﻿/*
* Copyright (c) 2011, Cloud Hsu
* All rights reserved.
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
*     * Redistributions of source code must retain the above copyright
*       notice, this list of conditions and the following disclaimer.
*     * Redistributions in binary form must reproduce the above copyright
*       notice, this list of conditions and the following disclaimer in the
*       documentation and/or other materials provided with the distribution.
*     * Neither the name of the Cloud Hsu nor the
*       names of its contributors may be used to endorse or promote products
*       derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY CLOUD HSU "AS IS" AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE REGENTS AND CONTRIBUTORS BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

using System;
using System.Runtime.InteropServices;
using System.Windows.Forms;

namespace CloudBox.EasyHook
{
    public class KeyboardInfo
    {
        private KeyboardInfo() { }
        [DllImport("user32")]
        private static extern short GetKeyState(int vKey);
        public static KeyStateInfo GetKeyState(Keys key)
        {
            int vkey = (int)key;
            if (key == Keys.Alt)
            {
                vkey = 0x12;    // VK_ALT
            }
            short keyState = GetKeyState(vkey);
            byte[] bits = BitConverter.GetBytes(keyState);
            bool toggled = bits[0] > 0, pressed = bits[1] > 0;
            return new KeyStateInfo(key, pressed, toggled);
        }
    }

    public struct KeyStateInfo
    {
        Keys m_key;
        bool m_isPressed,
             m_isToggled;
        public KeyStateInfo(Keys key,
                        bool ispressed,
                        bool istoggled)
        {
            m_key = key;
            m_isPressed = ispressed;
            m_isToggled = istoggled;
        }
        public static KeyStateInfo Default
        {
            get
            {
                return new KeyStateInfo(Keys.None, false, false);
            }
        }
        public Keys Key
        {
            get { return m_key; }
        }
        public bool IsPressed
        {
            get { return m_isPressed; }
        }
        public bool IsToggled
        {
            get { return m_isToggled; }
        }
    }
}
