<Swing Dev> [10] RFR JDK-8178025:HiDPI with non-integer scale factor - SPANs in HTML are rendered overlapping each other

[Prasanta Sadhukhan]

I would guess so as "ancestor" listener is to support notification when 
changes occur to a JComponent or one of its ancestors.

Regards
Prasanta
On 10/23/2017 7:45 PM, Alan Snyder wrote:
> Does it handle the case where the graphics configuration is later changed?
>
>   Alan
>
>
>> On Oct 22, 2017, at 11:23 PM, Prasanta Sadhukhan 
>> <prasanta.sadhukhan at oracle.com 
>> <mailto:prasanta.sadhukhan at oracle.com>> wrote:
>>
>>
>>
>> On 10/19/2017 3:42 PM, Prasanta Sadhukhan wrote:
>>>
>>>
>>> On 10/19/2017 3:49 AM, Sergey Bylokhov wrote:
>>>> On 17/10/2017 03:48, Prasanta Sadhukhan wrote:
>>>>> It seems for JLabel, Component.updateGraphicsData() with proper 
>>>>> GraphicsConfiguraiton is never called which it does for 
>>>>> JTextComponent or JDialog. Do you know why? Because of this, 
>>>>> correct FRC is not created.
>>>>> I am not sure what else I can do to create correct FRC.
>>>>
>>>> But at some point we will get a correct GraphicsConfiguraiton for a 
>>>> component, right? It should be called for the window and child when 
>>>> we show the window on the screen, when we move the window to 
>>>> another screen, etc.
>>>>
>>>>
>>> Yes, it seems to be called when JLabel is added to JFrame but not 
>>> before.
>>> Span is calculated in GlyphPainter1.getSpan() which is called when 
>>> JLabel is created and
>>> as it seems, not when JLabel is added to JFrame (which is when we 
>>> get the correct graphics configuration and therefore correct transform).
>>>
>>> So, we need to make sure spans are recalculated when the JLabel is 
>>> added to frame, which is what modified webrev does by calling 
>>> JLabel.updateUI()
>>> http://cr.openjdk.java.net/~psadhukhan/8178025/webrev.01/ 
>>> <http://cr.openjdk.java.net/%7Epsadhukhan/8178025/webrev.01/>
>>>
>> Modified webrev to only update html renderer when JLabel is added to 
>> frame by listening to property "ancestor" which implies component is 
>> added/made visible, at which point correct graphics configuration is set.
>> http://cr.openjdk.java.net/~psadhukhan/8178025/webrev.02/ 
>> <http://cr.openjdk.java.net/%7Epsadhukhan/8178025/webrev.02/>
>>
>> Regards
>> Prasanta
>>> Regards
>>> Prasana
>

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