[jira] [Resolved] (WICKET-5743) Facilitate the way to react upon model changes

["Martin Grigorov (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/WICKET-5743?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Martin Grigorov resolved WICKET-5743.
-------------------------------------
    Resolution: Duplicate

> Facilitate the way to react upon model changes
> ----------------------------------------------
>
>                 Key: WICKET-5743
>                 URL: https://issues.apache.org/jira/browse/WICKET-5743
>             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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