NAME

       XkbGetIndicatorChanges  - Updates a local copy of the keyboard description with the actual
       values of one or more calls to XkbNoteIndicatorChanges

SYNOPSIS

       Status  XkbGetIndicatorChanges  (Display  *dpy,  XkbDescPtr  xkb,   XkbIndicatorChangesPtr
              changes, unsigned int state);

ARGUMENTS

       - dpy  connection to the X server

       - xkb  keyboard description to hold the new values

       - changes
              indicator maps/state to be obtained from the server

       - state
              backfilled with the state of the indicators

DESCRIPTION

       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.

       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;

       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.

       When   your   client  application  receives  either  a  XkbIndicatorStateNotify  event  or
       XkbIndicatorMapNotify event, you can note the changes in a changes  structure  by  calling
       XkbNoteIndicatorChanges.

       XkbGetIndicatorChanges   examines   the   changes  parameter,  pulls  over  the  necessary
       information from the server, and copies the results into the xkb keyboard description.  If
       any bits are set in the state_changes field of changes, XkbGetIndicatorChanges also places
       the state of those indicators  in  state.   If  the  indicators  field  of  xkb  is  NULL,
       XkbGetIndicatorChanges  allocates  and  initializes  it. To free the indicators field, use
       XkbFreeIndicators.

DIAGNOSTICS

       BadAlloc       Unable to allocate storage

       BadImplementation
                      Invalid reply from server

       BadMatch       A compatible version of Xkb was not available in the server or an  argument
                      has correct type and range, but is otherwise invalid

SEE ALSO

       XkbFreeIndicators(3),        XkbGetIndicatorChanges(3),        XkbNoteIndicatorChanges(3),
       XkbSelectEvents(3), XkbSelectEventDetail(3)