A whack on the side of the head needed.

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Roedy Green - 07 Mar 2008 02:17 GMT

I converted an app from AWT to Swing. Now it does not work and I am
baffled why. I call repaint on my custom component, but the
paintComponent method never gets called.

What sorts of thing could be going wrong?
--

Roedy Green Canadian Mind Products
The Java Glossary
http://mindprod.com

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Roedy Green - 07 Mar 2008 02:39 GMT

On Fri, 07 Mar 2008 02:17:45 GMT, Roedy Green
<see_website@mindprod.com.invalid> wrote, quoted or indirectly quoted
someone who said :

>I converted an app from AWT to Swing. Now it does not work and I am
>baffled why. I call repaint on my custom component, but the
>paintComponent method never gets called.
>
>What sorts of thing could be going wrong?

Mystery sort of solved. For unknown reasons, at the time I called
repaint, the component thinks its size is 0x0. When this happens the
repaint event gets discarded.
--

Roedy Green Canadian Mind Products
The Java Glossary
http://mindprod.com

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Roedy Green - 07 Mar 2008 07:44 GMT

On Fri, 07 Mar 2008 02:39:50 GMT, Roedy Green
<see_website@mindprod.com.invalid> wrote, quoted or indirectly quoted
someone who said :

>Mystery sort of solved. For unknown reasons, at the time I called
>repaint, the component thinks its size is 0x0. When this happens the
>repaint event gets discarded.

In the process of getting this to work I discovered two gotchas.

I documented them at

http://mindprod.com/jgloss/opaque.html
and
http://mindprod.com/jgloss/jscrollpane.html

--

Roedy Green Canadian Mind Products
The Java Glossary
http://mindprod.com

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A whack on the side of the head needed.

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