Unity To Godot Migration guide: button click callbacks in code

Often we need to know when a button is clicked. The tutorials in Godot guide you toward setting up a signal that gets sent to your script. This is annoying to wireup, but it’s actually quite simple to do in code -

public partial class MyButton : Button
{
    public Action<MyButton> OnPressedCallback;
    
    public override void _Ready()
    {
        this.Pressed += OnPressed;
    }

    private void OnPressed()
    { 
        GD.Print("MyButton.OnPressed!");
        OnPressedCallback.Invoke(this);
    }
}