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AWT_SWT JTextPane Problem [message #460793]

Wed, 07 September 2005 08:17

Sandro Orlando

Messages: 1
Registered: July 2009

Junior Member

Hallo

I have a RCP with a JTextPane as Editor. The JTextPane is placed on
JScrollPane. I have two problems:

1. It flickers when I scroll (it flickers A LOT)
2. When I press CTRL+A I get an
"Unhandled event loop exception
Reason:
object is not an instance of declaring class"

Can anyone help me with these problems? Is there an easy way to hunt down
event loop exceptions?

Thanks for any help

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Re: AWT_SWT JTextPane Problem [message #460812 is a reply to message #460793]

Wed, 07 September 2005 21:00

Gordon Hirsch

Messages: 100
Registered: July 2009

Senior Member

On the flicker issue, are you running with a Swing root pane? See the
snippet at:

http://dev.eclipse.org/viewcvs/index.cgi/org.eclipse.swt.sni ppets/src/org/eclipse/swt/snippets/Snippet154.java?rev=HEAD& amp;content-type=text/vnd.viewcvs-markup

Even with the root pane in place, I still see a more flicker on Swing
components than SWT components when resizing my main RCP window. It
seems that the Swing components are forced to handle a lot more resize
events than if the same Swing components are running as a standalone
java app.

If you are on windows, you might also consider setting the property
"sun.awt.noerasebackground" to true... it helps a bit more, but it also
has some side effects you may not like. This property prevents clearing
of the background before repainting it. While reducing flicker, it also
means that you occasionally, briefly see junk inside Swing components
before they have a chance to repaint.

Sandro wrote:
> Hallo
>
> I have a RCP with a JTextPane as Editor. The JTextPane is placed on
> JScrollPane. I have two problems:
>
> 1. It flickers when I scroll (it flickers A LOT)
> 2. When I press CTRL+A I get an
> "Unhandled event loop exception
> Reason:
> object is not an instance of declaring class"
>
> Can anyone help me with these problems? Is there an easy way to hunt down
> event loop exceptions?
>
> Thanks for any help

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