[Qt-interest] Find main window from widget

[Cole, Derek]

Thank you..not long after I posted to the group I found a version of this on a forum and was able to adapt it to my situation. The only hitch is, that QGraphicsItem has to subclass QWidget, and that has to be first in the list of items your QGraphicsItem subclasses (I was actually subclassing QGraphicsPixmapItem)

-----Original Message-----
From: yunqiu liu [mailto:yunqiuliu at yahoo.com]
Sent: Sat 1/22/2011 4:21 PM
To: Cole, Derek; qt-interest at qt.nokia.com
Subject: Re: [Qt-interest] Find main window from widget
 
Hi Derek,

you could try,
1, declare a signal function in subclass of QGraphicsItem
   For example, in subclass "sGraphicsItem",
   signals:
   void pos_hoverMoveEvent_signal(int,int);
2, in function sGraphicItem::hoverMoveEvent ( QGraphicsSceneHoverEvent * event )
   get x and y position
   emit pos_hoverMoveEvent_signal(x,y);
3, try to build the connect of signal and slot callback function between two 
objects(graphicsitem and label)

Thanks,
YQ



________________________________
From: "Cole, Derek" <dcole at integrity-apps.com>
To: qt-interest at qt.nokia.com
Sent: Sat, January 22, 2011 9:34:56 AM
Subject: [Qt-interest] Find main window from widget

Find main window from widget 

Hello,

If I have subclass a QGraphicsItem, and I want to send some information from the 
hoverMoveEvent back to a label that is in my main UI, how do I get that? Do I 
just loop over event.widget().parentWidget() until that returns zero, and then I 
can try to do a findChild<QLabel *>(labelName)?

I thought there would be an easy way to find another widget from within one, but 
its not popping out at me anyway.

I basically want a label to update with my pixel coordinates as I mouse over 
this QGraphicsItem 



      

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