内容

• 公共函数
• 详细描述

QGraphicsSceneHelpEvent 类

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

• 所有成员列表，包括继承成员

公共函数

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

• 1 公共函数继承自 QGraphicsSceneEvent
• 6 公共函数继承自 QEvent

额外继承成员

• 1 特性继承自 QEvent
• 1 静态公共成员继承自 QEvent

详细描述

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 .

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 ().