The QGraphicsSceneHelpEvent class provides events when a tooltip is requested. 更多...
| 头： | #include <QGraphicsSceneHelpEvent> |
| qmake: | QT += widgets |
| Since: | Qt 4.2 |
| 继承： | QGraphicsSceneEvent |
| ~QGraphicsSceneHelpEvent () | |
| QPointF | scenePos () const |
| QPoint | screenPos () const |
The QGraphicsSceneHelpEvent class provides events when a tooltip is requested.
当 QGraphicsView 接收 QEvent 类型 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 类型 QEvent::WhatsThis to the scene.
另请参阅 QEvent .
销毁事件。
Returns the position of the mouse cursor in scene coordinates at the moment the help event was sent.
另请参阅 screenPos ().
Returns the position of the mouse cursor in screen coordinates at the moment the help event was sent.
另请参阅 scenePos ().
