Re: [g-a-devel] need help implementing a widget in atk

[David Bolter <dtb gnome org>]

Hi Mike,

For both views I think I would prefer them exposed as a list of 2
ATK_ROLE_TABLE controls and the group names might simply be
accessible-table-caption properties (unless they are user-actionable).
This way you might actually get away with not having to destroy/create
any atk objects when the view is changed.

I'm not familiar with MWF ListView at all, so I might have missed some
obvious gotchas.

cheers,
David

Mike Gorse wrote:
> Hi all,
>
> I am trying to map the MWF ListView control to atk (via UI
> automation). I don't believe there is a gtk control equivalent to it,
> and I want our code to work well with Orca for instance, so I wanted
> to ask if anyone wanted to give input as to what I should do to map
> it.  It has several "views," so a program can dynamically change the
> appearance by changing the View property.  So it is effectively
> equivalent to having several types of widgets to consider.
>
> The Details view is a lot like a GtkTreeView.  I put a screen shot (at
> Will's request) at http://mgorse.freeshell.org/listviewdetail.png.  It
> has a table of books with three columns (title, author, and copyright
> date). The books are divided into "groups" based on the first letter
> of the title, so there are three groups ("C", "M" and "P").  I'm
> thinking that there should be a control with a role of
> ATK_ROLE_TREE_TABLE with the data represented as table cells, but then
> I'm not sure how to represent the group names.  Should they just be
> given rows in the table with the name as the first column and other
> columns on the row being blank?  Also, based on some testing that I've
> done, gail returns -1 when get_row_at_index is called for an object
> that is not at the root level of the tree view.  Is this expected
> behavior that we should emulate (in which case all of the actual data
> would have a row of -1 if groups are used)?
>
> There are other views that display list items in grids
> (http://mgorse.freeshell.org/listviewlargeicon.png), each "group"
> having a separate grid.  UIA exposes a List control which can contain
> multiple Group controls, each of which contain ListItem controls.  The
> Gropu controls implement an interface similar to AtkTable.  It would
> probably be simplest for me to implement a hierarchy such as the
> following in atk, since there would be a one-to-one correspondance
> between UIA and ATK objects:
>
> ATK_ROLE_LIST
>   ATK_ROLE_TABLE
>     ATK_ROLE_TABLE_CELL
>     ...
>   ATK_ROLE_TABLE
>     ATK_ROLE_TABLE_CELL
>     ...
>   ...
>
> Let me know if any of you think that something else makes more sense.
> Role names are easy to change.
>
> Thanks,
> -Mike G-
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