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QGraphicsSceneWheelEvent Class Reference
^{[модуль QtGui ]}

The QGraphicsSceneWheelEvent class provides wheel events in the graphics view framework. Далее...

 #include <QGraphicsSceneWheelEvent>

Inherits QGraphicsSceneEvent.

Класс был добавлен в Qt 4.2.

• Список всех членов, включая унаследованные

Открытые функции

• ~QGraphicsSceneWheelEvent ()
• Qt::MouseButtons buttons () const
• int delta () const
• Qt::KeyboardModifiers modifiers () const
• Qt::Orientation orientation () const
• QPointF pos () const
• QPointF scenePos () const
• QPoint screenPos () const

• 1 public function inherited from QGraphicsSceneEvent
• 6 public functions inherited from QEvent

Дополнительные унаследованные члены

• 1 property inherited from QEvent

Подробное описание

The QGraphicsSceneWheelEvent class provides wheel events in the graphics view framework.

The QGraphicsSceneWheelEvent class provides wheel events in the graphics view framework.

QWheelEvents received by a QGraphicsView are translated into QGraphicsSceneWheelEvents; it translates the QWheelEvent::globalPos() into item, scene, and screen coordinates ( pos(), scenePos(), and screenPos()).

See also QGraphicsSceneMouseEvent, QGraphicsSceneContextMenuEvent, QGraphicsSceneHoverEvent, and QWheelEvent.

Описание функций-членов

QGraphicsSceneWheelEvent::~QGraphicsSceneWheelEvent ()

Destroys the QGraphicsSceneWheelEvent.

Qt::MouseButtons QGraphicsSceneWheelEvent::buttons () const

Returns the mouse buttons that were pressed when the wheel event occurred.

See also modifiers().

int QGraphicsSceneWheelEvent::delta () const

Returns the distance that the wheel is rotated, in eighths (1/8s) of a degree. A positive value indicates that the wheel was rotated forwards away from the user; a negative value indicates that the wheel was rotated backwards toward the user.

Most mouse types work in steps of 15 degrees, in which case the delta value is a multiple of 120 (== 15 * 8).

Qt::KeyboardModifiers QGraphicsSceneWheelEvent::modifiers () const

Returns the keyboard modifiers that were active when the wheel event occurred.

See also buttons().

Qt::Orientation QGraphicsSceneWheelEvent::orientation () const

Returns the wheel orientation.

QPointF QGraphicsSceneWheelEvent::pos () const

Returns the position of the cursor in item coordinates when the wheel event occurred.

See also scenePos() and screenPos().

QPointF QGraphicsSceneWheelEvent::scenePos () const

Returns the position of the cursor in item coordinates when the wheel event occurred.

See also pos() and screenPos().

QPoint QGraphicsSceneWheelEvent::screenPos () const

Returns the position of the cursor in screen coordinates when the wheel event occurred.

See also pos() and scenePos().