//    This file is part of QTTabBar, a shell extension for Microsoft
//    Windows Explorer.
//    Copyright (C) 2007-2022  Quizo, Paul Accisano, indiff
//
//    QTTabBar is free software: you can redistribute it and/or modify
//    it under the terms of the GNU General Public License as published by
//    the Free Software Foundation, either version 3 of the License, or
//    (at your option) any later version.
//
//    QTTabBar is distributed in the hope that it will be useful,
//    but WITHOUT ANY WARRANTY; without even the implied warranty of
//    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//    GNU General Public License for more details.
//
//    You should have received a copy of the GNU General Public License
//    along with QTTabBar.  If not, see <http://www.gnu.org/licenses/>.

using System;

/// <summary>
/// Windows Messages
/// Defined in winuser.h from Windows SDK v6.1
/// Documentation pulled from MSDN.
/// </summary>
namespace QTTabBarLib.Interop {
    public static class WM {

        /// <summary>
        /// The WM_NULL message performs no operation. An application sends the
        /// WM_NULL message if it wants to post a message that the recipient
        /// window will ignore.
        /// </summary>
        public const Int32 NULL = 0x0000;

        /// <summary>
        /// The WM_CREATE message is sent when an application requests that a
        /// window be created by calling the CreateWindowEx or CreateWindow
        /// function. (The message is sent before the function returns.) The
        /// window procedure of the new window receives this message after the
        /// window is created; but before the window becomes visible.
        /// </summary>
        public const Int32 CREATE = 0x0001;

        /// <summary>
        /// The WM_DESTROY message is sent when a window is being destroyed. It
        /// is sent to the window procedure of the window being destroyed after
        /// the window is removed from the screen.
        /// This message is sent first to the window being destroyed and then to
        /// the child windows (if any) as they are destroyed. During the
        /// processing of the message; it can be assumed that all child windows
        /// still exist.
        /// </summary>
        public const Int32 DESTROY = 0x0002;

        /// <summary>
        /// The WM_MOVE message is sent after a window has been moved.
        /// </summary>
        public const Int32 MOVE = 0x0003;

        /// <summary>
        /// The WM_SIZE message is sent to a window after its size has changed.
        /// </summary>
        public const Int32 SIZE = 0x0005;

        /// <summary>
        /// The WM_ACTIVATE message is sent to both the window being activated
        /// and the window being deactivated. If the windows use the same input
        /// queue; the message is sent synchronously; first to the window
        /// procedure of the top-level window being deactivated; then to the
        /// window procedure of the top-level window being activated. If the
        /// windows use different input queues; the message is sent
        /// asynchronously; so the window is activated immediately.
        /// </summary>
        public const Int32 ACTIVATE = 0x0006;

        /// <summary>
        /// The WM_SETFOCUS message is sent to a window after it has gained the
        /// keyboard focus.
        /// </summary>
        public const Int32 SETFOCUS = 0x0007;

        /// <summary>
        /// The WM_KILLFOCUS message is sent to a window immediately before it
        /// loses the keyboard focus.
        /// </summary>
        public const Int32 KILLFOCUS = 0x0008;

        /// <summary>
        /// The WM_ENABLE message is sent when an application changes the
        /// enabled state of a window. It is sent to the window whose enabled
        /// state is changing. This message is sent before the EnableWindow
        /// function returns; but after the enabled state (WS_DISABLED style
        /// bit) of the window has changed.
        /// </summary>
        public const Int32 ENABLE = 0x000A;

        /// <summary>
        /// An application sends the WM_SETREDRAW message to a window to allow
        /// changes in that window to be redrawn or to prevent changes in that
        /// window from being redrawn.
        /// </summary>
        public const Int32 SETREDRAW = 0x000B;

        /// <summary>
        /// An application sends a WM_SETTEXT message to set the text of a
        /// window.
        /// </summary>
        public const Int32 SETTEXT = 0x000C;

        /// <summary>
        /// An application sends a WM_GETTEXT message to copy the text that
        /// corresponds to a window into a buffer provided by the caller.
        /// </summary>
        public const Int32 GETTEXT = 0x000D;

        /// <summary>
        /// An application sends a WM_GETTEXTLENGTH message to determine the
        /// length; in characters; of the text associated with a window.
        /// </summary>
        public const Int32 GETTEXTLENGTH = 0x000E;

        /// <summary>
        /// The WM_PAINT message is sent when the system or another application
        /// makes a request to paint a portion of an application's window. The
        /// message is sent when the UpdateWindow or RedrawWindow function is
        /// called; or by the DispatchMessage function when the application
        /// obtains a WM_PAINT message by using the GetMessage or PeekMessage
        /// function.
        /// </summary>
        public const Int32 PAINT = 0x000F;

        /// <summary>
        /// The WM_CLOSE message is sent as a signal that a window or an
        /// application should terminate.
        /// </summary>
        public const Int32 CLOSE = 0x0010;

        /// <summary>
        /// The WM_QUERYENDSESSION message is sent when the user chooses to end
        /// the session or when an application calls one of the system shutdown
        /// functions. If any application returns zero; the session is not
        /// ended. The system stops sending WM_QUERYENDSESSION messages as soon
        /// as one application returns zero.
        /// After processing this message; the system sends the WM_ENDSESSION
        /// message with the wParam parameter set to the results of the
        /// WM_QUERYENDSESSION message.
        /// </summary>
        public const Int32 QUERYENDSESSION = 0x0011;

        /// <summary>
        /// The WM_QUIT message indicates a request to terminate an application
        /// and is generated when the application calls the PostQuitMessage
        /// function. It causes the GetMessage function to return zero.
        /// </summary>
        public const Int32 QUIT = 0x0012;

        /// <summary>
        /// The WM_QUERYOPEN message is sent to an icon when the user requests
        /// that the window be restored to its previous size and position.
        /// </summary>
        public const Int32 QUERYOPEN = 0x0013;

        /// <summary>
        /// The WM_ERASEBKGND message is sent when the window background must be
        /// erased (for example; when a window is resized). The message is sent
        /// to prepare an invalidated portion of a window for painting.
        /// </summary>
        public const Int32 ERASEBKGND = 0x0014;

        /// <summary>
        /// This message is sent to all top-level windows when a change is made
        /// to a system color setting.
        /// </summary>
        public const Int32 SYSCOLORCHANGE = 0x0015;

        /// <summary>
        /// The WM_ENDSESSION message is sent to an application after the system
        /// processes the results of the WM_QUERYENDSESSION message. The
        /// WM_ENDSESSION message informs the application whether the session is
        /// ending.
        /// </summary>
        public const Int32 ENDSESSION = 0x0016;

        /// <summary>
        /// The WM_SHOWWINDOW message is sent to a window when the window is
        /// about to be hidden or shown.
        /// </summary>
        public const Int32 SHOWWINDOW = 0x0018;

        /// <summary>
        /// An application sends the WM_WININICHANGE message to all top-level
        /// windows after making a change to the WIN.INI file. The
        /// SystemParametersInfo function sends this message after an
        /// application uses the function to change a setting in WIN.INI.
        /// Note  The WM_WININICHANGE message is provided only for compatibility
        /// with earlier versions of the system. Applications should use the
        /// WM_SETTINGCHANGE message.
        /// </summary>
        public const Int32 WININICHANGE = 0x001A;

        /// <summary>
        /// An application sends the WM_WININICHANGE message to all top-level
        /// windows after making a change to the WIN.INI file. The
        /// SystemParametersInfo function sends this message after an
        /// application uses the function to change a setting in WIN.INI.
        /// Note  The WM_WININICHANGE message is provided only for compatibility
        /// with earlier versions of the system. Applications should use the
        /// WM_SETTINGCHANGE message.
        /// </summary>
        public const Int32 SETTINGCHANGE = WININICHANGE;

        /// <summary>
        /// The WM_DEVMODECHANGE message is sent to all top-level windows
        /// whenever the user changes device-mode settings.
        /// </summary>
        public const Int32 DEVMODECHANGE = 0x001B;

        /// <summary>
        /// The WM_ACTIVATEAPP message is sent when a window belonging to a
        /// different application than the active window is about to be
        /// activated. The message is sent to the application whose window is
        /// being activated and to the application whose window is being
        /// deactivated.
        /// </summary>
        public const Int32 ACTIVATEAPP = 0x001C;

        /// <summary>
        /// An application sends the WM_FONTCHANGE message to all top-level
        /// windows in the system after changing the pool of font resources.
        /// </summary>
        public const Int32 FONTCHANGE = 0x001D;

