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       XkbNoteIndicatorChanges - Notes the changes in a changes structure


       void  XkbNoteIndicatorChanges  (XkbIndicatorChangesPtr  old, XkbIndicatorNotifyEvent *new,
              unsigned int wanted);


       - old  XkbIndicatorChanges structure to be updated

       - new  event from which changes are to be copied

       - wanted
              which changes are to be noted


       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.

       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

       The   wanted   parameter   is   the   bitwise  inclusive  OR  of  XkbIndicatorMapMask  and
       XkbIndicatorStateMask.  XkbNoteIndicatorChanges copies any changes  reported  in  new  and
       specified in wanted into the changes record specified by old.


       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.


       XkbIndicatorMapMask(3),        XkbIndicatorStateMask(3),         XkbSelectEventDetails(3),