KeyGesture.cs

using Gondwana.Input.Keyboard;
 
namespace Gondwana.Widgets.Menus;

public readonly record struct KeyGesture
{
    public KeyGesture(int key, KeyboardModifierState modifiers = KeyboardModifierState.None)
    {
        if (key <= 0)
            throw new ArgumentOutOfRangeException(nameof(key));
        if ((modifiers & ~(KeyboardModifierState.Ctrl | KeyboardModifierState.Shift | KeyboardModifierState.Alt)) != 0)
            throw new ArgumentOutOfRangeException(nameof(modifiers));
        Key = key;
        Modifiers = modifiers;
    }

    public int Key { get; }
    public KeyboardModifierState Modifiers { get; }
    public static KeyGesture Ctrl(int key) => new(key, KeyboardModifierState.Ctrl);
    public static KeyGesture CtrlShift(int key) => new(key, KeyboardModifierState.Ctrl | KeyboardModifierState.Shift);
    public override string ToString()
    {
        string key = Key switch
        {
            >= 65 and <= 90 or >= 48 and <= 57 => ((char)Key).ToString(),
            >= 112 and <= 135 => $"F{Key - 111}",
            8 => "Backspace",
            9 => "Tab",
            13 => "Enter",
            27 => "Esc",
            32 => "Space",
            33 => "PageUp",
            34 => "PageDown",
            35 => "End",
            36 => "Home",
            37 => "Left",
            38 => "Up",
            39 => "Right",
            40 => "Down",
            45 => "Insert",
            46 => "Delete",
            _ => Key.ToString(System.Globalization.CultureInfo.InvariantCulture)
        };
        return (Modifiers.HasFlag(KeyboardModifierState.Ctrl) ? "Ctrl+" : "") +
               (Modifiers.HasFlag(KeyboardModifierState.Alt) ? "Alt+" : "") +
               (Modifiers.HasFlag(KeyboardModifierState.Shift) ? "Shift+" : "") + key;
    }
}