Ctrl, Alt, Cmd and Shift key not recognized on mac (Unity 3D)

Question

I am exporting a windows game on mac using unity 3D and I am encountering some issues with the key binding: CTRL, ALT, CMD and SHIFT key are not recognized at all (no errors).

I used the following code to see if anything was detected, and it worked for all keys except CTRL, ALT, CMD and SHIFT.

void OnGUI() 
    {
        Event e = Event.current;

            //vérifier si une touche est bien pressée
            if (e.isKey)
            {
                Debug.Log("Detected key code: " + e.keyCode);
                txt.text = e.keyCode.ToString();
                txt2.text = "normal";
            }

            if(e.modifiers == EventModifiers.Alt)
            {
                txt.text = e.keyCode.ToString();
                txt2.text = "modif";
            }
    }

Is there a way to make this work ? Thanks in advance.

cmd/alt/ctrl are key modifiers. Look for event modifier flags — Marek H, Aug 02 '21 at 11:27
@MarekH I tried your idea, but still not recognized. I made a test code using: e.modifiers == EventModifiers.Alt just to see if alt was detected and no, it's not (it is on windows but not on macOS). — Infamous Jox, Aug 02 '21 at 12:00
Are you pressing key together with modifier? Can you update the code how you check for modifiers? — Marek H, Aug 02 '21 at 17:10
I am not sure if event will be fired/delivered if you press only modifier key — Marek H, Aug 02 '21 at 18:50
@MarekH well it does on windows… Is there any other way to detect those keys individually on Mac? — Infamous Jox, Aug 03 '21 at 08:40
detect with flagsChanged https://stackoverflow.com/questions/4101669/get-modifierflags-in-keydown-event-without-pressing-non-modifier-key-along-with or override sendEvent: and check for modifierflags there. I understand this is Cocoa but it's a recipe for you what information to look for — Marek H, Aug 03 '21 at 12:19

score 0 · Answer 1 · answered Aug 05 '21 at 10:19

Okay, after testing a few things, I think I noticed something. Modifier keys don’t seem to produce any keycode on macOs (with the previous method), but can be detected by searching the very same keycode.

The solution I ended up with is obviously not optimal, but works : I had to test every keycode of modifiers to see if they were pressed and manually assign them the corresponding keycode (yeah that’s dumb)…

This is a succession of the code below :

if(Input.GetKeyDown(Keycode.LeftAlt))
{
newKey = Keycode.LeftAlt;
}

I know this is really stupid to do it this way, but that is the only one that worked so far. Thanks for your help.

Ctrl, Alt, Cmd and Shift key not recognized on mac (Unity 3D)

1 Answers1