John Steele Scott <[EMAIL PROTECTED]> writes:
> I have written a small piece about embedding Guile in wxWidgets GUI program.
> You can read it at:
> <http://www.toojays.net/portal/Wiki/EmbeddingGuileIntoAWxWidgetsProgram>
>
> Does anyone have any comments about it?
Overall it looks like a great tutorial to me. (Although I'm not
familiar with wxWidgets code.)
Some detailed comments...
"if (modifiers == NULL)"
The constant indicating an empty list is SCM_EOL, not NULL, so this
should at least be (modifiers == SCM_EOL). Even better, though, would
be "if (SCM_NULLP (modifiers))".
> In particular, I would appreciate feedback on the way I have wrapped the
> wxWidgets MessageBox() function. I used symbols instead of ORing bits for
> the modifier parameter, so that
> (message-box "Really quit?" "Quit?" 'yes/no 'question)
> is equivalent to
> wxMessageBox("Really quit?", "Quit?", wxYES_NO|wxICON_QUESTION).
IMO this is a nice schemely touch. You could of course compute the
symbols ahead of time, and store them, rather than constructing them
every time message_box is called, but it doesn't matter that much.
> Also, in my MyFrame::OnQuit method, I create a variable in the Guile world,
> and then look it up again after calling the hook. Is this really necessary,
> or can I somehow bind *quit-do-close* directly to a SCM in
> MyFrame::OnQuit's stack frame, which Guile will modify directly, removing
> the need for the call to scm_variable_ref(scm_c_lookup("*quit-do-close*"))?
Well you could do this, which feels a bit more natural (and closer to
what you have requested):
SCM qdcvar = scm_c_lookup("*quit-do-close*");
scm_variable_set_x(qdcvar, SCM_BOOL_T);
scm_c_run_hook(quit_hook, SCM_EOL);
if (SCM_NFALSEP(scm_variable_ref(qdcvar)))
Close(true);
(Alternatively, you could question whether quit-hook really needs to be
a hook, rather than a single function. If it was a single function,
you could call it from C directly and use its return value instead of
the global *quit-do-close*.)
Regards,
Neil
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