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Using SWT, I set the shell transparency with setAlpha(x). But then all widgets have become transparent too. Even adding a “all white” image as a composite background became transparent.
So I can’t actually do anything on this window.
Does anyone have a clever idea how to bypass this?
I think this is a standard behavior for window shells on Windows OS. But you can achieve what you want by setting regions on the Shell…
Have a look at this snippet: http://www.java2s.com/Code/Java/SWT-JFace-Eclipse/SWTShellcreateanonrectangularwindow.htm