using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Runtime.InteropServices;
using System.Windows.Forms;

namespace Cosmos.Compiler.Builder {

    public class KeyState {
        [Flags]
        private enum KeyStates {
          None = 0,
          Down = 1,
          Toggled = 2
        }

        [DllImport("user32.dll", CharSet = CharSet.Auto,
          ExactSpelling = true)]
        private static extern short GetKeyState(int keyCode);

        private static KeyStates GetKeyState(Keys key)
        {
          KeyStates state = KeyStates.None;

          short retVal = GetKeyState((int)key);

          //If the high-order bit is 1, the key is down
          //otherwise, it is up.
          if ((retVal & 0x8000) == 0x8000)
            state |= KeyStates.Down;

          //If the low-order bit is 1, the key is toggled.
          if ((retVal & 1) == 1)
            state |= KeyStates.Toggled;

          return state;
        }

        public static bool IsKeyDown(Keys key)
        {
          return KeyStates.Down ==
            (GetKeyState(key) & KeyStates.Down);
        }

        public static bool IsKeyToggled(Keys key)
        {
          return KeyStates.Toggled ==
            (GetKeyState(key) & KeyStates.Toggled);
        }
    }
}