- Qt 5.15
- Qt GUI
- C++ Classes
- QNativeGestureEvent
- Qt 5.15.18 Reference Documentation

# QNativeGestureEvent Class

The QNativeGestureEvent class contains parameters that describe a gesture event. More...

Header: | #include <QNativeGestureEvent>
qmake: | QT += gui
Since: | Qt 5.2
Inherits: | QInputEvent

This class was introduced in Qt 5.2.

- List of all members, including inherited members
- Obsolete members

## Public Functions

| QNativeGestureEvent(Qt::NativeGestureType type, const QTouchDevice *device, const QPointF &localPos, const QPointF &windowPos, const QPointF &screenPos, qreal realValue, ulong sequenceId, quint64 intValue)
const QTouchDevice * | device() const
Qt::NativeGestureType | gestureType() const
const QPoint | globalPos() const
const QPointF & | localPos() const
const QPoint | pos() const
const QPointF & | screenPos() const
qreal | value() const
const QPointF & | windowPos() const

## Detailed Description

Native gesture events are generated by the operating system, typically by interpreting touch events. Gesture events are high-level events such as zoom or rotate.

Event Type | Description | Touch sequence
--- | --- | ---
Qt::ZoomNativeGesture | Magnification delta in percent. | macOS: Two-finger pinch.
Qt::SmartZoomNativeGesture | Boolean magnification state. | macOS: Two-finger douple tap (trackpad) / One-finger douple tap (magic mouse).
Qt::RotateNativeGesture | Rotation delta in degrees. | macOS: Two-finger rotate.

In addition, BeginNativeGesture and EndNativeGesture are sent before and after gesture event streams:

BeginNativeGesture ZoomNativeGesture ZoomNativeGesture ZoomNativeGesture EndNativeGesture

See also Qt::NativeGestureType and QGestureEvent.

## Member Function Documentation

### QNativeGestureEvent::QNativeGestureEvent(Qt::NativeGestureType type, const QTouchDevice *device, const QPointF &localPos, const QPointF &windowPos, const QPointF &screenPos, qreal realValue, ulong sequenceId, quint64 intValue)

Constructs a native gesture event of type type originating from device.

The points localPos, windowPos and screenPos specify the gesture position relative to the receiving widget or item, window, and screen, respectively.

realValue is the macOS event parameter, sequenceId and intValue are the Windows event parameters.

This function was introduced in Qt 5.10.

### const QTouchDevice *QNativeGestureEvent::device() const

Returns the device.

This function was introduced in Qt 5.10.

### Qt::NativeGestureType QNativeGestureEvent::gestureType() const

Returns the gesture type.

This function was introduced in Qt 5.2.

### const QPoint QNativeGestureEvent::globalPos() const

Returns the position of the gesture as a QPointF in screen coordinates

This function was introduced in Qt 5.2.

### const QPointF &QNativeGestureEvent::localPos() const

Returns the position of the gesture as a QPointF, relative to the widget or item that received the event.

This function was introduced in Qt 5.2.

### const QPoint QNativeGestureEvent::pos() const

Returns the position of the mouse cursor, relative to the widget or item that received the event.

This function was introduced in Qt 5.2.

### const QPointF &QNativeGestureEvent::screenPos() const

Returns the position of the gesture as a QPointF in screen coordinates.

This function was introduced in Qt 5.2.

### qreal QNativeGestureEvent::value() const

Returns the gesture value. The value should be interpreted based on the gesture type. For example, a Zoom gesture provides a scale factor while a Rotate gesture provides a rotation delta.

This function was introduced in Qt 5.2.

See also QNativeGestureEvent and gestureType().

### const QPointF &QNativeGestureEvent::windowPos() const

Returns the position of the gesture as a QPointF, relative to the window that received the event.

This function was introduced in Qt 5.2.