        /// <summary>
        /// A message that is sent whenever there is a change in the system
        /// time.
        /// </summary>
        public const Int32 TIMECHANGE = 0x001E;

        /// <summary>
        /// The WM_CANCELMODE message is sent to cancel certain modes; such as
        /// mouse capture. For example; the system sends this message to the
        /// active window when a dialog box or message box is displayed. Certain
        /// functions also send this message explicitly to the specified window
        /// regardless of whether it is the active window. For example; the
        /// EnableWindow function sends this message when disabling the
        /// specified window.
        /// </summary>
        public const Int32 CANCELMODE = 0x001F;

        /// <summary>
        /// The WM_SETCURSOR message is sent to a window if the mouse causes the
        /// cursor to move within a window and mouse input is not captured.
        /// </summary>
        public const Int32 SETCURSOR = 0x0020;

        /// <summary>
        /// The WM_MOUSEACTIVATE message is sent when the cursor is in an
        /// inactive window and the user presses a mouse button. The parent
        /// window receives this message only if the child window passes it to
        /// the DefWindowProc function.
        /// </summary>
        public const Int32 MOUSEACTIVATE = 0x0021;

        /// <summary>
        /// The WM_CHILDACTIVATE message is sent to a child window when the user
        /// clicks the window's title bar or when the window is activated;
        /// moved; or sized.
        /// </summary>
        public const Int32 CHILDACTIVATE = 0x0022;

        /// <summary>
        /// The WM_QUEUESYNC message is sent by a computer-based training (CBT)
        /// application to separate user-input messages from other messages sent
        /// through the WH_JOURNALPLAYBACK Hook procedure.
        /// </summary>
        public const Int32 QUEUESYNC = 0x0023;

        /// <summary>
        /// The WM_GETMINMAXINFO message is sent to a window when the size or
        /// position of the window is about to change. An application can use
        /// this message to override the window's default maximized size and
        /// position; or its default minimum or maximum tracking size.
        /// </summary>
        public const Int32 GETMINMAXINFO = 0x0024;

        /// <summary>
        /// Windows NT 3.51 and earlier: The WM_PAINTICON message is sent to a
        /// minimized window when the icon is to be painted. This message is not
        /// sent by newer versions of Microsoft Windows; except in unusual
        /// circumstances explained in the Remarks.
        /// </summary>
        public const Int32 PAINTICON = 0x0026;

        /// <summary>
        /// Windows NT 3.51 and earlier: The WM_ICONERASEBKGND message is sent
        /// to a minimized window when the background of the icon must be filled
        /// before painting the icon. A window receives this message only if a
        /// class icon is defined for the window; otherwise; WM_ERASEBKGND is
        /// sent. This message is not sent by newer versions of Windows.
        /// </summary>
        public const Int32 ICONERASEBKGND = 0x0027;

        /// <summary>
        /// The WM_NEXTDLGCTL message is sent to a dialog box procedure to set
        /// the keyboard focus to a different control in the dialog box.
        /// </summary>
        public const Int32 NEXTDLGCTL = 0x0028;

        /// <summary>
        /// The WM_SPOOLERSTATUS message is sent from Print Manager whenever a
        /// job is added to or removed from the Print Manager queue.
        /// </summary>
        public const Int32 SPOOLERSTATUS = 0x002A;

        /// <summary>
        /// The WM_DRAWITEM message is sent to the parent window of an
        /// owner-drawn button; combo box; list box; or menu when a visual
        /// aspect of the button; combo box; list box; or menu has changed.
        /// </summary>
        public const Int32 DRAWITEM = 0x002B;

        /// <summary>
        /// The WM_MEASUREITEM message is sent to the owner window of a combo
        /// box; list box; list view control; or menu item when the control or
        /// menu is created.
        /// </summary>
        public const Int32 MEASUREITEM = 0x002C;

        /// <summary>
        /// Sent to the owner of a list box or combo box when the list box or
        /// combo box is destroyed or when items are removed by the
        /// LB_DELETESTRING; LB_RESETCONTENT; CB_DELETESTRING; or
        /// CB_RESETCONTENT message. The system sends a WM_DELETEITEM message
        /// for each deleted item. The system sends the WM_DELETEITEM message
        /// for any deleted list box or combo box item with nonzero item data.
        /// </summary>
        public const Int32 DELETEITEM = 0x002D;

        /// <summary>
        /// Sent by a list box with the LBS_WANTKEYBOARDINPUT style to its owner
        /// in response to a WM_KEYDOWN message.
        /// </summary>
        public const Int32 VKEYTOITEM = 0x002E;

        /// <summary>
        /// Sent by a list box with the LBS_WANTKEYBOARDINPUT style to its owner
        /// in response to a WM_CHAR message.
        /// </summary>
        public const Int32 CHARTOITEM = 0x002F;

        /// <summary>
        /// An application sends a WM_SETFONT message to specify the font that a
        /// control is to use when drawing text.
        /// </summary>
        public const Int32 SETFONT = 0x0030;

        /// <summary>
        /// An application sends a WM_GETFONT message to a control to retrieve
        /// the font with which the control is currently drawing its text.
        /// </summary>
        public const Int32 GETFONT = 0x0031;

        /// <summary>
        /// An application sends a WM_SETHOTKEY message to a window to associate
        /// a hot key with the window. When the user presses the hot key; the
        /// system activates the window.
        /// </summary>
        public const Int32 SETHOTKEY = 0x0032;

        /// <summary>
        /// An application sends a WM_GETHOTKEY message to determine the hot key
        /// associated with a window.
        /// </summary>
        public const Int32 GETHOTKEY = 0x0033;

        /// <summary>
        /// The WM_QUERYDRAGICON message is sent to a minimized (iconic) window.
        /// The window is about to be dragged by the user but does not have an
        /// icon defined for its class. An application can return a handle to an
        /// icon or cursor. The system displays this cursor or icon while the
        /// user drags the icon.
        /// </summary>
        public const Int32 QUERYDRAGICON = 0x0037;

        /// <summary>
        /// The system sends the WM_COMPAREITEM message to determine the
        /// relative position of a new item in the sorted list of an owner-drawn
        /// combo box or list box. Whenever the application adds a new item; the
        /// system sends this message to the owner of a combo box or list box
        /// created with the CBS_SORT or LBS_SORT style.
        /// </summary>
        public const Int32 COMPAREITEM = 0x0039;

        /// <summary>
        /// Active Accessibility sends the WM_GETOBJECT message to obtain
        /// information about an accessible object contained in a server
        /// application.
        /// Applications never send this message directly. It is sent only by
        /// Active Accessibility in response to calls to
        /// AccessibleObjectFromPoint; AccessibleObjectFromEvent; or
        /// AccessibleObjectFromWindow. However; server applications handle this
        /// message.
        /// </summary>
        public const Int32 GETOBJECT = 0x003D;

        /// <summary>
        /// The WM_COMPACTING message is sent to all top-level windows when the
        /// system detects more than 12.5 percent of system time over a 30- to
        /// 60-second interval is being spent compacting memory. This indicates
        /// that system memory is low.
        /// </summary>
        public const Int32 COMPACTING = 0x0041;

        /// <summary>
        /// WM_COMMNOTIFY is Obsolete for Win32-Based Applications
        /// </summary>
        [Obsolete]
        public const Int32 COMMNOTIFY = 0x0044;

        /// <summary>
        /// The WM_WINDOWPOSCHANGING message is sent to a window whose size;
        /// position; or place in the Z order is about to change as a result of
        /// a call to the SetWindowPos function or another window-management
        /// function.
        /// </summary>
        public const Int32 WINDOWPOSCHANGING = 0x0046;

        /// <summary>
        /// The WM_WINDOWPOSCHANGED message is sent to a window whose size;
        /// position; or place in the Z order has changed as a result of a call
        /// to the SetWindowPos function or another window-management function.
        /// </summary>
        public const Int32 WINDOWPOSCHANGED = 0x0047;

        /// <summary>
        /// Notifies applications that the system; typically a battery-powered
        /// personal computer; is about to enter a suspended mode.
        /// Use: POWERBROADCAST
        /// </summary>
        [Obsolete]
        public const Int32 POWER = 0x0048;

        /// <summary>
        /// An application sends the WM_COPYDATA message to pass data to another
        /// application.
        /// </summary>
        public const Int32 COPYDATA = 0x004A;

