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From "Chris Bartlett (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (PIVOT-677) Add ability to navigate a ButtonGroup of RadioButtons using the keyboard
Date Thu, 30 Jun 2011 14:21:28 GMT

    [ https://issues.apache.org/jira/browse/PIVOT-677?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13057840#comment-13057840

Chris Bartlett commented on PIVOT-677:

I'd like to clarify too. The keyboard 'navigation' as I have referred to it will both select
*and* focus a button, not *just* transfer focus while awaiting selection via a mouse click
or SPACE key press.  Focus can still be transferred with the TAB or SHIFT+TAB keys as usual
(when the 'intraGroupFocusTransferEnabled' property is set).  

This solution delegates to Component#transferFocus(FocusTraversalDirection) when the 'intraGroupFocusTransferEnabled'
property is false.  It is used to determine how focus should be transferred away from the
group, treating the group as a single entity for focusability via the TAB/SHIFT+TAB key presses.

Maintaining a single List of Buttons is not much of a chore, and serves to keep all the logic
in one place.  I did consider changing ButtonGroup's internal collection to a List (enforcing
uniqueness) from a Group so that RadioButtonGroup could reuse it too.  However the few LOC
that might be saved didn't seem to warrant it, and it didn't smell right!

The 'Container 1' to 'Container 6' scenario (from the previously mentioned demo app) uses
a RadioButtonGroup to allow RadioButtons to behave as a group (with keyboard navigation) even
each buttons is in a different container.  I can't see how Component#transferFocus would help
in this case, but I don't think you were considering such a scenario.

> Add ability to navigate a ButtonGroup of RadioButtons using the keyboard
> ------------------------------------------------------------------------
>                 Key: PIVOT-677
>                 URL: https://issues.apache.org/jira/browse/PIVOT-677
>             Project: Pivot
>          Issue Type: Improvement
>          Components: wtk
>         Environment: n/a
>            Reporter: Chris Bartlett
>            Assignee: Chris Bartlett
>            Priority: Minor
>             Fix For: 2.1
> LEFT or UP arrows would select the previous enabled button in the group.
> RIGHT or DOWN arrows would select the next enabled button in the group.
> Optionally, HOME & END would select the first or last enabled button in respectively.
> This functionality could be added to the existing org.apache.pivot.wtk.ButtonGroup class,
or a new class named RadioButtonGroup could be created.
> The ButtonGroup would track the order that the buttons were added and use it to select
the appropriate button.

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