QGraphicsSceneEvent 类

QGraphicsSceneEvent 类提供基类为所有图形视图相关事件。更多...

头：	#include <QGraphicsSceneEvent>
CMake:	find_package(Qt6 COMPONENTS Widgets REQUIRED) target_link_libraries(mytarget PRIVATE Qt6::Widgets)
qmake:	QT += widgets
继承：	QEvent
继承者：	QGraphicsSceneContextMenuEvent , QGraphicsSceneDragDropEvent , QGraphicsSceneHelpEvent , QGraphicsSceneHoverEvent , QGraphicsSceneMouseEvent , QGraphicsSceneMoveEvent , QGraphicsSceneResizeEvent ，和 QGraphicsSceneWheelEvent

公共函数

当 QGraphicsView 接收 Qt 鼠标、键盘及拖放事件 ( QMouseEvent , QKeyEvent ，QDragEvent，等)，它将它们翻译成 QGraphicsSceneEvent 子类实例并将它们转发给 QGraphicsScene 由它显示。然后，场景将事件转发给相关项。

例如，当 QGraphicsView 接收 QMouseEvent of type MousePress as a response to a user click, the view sends a QGraphicsSceneMouseEvent of type GraphicsSceneMousePress to the underlying QGraphicsScene through its mousePressEvent() function. The default QGraphicsScene::mousePressEvent () implementation determines which item was clicked and forwards the event to QGraphicsItem::mousePressEvent ().

Subclasses such as QGraphicsSceneMouseEvent and QGraphicsSceneContextMenuEvent provide the coordinates from the original QEvent in screen, scene, and item coordinates (see screenPos() , scenePos() ，和 pos() ). The item coordinates are set by the QGraphicsScene before it forwards the event to the event to a QGraphicsItem . The mouse events also add the possibility to retrieve the coordinates from the last event received by the view (see lastScreenPos() , lastScenePos() ，和 lastPos() ).

另请参阅 QEvent .

销毁事件。

Returns the timestamp of the original event, or 0 if the original event does not report a time stamp.

该函数在 Qt 6.2 引入。

Returns the widget where the event originated, or nullptr if the event originates from another application.