Ok.In our project we are using a stackedWidget in another stackedWidget.In child stacked page we are using QGraphicsView-Item-Scene so I used
connect(&timeline,SIGNAL(frameChanged(int),,,,SLOT (setFrame()));
but this didn't work.I realized that connect doesn't work.Because the slot doesn't work any.
I made debug and this is so.
SO:
Can we make connects in child widgets or made in parents?
Or:
What is our fault?

Thanks.