<Swing Dev> Review request for 4473075: JTable header rendering problem (after setting preferred size)

[Alexander Scherbatiy]

On 3/3/2015 3:30 PM, Semyon Sadetsky wrote:
> http://cr.openjdk.java.net/~alexsch/semyon-sadetsky/4473075/webrev.02/
>
> null check is not needed because isPreferredSizeSet() is true only if 
> preferred size is not null.
> Others are accepted.
    The point field is used both on the main and EDT thread in the test. 
There should be proper synchronization to the fields access.

    Otherwise  the fix looks good to me.

    Thanks,
    Alexandr.

>
>
> On 3/3/2015 1:09 PM, Alexander Scherbatiy wrote:
>>
>>   The fix looks good to me.
>>
>>   Just few comments:
>>   - Check that getPreferredSize() can't return null if prefferd size 
>> is set
>>   - extra empty lines 442 and 463 are unnecessary
>>   - scpScroll.getHorizontalScrollBar() call (line 69) in the test is 
>> called on the main thread. It should be called on EDT.
>>
>>  Thanks,
>>  Alexandr.
>>
>> On 3/2/2015 4:11 PM, Semyon Sadetsky wrote:
>>> Regression test scenario was added. Please review the fix.
>>>
>>> webrev: 
>>> http://cr.openjdk.java.net/~alexsch/semyon-sadetsky/4473075/webrev.01/
>>>
>>> 2Sergey:
>>> the garbage mentioned comments in the JBS is not reproducible 
>>> anymore. In any case it is another problem than the described in the 
>>> bug header. The fix solves the original issue.
>>>
>>>
>>> On 2/27/2015 4:47 PM, Semyon Sadetsky wrote:
>>>> Hi Sergey,
>>>>
>>>> It really depends on a point of view.
>>>> There is a comment in the ViewportLayout.java that states that it 
>>>> is an expected behaviour:
>>>> /* If the new viewport size would leave empty space to the
>>>>   * right of the view, right justify the view or left justify
>>>>   * the view when the width of the view is smaller than the
>>>>   * container.
>>>>   */
>>>> ==
>>>> Semyon
>>>>
>>>> On 2/27/2015 4:06 PM, Sergey Bylokhov wrote:
>>>>> Hi, Semyon.
>>>>> Can you clarify the comment below from the CR. Is the actual bug 
>>>>> in JTableHeader and not in JScrollPane? Especially consider, that 
>>>>> the behavior changes by different modes of a JScrollPane.
>>>>>
>>>>> "This problem isn't unique to JTableHeader. For example, consider 
>>>>> the test case I've attached, Bug2.java. Run it the same way, 
>>>>> resized so that the label header component shows "..." at the end, 
>>>>> and then scroll.
>>>>>
>>>>> This appears to be a problem with how JScrollPane treats any 
>>>>> header component with a fixed size like this. There are two things 
>>>>> here:
>>>>>
>>>>> First, I don't understand why garbage is allowed to show up. We at 
>>>>> least need to fix this. Second, perhaps JScrollPane needs to do 
>>>>> better to ensure that the header is large enough to match the 
>>>>> scrollable content."
>>>>>
>>>>>
>>>>> Also I think it is possible to write a test for this issue.
>>>>>
>>>>> -----semyon.sadetsky at oracle.com  wrote:
>>>>>
>>>>>> Hello,
>>>>>>
>>>>>> please review a fix for JDK 9.
>>>>>>
>>>>>> Bug:https://bugs.openjdk.java.net/browse/JDK-4473075
>>>>>> Webrev:
>>>>>> http://cr.openjdk.java.net/~alexsch/semyon-sadetsky/4473075/webrev.00/ 
>>>>>>
>>>>>>
>>>>>> The thing is the general logic of the viewport layout requires the
>>>>>> right
>>>>>> component size which is requested by the getPreferredSize call to 
>>>>>> the
>>>>>>
>>>>>> child component.
>>>>>> The right width of JTableHeader should be calculated in its UI 
>>>>>> but if
>>>>>>
>>>>>> user sets the preferred size manually it makes the calculated size
>>>>>> invisible outside the component. User may need to set preferred size
>>>>>> in
>>>>>> order to adjust header height but in setPreferredSize(Dimension) the
>>>>>> header width is adjusted as well.
>>>>>> The fix solution overrides JComponent::getPreferredSize in
>>>>>> JTableHeader
>>>>>> with the logic returning the right width while preserving the height
>>>>>> adjustable for user.
>>>>
>>>
>>
>