CGenericTouchPinchDetector Class Reference

Implementation of IGenericTouchGestureDetector to detect pinch/zoom gestures with at least two active touch pointers. More...

#include <GenericTouchPinchDetector.h>

Inheritance diagram for CGenericTouchPinchDetector:

Public Member Functions
	CGenericTouchPinchDetector (ITouchActionHandler *handler, float dpi)
	~CGenericTouchPinchDetector () override=default
bool	OnTouchDown (unsigned int index, const Pointer &pointer) override
	A new touch pointer has been recognised.
bool	OnTouchUp (unsigned int index, const Pointer &pointer) override
	An active touch pointer has vanished.
bool	OnTouchMove (unsigned int index, const Pointer &pointer) override
	An active touch pointer has moved.
Public Member Functions inherited from IGenericTouchGestureDetector
	IGenericTouchGestureDetector (ITouchActionHandler *handler, float dpi)
	~IGenericTouchGestureDetector () override=default
bool	IsDone ()
	Check whether the gesture recognition is finished or not.
virtual bool	OnTouchUpdate (unsigned int index, const Pointer &pointer)
	An active touch pointer's values have been updated but no event has occurred.
Public Member Functions inherited from ITouchInputHandling
	ITouchInputHandling ()
	~ITouchInputHandling () override=default
void	RegisterHandler (ITouchActionHandler *touchHandler)
	Register a touch input handler.
void	UnregisterHandler ()
	Unregister the previously registered touch handler.

Additional Inherited Members
Static Public Attributes inherited from IGenericTouchGestureDetector
static constexpr int	MAX_POINTERS = 2
Protected Member Functions inherited from ITouchInputHandling
void	OnTouchAbort () override
	A touch action has been aborted.
bool	OnSingleTouchStart (float x, float y) override
	A single touch has started.
bool	OnSingleTouchHold (float x, float y) override
	A single touch has been held down for a certain amount of time.
bool	OnSingleTouchMove (float x, float y, float offsetX, float offsetY, float velocityX, float velocityY) override
	A single touch has moved.
bool	OnSingleTouchEnd (float x, float y) override
	A single touch has been lifted.
bool	OnMultiTouchDown (float x, float y, int32_t pointer) override
	An additional touch has been performed.
bool	OnMultiTouchHold (float x, float y, int32_t pointers=2) override
	Multiple simultaneous touches have been held down for a certain amount of time.
bool	OnMultiTouchMove (float x, float y, float offsetX, float offsetY, float velocityX, float velocityY, int32_t pointer) override
	A touch has moved.
bool	OnMultiTouchUp (float x, float y, int32_t pointer) override
	A touch has been lifted (but there are still active touches)
bool	OnTouchGestureStart (float x, float y) override
	A pan gesture with a single touch has been started.
bool	OnTouchGesturePan (float x, float y, float offsetX, float offsetY, float velocityX, float velocityY) override
	A pan gesture with a single touch is in progress.
bool	OnTouchGestureEnd (float x, float y, float offsetX, float offsetY, float velocityX, float velocityY) override
	A pan gesture with a single touch has ended.
void	OnTap (float x, float y, int32_t pointers=1) override
	A tap with a one or more touches has been performed.
void	OnLongPress (float x, float y, int32_t pointers=1) override
	One or more touches have been held down for a certain amount of time.
void	OnSwipe (TouchMoveDirection direction, float xDown, float yDown, float xUp, float yUp, float velocityX, float velocityY, int32_t pointers=1) override
	One or more touches has been moved quickly in a single direction in a short time.
void	OnZoomPinch (float centerX, float centerY, float zoomFactor) override
	Two simultaneous touches have been held down and moved to perform a zooming/pinching gesture.
void	OnRotate (float centerX, float centerY, float angle) override
	Two simultaneous touches have been held down and moved to perform a rotating gesture.
Protected Member Functions inherited from ITouchActionHandler
virtual	~ITouchActionHandler ()=default
Protected Attributes inherited from IGenericTouchGestureDetector
bool	m_done = false
	Whether the gesture recognition is finished or not.
float	m_dpi
	DPI value of the touch screen.
std::array< Pointer, MAX_POINTERS >	m_pointers
	Local list of all known touch pointers.

Detailed Description

Implementation of IGenericTouchGestureDetector to detect pinch/zoom gestures with at least two active touch pointers.

See also

IGenericTouchGestureDetector

Constructor & Destructor Documentation

CGenericTouchPinchDetector()

CGenericTouchPinchDetector::CGenericTouchPinchDetector ( ITouchActionHandler * handler, float dpi )

inline

~CGenericTouchPinchDetector()

CGenericTouchPinchDetector::~CGenericTouchPinchDetector ( )

overridedefault

Member Function Documentation

OnTouchDown()

bool CGenericTouchPinchDetector::OnTouchDown ( unsigned int index, const Pointer & pointer )

overridevirtual

A new touch pointer has been recognised.

Parameters

index	Index of the given touch pointer
pointer	Touch pointer that has changed

Returns

True if the event was handled otherwise false

Implements IGenericTouchGestureDetector.

OnTouchMove()

bool CGenericTouchPinchDetector::OnTouchMove ( unsigned int index, const Pointer & pointer )

overridevirtual

An active touch pointer has moved.

Parameters

index	Index of the given touch pointer
pointer	Touch pointer that has changed

Returns

True if the event was handled otherwise false

Reimplemented from IGenericTouchGestureDetector.

OnTouchUp()

bool CGenericTouchPinchDetector::OnTouchUp ( unsigned int index, const Pointer & pointer )

overridevirtual

An active touch pointer has vanished.

If the first touch pointer is lifted and there are more active touch pointers, the remaining pointers change their index.

Parameters

index	Index of the given touch pointer
pointer	Touch pointer that has changed

Returns

True if the event was handled otherwise false

Reimplemented from IGenericTouchGestureDetector.

---

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

• GenericTouchPinchDetector.h
• GenericTouchPinchDetector.cpp