예제 #1
0
        /// <summary>
        /// A callback function which will be called every Time a mouse activity detected.
        /// </summary>
        /// <param name="nCode">
        /// [in] Specifies whether the hook procedure must process the message.
        /// If nCode is HC_ACTION, the hook procedure must process the message.
        /// If nCode is less than zero, the hook procedure must pass the message to the
        /// CallNextHookEx function without further processing and must return the
        /// value returned by CallNextHookEx.
        /// </param>
        /// <param name="wParam">
        /// [in] Specifies whether the message was sent by the current thread.
        /// If the message was sent by the current thread, it is nonzero; otherwise, it is zero.
        /// </param>
        /// <param name="lParam">
        /// [in] Pointer to a CWPSTRUCT structure that contains details about the message.
        /// </param>
        /// <returns>
        /// If nCode is less than zero, the hook procedure must return the value returned by CallNextHookEx.
        /// If nCode is greater than or equal to zero, it is highly recommended that you call CallNextHookEx
        /// and return the value it returns; otherwise, other applications that have installed WH_CALLWNDPROC
        /// hooks will not receive hook notifications and may behave incorrectly as a result. If the hook
        /// procedure does not call CallNextHookEx, the return value should be zero.
        /// </returns>
        private static int MouseHookProc(int nCode, int wParam, IntPtr lParam)
        {
            if (nCode >= 0)
            {
                //Marshall the data from callback.
                MouseLLHookStruct mouseHookStruct = (MouseLLHookStruct)Marshal.PtrToStructure(lParam, typeof(MouseLLHookStruct));

                //detect button clicked
                MouseButtons button     = MouseButtons.None;
                short        mouseDelta = 0;
                int          clickCount = 0;
                bool         mouseDown  = false;
                bool         mouseUp    = false;

                switch (wParam)
                {
                case WM_LBUTTONDOWN:
                    mouseDown  = true;
                    button     = MouseButtons.Left;
                    clickCount = 1;
                    break;

                case WM_LBUTTONUP:
                    mouseUp    = true;
                    button     = MouseButtons.Left;
                    clickCount = 1;
                    break;

                case WM_LBUTTONDBLCLK:
                    button     = MouseButtons.Left;
                    clickCount = 2;
                    break;

                case WM_RBUTTONDOWN:
                    mouseDown  = true;
                    button     = MouseButtons.Right;
                    clickCount = 1;
                    break;

                case WM_RBUTTONUP:
                    mouseUp    = true;
                    button     = MouseButtons.Right;
                    clickCount = 1;
                    break;

                case WM_RBUTTONDBLCLK:
                    button     = MouseButtons.Right;
                    clickCount = 2;
                    break;

                case WM_MOUSEWHEEL:
                    //If the message is WM_MOUSEWHEEL, the high-order word of MouseData member is the wheel delta.
                    //One wheel click is defined as WHEEL_DELTA, which is 120.
                    //(value >> 16) & 0xffff; retrieves the high-order word from the given 32-bit value
                    mouseDelta = (short)((mouseHookStruct.MouseData >> 16) & 0xffff);

                    //TODO: X BUTTONS (I havent them so was unable to test)
                    //If the message is WM_XBUTTONDOWN, WM_XBUTTONUP, WM_XBUTTONDBLCLK, WM_NCXBUTTONDOWN, WM_NCXBUTTONUP,
                    //or WM_NCXBUTTONDBLCLK, the high-order word specifies which X button was pressed or released,
                    //and the low-order word is reserved. This value can be one or more of the following values.
                    //Otherwise, MouseData is not used.
                    break;
                }

                //generate event
                MouseEventExtArgs e = new MouseEventExtArgs(
                    button,
                    clickCount,
                    mouseHookStruct.Point.X,
                    mouseHookStruct.Point.Y,
                    mouseDelta);

                //Mouse up
                if (s_MouseUp != null && mouseUp)
                {
                    s_MouseUp.Invoke(null, e);
                }

                //Mouse down
                if (s_MouseDown != null && mouseDown)
                {
                    s_MouseDown.Invoke(null, e);
                }

                //If someone listens to click and a click is heppened
                if (s_MouseClick != null && clickCount > 0)
                {
                    s_MouseClick.Invoke(null, e);
                }

                //If someone listens to click and a click is heppened
                if (s_MouseClickExt != null && clickCount > 0)
                {
                    s_MouseClickExt.Invoke(null, e);
                }

                //If someone listens to double click and a click is heppened
                if (s_MouseDoubleClick != null && clickCount == 2)
                {
                    s_MouseDoubleClick.Invoke(null, e);
                }

                //Wheel was moved
                if (s_MouseWheel != null && mouseDelta != 0)
                {
                    s_MouseWheel.Invoke(null, e);
                }

                //If someone listens to move and there was a change in coordinates raise move event
                if ((s_MouseMove != null || s_MouseMoveExt != null) && (m_OldX != mouseHookStruct.Point.X || m_OldY != mouseHookStruct.Point.Y))
                {
                    m_OldX = mouseHookStruct.Point.X;
                    m_OldY = mouseHookStruct.Point.Y;
                    if (s_MouseMove != null)
                    {
                        s_MouseMove.Invoke(null, e);
                    }

                    if (s_MouseMoveExt != null)
                    {
                        s_MouseMoveExt.Invoke(null, e);
                    }
                }

                if (e.Handled)
                {
                    return(-1);
                }
            }

            //call next hook
            return(CallNextHookEx(s_MouseHookHandle, nCode, wParam, lParam));
        }