Before launching the window, just use the appropriate window level, and you’re done.
For example,
window.level = NSWindow.Level.popUpMenu
Or, if you want a higher level:
window.level = NSWindow.Level.screenSaver
You can see all the window levels on Apple Documentation page.
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You can override the flagsChanged() method of NSViewController and have your code like below to detect fn key press and release in macOS:
You can open your app’s window on top of all other open application windows with the below code:
Like Delete key, detection of Escape key press is also slightly different than detecting general key presses.
