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| Re: Undo in Multiuser Environment [message #1735878 is a reply to message #1735830] |
Thu, 23 June 2016 12:22   |
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Hi, Thorsten,
That is exactly what I would suggest. It is probably not worth the
risk missing something in an analysis of the change-description of
every command on the undo stack to see whether it intersects with an
incoming delta notification. Besides that the API to access those
change descriptions doesn't even exist (and some commands may not have
change descriptions to look at).
In my experience, I don't think I've ever seen an on-line transactional
application that had a meaningful "undo" support (except for local
uncommitted edits in text fields and the like).
Cheers,
Christian
On 2016-06-23 07:16:19 +0000, Thorsten Schlathölter said:
> Hi, I would like to raise the question on how to deal with undo if
> papyrus is used in a multi user environment as it is provided with the
> CDO integration.
>
> I cannot think of any other solution than to clear the undo\redo
> history if delta notifications from other CDOTransactions come in.
>
> Are there any ideas?
>
> Regards,
> Thorsten
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| Re: Undo in Multiuser Environment [message #1735884 is a reply to message #1735878] |
Thu, 23 June 2016 12:42 |
 Ed Willink
Messages: 7655
Registered: July 2009 |
Senior Member |
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Hi
I think it is part of the problem of maintaining the history as a
sequence of semantic primitives. Then you undo by do-ing an inverse
semantic change, not by restoring an earlier context. Successfully
do-ing the inverse semantic change must be heavily predicated by a
consistent starting state; you cannot undo a move to something that has
been refactored in the meantime.
Regards
Ed Willink
On 23/06/2016 13:22, Christian W. Damus wrote:
> Hi, Thorsten,
>
> That is exactly what I would suggest. It is probably not worth the
> risk missing something in an analysis of the change-description of
> every command on the undo stack to see whether it intersects with an
> incoming delta notification. Besides that the API to access those
> change descriptions doesn't even exist (and some commands may not have
> change descriptions to look at).
>
> In my experience, I don't think I've ever seen an on-line
> transactional application that had a meaningful "undo" support (except
> for local uncommitted edits in text fields and the like).
>
> Cheers,
>
> Christian
>
>
> On 2016-06-23 07:16:19 +0000, Thorsten Schlathölter said:
>
>> Hi, I would like to raise the question on how to deal with undo if
>> papyrus is used in a multi user environment as it is provided with
>> the CDO integration.
>>
>> I cannot think of any other solution than to clear the undo\redo
>> history if delta notifications from other CDOTransactions come in.
>>
>> Are there any ideas?
>>
>> Regards,
>> Thorsten
>
>
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