<AWT Dev>  Review request for 8155197: Focus transition issue
dmitry.markov at oracle.com
Wed Oct 4 10:25:58 UTC 2017
Actually we check restoreFocusTo before its usage, (i.e. we compare restoreFocusTo with most resent focus owner for the window; most recent focus owner is visible and focusable, otherwise it is removed from recent focus owners map).
So the checks before assignment are not really necessary. I updated the fix (reverted it to the previous version). Please find webrev here: http://cr.openjdk.java.net/~dmarkov/8155197/webrev.03/ <http://cr.openjdk.java.net/~dmarkov/8155197/webrev.03/>
> On 3 Oct 2017, at 18:30, Sergey Bylokhov <sergey.bylokhov at oracle.com> wrote:
> Hi, Dmitry.
> If this check is valid then probably the same check should be added to restoreFocus()? before:
> #173 restoreFocusTo = toFocus;
> But as it was mentioned before, the component can become non-visible/non-focusable at any point, for example after this check but before the assignment. And instead of data validation before assignment we should check them before use. As far as I understand we already do this, all usages of restoreFocusTo are a checks == or != to some other component which is visible and focusable, isn't it?
> On 10/3/17 08:23, Dmitry Markov wrote:
>> Hi Semyon,
>> I have updated the fix based on your suggestion. The new version is located at http://cr.openjdk.java.net/~dmarkov/8155197/webrev.02/ <http://cr.openjdk.java.net/~dmarkov/8155197/webrev.02/>
>> Also I slightly modified the test to simplify it.
>>> On 2 Oct 2017, at 18:32, Semyon Sadetsky <semyon.sadetsky at oracle.com <mailto:semyon.sadetsky at oracle.com> <mailto:semyon.sadetsky at oracle.com <mailto:semyon.sadetsky at oracle.com>>> wrote:
>>> Hi Dmitry,
>>>>> Actually the parent frame doesn't own the input focus when the issue happens. The focus is on the dialog already and when FOCUS_GAINED event comes for the dialog the KFM discovers that the dialog should not have the focus and rejects it in line 588 of the DefaultKeyboardFocusManager:
>>>>> restoreFocus(fe, newFocusedWindow);
>>>>> This happens when the dialog became non-focusable (non-visible) after the focus request is sent, but before the corresponding FOCUS_GAINED event is handled on the EDT. In this case the focus is directly restored to the previously focused window which doesn't have the focus at this moment and input focus cannot be requested to one of its components synchronously.
>>>>> Please confirm whether you agree on the root cause of the bug.
>>>> You are right. I agree with your evaluation.
>>> Before setting the restoreFocusTo to toFocus in line 190 I would recheck for toFocus.isShowing() && toFocus.canBeFocusOwner() once again because the component can be made non-focusable concurrently.
> Best regards, Sergey.
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