QGraphicsSceneHelpEvent Class
The QGraphicsSceneHelpEvent class provides events when a tooltip is requested. 更多...
| 头文件: | #include <QGraphicsSceneHelpEvent> |
| qmake: | QT += widgets |
| 开始支持版本: | Qt 4.2 |
| 基类: | QGraphicsSceneEvent |
公有函数
| ~QGraphicsSceneHelpEvent() | |
| 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 QGraphicsSceneHelpEvent class provides events when a tooltip is requested.
When a QGraphicsView receives a QEvent of type QEvent::ToolTip, it creates a QGraphicsSceneHelpEvent, which is forwarded to the scene. You can set a tooltip on a QGraphicsItem with setToolTip(); by default QGraphicsScene displays the tooltip of the QGraphicsItem with the highest z-value (i.e, the top-most item) under the mouse position.
QGraphicsView does not forward events when "What's This" and status tip help is requested. If you need this, you can reimplement QGraphicsView::viewportEvent() and forward QStatusTipEvent events and QEvents of type QEvent::WhatsThis to the scene.
参见 QEvent.
成员函数
QGraphicsSceneHelpEvent::~QGraphicsSceneHelpEvent()
Destroys the event.
QPointF QGraphicsSceneHelpEvent::scenePos() const
Returns the position of the mouse cursor in scene coordinates at the moment the help event was sent.
参见 screenPos().
QPoint QGraphicsSceneHelpEvent::screenPos() const
Returns the position of the mouse cursor in screen coordinates at the moment the help event was sent.
参见 scenePos().