How can I get a combination of keys pressed?

Archived Forums Questions & Answers
1

Hello... I'm trying to get a combination of keys pressed or buttons held down.

The right thing is that I want to make a Ctrl+Z function in my proyect, so if I press the key Control, hold down it and then press the Z key, I want that my last action to be eliminated.

I have something like this, but it doesn't work at all...

Event e = Event.current;
if (e.control)
{
   print("control!");
   if (Input.GetKeyDown("Z"))
   {
      print("Deshacer!");
   }

   if (Input.GetKeyDown("Y"))
   {
      print("Rehacer!");
   }
}

You could be a bit more precisely. Where do you use this code? In Update or in OnGUI? What get printed? nothing? As i said in my answer, Event is only for GUI events and is only available in OnGUI

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3 Answers

3
2

The Event class should only be used in OnGUI() and the Input class should not be used in OnGUI.

For combination like CTRL-Z you can use:

void OnGUI()
{
    Event e = Event.current;
    if (e.type == EventType.KeyDown && e.control && e.keyCode == KeyCode.Z)
    {
        // CTRL + Z
    }
}

or what should also work:

void Update()
{
    if ((Input.GetKey(KeyCode.RightControl) || Input.GetKey(KeyCode.LeftControl)) && Input.GetKeyDown(KeyCode.Z))
    {
        // CTRL + Z
    }
}

@Alejandro: Be warned that while testing in the editor, Ctrl Z may not appear to function properly; in my tests Unity actually thought I was trying to undo something and it never registered in the game. However, when I built the game, the same script worked fine.

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Sure, that's one of those combinations that won't work in the editor properly. ;)

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Is there a workaround to make it work in Editor?

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@paulius-liekis: Not really. It is a built-in combination of the editor itself, like CTRL+ALT+DEL is built-in the OS. You either use a different combination or use it only in your final build.

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I beleive something like this would work as a work around/Make it so you don't have to remember to change it on final build: #if UNITY_EDITOR if(Input.GetKey(KeyCode.Z)) #else if((Input.GetKey(KeyCode.RightControl) || Input.GetKey(KeyCode.LeftControl)) && Input.GetKeyDown(KeyCode.Z)) #endif { UndoLastAction(); }

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3

this might be useful for anyone running this question:

4

On Unity 2018.2.7f1 for Linux, please use this:

            Event e = Event.current;
            if (e.type == EventType.KeyUp && e.control && e.keyCode == KeyCode.S)
            {
                    Debug.Log("SAVE");
            }

I don't get this answer. You use a different key combination and use the keyup event. What's the reason for that? Note that CTRL + Z obviously doesn't work properly inside the editor but does work inside a build (as discussed above). Without giving a proper reason for your suggested change this answer seems pretty pointless.

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