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From "Alex Harui (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLEX-33934) Holding Shift+TAB pressed in DataGrid makes focus jump to textField outside grid, then back to grid editors, and so on
Date Tue, 09 Dec 2014 16:48:13 GMT

    [ https://issues.apache.org/jira/browse/FLEX-33934?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14239641#comment-14239641

Alex Harui commented on FLEX-33934:

This is probably another side-effect of FLEX-33537.  It might be time to revert that change
and see if there is another solution.

> Holding Shift+TAB pressed in DataGrid makes focus jump to textField outside grid, then
back to grid editors, and so on
> ----------------------------------------------------------------------------------------------------------------------
>                 Key: FLEX-33934
>                 URL: https://issues.apache.org/jira/browse/FLEX-33934
>             Project: Apache Flex
>          Issue Type: Bug
>          Components: Focus Manager, Spark: DataGrid
>    Affects Versions: Apache Flex 4.11.0
>         Environment: Windows 8, Adobe AIR 3.9
>            Reporter: Mihai Chira
>            Assignee: Alex Harui
>         Attachments: _DataGridFocus.fxp
> Steps to reproduce:
> 1. Import and run the attached project.
> 2. Double click on Brazil to enter edit mode
> 3. Press and hold Shift+TAB to tab backward through components
> Actual behaviour: focus jumps back and forth between the grid's item editors and the
text field outside the grid.
> Desired behaviour: focus jumps backward only through the editors, not involving the text
field outside the grid.
> Note: this happens without problems when Shift+TAB is pressed with lower frequency.
> Note: in our application we have the same problem with the forward focus (Shift not pressed),
which I could not reproduce in this simple app. And since we're creating many grids whose
cells should be editable similarly to Microsoft Excel's, the priority for us is high.
> Hints:
> 1. From my understanding, DataGridEditor.editor_keyFocusChangeHandler() and FocusManager.keyFocusChangeHandler()
respond to the same event (FocusEvent.KEY_FOCUS_CHANGE), but listen to different objects for
it. When things work correctly, DataGridEditor reponds to the event once the user presses
(Shift+)TAB in a grid's item editor, and (does the necessary work to create and focus the
next editor and then) calls preventDefault() on the event, which tells the FocusManager not
to apply its default behaviour. All works fine.
> 2. However, when (Shift+)TAB is held pressed, or pressed very quickly, what seems to
happen at times is that DataGridEditor.editor_keyFocusChangeHandler() is never called. From
what I can tell from tracing the event instance in FocusManager, that's because the event's
target is no longer the textDisplay inside the item editor, but the strange "_DataGridFocus0.WindowedApplicationSkin2.Group3.contentGroup.__DataGridFocus_DataGrid1.UIComponent37"
instance. This means that DataGridEditor cannot respond to this event, since it's not thrown
by the editor it's listening to.
> 3. I also put traces where the editor is removed and where it's created in DataGridEditor,
which showed that when the unusual event is thrown (see hint #2) the item editor is still
not null, is still on stage, and still has the event listener for FocusEvent.KEY_FOCUS_CHANGE.
So it's not that the editor has been destroyed - it's just that the event is thrown by another
> * using selectedIndex instead of selectedItem works without error.

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