问如何在alt-tab键切换后恢复ClipCursor约束

EN

case WM_SETCURSOR:
{
    if (mIsMouseGrabOn)  // a bool that indicates if the mouse should be restricted to the cient area or not
        SetCursor(gmInstance->m_cursorTargetGreen);
    else
        SetCursor(gmInstance->m_cursorTargetRed);
    return 0; // prevent DefWndProc from resetting it
}

case WM_ACTIVATEAPP:
{
    if(wParam == TRUE) // When we are activated
    { 
        if (mIsMouseGrabOn)
            GrabMouse(); // function to determine client area and call ClipCusor with the results
        else
            ClipCusor(NULL); // make the sure cursor is freed
    }
    else if(wParam == FALSE) // When we are deactivated
    {
        ClipCursor(NULL);
    }
    //return 0; // Let DefWndProc handle anything else
}