The QEventPoint class provides information about a point in a QPointerEvent . 更多...
| 頭： | #include <QEventPoint> |
| CMake: |
find_package(Qt6 REQUIRED COMPONENTS Gui)
target_link_libraries(mytarget PRIVATE Qt6::Gui) |
| qmake: | QT += gui |
| Since: | Qt 6.0 |
| enum | State { Unknown, Stationary, Pressed, Updated, Released } |
| flags | States |
|
|
| QEventPoint (int pointId , QEventPoint::State state , const QPointF & scenePosition , const QPointF & globalPosition ) | |
| QEventPoint (const QEventPoint & other ) | |
| QEventPoint (QEventPoint && other ) | |
| ~QEventPoint () | |
| const QPointingDevice * | device () const |
| QSizeF | ellipseDiameters () const |
| QPointF | globalGrabPosition () const |
| QPointF | globalLastPosition () const |
| QPointF | globalPosition () const |
| QPointF | globalPressPosition () const |
| QPointF | grabPosition () const |
| int | id () const |
| bool | isAccepted () const |
| QPointF | lastPosition () const |
| ulong | lastTimestamp () const |
| QPointF | normalizedPosition () const |
| QPointF | position () const |
| QPointF | pressPosition () const |
| ulong | pressTimestamp () const |
| qreal | pressure () const |
| qreal | rotation () const |
| QPointF | sceneGrabPosition () const |
| QPointF | sceneLastPosition () const |
| QPointF | scenePosition () const |
| QPointF | scenePressPosition () const |
| void | setAccepted (bool accepted = true) |
| QEventPoint::State | state () const |
| qreal | timeHeld () const |
| ulong | timestamp () const |
| QPointingDeviceUniqueId | uniqueId () const |
| QVector2D | velocity () const |
| bool | operator!= (const QEventPoint & other ) const |
| QEventPoint & | operator= (const QEventPoint & other ) |
| QEventPoint & | operator= (QEventPoint && other ) |
| bool | operator== (const QEventPoint & other ) const |
Specifies the state of this event point.
| 常量 | 值 | 描述 |
|---|---|---|
QEventPoint::Unknown
|
Qt::TouchPointUnknownState
|
Unknown state. |
QEventPoint::Stationary
|
Qt::TouchPointStationary
|
The event point did not move. |
QEventPoint::Pressed
|
Qt::TouchPointPressed
|
The touch point or button is pressed. |
QEventPoint::Updated
|
Qt::TouchPointMoved
|
The event point was updated. |
QEventPoint::Released
|
Qt::TouchPointReleased
|
The touch point or button was released. |
The States type is a typedef for QFlags <State>。它存儲 State 值的 OR (或) 組閤。
This property holds the accepted state of the event point.
In widget-based applications, this property is not used, as it's only meaningful for a widget to accept or reject a complete QInputEvent .
In Qt Quick however, it's normal for an Item or Event Handler to accept only the individual points in a QTouchEvent that are actually participating in a gesture, while other points can be delivered to other items or handlers. For the sake of consistency, that applies to any QPointerEvent ; and delivery is done only when all points in a QPointerEvent have been accepted.
訪問函數：
| bool | isAccepted () const |
| void | setAccepted (bool accepted = true) |
另請參閱 QEvent::accepted .
[read-only]
device
:
QPointingDevice
* const
This property holds the pointing device from which this event point originates.
訪問函數：
| const QPointingDevice * | device () const |
[read-only]
ellipseDiameters
: const
QSizeF
This property holds the width and height of the bounding ellipse of the touch point.
The return value is in logical pixels. Most touchscreens do not detect the shape of the contact point, and no mice or tablet devices can detect it, so a null size is the most common value. On some touchscreens the diameters may be nonzero and always equal (the ellipse is approximated as a circle).
訪問函數：
| QSizeF | ellipseDiameters () const |
[read-only]
globalGrabPosition
: const
QPointF
This property holds the global position at which this point was grabbed.
The global position is relative to the screen or virtual desktop.
訪問函數：
| QPointF | globalGrabPosition () const |
另請參閱 globalPosition , grabPosition ，和 sceneGrabPosition .
[read-only]
globalLastPosition
: const
QPointF
This property holds the global position of this point from the previous press or move event.
The global position is relative to the screen or virtual desktop.
訪問函數：
| QPointF | globalLastPosition () const |
另請參閱 globalPosition , lastPosition ，和 sceneLastPosition .
[read-only]
globalPosition
: const
QPointF
This property holds the global position of this point.
The global position is relative to the screen or virtual desktop.
訪問函數：
| QPointF | globalPosition () const |
另請參閱 globalPressPosition , position ，和 scenePosition .
[read-only]
globalPressPosition
: const
QPointF
This property holds the global position at which this point was pressed.
The global position is relative to the screen or virtual desktop.
訪問函數：
| QPointF | globalPressPosition () const |
另請參閱 globalPosition , pressPosition ，和 scenePressPosition .
[read-only]
grabPosition
: const
QPointF
This property holds the position at which this point was grabbed.
The position is relative to the widget or item that received the event.
訪問函數：
| QPointF | grabPosition () const |
另請參閱 position .
[read-only]
id
: const
int
This property holds the ID number of this event point.
注意： Do not assume that ID numbers start at zero or that they are sequential. Such an assumption is often false due to the way the underlying drivers work.
訪問函數：
| int | id () const |
[read-only]
lastPosition
: const
QPointF
This property holds the position of this point from the previous press or move event.
