Is there a public / supported way to get notified when an OS-decorated window (native title pane from macOS, Windows, etc) is moved around or resized by the user grabbing the title bar or the border?
I want to get notified on that process starting so that I can hide all the popups. What I see is that at [1] this is how Swing's popup menu registers itself to get notified on window grabbing. Note that it's using internal, undocumented and inaccessible event mask. Then at [2] it gets notified that the window has been ungrabbed so that it can hide itself. Again, internal and inaccessible event class. And there's also APIs at [3] to grab / ungrab windows to have the whole process rolling. Are there alternatives to these internal APIs that have been exposed as part of hiding the implementation details? The only thing I could find so far is adding a component listener to the frame, but "componentMoved" is called with a noticeable lag, hundreds of milliseconds after the window has started moving. [1] https://github.com/openjdk/jdk/blob/master/src/java.desktop/share/classes/javax/swing/plaf/basic/BasicPopupMenuUI.java#L790 [2] https://github.com/openjdk/jdk/blob/master/src/java.desktop/share/classes/javax/swing/plaf/basic/BasicPopupMenuUI.java#L861 [3] https://github.com/openjdk/jdk/blob/master/src/java.desktop/share/classes/sun/awt/SunToolkit.java#L1641