        /// <summary>
        /// The WM_CANCELJOURNAL message is posted to an application when a user
        /// cancels the application's journaling activities. The message is
        /// posted with a NULL window handle.
        /// </summary>
        public const Int32 CANCELJOURNAL = 0x004B;

        /// <summary>
        /// Sent by a common control to its parent window when an event has
        /// occurred or the control requires some information.
        /// </summary>
        public const Int32 NOTIFY = 0x004E;

        /// <summary>
        /// The WM_INPUTLANGCHANGEREQUEST message is posted to the window with
        /// the focus when the user chooses a new input language; either with
        /// the hotkey (specified in the Keyboard control panel application) or
        /// from the indicator on the system taskbar. An application can accept
        /// the change by passing the message to the DefWindowProc function or
        /// reject the change (and prevent it from taking place) by returning
        /// immediately.
        /// </summary>
        public const Int32 INPUTLANGCHANGEREQUEST = 0x0050;

        /// <summary>
        /// The WM_INPUTLANGCHANGE message is sent to the topmost affected
        /// window after an application's input language has been changed. You
        /// should make any application-specific settings and pass the message
        /// to the DefWindowProc function; which passes the message to all
        /// first-level child windows. These child windows can pass the message
        /// to DefWindowProc to have it pass the message to their child windows;
        /// and so on.
        /// </summary>
        public const Int32 INPUTLANGCHANGE = 0x0051;

        /// <summary>
        /// Sent to an application that has initiated a training card with
        /// Microsoft Windows Help. The message informs the application when the
        /// user clicks an authorable button. An application initiates a
        /// training card by specifying the HELP_TCARD command in a call to the
        /// WinHelp function.
        /// </summary>
        public const Int32 TCARD = 0x0052;

        /// <summary>
        /// Indicates that the user pressed the F1 key. If a menu is active when
        /// F1 is pressed; WM_HELP is sent to the window associated with the
        /// menu; otherwise; WM_HELP is sent to the window that has the keyboard
        /// focus. If no window has the keyboard focus; WM_HELP is sent to the
        /// currently active window.
        /// </summary>
        public const Int32 HELP = 0x0053;

        /// <summary>
        /// The WM_USERCHANGED message is sent to all windows after the user has
        /// logged on or off. When the user logs on or off; the system updates
        /// the user-specific settings. The system sends this message
        /// immediately after updating the settings.
        /// </summary>
        public const Int32 USERCHANGED = 0x0054;

        /// <summary>
        /// Determines if a window accepts ANSI or Unicode structures in the
        /// WM_NOTIFY notification message. WM_NOTIFYFORMAT messages are sent
        /// from a common control to its parent window and from the parent
        /// window to the common control.
        /// </summary>
        public const Int32 NOTIFYFORMAT = 0x0055;

        /// <summary>
        /// The WM_CONTEXTMENU message notifies a window that the user clicked
        /// the right mouse button (right-clicked) in the window.
        /// </summary>
        public const Int32 CONTEXTMENU = 0x007B;

        /// <summary>
        /// The WM_STYLECHANGING message is sent to a window when the
        /// SetWindowLong function is about to change one or more of the
        /// window's styles.
        /// </summary>
        public const Int32 STYLECHANGING = 0x007C;

        /// <summary>
        /// The WM_STYLECHANGED message is sent to a window after the
        /// SetWindowLong function has changed one or more of the window's
        /// styles
        /// </summary>
        public const Int32 STYLECHANGED = 0x007D;

        /// <summary>
        /// The WM_DISPLAYCHANGE message is sent to all windows when the display
        /// resolution has changed.
        /// </summary>
        public const Int32 DISPLAYCHANGE = 0x007E;

        /// <summary>
        /// The WM_GETICON message is sent to a window to retrieve a handle to
        /// the large or small icon associated with a window. The system
        /// displays the large icon in the ALT+TAB dialog; and the small icon in
        /// the window caption.
        /// </summary>
        public const Int32 GETICON = 0x007F;

        /// <summary>
        /// An application sends the WM_SETICON message to associate a new large
        /// or small icon with a window. The system displays the large icon in
        /// the ALT+TAB dialog box; and the small icon in the window caption.
        /// </summary>
        public const Int32 SETICON = 0x0080;

        /// <summary>
        /// The WM_NCCREATE message is sent prior to the WM_CREATE message when
        /// a window is first created.
        /// </summary>
        public const Int32 NCCREATE = 0x0081;

        /// <summary>
        /// The WM_NCDESTROY message informs a window that its nonclient area is
        /// being destroyed. The DestroyWindow function sends the WM_NCDESTROY
        /// message to the window following the WM_DESTROY message. WM_DESTROY
        /// is used to free the allocated memory object associated with the
        /// window.
        /// The WM_NCDESTROY message is sent after the child windows have been
        /// destroyed. In contrast; WM_DESTROY is sent before the child windows
        /// are destroyed.
        /// </summary>
        public const Int32 NCDESTROY = 0x0082;

        /// <summary>
        /// The WM_NCCALCSIZE message is sent when the size and position of a
        /// window's client area must be calculated. By processing this message;
        /// an application can control the content of the window's client area
        /// when the size or position of the window changes.
        /// </summary>
        public const Int32 NCCALCSIZE = 0x0083;

        /// <summary>
        /// The WM_NCHITTEST message is sent to a window when the cursor moves;
        /// or when a mouse button is pressed or released. If the mouse is not
        /// captured; the message is sent to the window beneath the cursor.
        /// Otherwise; the message is sent to the window that has captured the
        /// mouse.
        /// </summary>
        public const Int32 NCHITTEST = 0x0084;

        /// <summary>
        /// The WM_NCPAINT message is sent to a window when its frame must be
        /// painted.
        /// </summary>
        public const Int32 NCPAINT = 0x0085;

        /// <summary>
        /// The WM_NCACTIVATE message is sent to a window when its nonclient
        /// area needs to be changed to indicate an active or inactive state.
        /// </summary>
        public const Int32 NCACTIVATE = 0x0086;

        /// <summary>
        /// The WM_GETDLGCODE message is sent to the window procedure associated
        /// with a control. By default; the system handles all keyboard input to
        /// the control; the system interprets certain types of keyboard input
        /// as dialog box navigation keys. To override this default behavior;
        /// the control can respond to the WM_GETDLGCODE message to indicate the
        /// types of input it wants to process itself.
        /// </summary>
        public const Int32 GETDLGCODE = 0x0087;

        /// <summary>
        /// The WM_SYNCPAINT message is used to synchronize painting while
        /// avoiding linking independent GUI threads.
        /// </summary>
        public const Int32 SYNCPAINT = 0x0088;

        /// <summary>
        /// The WM_NCMOUSEMOVE message is posted to a window when the cursor is
        /// moved within the nonclient area of the window. This message is
        /// posted to the window that contains the cursor. If a window has
        /// captured the mouse; this message is not posted.
        /// </summary>
        public const Int32 NCMOUSEMOVE = 0x00A0;

        /// <summary>
        /// The WM_NCLBUTTONDOWN message is posted when the user presses the
        /// left mouse button while the cursor is within the nonclient area of a
        /// window. This message is posted to the window that contains the
        /// cursor. If a window has captured the mouse; this message is not
        /// posted.
        /// </summary>
        public const Int32 NCLBUTTONDOWN = 0x00A1;

        /// <summary>
        /// The WM_NCLBUTTONUP message is posted when the user releases the left
        /// mouse button while the cursor is within the nonclient area of a
        /// window. This message is posted to the window that contains the
        /// cursor. If a window has captured the mouse; this message is not
        /// posted.
        /// </summary>
        public const Int32 NCLBUTTONUP = 0x00A2;

        /// <summary>
        /// The WM_NCLBUTTONDBLCLK message is posted when the user double-clicks
        /// the left mouse button while the cursor is within the nonclient area
        /// of a window. This message is posted to the window that contains the
        /// cursor. If a window has captured the mouse; this message is not
        /// posted.
        /// </summary>
        public const Int32 NCLBUTTONDBLCLK = 0x00A3;

        /// <summary>
        /// The WM_NCRBUTTONDOWN message is posted when the user presses the
        /// right mouse button while the cursor is within the nonclient area of
        /// a window. This message is posted to the window that contains the
        /// cursor. If a window has captured the mouse; this message is not
        /// posted.
        /// </summary>
        public const Int32 NCRBUTTONDOWN = 0x00A4;

