GifRecorder/Util/UserActivityHook.cs

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

namespace ScreenToGif.Util
{
    /// <summary>
    /// This class allows you to tap keyboard and mouse and / or to detect their activity even when an 
    /// application runes in background or does not have any user interface at all. This class raises 
    /// common .NET events with KeyEventArgs and MouseEventArgs so you can easily retrive any information you need.
    /// </summary>
    public class UserActivityHook
    {
        #region Windows structure definitions

        /// <summary>
        /// The POINT structure defines the x- and y- coordinates of a point. 
        /// </summary>
        /// <remarks>
        /// http://msdn.microsoft.com/library/default.asp?url=/library/en-us/gdi/rectangl_0tiq.asp
        /// </remarks>
        [StructLayout(LayoutKind.Sequential)]
        private class POINT
        {
            /// <summary>
            /// Specifies the x-coordinate of the point. 
            /// </summary>
            public int x;
            /// <summary>
            /// Specifies the y-coordinate of the point. 
            /// </summary>
            public int y;
        }

        /// <summary>
        /// The MOUSEHOOKSTRUCT structure contains information about a mouse event passed to a WH_MOUSE hook procedure, MouseProc. 
        /// </summary>
        /// <remarks>
        /// http://msdn.microsoft.com/library/default.asp?url=/library/en-us/winui/winui/windowsuserinterface/windowing/hooks/hookreference/hookstructures/cwpstruct.asp
        /// </remarks>
        [StructLayout(LayoutKind.Sequential)]
        private class MouseHookStruct
        {
            /// <summary>
            /// Specifies a POINT structure that contains the x- and y-coordinates of the cursor, in screen coordinates. 
            /// </summary>
            public POINT pt;
            /// <summary>
            /// Handle to the window that will receive the mouse message corresponding to the mouse event. 
            /// </summary>
            public int hwnd;
            /// <summary>
            /// Specifies the hit-test value. For a list of hit-test values, see the description of the WM_NCHITTEST message. 
            /// </summary>
            public int wHitTestCode;
            /// <summary>
            /// Specifies extra information associated with the message. 
            /// </summary>