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I have a window (derived from JFrame) and I want to disable the close button during certain operations which are not interruptible. I know I can make the button not do anything (or call a handler in a WindowListener) by calling
setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE); but I would like to make it clear visually that it is pointless to click it.
If I understand it correctly, this bug report indicates that this is currently not possible.