanged ( )

signal

Referenced by setMinimumTouchPoints().

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◆ mouseEnabled()

bool QQuickMultiPointTouchArea::mouseEnabled ( ) const

inline

Definition at line 199 of file qquickmultipointtoucharea_p.h.

◆ mouseEnabledChanged

void QQuickMultiPointTouchArea::mouseEnabledChanged ( )

signal

Referenced by setMouseEnabled().

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◆ mouseMoveEvent()

void QQuickMultiPointTouchArea::mouseMoveEvent ( QMouseEvent * event )

overrideprotectedvirtual

This event handler can be reimplemented in a subclass to receive mouse move events for an item.

The event information is provided by the event parameter.

In order to receive mouse movement events, the preceding mouse press event must be accepted (by overriding \l mousePressEvent(), for example) and \l acceptedMouseButtons() must return the relevant mouse button.

\input item.qdocinc accepting-events

Reimplemented from QQuickItem.

Definition at line 843 of file qquickmultipointtoucharea.cpp.

References QList< T >::clear(), QQuickItem::isEnabled(), Qt::MouseEventNotSynthesized, Qt::MouseEventSynthesizedByQt, QQuickItem::mouseMoveEvent(), and updateTouchData().

Referenced by sendMouseEvent().

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◆ mousePressEvent()

void QQuickMultiPointTouchArea::mousePressEvent ( QMouseEvent * event )

overrideprotectedvirtual

This event handler can be reimplemented in a subclass to receive mouse press events for an item.

The event information is provided by the event parameter.

In order to receive mouse press events, \l acceptedMouseButtons() must return the relevant mouse button.

\input item.qdocinc accepting-events

Reimplemented from QQuickItem.

Definition at line 824 of file qquickmultipointtoucharea.cpp.

References QQuickItem::isEnabled(), Qt::LeftButton, Qt::MouseEventNotSynthesized, Qt::MouseEventSynthesizedByQt, QQuickItem::mousePressEvent(), QQuickItem::setKeepMouseGrab(), QMap< Key, T >::size(), and updateTouchData().

Referenced by sendMouseEvent().

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◆ mouseReleaseEvent()

void QQuickMultiPointTouchArea::mouseReleaseEvent ( QMouseEvent * event )

overrideprotectedvirtual

This event handler can be reimplemented in a subclass to receive mouse release events for an item.

The event information is provided by the event parameter.

In order to receive mouse release events, the preceding mouse press event must be accepted (by overriding \l mousePressEvent(), for example) and \l acceptedMouseButtons() must return the relevant mouse button.

\input item.qdocinc accepting-events

Reimplemented from QQuickItem.

Definition at line 857 of file qquickmultipointtoucharea.cpp.

References QQuickItem::isEnabled(), Qt::MouseEventNotSynthesized, Qt::MouseEventSynthesizedByQt, QQuickItem::mouseReleaseEvent(), QList< T >::removeAll(), QQuickTouchPoint::setInUse(), QQuickItem::setKeepMouseGrab(), and updateTouchData().

Referenced by sendMouseEvent().

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◆ mouseUngrabEvent()

void QQuickMultiPointTouchArea::mouseUngrabEvent ( )

overrideprotectedvirtual

This event handler can be reimplemented in a subclass to be notified when a mouse ungrab event has occurred on this item.

Reimplemented from QQuickItem.

Definition at line 904 of file qquickmultipointtoucharea.cpp.

◆ pressed

void QQuickMultiPointTouchArea::pressed ( const QList< QObject * > & points )

signal

Referenced by updateTouchData().

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◆ released

void QQuickMultiPointTouchArea::released ( const QList< QObject * > & points )

signal

Referenced by updateTouchData().

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◆ sendMouseEvent()

bool QQuickMultiPointTouchArea::sendMouseEvent ( QMouseEvent * event )

protected

Definition at line 914 of file qquickmultipointtoucharea.cpp.

References QQuickItem::contains(), QQuickItem::grabMouse(), QQuickItem::mapFromScene(), QEvent::MouseButtonPress, QEvent::MouseButtonRelease, Qt::MouseEventSynthesizedByQt, QEvent::MouseMove, mouseMoveEvent(), mousePressEvent(), mouseReleaseEvent(), oldPosition, QPointerEvent::point(), QSinglePointEvent::position(), QPointerEvent::setAccepted(), QQuickItem::setKeepMouseGrab(), QMutableSinglePointEvent::setSource(), QEvent::type(), QQuickItem::ungrabMouse(), and QQuickItem::window().

Referenced by childMouseEventFilter().

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◆ setMaximumTouchPoints()

void QQuickMultiPointTouchArea::setMaximumTouchPoints ( int num )

Definition at line 494 of file qquickmultipointtoucharea.cpp.

References emit, and maximumTouchPointsChanged().

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◆ setMinimumTouchPoints()

void QQuickMultiPointTouchArea::setMinimumTouchPoints ( int num )

Definition at line 481 of file qquickmultipointtoucharea.cpp.

References emit, and minimumTouchPointsChanged().

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◆ setMouseEnabled()

void QQuickMultiPointTouchArea::setMouseEnabled ( bool arg )

\qmlproperty bool QtQuick::MultiPointTouchArea::mouseEnabled

This property controls whether the MultiPointTouchArea will handle mouse events too. If it is true (the default), the touch area will treat the mouse the same as a single touch point; if it is false, the touch area will ignore mouse events and allow them to "pass through" so that they can be handled by other items underneath.