The position is relative to the widget or item that received the event.
訪問函數：
| QPointF | lastPosition () const |
另請參閱 position and pressPosition .
[read-only]
lastTimestamp
: const
ulong
This property holds the time from the previous QPointerEvent that contained this point.
訪問函數：
| ulong | lastTimestamp () const |
另請參閱 globalLastPosition .
[read-only]
position
: const
QPointF
This property holds the position of this point.
The position is relative to the widget or item that received the event.
訪問函數：
| QPointF | position () const |
[read-only]
pressPosition
: const
QPointF
This property holds the position at which this point was pressed.
The position is relative to the widget or item that received the event.
訪問函數：
| QPointF | pressPosition () const |
另請參閱 position .
[read-only]
pressTimestamp
: const
ulong
This property holds the most recent time at which this point was pressed.
訪問函數：
| ulong | pressTimestamp () const |
另請參閱 timestamp .
[read-only]
pressure
: const
qreal
This property holds the pressure of this point.
The return value is in the range
0.0
to
1.0
.
訪問函數：
| qreal | pressure () const |
[read-only]
rotation
: const
qreal
This property holds the angular orientation of this point.
The return value is in degrees, where zero (the default) indicates the finger, token or stylus is pointing upwards, a negative angle means it's rotated to the left, and a positive angle means it's rotated to the right. Most touchscreens do not detect rotation, so zero is the most common value.
訪問函數：
| qreal | rotation () const |
[read-only]
sceneGrabPosition
: const
QPointF
This property holds the scene position at which this point was grabbed.
The scene position is the position relative to QQuickWindow if handled in QQuickItem::event (), in QGraphicsScene coordinates if handled by an override of QGraphicsItem::touchEvent(), or the window position in widget applications.
訪問函數：
| QPointF | sceneGrabPosition () const |
另請參閱 scenePosition , grabPosition ，和 globalGrabPosition .
[read-only]
sceneLastPosition
: const
QPointF
This property holds the scene position of this point from the previous press or move event.
The scene position is the position relative to QQuickWindow if handled in QQuickItem::event (), in QGraphicsScene coordinates if handled by an override of QGraphicsItem::touchEvent(), or the window position in widget applications.
訪問函數：
| QPointF | sceneLastPosition () const |
另請參閱 scenePosition and scenePressPosition .
[read-only]
scenePosition
: const
QPointF
This property holds the scene position of this point.
The scene position is the position relative to QQuickWindow if handled in QQuickItem::event (), in QGraphicsScene coordinates if handled by an override of QGraphicsItem::touchEvent(), or the window position in widget applications.
訪問函數：
| QPointF | scenePosition () const |
另請參閱 scenePressPosition , position ，和 globalPosition .
[read-only]
scenePressPosition
: const
QPointF
This property holds the scene position at which this point was pressed.
The scene position is the position relative to QQuickWindow if handled in QQuickItem::event (), in QGraphicsScene coordinates if handled by an override of QGraphicsItem::touchEvent(), or the window position in widget applications.
訪問函數：
| QPointF | scenePressPosition () const |
另請參閱 scenePosition , pressPosition ，和 globalPressPosition .
[read-only]
state
: const
State
This property holds the current state of the event point.
訪問函數：
| QEventPoint::State | state () const |
[read-only]
timeHeld
: const
qreal
This property holds the duration, in seconds, since this point was pressed and not released.
訪問函數：
| qreal | timeHeld () const |
另請參閱 pressTimestamp and timestamp .
[read-only]
timestamp
: const
ulong
This property holds the most recent time at which this point was included in a QPointerEvent .
訪問函數：
| ulong | timestamp () const |
另請參閱 QPointerEvent::timestamp ().
[read-only]
uniqueId
: const
QPointingDeviceUniqueId
This property holds the unique ID of this point or token, if any.
It is often invalid (see isValid ()), because touchscreens cannot uniquely identify fingers.
When it comes from a QTabletEvent , it identifies the serial number of the stylus in use.
It may identify a specific token (fiducial object) when the TUIO driver is in use with a touchscreen that supports them.
訪問函數：
| QPointingDeviceUniqueId | uniqueId () const |
[read-only]
velocity
: const
QVector2D
This property holds a velocity vector, in units of pixels per second, in the coordinate. system of the screen or desktop.
注意：
If the device's capabilities include
QInputDevice::Velocity
, it means velocity comes from the operating system (perhaps the touch hardware or driver provides it). But usually the
Velocity
capability is not set, indicating that the velocity is calculated by Qt, using a simple Kalman filter to provide a smoothed average velocity rather than an instantaneous value. Effectively it tells how fast and in what direction the user has been dragging this point over the last few events, with the most recent event having the strongest influence.
訪問函數：
| QVector2D | velocity () const |
另請參閱 QInputDevice::capabilities () 和 QInputEvent::device ().
Constructs an event point with the given pointId , state , scenePosition and globalPosition .
Constructs an event point by making a shallow copy of other .
Constructs an event point by moving other .
Destroys the event point.
Returns the normalized position of this point.
The coordinates are calculated by transforming
globalPosition
() into the space of
QInputDevice::availableVirtualGeometry
(), i.e.
(0, 0)
is the top-left corner and
(1, 1)
is the bottom-right corner.
另請參閱 globalPosition .
返迴
true
if this event point is not equal to
other
, otherwise return
false
.
賦值 other to this event point and returns a reference to this event point.
移動賦值 other to this event point instance.
返迴
true
if this event point is equal to
other
, otherwise return
false
.