QGraphicsSceneHelpEvent 类

QGraphicsSceneHelpEvent 类提供当请求工具提示时的事件。 更多...

头: #include <QGraphicsSceneHelpEvent>
qmake: QT += widgets
Since: Qt 4.2
继承: QGraphicsSceneEvent

该类在 Qt 4.2 引入。

公共函数

virtual ~QGraphicsSceneHelpEvent ()
QPointF scenePos () const
QPoint screenPos () const

详细描述

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 .

成员函数文档编制

[虚拟] QGraphicsSceneHelpEvent:: ~QGraphicsSceneHelpEvent ()

销毁事件。

QPointF QGraphicsSceneHelpEvent:: scenePos () const

Returns the position of the mouse cursor in scene coordinates at the moment the help event was sent.

另请参阅 screenPos ().

QPoint QGraphicsSceneHelpEvent:: screenPos () const

Returns the position of the mouse cursor in screen coordinates at the moment the help event was sent.

另请参阅 scenePos ().