[REVIEW] Restricting the ComboBox selection model to single selection

steve.x.northover at oracle.com steve.x.northover at oracle.com
Fri Feb 3 16:42:22 PST 2012


If not fixed, forever will it haunt us!


On 03/02/2012 7:18 PM, Jonathan Giles wrote:
> Hi all,
> http://javafx-jira.kenai.com/browse/RT-19367
> I'm asking for approval to change the API of the ComboBox 
> selectionModel property, from the more general SelectionModel class, 
> to the more specific SingleSelectionModel class. This enforces the 
> fact that the ComboBox, for now and evermore, will only support single 
> selection (much like the ChoiceBox control). Should multiple selection 
> ever be needed, a separate 'ListBox' control can be developed to more 
> aptly serve these needs.
> The desire to make this change is, however, more due to the fact that 
> the current API does no one any favours. It misleads developers to 
> think that by installing a MultipleSelectionModel into the property, 
> they may be afforded some multiple selection functionality, which is 
> not true. This change makes it impossible for them to think this, as 
> compilation will fail in this case. I would argue that this is a bug 
> in the API, and one that should be fixed prior to being set in stone. 
> Not fixing this bug prior to shipping the ComboBox control will lead 
> to confusion and / or bug reports from developers expecting 
> functionality.
> The proposed patch is attached to the Jira issue. The changes are 
> minimal and, I would argue, as risk free as one can hope. It has no 
> impact on unit tests as there were no multiple selection tests 
> written, and I hope the same can be said for the automated tests.
> Thanks,
> Jonathan

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