Re: clickable images with alpha channel

[Tim Evans <t evans aranz com>]

Ian Leonard wrote:
> Hi,
>
> I am trying to create a map with overlayed images acting as buttons. I 
> managed to achieve this with 1.2 but am now working with gtk2-2.4.0-1.
>
> I use gtk_image_new_from_file () and put the images in a gtk_fixed 
> container. So far so good - the images, which are irregular shapes 
> display correctly, i.e. the background shows through.
>
> Now I need to make them clickable so I put them in an event_box. After 
> this, they are surrounded by a grey box. It looks like the alpha 
> rendering has been messed up.
>
> Is this a bug or am I doing this the wrong way?

This is the expected behaviour.  A GtkEventBox has a real window behind 
it, so it can't be transparent.  If you're using gtk+-2.4 then you could 
try using gtk_event_box_set_visible_window (eventbox, FALSE).

--
Tim Evans
Applied Research Associates NZ
http://www.aranz.com/