        /// <summary>
        /// The WM_NCRBUTTONUP message is posted when the user releases the
        /// right mouse button while the cursor is within the nonclient area of
        /// a window. This message is posted to the window that contains the
        /// cursor. If a window has captured the mouse; this message is not
        /// posted.
        /// </summary>
        public const Int32 NCRBUTTONUP = 0x00A5;

        /// <summary>
        /// The WM_NCRBUTTONDBLCLK message is posted when the user double-clicks
        /// the right mouse button while the cursor is within the nonclient area
        /// of a window. This message is posted to the window that contains the
        /// cursor. If a window has captured the mouse; this message is not
        /// posted.
        /// </summary>
        public const Int32 NCRBUTTONDBLCLK = 0x00A6;

        /// <summary>
        /// The WM_NCMBUTTONDOWN message is posted when the user presses the
        /// middle mouse button while the cursor is within the nonclient area of
        /// a window. This message is posted to the window that contains the
        /// cursor. If a window has captured the mouse; this message is not
        /// posted.
        /// </summary>
        public const Int32 NCMBUTTONDOWN = 0x00A7;

        /// <summary>
        /// The WM_NCMBUTTONUP message is posted when the user releases the
        /// middle mouse button while the cursor is within the nonclient area of
        /// a window. This message is posted to the window that contains the
        /// cursor. If a window has captured the mouse; this message is not
        /// posted.
        /// </summary>
        public const Int32 NCMBUTTONUP = 0x00A8;

        /// <summary>
        /// The WM_NCMBUTTONDBLCLK message is posted when the user double-clicks
        /// the middle mouse button while the cursor is within the nonclient
        /// area of a window. This message is posted to the window that contains
        /// the cursor. If a window has captured the mouse; this message is not
        /// posted.
        /// </summary>
        public const Int32 NCMBUTTONDBLCLK = 0x00A9;

        /// <summary>
        /// The WM_NCXBUTTONDOWN message is posted when the user presses the
        /// first or second X button while the cursor is in the nonclient area
        /// of a window. This message is posted to the window that contains the
        /// cursor. If a window has captured the mouse; this message is not
        /// posted.
        /// </summary>
        public const Int32 NCXBUTTONDOWN = 0x00AB;

        /// <summary>
        /// The WM_NCXBUTTONUP message is posted when the user releases the
        /// first or second X button while the cursor is in the nonclient area
        /// of a window. This message is posted to the window that contains the
        /// cursor. If a window has captured the mouse; this message is not
        /// posted.
        /// </summary>
        public const Int32 NCXBUTTONUP = 0x00AC;

        /// <summary>
        /// The WM_NCXBUTTONDBLCLK message is posted when the user double-clicks
        /// the first or second X button while the cursor is in the nonclient
        /// area of a window. This message is posted to the window that contains
        /// the cursor. If a window has captured the mouse; this message is not
        /// posted.
        /// </summary>
        public const Int32 NCXBUTTONDBLCLK = 0x00AD;

        /// <summary>
        /// The WM_INPUT_DEVICE_CHANGE message is sent to the window that
        /// registered to receive raw input. A window receives this message
        /// through its WindowProc function.
        /// </summary>
        public const Int32 INPUT_DEVICE_CHANGE = 0x00FE;

        /// <summary>
        /// The WM_INPUT message is sent to the window that is getting raw
        /// input.
        /// </summary>
        public const Int32 INPUT = 0x00FF;

        /// <summary>
        /// This message filters for keyboard messages.
        /// </summary>
        public const Int32 KEYFIRST = 0x0100;

        /// <summary>
        /// The WM_KEYDOWN message is posted to the window with the keyboard
        /// focus when a nonsystem key is pressed. A nonsystem key is a key that
        /// is pressed when the ALT key is not pressed.
        /// </summary>
        public const Int32 KEYDOWN = 0x0100;

        /// <summary>
        /// The WM_KEYUP message is posted to the window with the keyboard focus
        /// when a nonsystem key is released. A nonsystem key is a key that is
        /// pressed when the ALT key is not pressed; or a keyboard key that is
        /// pressed when a window has the keyboard focus.
        /// </summary>
        public const Int32 KEYUP = 0x0101;

        /// <summary>
        /// The WM_CHAR message is posted to the window with the keyboard focus
        /// when a WM_KEYDOWN message is translated by the TranslateMessage
        /// function. The WM_CHAR message contains the character code of the key
        /// that was pressed.
        /// </summary>
        public const Int32 CHAR = 0x0102;

        /// <summary>
        /// The WM_DEADCHAR message is posted to the window with the keyboard
        /// focus when a WM_KEYUP message is translated by the TranslateMessage
        /// function. WM_DEADCHAR specifies a character code generated by a dead
        /// key. A dead key is a key that generates a character; such as the
        /// umlaut (double-dot); that is combined with another character to form
        /// a composite character. For example; the umlaut-O character (? is
        /// generated by typing the dead key for the umlaut character; and then
        /// typing the O key.
        /// </summary>
        public const Int32 DEADCHAR = 0x0103;

        /// <summary>
        /// The WM_SYSKEYDOWN message is posted to the window with the keyboard
        /// focus when the user presses the F10 key (which activates the menu
        /// bar) or holds down the ALT key and then presses another key. It also
        /// occurs when no window currently has the keyboard focus; in this
        /// case; the WM_SYSKEYDOWN message is sent to the active window. The
        /// window that receives the message can distinguish between these two
        /// contexts by checking the context code in the lParam parameter.
        /// </summary>
        public const Int32 SYSKEYDOWN = 0x0104;

        /// <summary>
        /// The WM_SYSKEYUP message is posted to the window with the keyboard
        /// focus when the user releases a key that was pressed while the ALT
        /// key was held down. It also occurs when no window currently has the
        /// keyboard focus; in this case; the WM_SYSKEYUP message is sent to the
        /// active window. The window that receives the message can distinguish
        /// between these two contexts by checking the context code in the
        /// lParam parameter.
        /// </summary>
        public const Int32 SYSKEYUP = 0x0105;

        /// <summary>
        /// The WM_SYSCHAR message is posted to the window with the keyboard
        /// focus when a WM_SYSKEYDOWN message is translated by the
        /// TranslateMessage function. It specifies the character code of a
        /// system character key - that is; a character key that is pressed
        /// while the ALT key is down.
        /// </summary>
        public const Int32 SYSCHAR = 0x0106;

        /// <summary>
        /// The WM_SYSDEADCHAR message is sent to the window with the keyboard
        /// focus when a WM_SYSKEYDOWN message is translated by the
        /// TranslateMessage function. WM_SYSDEADCHAR specifies the character
        /// code of a system dead key - that is; a dead key that is pressed
        /// while holding down the ALT key.
        /// </summary>
        public const Int32 SYSDEADCHAR = 0x0107;

        /// <summary>
        /// The WM_UNICHAR message is posted to the window with the keyboard
        /// focus when a WM_KEYDOWN message is translated by the
        /// TranslateMessage function. The WM_UNICHAR message contains the
        /// character code of the key that was pressed.
        /// The WM_UNICHAR message is equivalent to WM_CHAR; but it uses Unicode
        /// Transformation Format (UTF)-32; whereas WM_CHAR uses UTF-16. It is
        /// designed to send or post Unicode characters to ANSI windows and it
        /// can can handle Unicode Supplementary Plane characters.
        /// </summary>
        public const Int32 UNICHAR = 0x0109;

        /// <summary>
        /// This message filters for keyboard messages.
        /// </summary>
        public const Int32 KEYLAST = 0x0109;

        /// <summary>
        /// Sent immediately before the IME generates the composition string as
        /// a result of a keystroke. A window receives this message through its
        /// WindowProc function.
        /// </summary>
        public const Int32 IME_STARTCOMPOSITION = 0x010D;

        /// <summary>
        /// Sent to an application when the IME ends composition. A window
        /// receives this message through its WindowProc function.
        /// </summary>
        public const Int32 IME_ENDCOMPOSITION = 0x010E;

        /// <summary>
        /// Sent to an application when the IME changes composition status as a
        /// result of a keystroke. A window receives this message through its
        /// WindowProc function.
        /// </summary>
        public const Int32 IME_COMPOSITION = 0x010F;
        public const Int32 IME_KEYLAST = 0x010F;

        /// <summary>
        /// The WM_INITDIALOG message is sent to the dialog box procedure
        /// immediately before a dialog box is displayed. Dialog box procedures
        /// typically use this message to initialize controls and carry out any
        /// other initialization tasks that affect the appearance of the dialog
        /// box.
        /// </summary>
        public const Int32 INITDIALOG = 0x0110;

