<AWT Dev> <AWT dev>[9] Review request for 8154434: Open the request focus methods of the java.awt.Component which accept FocusEvent.Cause

Semyon Sadetsky semyon.sadetsky at oracle.com
Tue Apr 26 07:27:37 UTC 2016

On 4/25/2016 10:33 PM, Phil Race wrote:
> You will need to convince me of the appropriateness of opening these 
> methods.
> It seems to me that are for the focus system, not for applications.
> Why should an application be allowed to say "I would like component X" to
> receive focus and tell it the reason is a mouse event" when in fact it 
> is nothing of the kind.
This is a continuation of the 8080395. I think it would be mostly 
interesting for framework developers not for applications.
In applications one may need to know the reason why focus is requested 
to the component before the focus is set to it.
As I heard from Anton (that was his task initially) opening the cause 
was requested by some client, but, unfortunately, I don't have any 

> I would like to hear from others if they see a valid use case and that 
> there are no
> down-sides to mis-use.
> -phil.
> On 04/19/2016 02:30 AM, Semyon Sadetsky wrote:
>> Hello,
>> Please review fix for JDK9:
>> bug: https://bugs.openjdk.java.net/browse/JDK-8154434
>> webrev: http://cr.openjdk.java.net/~ssadetsky/8154434/webrev.00/
>> To support the new FocusEvent cause concept introduced by JDK-8080395 
>> the next package-private methods of the java.awt.Component class are 
>> opened in the fix:
>> boolean requestFocus(FocusEvent.Cause cause)  -> public void 
>> requestFocus(FocusEvent.Cause cause)
>> boolean requestFocus(boolean temporary, FocusEvent.Cause cause) -> 
>> protected boolean requestFocus(boolean temporary, FocusEvent.Cause cause)
>> boolean requestFocusInWindow(FocusEvent.Cause cause) -> public 
>> boolean requestFocusInWindow(FocusEvent.Cause cause)
>> The methods are changed to be symmetric with the focus request 
>> methods of the same class which do not accept the cause parameter.
>> The method requestFocus(FocusEvent.Cause cause) was changed to return 
>> no value similarly to the requestFocus() because the returning 
>> boolean true cannot guarantee the focus gain.
>> --Semyon

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