glutButtonBoxFunc  -  sets  the  dial  & button box button
       callback for the current window.

SYNTAX

       void glutButtonBoxFunc(void (*func)(int button, int state));

ARGUMENTS

       func      The new button box callback function.

DESCRIPTION

       glutButtonBoxFunc sets the dial & button box button  call-
       back  for the current window. The dial & button box button
       callback for a window is called when the window has dial &
       button box input focus (normally, when the mouse is in the
       window) and the user generates dial &  button  box  button
       presses.  The  button  parameter will be the button number
       (starting at one). The number of available dial  &  button
       box    buttons    can    be    determined   with   glutDe-
       viceGet(GLUT_NUM_BUTTON_BOX_BUTTONS). The state is  either
       GLUT_UP  or  GLUT_DOWN indicating whether the callback was
       due to a release or press respectively.

       Registering a dial & button box  button  callback  when  a
       dial  &  button box device is not available is ineffectual
       and not an error. In this case, no dial & button box  but-
       ton callbacks will be generated.

       Passing  NULL to glutButtonBoxFunc disables the generation
       of dial & button box button callbacks. When a  new  window
       is  created,  no dial & button box button callback is ini-
       tially registered.

SEE ALSO

       glutDialsFunc, glutDeviceGet, glutSpaceballButtonFunc,
       glutTabletButtonFunc

AUTHOR

       Mark J. Kilgard (mjk@nvidia.com)