        /// <summary>
        /// The WM_COMMAND message is sent when the user selects a command item
        /// from a menu; when a control sends a notification message to its
        /// parent window; or when an accelerator keystroke is translated.
        /// </summary>
        public const Int32 COMMAND = 0x0111;

        /// <summary>
        /// A window receives this message when the user chooses a command from
        /// the Window menu; clicks the maximize button; minimize button;
        /// restore button; close button; or moves the form. You can stop the
        /// form from moving by filtering this out.
        /// </summary>
        public const Int32 SYSCOMMAND = 0x0112;

        /// <summary>
        /// The WM_TIMER message is posted to the installing thread's message
        /// queue when a timer expires. The message is posted by the GetMessage
        /// or PeekMessage function.
        /// </summary>
        public const Int32 TIMER = 0x0113;

        /// <summary>
        /// The WM_HSCROLL message is sent to a window when a scroll event
        /// occurs in the window's standard horizontal scroll bar. This message
        /// is also sent to the owner of a horizontal scroll bar control when a
        /// scroll event occurs in the control.
        /// </summary>
        public const Int32 HSCROLL = 0x0114;

        /// <summary>
        /// The WM_VSCROLL message is sent to a window when a scroll event
        /// occurs in the window's standard vertical scroll bar. This message is
        /// also sent to the owner of a vertical scroll bar control when a
        /// scroll event occurs in the control.
        /// </summary>
        public const Int32 VSCROLL = 0x0115;

        /// <summary>
        /// The WM_INITMENU message is sent when a menu is about to become
        /// active. It occurs when the user clicks an item on the menu bar or
        /// presses a menu key. This allows the application to modify the menu
        /// before it is displayed.
        /// </summary>
        public const Int32 INITMENU = 0x0116;

        /// <summary>
        /// The WM_INITMENUPOPUP message is sent when a drop-down menu or
        /// submenu is about to become active. This allows an application to
        /// modify the menu before it is displayed; without changing the entire
        /// menu.
        /// </summary>
        public const Int32 INITMENUPOPUP = 0x0117;

        /// <summary>
        /// The WM_MENUSELECT message is sent to a menu's owner window when the
        /// user selects a menu item.
        /// </summary>
        public const Int32 MENUSELECT = 0x011F;

        /// <summary>
        /// The WM_MENUCHAR message is sent when a menu is active and the user
        /// presses a key that does not correspond to any mnemonic or
        /// accelerator key. This message is sent to the window that owns the
        /// menu.
        /// </summary>
        public const Int32 MENUCHAR = 0x0120;

        /// <summary>
        /// The WM_ENTERIDLE message is sent to the owner window of a modal
        /// dialog box or menu that is entering an idle state. A modal dialog
        /// box or menu enters an idle state when no messages are waiting in its
        /// queue after it has processed one or more previous messages.
        /// </summary>
        public const Int32 ENTERIDLE = 0x0121;

        /// <summary>
        /// The WM_MENURBUTTONUP message is sent when the user releases the
        /// right mouse button while the cursor is on a menu item.
        /// </summary>
        public const Int32 MENURBUTTONUP = 0x0122;

        /// <summary>
        /// The WM_MENUDRAG message is sent to the owner of a drag-and-drop menu
        /// when the user drags a menu item.
        /// </summary>
        public const Int32 MENUDRAG = 0x0123;

        /// <summary>
        /// The WM_MENUGETOBJECT message is sent to the owner of a drag-and-drop
        /// menu when the mouse cursor enters a menu item or moves from the
        /// center of the item to the top or bottom of the item.
        /// </summary>
        public const Int32 MENUGETOBJECT = 0x0124;

        /// <summary>
        /// The WM_UNINITMENUPOPUP message is sent when a drop-down menu or
        /// submenu has been destroyed.
        /// </summary>
        public const Int32 UNINITMENUPOPUP = 0x0125;

        /// <summary>
        /// The WM_MENUCOMMAND message is sent when the user makes a selection
        /// from a menu.
        /// </summary>
        public const Int32 MENUCOMMAND = 0x0126;

        /// <summary>
        /// An application sends the WM_CHANGEUISTATE message to indicate that
        /// the user interface (UI) state should be changed.
        /// </summary>
        public const Int32 CHANGEUISTATE = 0x0127;

        /// <summary>
        /// An application sends the WM_UPDATEUISTATE message to change the user
        /// interface (UI) state for the specified window and all its child
        /// windows.
        /// </summary>
        public const Int32 UPDATEUISTATE = 0x0128;

        /// <summary>
        /// An application sends the WM_QUERYUISTATE message to retrieve the
        /// user interface (UI) state for a window.
        /// </summary>
        public const Int32 QUERYUISTATE = 0x0129;

        /// <summary>
        /// The WM_CTLCOLORMSGBOX message is sent to the owner window of a
        /// message box before Windows draws the message box. By responding to
        /// this message; the owner window can set the text and background
        /// colors of the message box by using the given display device context
        /// handle.
        /// </summary>
        public const Int32 CTLCOLORMSGBOX = 0x0132;

        /// <summary>
        /// An edit control that is not read-only or disabled sends the
        /// WM_CTLCOLOREDIT message to its parent window when the control is
        /// about to be drawn. By responding to this message; the parent window
        /// can use the specified device context handle to set the text and
        /// background colors of the edit control.
        /// </summary>
        public const Int32 CTLCOLOREDIT = 0x0133;

        /// <summary>
        /// Sent to the parent window of a list box before the system draws the
        /// list box. By responding to this message; the parent window can set
        /// the text and background colors of the list box by using the
        /// specified display device context handle.
        /// </summary>
        public const Int32 CTLCOLORLISTBOX = 0x0134;

        /// <summary>
        /// The WM_CTLCOLORBTN message is sent to the parent window of a button
        /// before drawing the button. The parent window can change the button's
        /// text and background colors. However; only owner-drawn buttons
        /// respond to the parent window processing this message.
        /// </summary>
        public const Int32 CTLCOLORBTN = 0x0135;

        /// <summary>
        /// The WM_CTLCOLORDLG message is sent to a dialog box before the system
        /// draws the dialog box. By responding to this message; the dialog box
        /// can set its text and background colors using the specified display
        /// device context handle.
        /// </summary>
        public const Int32 CTLCOLORDLG = 0x0136;

        /// <summary>
        /// The WM_CTLCOLORSCROLLBAR message is sent to the parent window of a
        /// scroll bar control when the control is about to be drawn. By
        /// responding to this message; the parent window can use the display
        /// context handle to set the background color of the scroll bar
        /// control.
        /// </summary>
        public const Int32 CTLCOLORSCROLLBAR = 0x0137;

        /// <summary>
        /// A static control; or an edit control that is read-only or disabled;
        /// sends the WM_CTLCOLORSTATIC message to its parent window when the
        /// control is about to be drawn. By responding to this message; the
        /// parent window can use the specified device context handle to set the
        /// text and background colors of the static control.
        /// </summary>
        public const Int32 CTLCOLORSTATIC = 0x0138;

        /// <summary>
        /// Use WM_MOUSEFIRST to specify the first mouse message. Use the
        /// PeekMessage() Function.
        /// </summary>
        public const Int32 MOUSEFIRST = 0x0200;

        /// <summary>
        /// The WM_MOUSEMOVE message is posted to a window when the cursor
        /// moves. If the mouse is not captured; the message is posted to the
        /// window that contains the cursor. Otherwise; the message is posted to
        /// the window that has captured the mouse.
        /// </summary>
        public const Int32 MOUSEMOVE = 0x0200;

        /// <summary>
        /// The WM_LBUTTONDOWN message is posted when the user presses the left
        /// mouse button while the cursor is in the client area of a window. If
        /// the mouse is not captured; the message is posted to the window
        /// beneath the cursor. Otherwise; the message is posted to the window
        /// that has captured the mouse.
        /// </summary>
        public const Int32 LBUTTONDOWN = 0x0201;

        /// <summary>
        /// The WM_LBUTTONUP message is posted when the user releases the left
        /// mouse button while the cursor is in the client area of a window. If
        /// the mouse is not captured; the message is posted to the window
        /// beneath the cursor. Otherwise; the message is posted to the window
        /// that has captured the mouse.
        /// </summary>
        public const Int32 LBUTTONUP = 0x0202;

