QGraphicsSceneWheelEvent Class
The QGraphicsSceneWheelEvent class provides wheel events in the graphics view framework. 更多...
| 头文件: | #include <QGraphicsSceneWheelEvent> |
| qmake: | QT += widgets |
| 开始支持版本: | Qt 4.2 |
| 基类: | QGraphicsSceneEvent |
公有函数
| ~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 个公有函数继承自 QGraphicsSceneEvent
- 6 个公有函数继承自 QEvent
其他继承的成员
详细描述
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()).
参见 QGraphicsSceneMouseEvent, QGraphicsSceneContextMenuEvent, QGraphicsSceneHoverEvent, and QWheelEvent.
成员函数
QGraphicsSceneWheelEvent::~QGraphicsSceneWheelEvent()
Destroys the QGraphicsSceneWheelEvent.
Qt::MouseButtons QGraphicsSceneWheelEvent::buttons() const
Returns the mouse buttons that were pressed when the wheel event occurred.
参见 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.
参见 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.
参见 scenePos() and screenPos().
QPointF QGraphicsSceneWheelEvent::scenePos() const
Returns the position of the cursor in scene coordinates when the wheel event occurred.
QPoint QGraphicsSceneWheelEvent::screenPos() const
Returns the position of the cursor in screen coordinates when the wheel event occurred.