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Re: Strange GUI problem..

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  To: comp.lang.java.gui,comp.l
Daniel Pitts wrote:
> Its hard to distill into an SSCCE, so I'll describe the problem as
> well as I can...
> 
> I have a (rather complex) view, layed out with GridBagLayout.  It
> contains a JPanel in the very middle, which has a slightly transparent
> background.
> 
> I have 4 visible JFrames which have this layout.
> 
> This middle panel starts out with a JButton in it. when the JButton is
> pressed, all the middle panels remove their button, and replace it
> with a JLabel.
> 
> When this happens, the JPanel appears to be partially redrawn with a
> shared double-buffer which isn't cleared properly.
> 
> In other words, I'm seeing parts of my complex layout appear within
> the middle panel, partially drawn over, and definitely not where they
> belong.  Any suggestions?
> 
> My current work around is that when the JPanel removes its button, it
> called revalidate (which IS appropriate and correct), but then it
> calls getTopLevelAncestor().repaint();
> 
> Is there a better solution?
> 

JComponent has an 'opaque' property which it uses to decide whether to 
repaint the ancestors, make sure it is set to false.

-- 
Judy Szikora, Apprisant Technologies Inc.
http://www.apprisant.com

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Strange GUI problem... "Daniel Pitts" <daniel.pitts@THRWHITE.remove-dii-this> - 2011-04-27 15:33 +0000
  Re: Strange GUI problem.. "Knute Johnson" <knute.johnson@THRWHITE.remove-dii-this> - 2011-04-27 15:33 +0000
    Re: Strange GUI problem.. "Daniel Pitts" <daniel.pitts@THRWHITE.remove-dii-this> - 2011-04-27 15:33 +0000
      Re: Strange GUI problem.. "Knute Johnson" <knute.johnson@THRWHITE.remove-dii-this> - 2011-04-27 15:33 +0000
  Re: Strange GUI problem.. "Judy Szikora" <judy.szikora@THRWHITE.remove-dii-this> - 2011-04-27 15:33 +0000
    Re: Strange GUI problem.. "Daniel Pitts" <daniel.pitts@THRWHITE.remove-dii-this> - 2011-04-27 15:33 +0000
      Re: Strange GUI problem.. "Daniel Pitts" <daniel.pitts@THRWHITE.remove-dii-this> - 2011-04-27 15:33 +0000

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