Artem Ananiev artem.ananiev at oracle.com
Mon Dec 24 07:19:58 PST 2012

On 12/24/2012 7:17 PM, Artem Ananiev wrote:
> On 12/21/2012 6:54 PM, Scott Palmer wrote:
>> The underlying JFXPanels are an implementation detail of how the
>> Window is rendered… having per-panel modality built-in seems very
>> strange.  It's like asking should I block other JButtons on my Swing
>> panel after hitting the JButton that brings up my JOptionPane.  It
>> doesn't make sense, the JOptionPane blocks the entire parent Window,
>> no just some small part of it.
>> The Modality of the dialog is what matters, and as I understand it,
>> that relates only to the parent Window and other top-level Windows in
>> the application - embedded "windows" don't count because they aren't
>> something the user is even supposed to be aware of.
>> Anyway.. the blocking can be dealt with in the application code if
>> need be (make the Dialog modeless and block the panel via other
>> means).  It isn't even the issue.  It is the Window hierarchy that is
>> the issue.  Dialogs should never go behind their parent window.
>> That's the only bug I would be trying to address for now.
> FX inside JFXPanel, which is in turn inside a Swing application is the
> same model as Java Plugin running in the browser. I don't think we (in
> AWT, Glass) use browser's window as the owner of dialogs shown from Java
> application, nevertheless we don't have z-order issues (but used to have
> in the past).
> Another example is AWT modal dialogs. As you know, in AWT a dialog can
> block several other windows, not just it's owner. All of the blocked
> windows should be below the blocker dialog, and it cannot be solved by
> using native means (there may be no more than 1 owner for a window). On
> OS X, it's implemented by bringing the dialog to top every time any of
> its blocked windows is activated. It's not perfect, but it works. It
> would not work very well for temporary (popup) windows, but they are
> handled differently, just closed on deactivation.
> Right now FX doesn't provide any API to listen for window z-order and
> activation changes. Such API would help in some cases, what do you think?

AWT does have these notifications, so we can try to use them in FX and 
check how well modal dialogs behave.



> Thanks,
> Artem
>> Scott
>> On 2012-12-21, at 8:09 AM, Anthony Petrov <anthony.petrov at oracle.com>
>> wrote:
>>> It isn't obvious to me, however. Suppose I add several JFXPanels into
>>> a single Swing top-level window. I may want to show a modal dialog
>>> for the first JFXPanel, but leave others operable, for example. This
>>> use case seems to be quite valid.
>>> --
>>> best regards,
>>> Anthony
>>> On 12/21/2012 16:09, Scott Palmer wrote:
>>>> The whole Swing window must be blocked, if possible.  I don't even
>>>> understand why this is a question.  If I show a JOptionPane and I
>>>> give a JPanel as the "parent" component, does it block only the
>>>> JPanel?  This is no different.  Can you give me an example of when
>>>> you would only want the JFXPanel blocked?
>>>> Scott
>>>> On 2012-12-21, at 4:52 AM, Anthony Petrov
>>>> <anthony.petrov at oracle.com> wrote:
>>>>> Hi Scott,
>>>>> I think that technically this could be implemented.
>>>>> However, there's a problem: when you create a modal FX dialog
>>>>> specifying a JFXPanel instance as its owner - should the whole
>>>>> Swing window be blocked while the dialog is showing, or should the
>>>>> JFXPanel be disabled only? Why?
>>>>>  From logical perspective there's not a perfect answer to the above
>>>>> question. No matter what decision we make, some people could get
>>>>> upset.
>>>>> --
>>>>> best regards,
>>>>> Anthony
>>>>> On 12/21/2012 7:00, Scott Palmer wrote:
>>>>>> On 2012-12-17, at 5:55 AM, Artem Ananiev
>>>>>> <artem.ananiev at oracle.com> wrote:
>>>>>>> On 12/14/2012 8:19 PM, Werner Lehmann wrote:
>>>>>>>> Scott,
>>>>>>>> JFXPanel has quite a few issues (look for JFXPanel or Swing in
>>>>>>>> Jira).
>>>>>>>> Among those is the filechooser problem. It is probably just one
>>>>>>>> instance
>>>>>>>> of the problem that a JavaFX stage cannot be modal or on top of
>>>>>>>> Swing
>>>>>>>> windows.
>>>>>>> Yes, z-order and modality problems with Swing and FX top-level
>>>>>>> windows is a known issue. Unfortunately, I don't know a good way
>>>>>>> to fix it: AWT/Swing doesn't expose enough information to use its
>>>>>>> windows as owner windows for other UI toolkits.
>>>>>>> Thanks,
>>>>>>> Artem
>>>>>> I responded earlier wondering why the native window handle of the
>>>>>> Swing Window wasn't acquired via the publicly available jawt
>>>>>> native methods so it could be used as the parent for a Stage or
>>>>>> worked into some sort of hierarchy to give a proper parent window
>>>>>> to FX Stages and dialogs.   I didn't see any response.  Am I
>>>>>> missing something?
>>>>>> I already do this (get and use the native window handle) in a
>>>>>> Swing app so that I can blit live video into my Swing app., a
>>>>>> high-end video capture/transcoder/broadcast application. (See
>>>>>> http://www.digitalrapids.com/en/Products/StreamZHD.aspx or the one
>>>>>> that really could have used FX if it was ready earlier
>>>>>> http://www.digitalrapids.com/en/Products/TouchStream.aspx)
>>>>>> I actually have a need to do the same with a JavaFX app .. but
>>>>>> there is no equivalent in FX land for the jawt JNI methods. (I
>>>>>> asked for this years ago in the Java FX 1.0 days.)
>>>>>> Is all of the code involved in JFXPanel->Scene->Window Open
>>>>>> Source?  I went poking around but didn't find the implementation
>>>>>> of com.sun.javafx.tk.quantum.QuantumToolkit which I think is used
>>>>>> to create the peer of the EmbeddedWindow used as the Window for
>>>>>> JFXPanels.
>>>>>> Cheers,
>>>>>> Scott

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