The link between the forum and the mailing list was broken again, so my reply
got lost:
I see that in some cases the window gets hidden/shown when changing
L&Fs (like when switching from Windows to Metal), and in some
it doesn't (Windows <-> Nimbus). The exception is only thrown
in the first case.
This is because the demo disposes and re-creates the frame when
switching to a L&F which can/can't render its decorations (see
test/ribbon/BasicCheckRibbon.java):
[code]
if (canBeDecoratedByLAF == wasDecoratedByOS) {
boolean wasVisible = frame.isVisible();
frame.setVisible(false);
frame.dispose();
if (!canBeDecoratedByLAF) {
// see the java docs under the method
// JFrame.setDefaultLookAndFeelDecorated(boolean
// value) for description of these 2 lines:
frame.setUndecorated(false);
frame.getRootPane().setWindowDecorationStyle(
JRootPane.NONE);
} else {
frame.setUndecorated(true);
frame.getRootPane().setWindowDecorationStyle(
JRootPane.FRAME);
}
frame.setVisible(wasVisible);
wasDecoratedByOS = !frame.isUndecorated();
}
[/code]
Nothing illegal here, so the exception is a bug, please file it.
Thanks,
Dmitri
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