大寶庫

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Forms;
using System.Windows.Interop;
using System.Collections;

namespace ThunderStarter
{
    /// <summary>
    /// 直接構造類實例即可注冊
    /// 自動完成注銷
    /// 注意注冊時會拋出異常
    /// </summary>
    class HotKey
        //注冊系統熱鍵類
        //熱鍵會隨著程序結束自動解除,不會寫入注冊表
    {
        #region Member

        int KeyId ;         //熱鍵編號
        IntPtr Handle ;     //窗體句柄
        Window window ;     //熱鍵所在窗體
        uint Controlkey ;   //熱鍵控制鍵
        uint Key ;          //熱鍵主鍵

        public delegate void OnHotkeyEventHandeler();     //熱鍵事件委托
        public event OnHotkeyEventHandeler OnHotKey=null;   //熱鍵事件    

        static Hashtable KeyPair = new Hashtable();         //熱鍵哈希表

        private const int WM_HOTKEY = 0x0312;       // 熱鍵消息編號

        public enum KeyFlags    //控制鍵編碼
        {
            MOD_ALT = 0x1,
            MOD_CONTROL = 0x2,
            MOD_SHIFT = 0x4,
            MOD_WIN = 0x8
        }        

        #endregion

        /// <summary>
        /// 構造函數
        /// </summary>
        /// <param name="win">注冊窗體</param>
        /// <param name="control">控制鍵</param>
        /// <param name="key">主鍵</param>
        public HotKey(Window win, HotKey.KeyFlags control, Keys key)
            //構造函數,注冊熱鍵
        {
            Handle = new WindowInteropHelper(win).Handle;
            window=win;
            Controlkey = (uint)control;
            Key = (uint)key;
            KeyId=(int)Controlkey+(int)Key*10;
            if (HotKey.KeyPair.ContainsKey(KeyId))
            {
                throw new Exception("熱鍵已經被注冊!");
            }

            //注冊熱鍵
            if(false == HotKey.RegisterHotKey(Handle, KeyId, Controlkey, Key))
            {
                throw new Exception("熱鍵注冊失敗!");
            }
            if(HotKey.KeyPair.Count==0){
                //消息掛鉤只能連接一次!!
                if(false == InstallHotKeyHook(this))
                {
                    throw new Exception("消息掛鉤連接失敗!");
                }
            }

            //添加這個熱鍵索引
            HotKey.KeyPair.Add(KeyId, this);
            
        }

        #region core

        [System.Runtime.InteropServices.DllImport("user32")]
        private static extern bool RegisterHotKey(IntPtr hWnd, int id, uint controlKey, uint virtualKey);
                
        [System.Runtime.InteropServices.DllImport("user32")]
        private static extern bool UnregisterHotKey(IntPtr hWnd, int id);
        
        static private bool InstallHotKeyHook(HotKey hk)
            //安裝熱鍵處理掛鉤
        {
            if (hk.window == null || hk.Handle==IntPtr.Zero)
                return false;

            //獲得消息源
            System.Windows.Interop.HwndSource source = System.Windows.Interop.HwndSource.FromHwnd(hk.Handle);
            if (source==null)  return false;

            //掛接事件
            source.AddHook(HotKey.HotKeyHook);
            return true;
        }
       
        static private IntPtr HotKeyHook(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)
            //熱鍵處理過程
        {
            if (msg == WM_HOTKEY)
            {
                HotKey hk = (HotKey)HotKey.KeyPair[(int)wParam];
                if (hk.OnHotKey != null)   hk.OnHotKey();                    
            }    
            return IntPtr.Zero;
        }
 
        ~HotKey()
            //析構函數,解除熱鍵
        {
           HotKey.UnregisterHotKey(Handle, KeyId);
        }

        #endregion
    }
}