Opaque « JPanel « Java Swing Q&A





1. JPanel said to be opaque what does that mean?    stackoverflow.com

In Swing JPanel said to be opaque, what does that mean? Also how JPanel VS JComponent compared in relation to opaque? Please explain if possible in simple terms, hence i am not very ...

2. UIManager.put("Panel.opaque", false); does not work    stackoverflow.com

Setting UIManager.put("Panel.opaque", false); does not work. I need to call panel.setOpaque(false); for each panel. what can be the problem?

3. Is there a way to only mark a specific JPanel region as opaque?    stackoverflow.com

Basically I'm drawing a lot of transparent JPanels; profiling shows that most time is spent in Component.paint(). It would be possible to optimize this quite radically since in most cases the ...

4. JPanel not always opaque by default ...    coderanch.com

Hi all, when running some tests on my linux box (RHEL) the last couple of days I had trouble setting background colors of a simple JPanel. The colors did show up correctly running the crossplatform look on feel (javax.swing.plaf.metal.MetalLookAndFeel). The colors did NOT show up correctly running the system look and feel (com.sun.java.swing.plaf.gtk.GTKLookAndFeel). After some troubleshooting I finally did a simple ...