QGraphicsSceneHelpEvent Class
QGraphicsSceneHelpEvent 类在请求显示工具提示时会触发事件。更多内容...
| 头文件： | #include <QGraphicsSceneHelpEvent> |
| CMake： | find_package(Qt6 REQUIRED COMPONENTS Widgets) target_link_libraries(mytarget PRIVATE Qt6::Widgets) |
| qmake: | QT += widgets |
| 继承自： | QGraphicsSceneEvent |
公共函数
| virtual | ~QGraphicsSceneHelpEvent() |
| QPointF | scenePos() const |
| QPoint | screenPos() const |
详细描述
当QGraphicsView 接收到类型为QEvent::ToolTip 的QEvent 时，它会创建一个QGraphicsSceneHelpEvent，并将该事件转发给场景。您可以通过setToolTip()为QGraphicsItem 设置工具提示；默认情况下，QGraphicsScene 会显示鼠标位置下方z值最高（即最顶层）的QGraphicsItem 的工具提示。
QGraphicsView 当调用"What's This" 和status tip 请求帮助时，不会转发事件。如果需要此功能，可以重写QGraphicsView::viewportEvent() 方法，并将QStatusTipEvent 事件以及类型为QEvent::WhatsThis 的QEvents 转发至场景。
另请参阅 QEvent 。
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