[Kde-bindings] QtRuby File menu vanishing

[Mark Somerville]

On Tuesday 21 June 2005 15:41, Richard Dale wrote:
> On Tuesday 21 June 2005 13:28, Mark Somerville wrote:
> > I have had this problem in a couple of QtRuby applications that I've
> > written and haven't got a clue what is causing it. The menu appears and
> > operates fine when the program is first started. However, after a
> > seemingly random (1-15) GUI events (button presses, widget resizing...),
> > the file menu vanishes, never to be seen again. If there are other menus
> > too, then they sometimes vanish too.
> >
> > Has anyone else had any problems like this? Does anyone know what is
> > causing it?
> >
> > My code is quite straightforward, so I suspect it's a problem somewhere
> > else.
> >
> > filemenu = Qt::PopupMenu.new
> > filemenu.insertItem("&Quit", self, SLOT('quit()'))
> > menu = menuBar()
> > menu.insertItem("&File", filemenu)
> >
> > Any clues?
>
> It looks to me as though menu.insertItem() doesn't make the menuBar the
> parent of the filemenu (I'll check that to make sure). Therefore, it would
> get garbage collected because the mark phase of ruby garbage collection
> would think it's ok to delete the popup menu once the local variable
> 'filemenu' has gone out of the ruby scope. What if filemenu is a global
> variable '$filemenu' or instance variable '@filemenu' does it still happen?
> Could you post a complete small example program that reproduces the
> problem?

That makes perfect sense, but hadn't even crossed my mind (although I'm not 
sure why not)! Making the menu a class variable solves the problem - thanks a 
lot.

Mark

>
> -- Richard
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