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Laird Nelson  Laird Nelson is happiest immersed in server-side frameworks and middleware, where he has spent the better part of nine years obsessed with software reuse. He has worked for both the Davids and Goliaths of the Boston area as engineer, architect, reuse evangelist, contractor and consultant. He also plays a mean Hammond B3. Laird Nelson's blogNimbus and OpacityPosted by ljnelson on July 31, 2008 at 10:25 AM PDT
This one tripped me up, and I thought I'd post it here. I have a case where I need to pour text into a JTextField, but have that JTextField look like a JLabel. So as I type in one field, I need this "gray" second field to update, live, before the user's eyes. I also need the ability for the user to cut-and-paste values out of it. This sort of thing is reasonably common in properties panels and the like. Now, normally all you have to do is something like this: ...and you have what looks like a JLabel but what behaves like a JTextField.final JTextComponent previewComponent = new JTextField(); previewComponent.setBorder(null); previewComponent.setEditable(false); previewComponent.setOpaque(false); Well, except under Nimbus, where the setOpaque(false) seems to have no effect. Turns out you need to also set the background color to a transparent color as well. Fortunately, this combination of behaviors seems to work under all the other look and feels (looks and feels?): previewComponent.setBorder(null); previewComponent.setEditable(false); previewComponent.setOpaque(false); previewComponent.setBackground(new Color(0, 0, 0, 0)); I hope this helps other Swing folks out. »
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Submitted by ljnelson on Fri, 2008-08-01 08:26.
Thanks, Karl; good to know.
Submitted by kschaefe on Fri, 2008-08-01 07:33.
It is a feature.
The overloaded and poorly understood "opaque" property was never meant to be the "no background" property. The behavior is correct; however, since the previous incorrect behavior existed for so long, some might argue that is still not the right thing.
Karl
Submitted by pcox on Fri, 2008-08-01 07:26.
Thanks for the clarification, it explains why things looked a little haywire under Nimbus when compared to Metal or Windows.
It sounds like it involves a bit more work than simply dropping a new jar in and changing the loaded L&F. That's progress! :)
Thanks, Pete.
Submitted by ljnelson on Fri, 2008-08-01 06:08.
I'm not sure whether it's a bug or a feature, but Jasper Potts had this to say (from http://forums.java.net/jive/thread.jspa?messageID=267839):
"To solve the case of when you want to make a component transparent we added a fix in 6u10 b26 or b27 so if you set the background color to a color with a alpha value of 0."
That tells me *he* thinks it's a feature.
The reason I put this blog entry together was because the sequence of calls I detail works under all look and feels (well, the Sun-supplied ones anyhow).
Cheers,
Laird
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