Definition at line 511 of file qquickmultipointtoucharea.cpp.

References arg, emit, and mouseEnabledChanged().

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◆ shouldFilter()

bool QQuickMultiPointTouchArea::shouldFilter ( QEvent * event )

protected

Definition at line 999 of file qquickmultipointtoucharea.cpp.

References QQuickItem::contains(), QQuickItem::isEnabled(), QQuickItem::mapFromScene(), QEvent::MouseButtonPress, QEvent::MouseButtonRelease, QEvent::MouseMove, QSinglePointEvent::scenePosition(), QEvent::TouchBegin, QEvent::TouchEnd, QEvent::TouchUpdate, and QQuickItem::window().

Referenced by childMouseEventFilter().

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◆ touchEvent()

void QQuickMultiPointTouchArea::touchEvent ( QTouchEvent * event )

overrideprotectedvirtual

This event handler can be reimplemented in a subclass to receive touch events for an item.

The event information is provided by the event parameter.

\input item.qdocinc accepting-events

Reimplemented from QQuickItem.

Definition at line 521 of file qquickmultipointtoucharea.cpp.

References item, QGraphicsItem::parentItem(), QEvent::TouchBegin, QEvent::TouchCancel, QEvent::TouchEnd, QQuickItem::touchEvent(), QEvent::TouchUpdate, updateTouchData(), and QQuickItem::window().

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◆ touchPoint_append()

static void QQuickMultiPointTouchArea::touchPoint_append	(	QQmlListProperty< QQuickTouchPoint > *	list,
		QQuickTouchPoint *	touch )

inlinestatic

Definition at line 206 of file qquickmultipointtoucharea_p.h.

References addTouchPrototype(), and list.

Referenced by touchPoints().

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◆ touchPoint_at()

static QQuickTouchPoint * QQuickMultiPointTouchArea::touchPoint_at	(	QQmlListProperty< QQuickTouchPoint > *	list,
		qsizetype	index )

inlinestatic

Definition at line 216 of file qquickmultipointtoucharea_p.h.

References list, and QMap< Key, T >::value().

Referenced by touchPoints().

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◆ touchPoint_count()

static qsizetype QQuickMultiPointTouchArea::touchPoint_count ( QQmlListProperty< QQuickTouchPoint > * list )

inlinestatic

Definition at line 211 of file qquickmultipointtoucharea_p.h.

References list, and QMap< Key, T >::size().

Referenced by touchPoints().

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◆ touchPoints()

QQmlListProperty< QQuickTouchPoint > QQuickMultiPointTouchArea::touchPoints ( )

inline

Definition at line 202 of file qquickmultipointtoucharea_p.h.

References touchPoint_append(), touchPoint_at(), and touchPoint_count().

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◆ touchUngrabEvent()

void QQuickMultiPointTouchArea::touchUngrabEvent ( )

overrideprotectedvirtual

This event handler can be reimplemented in a subclass to be notified when a touch ungrab event has occurred on this item.

Reimplemented from QQuickItem.

Definition at line 909 of file qquickmultipointtoucharea.cpp.

◆ touchUpdated

void QQuickMultiPointTouchArea::touchUpdated ( const QList< QObject * > & points )

signal

Referenced by updateTouchData().

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◆ updated

void QQuickMultiPointTouchArea::updated ( const QList< QObject * > & points )

signal

Referenced by updateTouchData().

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◆ updatePaintNode()

QSGNode * QQuickMultiPointTouchArea::updatePaintNode	(	QSGNode *	oldNode,
		UpdatePaintNodeData *	updatePaintNodeData )

overrideprotectedvirtual

Called on the render thread when it is time to sync the state of the item with the scene graph.

The function is called as a result of QQuickItem::update(), if the user has set the QQuickItem::ItemHasContents flag on the item.

The function should return the root of the scene graph subtree for this item. Most implementations will return a single QSGGeometryNode containing the visual representation of this item. oldNode is the node that was returned the last time the function was called. updatePaintNodeData provides a pointer to the QSGTransformNode associated with this QQuickItem.

QSGNode *MyItem::updatePaintNode(QSGNode *node, UpdatePaintNodeData *)
{
    QSGSimpleRectNode *n = static_cast<QSGSimpleRectNode *>(node);
    if (!n) {
        n = new QSGSimpleRectNode();
        n->setColor(Qt::red);
    }
    n->setRect(boundingRect());
    return n;
}

The main thread is blocked while this function is executed so it is safe to read values from the QQuickItem instance and other objects in the main thread.

If no call to QQuickItem::updatePaintNode() result in actual scene graph changes, like QSGNode::markDirty() or adding and removing nodes, then the underlying implementation may decide to not render the scene again as the visual outcome is identical.

Warning: It is crucial that graphics operations and interaction with the scene graph happens exclusively on the render thread, primarily during the QQuickItem::updatePaintNode() call. The best rule of thumb is to only use classes with the "QSG" prefix inside the QQuickItem::updatePaintNode() function.; This function is called on the render thread. This means any QObjects or thread local storage that is created will have affinity to the render thread, so apply caution when doing anything other than rendering in this function. Similarly for signals, these will be emitted on the render thread and will thus often be delivered via queued connections.

Note: All classes with QSG prefix should be used solely on the scene graph's rendering thread. See \l {Scene Graph and Rendering} for more information.