<AWT Dev> <Swing Dev> Public RequestFocusController/AWTAccessor API

[Semyon Sadetsky]

Hi Reto,

It is unlikely that AWTAccessor API may be opened. It gives access to 
internal undocumented methods not to even mention that those methods 
have private and package accesses.
As I understand you need the way to intercept focus transfer initiated 
by a traversal key. Why to subclass the DefaultKeyboardFocusManager to 
override its focusNextComponent/ focusPreviousComponent methods?

--Semyon

On 4/12/2016 2:37 PM, Reto Merz wrote:
> Hello Alexandr,
>
> Basically we need to detect and intercept focus changes.
>
> java.awt.Component allows to override this methods:
> requestFocus()
> requestFocus(boolean)
> requestFocusInWindow()
> requestFocusInWindow(boolean)
>
> requestFocus() is only invoked when the component is focused by a mouse click.
> But no requestFocus* method is invoked when a FocusTraversalPolicy is involed
> (f. e. the user press TAB to focus next component).
>
> sun.awt.RequestFocusController#acceptRequestFocus is invoked in both cases.
>
> Attached a demo to reproduce it:
> - if TextField is focused by a mouse click "requestFocus" and "acceptRequestFocus" is logged
> - if TextField is focused by TAB only "acceptRequestFocus" is logged
>
> Some more notes about the test program:
> ComponentAccessorDelegator delegates all calls to the original ComponentAccessor implementation.
> Only ComponentAccessor#setRequestFocusController is changed to keep our RequestFocusController implementation.
>
> I have just filled a RFE on http://bugreport.java.com/bugreport
>
> Thanks
> Reto Merz
>
>
> On 11/04/16 21:02, Alexander Scherbatiy wrote:
>>   Hello Reto,
>>
>>   Could you provide use cases which illustrate tasks the requested API is intended to solve in your application?
>>
>>   Please, also create a request in the bug system http://bugreport.java.com/bugreport
>>
>>   Thanks,
>> Alexandr.
>>
>>> On 11/04/16 12:26, Alexander Scherbatiy wrote:
>>>
>>>   Resending the request to awt-dev alias.
>>>
>>>   Thanks,
>>>   Alexandr.
>>>
>>> On 4/4/2016 4:54 PM, Reto Merz wrote:
>>>> Hello,
>>>>
>>>> Jigsaw will disallow access to internal packages.
>>>> We have written a complex validation and focus management
>>>> implementation for our closed-source RIA and maintain it since JRE
>>>> 1.4.
>>>>
>>>> For this we use some internal API. We have a custom implementation of
>>>> these interfaces:
>>>>
>>>> sun.awt.RequestFocusController
>>>> sun.awt.AWTAccessor.ComponentAccessor
>>>>
>>>> And use this getter and setter:
>>>>
>>>> sun.awt.AWTAccessor#setComponentAccessor(AWTAccessor.ComponentAccesso
>>>> r)
>>>> sun.awt.AWTAccessor#getComponentAccessor()
>>>> sun.awt.AWTAccessor.ComponentAccessor#setRequestFocusController(Reque
>>>> stFocusController)
>>>>
>>>>
>>>> Please make this API public.
>>>>
>>>> Furthermore we need to call
>>>> java.awt.Component#revalidateSynchronously().
>>>> We do this with reflection. It would be nice to have a public API for
>>>> this.
>>>> Maybe a new static method on AWTAccessor:
>>>> AWTAccessor.revalidateSynchronously(Component)
>>>>
>>>> Best Regards
>>>> Reto Merz
>>>>

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