XkbChangeIndicators  -  Changes indicator maps or state without passing
   the entire keyboard description


   Bool    XkbChangeIndicators    (Display    *dpy,    XkbDescPtr     xkb,
          XkbIndicatorChangesPtr changes, unsigned int state);


   - dpy  connection to the X server

   - xkb  keyboard description from which names are to be taken.

   - changes
          indicators to be updated on the server

   - state
          new state of indicators listed in changes->state_changes


   The   XkbIndicatorChangesRec  identifies  small  modifications  to  the
   indicator map.  Use it with the function XkbChangeIndicators to  reduce
   the amount of traffic sent to the server (see STRUCTURES).

   The  state_changes  field  is a mask that specifies the indicators that
   have changed state, and  map_changes  is  a  mask  that  specifies  the
   indicators whose maps have changed.

   XkbChangeIndicators  copies  any  maps  specified  by  changes from the
   keyboard description, xkb, to the server specified by dpy.  If any bits
   are set in the state_changes field of changes, XkbChangeIndicators also
   sets the state of those indicators to the values specified in the state
   mask.  A  1  bit in state turns the corresponding indicator on, a 0 bit
   turns it off.

   In  addition,  it  can  also   generate   XkbIndicatorStateNotify   and
   XkbIndicatorMapNotify events.

   Whenever    an    indicator    changes    state,   the   server   sends
   XkbIndicatorStateNotify events to all  interested  clients.  Similarly,
   whenever    an    indicator's    map    changes,   the   server   sends
   XkbIndicatorMapNotify events to all interested clients.

   To receive XkbIndicatorStateNotify  events,  use  XkbSelectEvents  with
   both  the  bits_to_change  and  values_for_bits  parameters  containing
   XkbIndicatorStateNotifyMask. To receive  XkbIndicatorMapNotify  events,
   use XkbSelectEvents with XkbIndicatorMapNotifyMask.

   To    receive    events    for    only    specific    indicators,   use
   XkbSelectEventDetails.     Set    the    event_type    parameter     to
   XkbIndicatorStateNotify  or  XkbIndicatorMapNotify,  and  set  both the
   bits_to_change and values_for_bits detail parameters to  a  mask  where
   each  bit  specifies  one indicator, turning on those bits that specify
   the indicators for which you want to receive events.

   xkb_type is either  XkbIndicatorStateNotify  or  XkbIndicatorMapNotify,
   depending  on  whether  the  event is a kbIndicatorStateNotify event or
   kbIndicatorMapNotify event.

   The changed parameter is a mask that is the bitwise inclusive OR of the
   indicators   that   have   changed.   If   the   event   is   of   type
   XkbIndicatorMapNotify, changed reports the maps that  changed.  If  the
   event   is   of   type  XkbIndicatorStateNotify,  changed  reports  the
   indicators that have changed state.  state is a mask that specifies the
   current  state of all indicators, whether they have changed or not, for
   both XkbIndicatorStateNotify and IndicatorMapNotify events.


        typedef struct _XkbIndicatorChanges {
            unsigned int          state_changes;
            unsigned int           map_changes;

   Both types of indicator events use the same structure:

       typedef struct _XkbIndicatorNotify {
           int            type;        / Xkb extension base event code */
           unsigned long  serial;      / X server serial number for event */
           Bool           send_event;  / True => synthetically generated */
           Display *      display;     / server connection where event generated */
           Time           time;        / server time when event generated */
           int            xkb_type;    / specifies state or map notify */
           int            device;      / Xkb device ID, will not be XkbUseCoreKbd*/
           unsigned int   changed;     / mask of indicators with new state or map */
           unsigned int   state;       / current state of all indicators */
       } XkbIndicatorNotifyEvent;


   BadAtom        A name is neither a valid Atom or None

                  Invalid reply from server


   XkbIndicatorMapNotify(3), XkbIndicatorStateNotify(3)


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