QNativeGestureEvent 类包含手势事件的描述参数。 更多...
| 头： | #include <QNativeGestureEvent> |
| CMake: |
find_package(Qt6 COMPONENTS Gui REQUIRED)
target_link_libraries(mytarget PRIVATE Qt6::Gui) |
| qmake: | QT += gui |
| Since: | Qt 5.2 |
| 继承： | QSinglePointEvent |
| QNativeGestureEvent (Qt::NativeGestureType type , const QPointingDevice * device , int fingerCount , const QPointF & localPos , const QPointF & scenePos , const QPointF & globalPos , qreal value , const QPointF & delta , quint64 sequenceId = UINT64_MAX) | |
| QPointF | delta () const |
| int | fingerCount () const |
| Qt::NativeGestureType | gestureType () const |
| qreal | value () const |
Native gesture events are generated by the operating system, typically by interpreting trackpad touch events. Gesture events are high-level events such as zoom, rotate or pan. Several types hold incremental values: that is, value () 和 delta () provide the difference from the previous event to the current event.
| 事件类型 | 描述 | Touch sequence |
|---|---|---|
| Qt::ZoomNativeGesture | 放大增量 (以百分比为单位)。 | macOS and Wayland: Two-finger pinch. |
| Qt::SmartZoomNativeGesture | 布尔放大状态。 | macOS：2 指双击 (触摸板)/单指双击 (魔法鼠标)。 |
| Qt::RotateNativeGesture | 旋转增量 (以度为单位)。 | macOS and Wayland: Two-finger rotate. |
| Qt::SwipeNativeGesture | Swipe angle in degrees. | macOS: Configurable in trackpad settings. |
| Qt::PanNativeGesture | Displacement delta in pixels. | Wayland: Three or more fingers moving as a group, in any direction. |
此外，BeginNativeGesture 和 EndNativeGeature 在手势事件流之前和之后发送：
BeginNativeGesture ZoomNativeGesture ZoomNativeGesture ZoomNativeGesture EndNativeGesture
The event stream may include interleaved gestures of different types: for example the two-finger pinch gesture generates a stream of Zoom and Rotate events, and PanNativeGesture may sometimes be interleaved with those, depending on the platform.
Other types are standalone events: SmartZoomNativeGesture and SwipeNativeGesture occur only once each time the gesture is detected.
注意： On a touchpad, moving two fingers as a group (the two-finger flick gesture) is usually reserved for scrolling; in that case, Qt generates QWheelEvents. This is the reason that three or more fingers are needed to generate a PanNativeGesture.
另请参阅 Qt::NativeGestureType , QGestureEvent ，和 QWheelEvent .
[since 6.2]
QNativeGestureEvent::
QNativeGestureEvent
(
Qt::NativeGestureType
type
, const
QPointingDevice
*
device
,
int
fingerCount
, const
QPointF
&
localPos
, const
QPointF
&
scenePos
, const
QPointF
&
globalPos
,
qreal
value
, const
QPointF
&
delta
,
quint64
sequenceId
= UINT64_MAX)
构造本机手势事件为类型 type originating from device describing a gesture at scenePos in which fingerCount fingers are involved.
点 localPos , scenePos and globalPos specify the gesture position relative to the receiving widget or item, window, and screen or desktop, respectively.
value has a gesture-dependent interpretation: for RotateNativeGesture or SwipeNativeGesture, it's an angle in degrees. For ZoomNativeGesture, value is an incremental scaling factor, usually much less than 1, indicating that the target item should have its scale adjusted like this: item.scale = item.scale * (1 + event.value)
For PanNativeGesture, delta gives the distance in pixels that the viewport, widget or item should be moved or panned.
注意： delta is stored in single precision ( QVector2D ), so delta () may return slightly different values in some cases. This is subject to change in future versions of Qt.
该函数在 Qt 6.2 引入。
[since 6.2]
QPointF
QNativeGestureEvent::
delta
() const
Returns the distance moved since the previous event, in pixels. A Pan gesture provides the distance in pixels by which the target widget, item or viewport contents should be moved.
该函数在 Qt 6.2 引入。
另请参阅 QPanGesture::delta ().
[since 6.2]
int
QNativeGestureEvent::
fingerCount
() const
Returns the number of fingers participating in the gesture, if known. When
gestureType
() 是
Qt::BeginNativeGesture
or
Qt::EndNativeGesture
, often this information is unknown, and fingerCount() returns
0
.
该函数在 Qt 6.2 引入。
[since 5.2]
Qt::NativeGestureType
QNativeGestureEvent::
gestureType
() const
返回手势类型。
该函数在 Qt 5.2 引入。
[since 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 delta while a Rotate gesture provides a rotation delta.
该函数在 Qt 5.2 引入。
另请参阅 QNativeGestureEvent and gestureType ().