Is there a way to detect if modifier keys still pressed on key up?

[sarunw]

Right now KeyboardShortcuts.onKeyUp recognize key up when users release non-modifier keys.

Is there a way to detect whether modifier keys are still pressed or not?

I want to replicate the "command+tab" behavior where users can cycle through items while modifier keys still down.

[sindresorhus]

There's no built-in support for this. Most use-cases for Command+Tab is for local events, where you don't need this package.

You could do it yourself though. Just use https://swiftpackageindex.com/sindresorhus/keyboardshortcuts/main/documentation/keyboardshortcuts/keyboardshortcuts/events(for:) and make an interval timer on key down and stop it on key up.

[sarunw]

Thanks for the prompt response, but I don't understand the solution provided 😅

Let's say I want to replicate the functionality of Command+Tab with Command+Control+Tab.

After Command+Control+Tab is recognized, what should I check in the timer?

This is the function I try to replicate.

1. After Command+Tab, I want to show opened app.
2. While holding Command, you can release Tab.
3. Press Tab again would move the selection.
4. Release both Command and Tab will select and dismiss the window.

[sindresorhus]

You could maybe register Command+Tab as a global keyboard shortcut, and then have a check for whether the Command key is still pressed, and hide the window if not.

Or you could check for NSEvent.modifierFlags.contains(.command) in keyUp.