Proposed libgnomeui changes required for accessibility

[Marc Mulcahy <marc mulcahy sun com>]

> I have reviewed libgnomeui to determine what changes, if any, will be 
> required in order for GNOME 2.0's accessibility framework to be 
> implemented on its widgets.  The following two widgets appear to require 
> changes:

> * GnomeAbout
>         Accessible Interfaces Supported: Acccessible, AccessibleText
>         Comments: the text displayed in the dialog is
>                 drawn directly to the GdkWindow.  There is no way to
>                 map screen or window coordinates to offsets in the
>                 displayed text.  This affects the
>                 getOffsetFromPoint and getCharacterExtents functions of 
> the AccessibleText interface.
>         proposal: provide access to the PangoLayouts used to draw text to 
> the           GdkWindow?
>
>
> * GnomeIconList:
>         Interfaces supported: Accessible, AccessibleSelection
>         Comments: A substantial amount of work.  Needs
>                 accessible flyweight implementation for icons as
>                 well which would implement AccessibleImage.
>         Proposal:
>                 1. Add API accesser function for an icon's text
>                         (preferrably returned as a
>                         GnomeCanvasRichText, but alternatively, as a
>                         gchar *).
>                 2. Add an API accesser function to access an icon's image 
> data.  Could return either a GdkPixbuf or a GnomeCanvasPixbuf.
>                 3. Add keyboard navigation to select and move between
>                         icons.  This implies the notion of an icon in
>                         the list receiving keyboard focus.
The other widgets in the library appear to have adequate coverage based on 
the current accessibility support for GTK+.

Marc