        /// <summary>
        /// The WM_LBUTTONDBLCLK message is posted when the user double-clicks
        /// the left mouse button while the cursor is in the client area of a
        /// window. If the mouse is not captured; the message is posted to the
        /// window beneath the cursor. Otherwise; the message is posted to the
        /// window that has captured the mouse.
        /// </summary>
        public const Int32 LBUTTONDBLCLK = 0x0203;

        /// <summary>
        /// The WM_RBUTTONDOWN message is posted when the user presses the right
        /// mouse button while the cursor is in the client area of a window. If
        /// the mouse is not captured; the message is posted to the window
        /// beneath the cursor. Otherwise; the message is posted to the window
        /// that has captured the mouse.
        /// </summary>
        public const Int32 RBUTTONDOWN = 0x0204;

        /// <summary>
        /// The WM_RBUTTONUP message is posted when the user releases the right
        /// mouse button while the cursor is in the client area of a window. If
        /// the mouse is not captured; the message is posted to the window
        /// beneath the cursor. Otherwise; the message is posted to the window
        /// that has captured the mouse.
        /// </summary>
        public const Int32 RBUTTONUP = 0x0205;

        /// <summary>
        /// The WM_RBUTTONDBLCLK message is posted when the user double-clicks
        /// the right mouse button while the cursor is in the client area of a
        /// window. If the mouse is not captured; the message is posted to the
        /// window beneath the cursor. Otherwise; the message is posted to the
        /// window that has captured the mouse.
        /// </summary>
        public const Int32 RBUTTONDBLCLK = 0x0206;

        /// <summary>
        /// The WM_MBUTTONDOWN message is posted when the user presses the
        /// middle mouse button while the cursor is in the client area of a
        /// window. If the mouse is not captured; the message is posted to the
        /// window beneath the cursor. Otherwise; the message is posted to the
        /// window that has captured the mouse.
        /// </summary>
        public const Int32 MBUTTONDOWN = 0x0207;

        /// <summary>
        /// The WM_MBUTTONUP message is posted when the user releases the middle
        /// mouse button while the cursor is in the client area of a window. If
        /// the mouse is not captured; the message is posted to the window
        /// beneath the cursor. Otherwise; the message is posted to the window
        /// that has captured the mouse.
        /// </summary>
        public const Int32 MBUTTONUP = 0x0208;

        /// <summary>
        /// The WM_MBUTTONDBLCLK message is posted when the user double-clicks
        /// the middle mouse button while the cursor is in the client area of a
        /// window. If the mouse is not captured; the message is posted to the
        /// window beneath the cursor. Otherwise; the message is posted to the
        /// window that has captured the mouse.
        /// </summary>
        public const Int32 MBUTTONDBLCLK = 0x0209;

        /// <summary>
        /// The WM_MOUSEWHEEL message is sent to the focus window when the mouse
        /// wheel is rotated. The DefWindowProc function propagates the message
        /// to the window's parent. There should be no internal forwarding of
        /// the message; since DefWindowProc propagates it up the parent chain
        /// until it finds a window that processes it.
        /// </summary>
        public const Int32 MOUSEWHEEL = 0x020A;

        /// <summary>
        /// The WM_XBUTTONDOWN message is posted when the user presses the first
        /// or second X button while the cursor is in the client area of a
        /// window. If the mouse is not captured; the message is posted to the
        /// window beneath the cursor. Otherwise; the message is posted to the
        /// window that has captured the mouse.
        /// </summary>
        public const Int32 XBUTTONDOWN = 0x020B;

        /// <summary>
        /// The WM_XBUTTONUP message is posted when the user releases the first
        /// or second X button while the cursor is in the client area of a
        /// window. If the mouse is not captured; the message is posted to the
        /// window beneath the cursor. Otherwise; the message is posted to the
        /// window that has captured the mouse.
        /// </summary>
        public const Int32 XBUTTONUP = 0x020C;

        /// <summary>
        /// The WM_XBUTTONDBLCLK message is posted when the user double-clicks
        /// the first or second X button while the cursor is in the client area
        /// of a window. If the mouse is not captured; the message is posted to
        /// the window beneath the cursor. Otherwise; the message is posted to
        /// the window that has captured the mouse.
        /// </summary>
        public const Int32 XBUTTONDBLCLK = 0x020D;

        /// <summary>
        /// The WM_MOUSEHWHEEL message is sent to the focus window when the
        /// mouse's horizontal scroll wheel is tilted or rotated. The
        /// DefWindowProc function propagates the message to the window's
        /// parent. There should be no internal forwarding of the message; since
        /// DefWindowProc propagates it up the parent chain until it finds a
        /// window that processes it.
        /// </summary>
        public const Int32 MOUSEHWHEEL = 0x020E;

        /// <summary>
        /// Use WM_MOUSELAST to specify the last mouse message. Used with
        /// PeekMessage() Function.
        /// </summary>
        public const Int32 MOUSELAST = 0x020E;

        /// <summary>
        /// The WM_PARENTNOTIFY message is sent to the parent of a child window
        /// when the child window is created or destroyed; or when the user
        /// clicks a mouse button while the cursor is over the child window.
        /// When the child window is being created; the system sends
        /// WM_PARENTNOTIFY just before the CreateWindow or CreateWindowEx
        /// function that creates the window returns. When the child window is
        /// being destroyed; the system sends the message before any processing
        /// to destroy the window takes place.
        /// </summary>
        public const Int32 PARENTNOTIFY = 0x0210;

        /// <summary>
        /// The WM_ENTERMENULOOP message informs an application's main window
        /// procedure that a menu modal loop has been entered.
        /// </summary>
        public const Int32 ENTERMENULOOP = 0x0211;

        /// <summary>
        /// The WM_EXITMENULOOP message informs an application's main window
        /// procedure that a menu modal loop has been exited.
        /// </summary>
        public const Int32 EXITMENULOOP = 0x0212;

        /// <summary>
        /// The WM_NEXTMENU message is sent to an application when the right or
        /// left arrow key is used to switch between the menu bar and the system
        /// menu.
        /// </summary>
        public const Int32 NEXTMENU = 0x0213;

        /// <summary>
        /// The WM_SIZING message is sent to a window that the user is resizing.
        /// By processing this message; an application can monitor the size and
        /// position of the drag rectangle and; if needed; change its size or
        /// position.
        /// </summary>
        public const Int32 SIZING = 0x0214;

        /// <summary>
        /// The WM_CAPTURECHANGED message is sent to the window that is losing
        /// the mouse capture.
        /// </summary>
        public const Int32 CAPTURECHANGED = 0x0215;

        /// <summary>
        /// The WM_MOVING message is sent to a window that the user is moving.
        /// By processing this message; an application can monitor the position
        /// of the drag rectangle and; if needed; change its position.
        /// </summary>
        public const Int32 MOVING = 0x0216;

        /// <summary>
        /// Notifies applications that a power-management event has occurred.
        /// </summary>
        public const Int32 POWERBROADCAST = 0x0218;

        /// <summary>
        /// Notifies an application of a change to the hardware configuration of
        /// a device or the computer.
        /// </summary>
        public const Int32 DEVICECHANGE = 0x0219;

        /// <summary>
        /// An application sends the WM_MDICREATE message to a multiple-document
        /// interface (MDI) client window to create an MDI child window.
        /// </summary>
        public const Int32 MDICREATE = 0x0220;

        /// <summary>
        /// An application sends the WM_MDIDESTROY message to a
        /// multiple-document interface (MDI) client window to close an MDI
        /// child window.
        /// </summary>
        public const Int32 MDIDESTROY = 0x0221;

        /// <summary>
        /// An application sends the WM_MDIACTIVATE message to a
        /// multiple-document interface (MDI) client window to instruct the
        /// client window to activate a different MDI child window.
        /// </summary>
        public const Int32 MDIACTIVATE = 0x0222;

        /// <summary>
        /// An application sends the WM_MDIRESTORE message to a
        /// multiple-document interface (MDI) client window to restore an MDI
        /// child window from maximized or minimized size.
        /// </summary>
        public const Int32 MDIRESTORE = 0x0223;

        /// <summary>
        /// An application sends the WM_MDINEXT message to a multiple-document
        /// interface (MDI) client window to activate the next or previous child
        /// window.
        /// </summary>
        public const Int32 MDINEXT = 0x0224;

