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https://issues.apache.org/jira/browse/WICKET-5742?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14193325#comment-14193325
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Tom Götz commented on WICKET-5742:
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Sorry for double creating the ticket.
> Facilitate the way to react upon model changes
> ----------------------------------------------
>
> Key: WICKET-5742
> URL: https://issues.apache.org/jira/browse/WICKET-5742
> Project: Wicket
> Issue Type: Improvement
> Components: wicket
> Affects Versions: 6.17.0
> Reporter: Tom Götz
> Priority: Minor
>
> As already explained on the mailing list
> (http://markmail.org/thread/dpdejoiwzyiynfvq):
> I need a way to react upon model (object) changes to establish some
> "changelog" functionality. This is currently not possible in a consistent
> way, as e.g. CheckGroup updates the collection in-place before calling
> setObject (please see my posting for more in-depth explanation).
> Therefore I'd propose to establish a listener concept, where listeners are
> called in Component#modelChanging (handing the component to the listener) and
> Component#modelChanged. Currently this is only possible by subclassing
> everything, which is not very practical.
> I could find some time to implement this in the next couple of days I guess,
> if there is consense that this feature may be useful.
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