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Re: Graphics and JVMs

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  To: comp.lang.java.gui
sshark@gmail.com wrote:
..
>I don't quite get what you commentede,
>
>// Except for Swing root components, use 'paint()'.
>// but then, it is unwise to be rendering
>// to root components.  Better to render to a
>// JPanel and add it to the root component.
>
>I suppose JFrame is the root or the lowest component of all the
>components it contains. If so, why do you override paint(...) instead
>of paintComponents(...) in the sample code above?

OK - this ties in with my advice to 'not paint to root GUI
components' (at all).  

1) As mentioned above, JPanel is much more verstatile.  A 
JPanel might be put in any 'root container' as well as other 
JPanels.  Putting one JPanel in another is probably what 
you would need to do, to get the effect you are after.

2) The 'paint()/paintComponent()' breakdown between Swing and the
AWT is effectively turned on its head by the root components
(so it adds confusion/complexity to the mix).

We might say "For AWT, override paint(), and for Swing, override
paintComponent()" ..except for the irritating fact that with Swing you
might *usually* override paintComponent(), except for those root
components where it is paint(), such as JFrame, JWindow, JDialog, 
JOptionPane.. no ..wait, JOP inherits from JComponent and *has* 
a paintComponent() method - another inconsistency.  A

ll up, I think it is best to advise "with Swing custom painting, 
override paintComponent(Graphics) unless the compiler tells 
you there is 'no such symbol' on the method name, then 
override paint(Graphics)."!

-- 
Andrew Thompson
http://www.athompson.info/andrew/

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Graphics and JVMs "sshark" <sshark@THRWHITE.remove-dii-this> - 2011-04-27 15:40 +0000
  Re: Graphics and JVMs "Andrew Thompson" <andrew.thompson@THRWHITE.remove-dii-this> - 2011-04-27 15:40 +0000
    Re: Graphics and JVMs "sshark" <sshark@THRWHITE.remove-dii-this> - 2011-04-27 15:40 +0000
      Re: Graphics and JVMs "Knute Johnson" <knute.johnson@THRWHITE.remove-dii-this> - 2011-04-27 15:40 +0000
        Re: Graphics and JVMs "sshark" <sshark@THRWHITE.remove-dii-this> - 2011-04-27 15:40 +0000
          Re: Graphics and JVMs "Knute Johnson" <knute.johnson@THRWHITE.remove-dii-this> - 2011-04-27 15:40 +0000
      Re: Graphics and JVMs "Andrew Thompson" <andrew.thompson@THRWHITE.remove-dii-this> - 2011-04-27 15:40 +0000
    Re: Graphics and JVMs "Roedy Green" <roedy.green@THRWHITE.remove-dii-this> - 2011-04-27 15:40 +0000
  Re: Graphics and JVMs "Roedy Green" <roedy.green@THRWHITE.remove-dii-this> - 2011-04-27 15:40 +0000
  Re: Graphics and JVMs "Roedy Green" <roedy.green@THRWHITE.remove-dii-this> - 2011-04-27 15:40 +0000
    Re: Graphics and JVMs "sshark" <sshark@THRWHITE.remove-dii-this> - 2011-04-27 15:40 +0000
      Re: Graphics and JVMs "Roedy Green" <roedy.green@THRWHITE.remove-dii-this> - 2011-04-27 15:40 +0000
        Re: Graphics and JVMs "Andrew Thompson" <andrew.thompson@THRWHITE.remove-dii-this> - 2011-04-27 15:40 +0000
          Re: Graphics and JVMs "Roedy Green" <roedy.green@THRWHITE.remove-dii-this> - 2011-04-27 15:40 +0000
            Re: Graphics and JVMs "Andrew Thompson" <andrew.thompson@THRWHITE.remove-dii-this> - 2011-04-27 15:40 +0000

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