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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Delete key press detection is slightly different than other keys. It uses NSDeleteCharacter like below:
Adding Global Keyboard Shortcuts to your macOS app can be a pain as there isn’t a Cocoa API for the same. You would have to rely on the old, most of which are deprecated, Carbon API.
You can override the flagsChanged() method of NSViewController and have your code like below to detect fn key press and release in macOS:
