求救：installSceneEventFilter与sceneEventFilter捕获消息的问题！sceneEventFilter断点么有被激活！
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各位大侠：
请教一个问题，我在sceneEventFilter中设置了断点没有被激活
使用方法如下：
class A :public QGraphicsObject
{
A()
{
QLineF line(.....);
QGraphicsLineItem* lineSeg = new QGraphicsLineItem(line);lineSeg->installSceneEventFilter(this);
registerGraphicsItemInScene(lineSeg);}
bool sceneEventFilter(QGraphicsItem * watched, QEvent * event)
{
QMessageBox msgBox;
msgBox.setText(_blockItem->name());
msgBox.exec();
switch(event->type())
{
case QEvent::MouseButtonDblClick:
return true;
case QEvent::MouseButtonPress:
return true;
case QEvent::MouseButtonRelease:
return true;
}return QGraphicsItem::sceneEventFilter(watched, event);
}
}main()
{
A a;
registerGraphicsItemInScene(&a);
........}
然后，在测试的过程中，sceneEventFilter根本没有被调用。请问这是什么情况，怎么样能解决啊？
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class A :public QGraphicsObject
{
A()
{ QLineF line(…..);
QGraphicsLineItem* lineSeg = new QGraphicsLineItem(line);
lineSeg->installSceneEventFilter(this);
registerGraphicsItemInScene(lineSeg);
}
bool sceneEventFilter(QGraphicsItem * watched, QEvent * event)
{
QMessageBox msgBox;
msgBox.setText(_blockItem->name());
msgBox.exec();
switch(event->type())
{
case QEvent::MouseButtonDblClick: return true;
case QEvent::MouseButtonPress: return true;
case QEvent::MouseButtonRelease: return true; }
return QGraphicsItem::sceneEventFilter(watched, event); }
}
main()
{
A a;
registerGraphicsItemInScene(&a);
……..}