        /// <summary>
        /// An application sends the WM_MDIMAXIMIZE message to a
        /// multiple-document interface (MDI) client window to maximize an MDI
        /// child window. The system resizes the child window to make its client
        /// area fill the client window. The system places the child window's
        /// window menu icon in the rightmost position of the frame window's
        /// menu bar; and places the child window's restore icon in the leftmost
        /// position. The system also appends the title bar text of the child
        /// window to that of the frame window.
        /// </summary>
        public const Int32 MDIMAXIMIZE = 0x0225;

        /// <summary>
        /// An application sends the WM_MDITILE message to a multiple-document
        /// interface (MDI) client window to arrange all of its MDI child
        /// windows in a tile format.
        /// </summary>
        public const Int32 MDITILE = 0x0226;

        /// <summary>
        /// An application sends the WM_MDICASCADE message to a
        /// multiple-document interface (MDI) client window to arrange all its
        /// child windows in a cascade format.
        /// </summary>
        public const Int32 MDICASCADE = 0x0227;

        /// <summary>
        /// An application sends the WM_MDIICONARRANGE message to a
        /// multiple-document interface (MDI) client window to arrange all
        /// minimized MDI child windows. It does not affect child windows that
        /// are not minimized.
        /// </summary>
        public const Int32 MDIICONARRANGE = 0x0228;

        /// <summary>
        /// An application sends the WM_MDIGETACTIVE message to a
        /// multiple-document interface (MDI) client window to retrieve the
        /// handle to the active MDI child window.
        /// </summary>
        public const Int32 MDIGETACTIVE = 0x0229;

        /// <summary>
        /// An application sends the WM_MDISETMENU message to a
        /// multiple-document interface (MDI) client window to replace the
        /// entire menu of an MDI frame window; to replace the window menu of
        /// the frame window; or both.
        /// </summary>
        public const Int32 MDISETMENU = 0x0230;

        /// <summary>
        /// The WM_ENTERSIZEMOVE message is sent one time to a window after it
        /// enters the moving or sizing modal loop. The window enters the moving
        /// or sizing modal loop when the user clicks the window's title bar or
        /// sizing border; or when the window passes the WM_SYSCOMMAND message
        /// to the DefWindowProc function and the wParam parameter of the
        /// message specifies the SC_MOVE or SC_SIZE value. The operation is
        /// complete when DefWindowProc returns.
        /// The system sends the WM_ENTERSIZEMOVE message regardless of whether
        /// the dragging of full windows is enabled.
        /// </summary>
        public const Int32 ENTERSIZEMOVE = 0x0231;

        /// <summary>
        /// The WM_EXITSIZEMOVE message is sent one time to a window; after it
        /// has exited the moving or sizing modal loop. The window enters the
        /// moving or sizing modal loop when the user clicks the window's title
        /// bar or sizing border; or when the window passes the WM_SYSCOMMAND
        /// message to the DefWindowProc function and the wParam parameter of
        /// the message specifies the SC_MOVE or SC_SIZE value. The operation is
        /// complete when DefWindowProc returns.
        /// </summary>
        public const Int32 EXITSIZEMOVE = 0x0232;

        /// <summary>
        /// Sent when the user drops a file on the window of an application that
        /// has registered itself as a recipient of dropped files.
        /// </summary>
        public const Int32 DROPFILES = 0x0233;

        /// <summary>
        /// An application sends the WM_MDIREFRESHMENU message to a
        /// multiple-document interface (MDI) client window to refresh the
        /// window menu of the MDI frame window.
        /// </summary>
        public const Int32 MDIREFRESHMENU = 0x0234;

        /// <summary>
        /// Sent to an application when a window is activated. A window receives
        /// this message through its WindowProc function.
        /// </summary>
        public const Int32 IME_SETCONTEXT = 0x0281;

        /// <summary>
        /// Sent to an application to notify it of changes to the IME window. A
        /// window receives this message through its WindowProc function.
        /// </summary>
        public const Int32 IME_NOTIFY = 0x0282;

        /// <summary>
        /// Sent by an application to direct the IME window to carry out the
        /// requested command. The application uses this message to control the
        /// IME window that it has created. To send this message; the
        /// application calls the SendMessage function with the following
        /// parameters.
        /// </summary>
        public const Int32 IME_CONTROL = 0x0283;

        /// <summary>
        /// Sent to an application when the IME window finds no space to extend
        /// the area for the composition window. A window receives this message
        /// through its WindowProc function.
        /// </summary>
        public const Int32 IME_COMPOSITIONFULL = 0x0284;

        /// <summary>
        /// Sent to an application when the operating system is about to change
        /// the current IME. A window receives this message through its
        /// WindowProc function.
        /// </summary>
        public const Int32 IME_SELECT = 0x0285;

        /// <summary>
        /// Sent to an application when the IME gets a character of the
        /// conversion result. A window receives this message through its
        /// WindowProc function.
        /// </summary>
        public const Int32 IME_CHAR = 0x0286;

        /// <summary>
        /// Sent to an application to provide commands and request information.
        /// A window receives this message through its WindowProc function.
        /// </summary>
        public const Int32 IME_REQUEST = 0x0288;

        /// <summary>
        /// Sent to an application by the IME to notify the application of a key
        /// press and to keep message order. A window receives this message
        /// through its WindowProc function.
        /// </summary>
        public const Int32 IME_KEYDOWN = 0x0290;

        /// <summary>
        /// Sent to an application by the IME to notify the application of a key
        /// release and to keep message order. A window receives this message
        /// through its WindowProc function.
        /// </summary>
        public const Int32 IME_KEYUP = 0x0291;

        /// <summary>
        /// The WM_NCMOUSEHOVER message is posted to a window when the cursor
        /// hovers over the nonclient area of the window for the period of time
        /// specified in a prior call to TrackMouseEvent.
        /// </summary>
        public const Int32 NCMOUSEHOVER = 0x02A0;

        /// <summary>
        /// The WM_MOUSEHOVER message is posted to a window when the cursor
        /// hovers over the client area of the window for the period of time
        /// specified in a prior call to TrackMouseEvent.
        /// </summary>
        public const Int32 MOUSEHOVER = 0x02A1;

        /// <summary>
        /// The WM_NCMOUSELEAVE message is posted to a window when the cursor
        /// leaves the nonclient area of the window specified in a prior call to
        /// TrackMouseEvent.
        /// </summary>
        public const Int32 NCMOUSELEAVE = 0x02A2;

        /// <summary>
        /// The WM_MOUSELEAVE message is posted to a window when the cursor
        /// leaves the client area of the window specified in a prior call to
        /// TrackMouseEvent.
        /// </summary>
        public const Int32 MOUSELEAVE = 0x02A3;

        /// <summary>
        /// The WM_WTSSESSION_CHANGE message notifies applications of changes in
        /// session state.
        /// </summary>
        public const Int32 WTSSESSION_CHANGE = 0x02B1;
        public const Int32 TABLET_FIRST = 0x02c0;
        public const Int32 TABLET_LAST = 0x02df;

        /// <summary>
        /// An application sends a WM_CUT message to an edit control or combo
        /// box to delete (cut) the current selection; if any; in the edit
        /// control and copy the deleted text to the clipboard in CF_TEXT
        /// format.
        /// </summary>
        public const Int32 CUT = 0x0300;

        /// <summary>
        /// An application sends the WM_COPY message to an edit control or combo
        /// box to copy the current selection to the clipboard in CF_TEXT
        /// format.
        /// </summary>
        public const Int32 COPY = 0x0301;

        /// <summary>
        /// An application sends a WM_PASTE message to an edit control or combo
        /// box to copy the current content of the clipboard to the edit control
        /// at the current caret position. Data is inserted only if the
        /// clipboard contains data in CF_TEXT format.
        /// </summary>
        public const Int32 PASTE = 0x0302;

        /// <summary>
        /// An application sends a WM_CLEAR message to an edit control or combo
        /// box to delete (clear) the current selection; if any; from the edit
        /// control.
        /// </summary>
        public const Int32 CLEAR = 0x0303;

        /// <summary>
        /// An application sends a WM_UNDO message to an edit control to undo
        /// the last operation. When this message is sent to an edit control;
        /// the previously deleted text is restored or the previously added text
        /// is deleted.
        /// </summary>
        public const Int32 UNDO = 0x0304;

        /// <summary>
        /// The WM_RENDERFORMAT message is sent to the clipboard owner if it has
        /// delayed rendering a specific clipboard format and if an application
        /// has requested data in that format. The clipboard owner must render
        /// data in the specified format and place it on the clipboard by
        /// calling the SetClipboardData function.
        /// </summary>
        public const Int32 RENDERFORMAT = 0x0305;

