Re: Enhancing GTK+ TreeView accessibility

[Li Yuan <Li Yuan Sun COM>]

Hi Bill,

Thanks for the suggestion. Comments below.

于 2010/6/6 0:52, Bill Cox 写道:
> Hi, Luke.  The speed in gconf-editor is a big problem, but not
> technically a bug.
We have a bug for gailtreeview's performance: 
https://bugzilla.gnome.org/show_bug.cgi?id=577098, and we have done some 
analysis work there.
> However, if you tab over to the Name/Value table,
> you can hear the namee, but the value always says "blank", regardless
> of the value type.  The values themselves are not accessible.  This is
> because the cell renderer is using the get_size callback to set the
> values on the cell just prior to rendering.  The gail module reads
> data from the treeview model for Orca, and if it's missing, all it can
> say is "blank".  I think we need to instead cache the data when the
> cell renderers are called.
>    
I haven't read the code of gconf-editor, is it text cell or some custom 
cell renderer? If it is a custom cell renderer, gconf-editor should 
implement the accessibility peer. Caching the data is what GAIL does for 
known cell renderers.
> This might have two benefits.  First, many applications, like
> gconf-editor, would suddenly become acccessible.  This is perhaps the
> most common reason GTK+ apps are not accessible.  Second, we might
> avoid the huge delays that occur today when we tab to a huge treeview.
>   By only updating the data as it's rendered, we should see no
> noticeable slow down.  However, that slow down may be due to some
> unrelated code.  We'd have to dive in and see.
>    
Please see the above bug.

Regards,
Li