Detailed Description
The QGraphicsSceneWheelEvent class provides wheel events in the graphics view framework.
QWheelEvents received by a QGraphicsView are translated into QGraphicsSceneWheelEvents. The QWheelEvent::globalPos() is translated into item, scene, and screen coordinates (pos(), scenePos(), and screenPos()).
See also QGraphicsSceneMouseEvent, QGraphicsSceneContextMenuEvent, QGraphicsSceneHoverEvent, and QWheelEvent.
Member Function Documentation
QGraphicsSceneWheelEvent::~QGraphicsSceneWheelEvent ()
Destroys the QGraphicsSceneWheelEvent.
Qt::MouseButtons QGraphicsSceneWheelEvent::buttons () const
Returns the mouse buttons that were pressed when the wheel event occurred.
See also setButtons() and 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).
See also setDelta().
Qt::KeyboardModifiers QGraphicsSceneWheelEvent::modifiers () const
Returns the keyboard modifiers that were active when the wheel event occurred.
See also setModifiers() and buttons().
QPointF QGraphicsSceneWheelEvent::pos () const
Returns the position of the cursor in item coordinates when the wheel event occurred.
See also setPos(), scenePos(), and screenPos().
QPointF QGraphicsSceneWheelEvent::scenePos () const
Returns the position of the cursor in item coordinates when the wheel event occurred.
See also setScenePos(), pos(), and screenPos().
QPoint QGraphicsSceneWheelEvent::screenPos () const
Returns the position of the cursor in screen coordinates when the wheel event occurred.
See also setScreenPos(), pos(), and scenePos().