        /// <summary>
        /// The WM_RENDERALLFORMATS message is sent to the clipboard owner
        /// before it is destroyed; if the clipboard owner has delayed rendering
        /// one or more clipboard formats. For the content of the clipboard to
        /// remain available to other applications; the clipboard owner must
        /// render data in all the formats it is capable of generating; and
        /// place the data on the clipboard by calling the SetClipboardData
        /// function.
        /// </summary>
        public const Int32 RENDERALLFORMATS = 0x0306;

        /// <summary>
        /// The WM_DESTROYCLIPBOARD message is sent to the clipboard owner when
        /// a call to the EmptyClipboard function empties the clipboard.
        /// </summary>
        public const Int32 DESTROYCLIPBOARD = 0x0307;

        /// <summary>
        /// The WM_DRAWCLIPBOARD message is sent to the first window in the
        /// clipboard viewer chain when the content of the clipboard changes.
        /// This enables a clipboard viewer window to display the new content of
        /// the clipboard.
        /// </summary>
        public const Int32 DRAWCLIPBOARD = 0x0308;

        /// <summary>
        /// The WM_PAINTCLIPBOARD message is sent to the clipboard owner by a
        /// clipboard viewer window when the clipboard contains data in the
        /// CF_OWNERDISPLAY format and the clipboard viewer's client area needs
        /// repainting.
        /// </summary>
        public const Int32 PAINTCLIPBOARD = 0x0309;

        /// <summary>
        /// The WM_VSCROLLCLIPBOARD message is sent to the clipboard owner by a
        /// clipboard viewer window when the clipboard contains data in the
        /// CF_OWNERDISPLAY format and an event occurs in the clipboard viewer's
        /// vertical scroll bar. The owner should scroll the clipboard image and
        /// update the scroll bar values.
        /// </summary>
        public const Int32 VSCROLLCLIPBOARD = 0x030A;

        /// <summary>
        /// The WM_SIZECLIPBOARD message is sent to the clipboard owner by a
        /// clipboard viewer window when the clipboard contains data in the
        /// CF_OWNERDISPLAY format and the clipboard viewer's client area has
        /// changed size.
        /// </summary>
        public const Int32 SIZECLIPBOARD = 0x030B;

        /// <summary>
        /// The WM_ASKCBFORMATNAME message is sent to the clipboard owner by a
        /// clipboard viewer window to request the name of a CF_OWNERDISPLAY
        /// clipboard format.
        /// </summary>
        public const Int32 ASKCBFORMATNAME = 0x030C;

        /// <summary>
        /// The WM_CHANGECBCHAIN message is sent to the first window in the
        /// clipboard viewer chain when a window is being removed from the
        /// chain.
        /// </summary>
        public const Int32 CHANGECBCHAIN = 0x030D;

        /// <summary>
        /// The WM_HSCROLLCLIPBOARD message is sent to the clipboard owner by a
        /// clipboard viewer window. This occurs when the clipboard contains
        /// data in the CF_OWNERDISPLAY format and an event occurs in the
        /// clipboard viewer's horizontal scroll bar. The owner should scroll
        /// the clipboard image and update the scroll bar values.
        /// </summary>
        public const Int32 HSCROLLCLIPBOARD = 0x030E;

        /// <summary>
        /// This message informs a window that it is about to receive the
        /// keyboard focus; giving the window the opportunity to realize its
        /// logical palette when it receives the focus.
        /// </summary>
        public const Int32 QUERYNEWPALETTE = 0x030F;

        /// <summary>
        /// The WM_PALETTEISCHANGING message informs applications that an
        /// application is going to realize its logical palette.
        /// </summary>
        public const Int32 PALETTEISCHANGING = 0x0310;

        /// <summary>
        /// This message is sent by the OS to all top-level and overlapped
        /// windows after the window with the keyboard focus realizes its
        /// logical palette.
        /// This message enables windows that do not have the keyboard focus to
        /// realize their logical palettes and update their client areas.
        /// </summary>
        public const Int32 PALETTECHANGED = 0x0311;

        /// <summary>
        /// The WM_HOTKEY message is posted when the user presses a hot key
        /// registered by the RegisterHotKey function. The message is placed at
        /// the top of the message queue associated with the thread that
        /// registered the hot key.
        /// </summary>
        public const Int32 HOTKEY = 0x0312;

        /// <summary>
        /// The WM_PRINT message is sent to a window to request that it draw
        /// itself in the specified device context; most commonly in a printer
        /// device context.
        /// </summary>
        public const Int32 PRINT = 0x0317;

        /// <summary>
        /// The WM_PRINTCLIENT message is sent to a window to request that it
        /// draw its client area in the specified device context; most commonly
        /// in a printer device context.
        /// </summary>
        public const Int32 PRINTCLIENT = 0x0318;

        /// <summary>
        /// The WM_APPCOMMAND message notifies a window that the user generated
        /// an application command event; for example; by clicking an
        /// application command button using the mouse or typing an application
        /// command key on the keyboard.
        /// </summary>
        public const Int32 APPCOMMAND = 0x0319;

        /// <summary>
        /// The WM_THEMECHANGED message is broadcast to every window following a
        /// theme change event. Examples of theme change events are the
        /// activation of a theme; the deactivation of a theme; or a transition
        /// from one theme to another.
        /// </summary>
        public const Int32 THEMECHANGED = 0x031A;

        /// <summary>
        /// Sent when the contents of the clipboard have changed.
        /// </summary>
        public const Int32 CLIPBOARDUPDATE = 0x031D;

        /// <summary>
        /// The system will send a window the WM_DWMCOMPOSITIONCHANGED message
        /// to indicate that the availability of desktop composition has
        /// changed.
        /// </summary>
        public const Int32 DWMCOMPOSITIONCHANGED = 0x031E;

        /// <summary>
        /// WM_DWMNCRENDERINGCHANGED is called when the non-client area
        /// rendering status of a window has changed. Only windows that have set
        /// the flag DWM_BLURBEHIND.fTransitionOnMaximized to true will get this
        /// message.
        /// </summary>
        public const Int32 DWMNCRENDERINGCHANGED = 0x031F;

        /// <summary>
        /// Sent to all top-level windows when the colorization color has
        /// changed.
        /// </summary>
        public const Int32 DWMCOLORIZATIONCOLORCHANGED = 0x0320;

        /// <summary>
        /// WM_DWMWINDOWMAXIMIZEDCHANGE will let you know when a DWM composed
        /// window is maximized. You also have to register for this message as
        /// well. You'd have other windowd go opaque when this message is sent.
        /// </summary>
        public const Int32 DWMWINDOWMAXIMIZEDCHANGE = 0x0321;

        /// <summary>
        /// Sent to request extended title bar information. A window receives
        /// this message through its WindowProc function.
        /// </summary>
        public const Int32 GETTITLEBARINFOEX = 0x033F;
        public const Int32 HANDHELDFIRST = 0x0358;
        public const Int32 HANDHELDLAST = 0x035F;
        public const Int32 AFXFIRST = 0x0360;
        public const Int32 AFXLAST = 0x037F;
        public const Int32 PENWINFIRST = 0x0380;
        public const Int32 PENWINLAST = 0x038F;

        /// <summary>
        /// The WM_APP constant is used by applications to help define private
        /// messages; usually of the form WM_APP+X; where X is an integer value.
        /// </summary>
        public const Int32 APP = 0x8000;

        /// <summary>
        /// The WM_USER constant is used by applications to help define private
        /// messages for use by private window classes; usually of the form
        /// WM_USER+X; where X is an integer value.
        /// </summary>
        public const Int32 USER = 0x0400;

        /// <summary>
        /// An application sends the WM_CPL_LAUNCH message to Windows Control
        /// Panel to request that a Control Panel application be started.
        /// </summary>
        public const Int32 CPL_LAUNCH = USER + 0x1000;

        /// <summary>
        /// The WM_CPL_LAUNCHED message is sent when a Control Panel
        /// application; started by the WM_CPL_LAUNCH message; has closed. The
        /// WM_CPL_LAUNCHED message is sent to the window identified by the
        /// wParam parameter of the WM_CPL_LAUNCH message that started the
        /// application.
        /// </summary>
        public const Int32 CPL_LAUNCHED = USER + 0x1001;

        /// <summary>
        /// WM_SYSTIMER is a well-known yet still undocumented message. Windows
        /// uses WM_SYSTIMER for internal actions like scrolling.
        /// </summary>
        public const Int32 SYSTIMER = 0x118;
    }
}
