NAME

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

SYNOPSIS

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

ARGUMENTS

       - 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

DESCRIPTION

       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.

STRUCTURES

            typedef struct _XkbIndicatorChanges {
                unsigned int          state_changes;
                unsigned int           map_changes;
            }XkbIndicatorChangesRec,*XkbIndicatorChangesPtr;

       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;

DIAGNOSTICS

       BadAtom        A name is neither a valid Atom or None

       BadImplementation
                      Invalid reply from server

SEE ALSO

       XkbIndicatorMapNotify(3), XkbIndicatorStateNotify(3)