On Fri, 10 Jul 2020 18:23:58 GMT, Kevin Rushforth <[email protected]> wrote:
> When running a JavaFX application on macOS using a JDK compiled with the > MacOSX 10.13 SDK or later, an undecorated or > transparent stage cannot be programmatically minimized (iconified). The > reason for this failure is that JavaFX only > sets the `NSMiniaturizableWindowMask` bit in the `styleMask` of the > `NSWindow` for decorated windows. Previous versions > of the MacOSX SDK would minimize and restore a windows regardless of the > setting of this flag. When the application is > compiled against a newer SDK, Apple honors that flag and prevents the window > from being minimized. Note that it is the > version of the SDK used to compile the JDK and not the version that is used > to compile JavaFX that exposes this bug. > The fix is to temporarily set the `NSMiniaturizableWindowMask` prior to > calling `miniaturize` or `deminiaturize`, and > restore it afterwards. This seems safer than setting the bit unconditionally > when the NSWindow is created, which would > have been another approach. A similar fix was done for AWT. See > [JDK-8214046](https://bugs.openjdk.java.net/browse/JDK-8214046). I propose > to fix this in JavaFX 15, so it it targeted > to the `jfx15` branch. On a related note, even after this fix, an undecorated window cannot be restored (deminiaturized) programmatically. This is not related and is not a regression. I filed [JDK-8249202](https://bugs.openjdk.java.net/browse/JDK-8249202) to track this as a follow-up issue. ------------- PR: https://git.openjdk.java.net/jfx/pull/264
