Am Sonntag, den 11.11.2007, 12:21 +0100 schrieb Mattias Gaertner:
> On Sun, 11 Nov 2007 09:16:04 +0100
> Marc Santhoff <[EMAIL PROTECTED]> wrote:
>
> >[...]
> > Only out of curiosity:
> >
> > Wouldn't a X Windows window ID do? I think that's the equivalent to
> > WinAPIs handles.
> >
> > GDK_WINDOW_XWINDOW (GTK_WIDGET (my_window)->window);
> >
> > is the function/macro to use then.
> >[...]
> > > Maybe my statement was not clear: The Parent/Child connection is the
> > > main problem. It would be easier to handle the child/parent
> > > relationship by the LCL and keep the 1:1 mapping between controls
> > > and handles.
> >
> > But GTK does have the functions
> >
> > gtk_widget_get_toplevel()
> > gtk_widget_get_ancestor()
> > gtk_widget_get_parent()
> >
> > So the GTK-binding could use them?
>
> Again in other words:
> Of course reparenting is possible under all platforms. The LCL use it
> everywhere. The problem is that it works different under all
> platforms, so you need a wrapper: The LCL is a TWinControl
> wrapper to make reparenting possible platform independently.
> Reparenting by Handle is the opposite way.
> It's easy to do on one platform (e.g. Delphi on win32), but it's very
> complex to do it on all platforms. Especially the whole LCL code must
> be checked. So it will be a lot of work. And who will maintain it? It
> seems only very few people will use this feature, so it will hardly be
> tested and probably it will break by the next patch.
>
> Conclusion:
> It is technically doable, but it will need a lot of work and will
> hardly be maintained.
>
> That's why I propose a TForeignHandleControl. That will be easier. It
> can be implemented as package and can start first on the windows
> platform. And when it works on all platforms it can be added to
> the LCL. See for example the trayicon, openglcontrol and
> printers4lazarus packages.
I think I begin to understand now. I misundestood the matter to be a
lack of capability in GTK.
Marc
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