[Qt-interest] Help on QAction

[phil prentice]

Hi Kavindra
  Thankyou very much.  I will certainly look at the link.

Cheers
Phil

On Tuesday 10 March 2009 16:32, Kavindra Palaraja wrote:
> phil prentice wrote:
> > Hi all
> >   I need to create a variable length context menu.  I have used code like
> > this to do it:-
> >
> >   for(int i = 0; i < count; i++)
> >   {
> >     action = instrumentMenu.addAction(array[i]);
> >    /* connect(action, SIGNAL(triggered()), this, SLOT(instMenu())); */
> >   }
> >   CurInstLabel->setContextMenuPolicy(Qt::CustomContextMenu);
> >   connect(CurInstLabel, SIGNAL(customContextMenuRequested(const QPoint
> > &)), this, SLOT(showInstContextMenu(const QPoint &)));
> >
> >   My showInstContextMenu() slot looks like this.
> >
> >   void QTdcwb::showInstContextMenu(const QPoint &)
> >   {
> >     QAction *retAction= instrumentMenu.exec(QCursor::pos());
> >   }
> >
> >   I know which menu option has been selected by the retAction pointer
> > returned from the exec.  Each menu choice has some other data associated
> > with that choice.  I could use retAction to identify which item was
> > selected and then access the appropriate data.  Is there a better way?  I
> > cant use the triggered signal because it wont tell me which menu item was
> > selected (without setting a slot up per action).
> >
> > I just need a means of accessing the data associated with a menu choice
> > (action), without having to do a search through the action list.
> >
> > Thanks
> > Phil
> >
> >
> >
> >
> > _______________________________________________
> > Qt-interest mailing list
> > Qt-interest at trolltech.com
> > http://lists.trolltech.com/mailman/listinfo/qt-interest
>
> Hi Phil,
>
> If you are trying to have different actions but using the same signal,
> you might be able to use QSignalMapper. Normally when you have different
> buttons but all emit the "clicked()" signal, we recommend this class.
>
> You can find out more about it here:
> http://doc.trolltech.com/4.5/qsignalmapper.html
>
> There's a nice explanation on how it works here:
> http://doc.trolltech.com/4.5/signalsandslots.html#advanced-signals-and-slot
>s-usage
>
> Hope this helps,
> Kavindra.
>
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