On Thu, Jun 13, 2013 at 9:54 PM, Kip Warner <k...@thevertigo.com> wrote:
> > What you can do to (try to) prevent that situation is to set the widget to
> > do "height for width" allocation, and override
> > get_preferred_height_for_width() to honor your aspect ratio. In some
> > situations of course the toolkit won't be able to perfectly honor the
> > allocation request, so be sure not to scale out of bounds no matter what.
>
> Right. What I will do is resize to exactly what is passed into my
> do_size_allocate() override since that size should theoretically meet
> the aspect ratio I am maintaining via my
> do_get_preferred_height_for_width() override.
> def do_get_preferred_height_for_width(self, width):
> return (width / self._aspectRatio)
>
> def do_get_request_mode(self):
> return Gtk.SizeRequestMode.HEIGHT_FOR_WIDTH
>
> ...but something very interesting happens immediately after the return
> in do_get_preferred_height_for_width(). I get an assertion fail buried
> deep somewhere in python-gi...
I suspect something weird is happening because you have the wrong
function signature. I can't find any reference to the basic widget
methods on the python gtk documentation website, but the C signature
is:
void gtk_widget_get_preferred_height_for_width
(GtkWidget *widget,
gint width,
gint *minimum_height,
gint *natural_height);
So try:
def do_get_preferred_height_for_width(self, width, minimum_height,
natural_height):
minimum_height = width / self._aspectRatio
natural_height = width / self._aspectRatio
If that doesn't work, try and find out how the python gintrospection
stuff deals with out parameters.
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