1.一定要将public QObject放在public QGraphicsItem的前面,并且在该类的定义中添加Q_OBJECT宏. 1 classXXGraphicsItem :publicQObject,publicQGraphicsItem 编译时出现警告 Warning: Class Node implements the interface QGraphicsItem but does not list it in Q_INTERFACES. qobject_cast to QGraphicsItem will n...
1. void mouseMoveEvent(QGraphicsSceneMouseEvent *event); 1. void mouseReleaseEvent(QGraphicsSceneMouseEvent *event); 1. void hoverEnterEvent(QGraphicsSceneHoverEvent *event); 1. void hoverLeaveEvent(QGraphicsSceneHoverEvent *event); 1. void contextMenuEvent(QGraphicsSceneContextMenuEvent *event);...
当moc在hammer.h代码上运行时，它会检查Q_INTERFACES。它为一个名为qt_metacall - void *Hammer::qt...
Adding more items is simply a case of creating the objects, customizing them and then adding them to the scene. In the example below we add an circle, usingQGraphicsEllipseItem-- a circle is just an ellipse with equal height and width. ...
1.一定要将public QObject放在public QGraphicsItem的前面,并且在该类的定义中添加Q_OBJECT宏. 1 classXXGraphicsItem :publicQObject,publicQGraphicsItem 编译时出现警告 Warning: Class Node implements the interface QGraphicsItem but does not list it in Q_INTERFACES. qobject_cast to QGraphicsItem will ...