/// <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)
{
return(CallNextHookEx(mouseHookHandle, nCode, wParam, lParam));
}
//Marshall the data from callback.
var info = (MouseLLHookStruct)Marshal.PtrToStructure(lParam, typeof(MouseLLHookStruct));
ushort subCode;
switch (wParam)
{
case WM_LBUTTONDOWN:
MouseState.AddPressedElement(MouseKeyCode.LeftButton);
break;
case WM_LBUTTONUP:
MouseState.RemovePressedElement(MouseKeyCode.LeftButton, PressHold);
break;
case WM_RBUTTONDOWN:
MouseState.AddPressedElement(MouseKeyCode.RightButton);
break;
case WM_RBUTTONUP:
MouseState.RemovePressedElement(MouseKeyCode.RightButton, PressHold);
break;
case WM_MBUTTONDOWN:
MouseState.AddPressedElement(MouseKeyCode.MiddleButton);
break;
case WM_MBUTTONUP:
MouseState.RemovePressedElement(MouseKeyCode.MiddleButton, PressHold);
break;
case WM_MOUSEWHEEL:
subCode = HiWord(info.MouseData);
if (subCode == 120)
{
MouseState.AddScrollDirection(MouseScrollKeyCode.ScrollUp);
}
if (subCode == 65416)
{
MouseState.AddScrollDirection(MouseScrollKeyCode.ScrollDown);
}
break;
case WM_MOUSEHWHEEL:
subCode = HiWord(info.MouseData);
if (subCode == 120)
{
MouseState.AddScrollDirection(MouseScrollKeyCode.ScrollRight);
}
if (subCode == 65416)
{
MouseState.AddScrollDirection(MouseScrollKeyCode.ScrollLeft);
}
break;
case WM_XBUTTONDOWN:
subCode = HiWord(info.MouseData);
if (subCode == XBUTTON1)
{
MouseState.AddPressedElement(MouseKeyCode.X1Button);
}
if (subCode == XBUTTON2)
{
MouseState.AddPressedElement(MouseKeyCode.X2Button);
}
break;
case WM_XBUTTONUP:
subCode = HiWord(info.MouseData);
if (subCode == XBUTTON1)
{
MouseState.RemovePressedElement(MouseKeyCode.X1Button, PressHold);
}
if (subCode == XBUTTON2)
{
MouseState.RemovePressedElement(MouseKeyCode.X2Button, PressHold);
}
break;
case WM_MOUSEMOVE:
MouseState.RegisterLocation(new System.Drawing.Point(info.Point.X, info.Point.Y), info.Time);
break;
}
if (trapEnabled && TrapMouse)
{
return(1);
}
return(CallNextHookEx(mouseHookHandle, nCode, wParam, lParam));
}