<AWT Dev> [9] Review Request: JDK-8032872: [macosx] Cannot select from JComboBox in a JWindow

Anton V. Tarasov anton.tarasov at oracle.com
Mon Mar 3 06:15:15 PST 2014

Hi all,

The fix looks fine for me. The usage of getOwnerFrameDialog() in the mentioned cases indeed seems 
incorrect. I've looked at the rest of the code and found yet another incorrect usage, in 
LWWindowPeer.changeFocusedWindow line 1265. Please, fix it the same way. All the other use cases of 
the method should be fine as they relate to an activation (a simple window can't be an active window).

Also, I'd recommend to add a new testcase to java/awt/Window/Grab/GrabTest.java


On 03.03.2014 16:49, Sergey Bylokhov wrote:
> On 3/3/14 2:22 PM, dmitry markov wrote:
>> If I get it right, getOwnerFrameDialog() is designed for another purpose. Also it is NOT only 
>> used in notifyMouseEvent() and notifyNCMouseDown().
> Probably other places don't work also? I see that these usages are related to the focus staff. 
> Anton do you know why LWWindowPeer.getOwnerFrameDialog() checks Frame and Dialog only?
>> So I think we should stay this method as is to avoid any problems in future.
>> It is really necessary to add new method isOneOfOwnersOf(). BTW this approach is already used on 
>> Windows platform, see awt_Window.cpp for details.
>> Thanks,
>> Dmitry
>> On 03/03/2014 13:54, Petr Pchelko wrote:
>>> Hello, Dmitry.
>>> I've investigated a similar issue a while ago 
>>> (https://bugs.openjdk.java.net/browse/JDK-8029686), could you please check if this issue is also 
>>> resolved by your fix?
>>>> In other words the current implementation assumes that the grabbingWindow must be an instance 
>>>> of Frame or Dialog and does not handle the case when the grabbingWindow is JWindow.
>>> When I was investigating this I did not understand why that was done that way. Do you know the 
>>> reason?
>>> May be it's better not in introduce a new function but replace the getOwnerFrameDialog with your 
>>> new implementation?
>>> Thank you.
>>> With best regards. Petr.
>>> On 03.03.2014, at 13:45, dmitry markov <dmitry.markov at oracle.com> wrote:
>>>> Hi Sergey,
>>>> The current implementation of LWWindowPeer.getOwnerFrameDialog() may return an instance of 
>>>> Frame or Dialog. The returned value used to check whether the grabbingWindow is owner of mouse 
>>>> event target or not.
>>>> If JComboBox is added to JFrame, the grabbingWindow is JFrame and getOwnerFrameDialog() returns 
>>>> the same JFrame object, (i.e. the check passes).
>>>> If JCombobox is added to JWindow which is owned by JFrame, the grabbingWindow is JWindow but 
>>>> getOwnerFrameDialog() returns the JFrame, (i.e. the check fails).
>>>> In other words the current implementation assumes that the grabbingWindow must be an instance 
>>>> of Frame or Dialog and does not handle the case when the grabbingWindow is JWindow.
>>>> Thanks,
>>>> Dmitry
>>>> On 03/03/2014 13:01, Sergey Bylokhov wrote:
>>>>> Hi, Dmitry.
>>>>> Why the problem is reproduced in JWindow? Why it works in JFrame?
>>>>> On 3/3/14 10:40 AM, dmitry markov wrote:
>>>>>> Hello,
>>>>>> Could you review the fix for jdk9, please?
>>>>>> bug: https://bugs.openjdk.java.net/browse/JDK-8032872
>>>>>> webrev: http://cr.openjdk.java.net/~dmarkov/8032872/jdk9/webrev.00/
>>>>>> Problem description: It is impossible to make a selection in JComboBox added to JWindow via 
>>>>>> the mouse. The problem is caused by incorrect mouse events handling in LWWindowPeer class. 
>>>>>> When LWWindowPeer receives a mouse event intended for a popup window, it checks whether the 
>>>>>> current grabbingWindow is owner of the popup using getOwnerFrameDialog() method. This 
>>>>>> approach always fails for the JComboBox added to JWindow. As a result an UngrabEvent is send 
>>>>>> to the popup window.
>>>>>> Fix: Introduce new private method LWWindowPeer.isOneOfOwnersOf(LWWindowPeer peer). The method 
>>>>>> will be invoked on grabbingWindow object to test whether it is owner of current mouse event 
>>>>>> target or not. The usage of getOwnerFrameDialog() should be replaced by isOneOfOwnersOf() in 
>>>>>> LWWindowPeer.notifyMouseEvent() and LWWindowPeer.NotifyNCMouseDown().
>>>>>> Thanks,
>>>>>> Dmitry

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