2009/7/27 James Lemieux <
jplemieux@...>:
> [...] A couple other considerations for you in
> this space:
>
> 1) TransactionList can buffer things for you, if that somehow helps.
>
> 2) UndoRedoManager can also track changes and undo/redo them, if that's
> somehow useful to you.
All I actually need is to query for changes, like in my example:
tracker.getDeletedFrom(someList)
tracker.getAddedTo(someList);
This is because the application is just a front-end to system deployed
on application server. When user, for example, gets list of cars, then
add two cars and removes three of them and presses "save" I am sending
to server information:
get rid of cars id=[23,45,98] and then add two new cars [car1=....,
car2=....] which is eventually translated into
'delete from Cars where id=....'
'insert into cars (....) values (...)'
So I really do not need to buffer changes; when I want to get rid of
them, I can just download data from server again and reset the
tracker.
Other thing is: I need it only for simple lists, not for the
transformations. I think that it all would get so trivial if such a
"tracker" could be installed only on the lists which are actually a
source of data, not some kind of transformations... but that could
break the EventList interface transparency. On the other hand, if
BasicEventList would have extra methods for trackers... :)
Regards,
Witold Szczerba
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