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

namespace TradeIdeas.TIProGUI
{
    public class KeyboardPointer : IDisposable
    {
        [DllImport("user32.dll", CharSet = CharSet.Unicode)]
        static extern short VkKeyScanEx(char ch, IntPtr dwhkl);
        [DllImport("user32.dll")]
        static extern bool UnloadKeyboardLayout(IntPtr hkl);
        [DllImport("user32.dll")]
        static extern IntPtr LoadKeyboardLayout(string pwszKLID, uint Flags);
        private readonly IntPtr pointer;
        public KeyboardPointer(int klid)
        {
            pointer = LoadKeyboardLayout(klid.ToString("X8"), 1);
        }
        public KeyboardPointer(CultureInfo culture)
          : this(culture.KeyboardLayoutId) { }
        public void Dispose()
        {
            UnloadKeyboardLayout(pointer);
            GC.SuppressFinalize(this);
        }
        ~KeyboardPointer()
        {
            UnloadKeyboardLayout(pointer);
        }
        // Converting to System.Windows.Forms.Key here, but
        // some other enumerations for similar tasks have the same
        // one-to-one mapping to the underlying Windows API values
        public bool GetKey(char character, out Keys key)
        {
            short keyNumber = VkKeyScanEx(character, pointer);
            if (keyNumber == -1)
            {
                key = Keys.None;
                return false;
            }
            key = (Keys)(((keyNumber & 0xFF00) << 8) | (keyNumber & 0xFF));
            return true;
        }
    }
}