QPinchGestureRecognizer Class Reference

#include <qstandardgestures_p.h>

Inheritance diagram for QPinchGestureRecognizer:

Collaboration diagram for QPinchGestureRecognizer:

Public Member Functions
	QPinchGestureRecognizer ()
QGesture *	create (QObject *target) override
	This function is called by Qt to create a new QGesture object for the given target (QWidget or QGraphicsObject).
QGestureRecognizer::Result	recognize (QGesture *state, QObject *watched, QEvent *event) override
	Handles the given event for the watched object, updating the state of the gesture object as required, and returns a suitable result for the current recognition step.
void	reset (QGesture *state) override
	This function is called by the framework to reset a given gesture.
Public Member Functions inherited from QGestureRecognizer
	QGestureRecognizer ()
	Constructs a new gesture recognizer object.
virtual	~QGestureRecognizer ()
	Destroys the gesture recognizer.

Additional Inherited Members
Public Types inherited from QGestureRecognizer
enum	ResultFlag {   Ignore = 0x0001 , MayBeGesture = 0x0002 , TriggerGesture = 0x0004 , FinishGesture = 0x0008 ,   CancelGesture = 0x0010 , ResultState_Mask = 0x00ff , ConsumeEventHint = 0x0100 , ResultHint_Mask = 0xff00 }
	This enum describes the result of the current event filtering step in a gesture recognizer state machine. More...
Static Public Member Functions inherited from QGestureRecognizer
static Qt::GestureType	registerRecognizer (QGestureRecognizer *recognizer)
	Registers the given recognizer in the gesture framework and returns a gesture ID for it.
static void	unregisterRecognizer (Qt::GestureType type)
	Unregisters all gesture recognizers of the specified type.

Detailed Description

Definition at line 39 of file qstandardgestures_p.h.

Constructor & Destructor Documentation

QPinchGestureRecognizer()

QPinchGestureRecognizer::QPinchGestureRecognizer

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Definition at line 112 of file qstandardgestures.cpp.

Member Function Documentation

create()

QGesture * QPinchGestureRecognizer::create ( QObject * target )

overridevirtual

This function is called by Qt to create a new QGesture object for the given target (QWidget or QGraphicsObject).

Reimplement this function to create a custom QGesture-derived gesture object if necessary.

The application takes ownership of the created gesture object.

Reimplemented from QGestureRecognizer.

Definition at line 116 of file qstandardgestures.cpp.

References setAttribute(), and Qt::WA_AcceptTouchEvents.

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recognize()

QGestureRecognizer::Result QPinchGestureRecognizer::recognize ( QGesture * gesture, QObject * watched, QEvent * event )

overridevirtual

Handles the given event for the watched object, updating the state of the gesture object as required, and returns a suitable result for the current recognition step.

This function is called by the framework to allow the recognizer to filter input events dispatched to QWidget or QGraphicsObject instances that it is monitoring.

The result reflects how much of the gesture has been recognized. The state of the gesture object is set depending on the result.

See also

QGestureRecognizer::Result

Implements QGestureRecognizer.

Definition at line 124 of file qstandardgestures.cpp.

References QLineF::angle(), QGestureRecognizer::CancelGesture, QPinchGesture::CenterPointChanged, d, QGestureRecognizer::FinishGesture, QGestureRecognizer::Ignore, kSingleStepScaleMax, kSingleStepScaleMin, QString::length(), line, QGestureRecognizer::MayBeGesture, Qt::NoGesture, p1, p2, QPinchGesture::RotationAngleChanged, QPinchGesture::ScaleFactorChanged, state, QEvent::TouchBegin, QEvent::TouchEnd, QEvent::TouchUpdate, and QGestureRecognizer::TriggerGesture.

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reset()

void QPinchGestureRecognizer::reset ( QGesture * gesture )

overridevirtual

This function is called by the framework to reset a given gesture.

Reimplement this function to implement additional requirements for custom QGesture objects. This may be necessary if you implement a custom QGesture whose properties need special handling when the gesture is reset.

Reimplemented from QGestureRecognizer.

Definition at line 216 of file qstandardgestures.cpp.

References d, QGestureRecognizer::reset(), state, and QPinchGesture::totalChangeFlags.

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

• qtbase/src/widgets/kernel/qstandardgestures_p.h (05fc3aef53348fb58be6308076e000825b704e58)
• qtbase/src/widgets/kernel/qstandardgestures.cpp (05fc3aef53348fb58be6308076e000825b704e58)