Re: [g-a-devel] ATK for own cell renderer

[Bill Haneman <gnome billhaneman ie>]

Marcin Lyko wrote:
> Hi,
> I've written my own cell renderer which inherits from GtkCellRenderer
> and I use the renderer with GtkTreeView. Now I want to write
> implementation of ATK for the object and I want to do it in my own
> package, but I have a problem because my accessible object cannot
> inherit from GailRendererCell, it is not available outside Gail. As I
> see, all accessible objects for cell renderers should inherit from
> GailRendererCell if these renderers are used with GtkTreeView, if not,
> the implementation of ATK for any renderer is not complete (e.g. size,
> position and focus is not available).
> So, is it possible to create implementation of ATK for my own renderer
> without changing Gail? If it is possible, how to do it?
>   
Hi Marcin;

I believe this is possible - see Marc Mulcahy's paper on writing custom 
widget accessibility support. It's a bit of a hack, but you can inherit 
from a GailObject type without access to the original Gail headers - via 
the GObject/GType system.

http://developer.gnome.org/projects/gap/presentations/GUAD3C/making-apps-accessible/start.html

The GObject system's object constructor for your custom GailRendererCell 
implementation needs to know the size of the object to be allocated - 
this can be obtained from the base GailRendererCell class by asking the 
GType system at runtime.

Have a look at the examples in Marc's paper - if it doesn't make sense, 
you might ask Padraig O'Briain at Sun.

Best regards,

Bill
> Regards,
> Marcin
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