Re: Attempt for an UNO Undo API

On 10/22/2010 09:01 PM, Frank Schönheit wrote:

> As a sketch for the later evolution, we think that the
> XUndoManagerSupplier comes handy here: The chart model would be such a
> supplier, and for the moment, it would return an own, model-local
> instance of the XUndoManager. The later extension would be to let it
> provide the XUndoManager of the embedding document.
>
> In theory, this should be completely transparent to the client, which
> would simply add its actions to another instance, without actually
> noticing it.
>
> In practice, the concrete XUndoAction implementations of course might
> need to be adjusted (what if you do changes to the chart, then delete
> the chart, then do Undo multiple times? The chart Undo actions might
> have a reference to an outdated chart model then.). Also, you would not
> want to provide, in the menu/toolbox, Undo actions of the embedding
> document while the Chart is activated.

I'm still worried about the problem I foresee, but we can postpone that 
until things get more concrete.

> Regardless of this, we agreed that in this first step, we will migrate
> Chart's XUndoManager to the new one, laying a common ground in all
> applications this way, which will also be prepared for the
> above-mentioned changes.
>
> Ciao
> Frank
>
> PS: If only a Writer developer could lend me a hand for implementing the
> new ::svl::IUndoManager interface on top of Writer's own home-grown Undo
> implementation, the whole thing would be nearly finished :)
Sure. :-)
As promised, we will do our very best.

Regards,
Mathias

-- 
Mathias Bauer (mba) - Project Lead OpenOffice.org Writer
OpenOffice.org Engineering at Oracle: http://blogs.sun.com/GullFOSS
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