Re: implementing guile-gtk drag & drop...

[Marius Vollmer <mvo@zagadka.ping.de>]

Daniel Skarda <0rfelyus@ucw.cz> writes:

> > Using gtk_selection_data_copy/free seems to be the right thing to do.
> > Can you figure out why they made drag and drop fail?  Maybe there are
> > bugs in those functions that we can work around.
> 
>   Unfortunately Gtk creates GtkSelectionData, invokes a handler and
> expects that you gtk_selection_data_set on data that Gtk passed to
> handler, not to its copy :-( See gtkselection.c.

Aha.  So gtk_selection_data_copy is useless and GtkSelectionData
should really be using reference counting, right?

In that case, we need a new kind of life-time management option in
guile-gtk: the Scheme value that represents a GtkSelectionData needs
to be invalidated when the real GtkSelectionData is freed.

We don't have such a mechanism currently, but it should not be that
difficult to add it.  Basically, sgtk_callback_marshal would need to
'destroy' the arguments of the callback when it has returned.

Any takers?

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