Source/Controls/NonClientHook.cs

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using System;
using System.Windows.Forms;
using System.Collections;
using System.Threading;
using System.Drawing;
using System.Runtime.InteropServices;

namespace DevComponents.DotNetBar
{
    /// <summary>
    /// Summary description for MessageHandler.
    /// </summary>
    internal class NonClientHook
    {
        private static ArrayList m_Clients = new ArrayList();
        private static Hashtable m_FilterOnThread = new Hashtable();
        private static ReaderWriterLock rwClientsListLock;
        private static MouseProc m_MouseHook = null;

        private delegate IntPtr MouseProc(int nCode, IntPtr wParam, IntPtr lParam);

        [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
        private static extern IntPtr SetWindowsHookEx(int hookid, MouseProc pfnhook, IntPtr hinst, int threadid);

        //[DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true, EntryPoint = "SetWindowsHookEx")]
        //private static extern IntPtr SetWindowsHookExKeyboard(int hookid, KeyboardProc pfnhook, IntPtr hinst, int threadid);

        [DllImport("user32.dll", ExactSpelling = true, CharSet = CharSet.Auto)]
        private static extern bool UnhookWindowsHookEx(IntPtr hhook);

        [DllImport("user32.dll", ExactSpelling = true, CharSet = CharSet.Auto)]
        private static extern IntPtr CallNextHookEx(IntPtr hhook, int code, IntPtr wparam, IntPtr lparam);
        [DllImport("kernel32.dll", ExactSpelling = true, CharSet = CharSet.Auto)]
        private static extern int GetCurrentThreadId();

        private const int WH_MOUSE = 7;
        private const int HC_ACTION = 0;
        private const int WH_CALLWNDPROCRET = 12;
        private const int WH_CALLWNDPROC = 4;

        // Methods
        static NonClientHook()
        {
            NonClientHook.rwClientsListLock = new ReaderWriterLock();
            m_MouseHook = new MouseProc(OnMouseHook);
        }

        public static void RegisterHook(ISkinHook client)
        {
            if (m_Clients.Contains(client))
                return;

            if (!m_FilterOnThread.ContainsKey(System.Threading.Thread.CurrentThread.GetHashCode()))
                HookThread();

            LockCookie cookie1 = new LockCookie();
            bool readerLockHeld = NonClientHook.rwClientsListLock.IsReaderLockHeld;

            if (readerLockHeld)
            {