Re: Strange bug while subclassing Gtk2::Box

[Jaap Karssenberg <j g karssenberg student utwente nl>]

muppet wrote  on 10/30/2005 11:06 PM:
... 8< ...
> What versions of gtk+ and Gtk2?

Works on:
archlinux gtk+ 2.8.6 gtk2-perl 1.101 (my default system)

Doesn't work on:
Gentoo gtk+ 2.4.14 gtk2-perl 1.101 (my debug system)
Minislack gtk+ 2.4.0  gtk2-perl 1.082 (James Muir)
Debian, gtk+ 2.6.1 gtk2-perl 1.081 (Eduardo M KALINOWSKI)

+ your results for gtk+ 2.6.10 versus 2.8.2

Compiling this list I think I talked to quick when I said it wasn't a
version difference. As it appears to me the bug shows with gtk versions
< 2.8.x

... 8< ...
> I instrumented your code with some calls to  
> Glib::Object::signal_add_emission_hook() (from Glib 1.10x), ran the  
> code in both sandboxes, and compared the output.  For some reason,  the 
> older gtk+ (which doesn't show the buttons) does not propagate  expose 
> events to the HBox's children, but gtk+ 2.8 does.
>
> Making your MyBox derive from HBox and disabling your do_size_allocate 
> () results in a working example on both versions.  You probably want  to 
> compare your do_size_allocate() with gtk_hbox_size_allocate() and  see 
> what you're doing differently.

Yes, I checked gtkhbox.c already. (I also looked at the gtkpathbar.c 
which is used for the filechooser widget for some hard coded details 
like the size of the slider buttons :S ). The thing is, there is nothing 
there; they just calculate the size that needs to be allocated to each 
button and then call size_allocate() on the buttons. I diff'ed gtkhbox.c 
from version 2.4.14 to 2.8.6 but there are practically no difference. 
Parent classes gtkcontainer and gtkbox show some differences, but mainly 
typos, nothing significant.

I tried calling Gtk2::Container::propagate_expose() on the expose_event 
for my box class but that didn't help. I'll try more of these kind of 
things at random :(

-- Jaap <pardus cpan org>