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XkbSelectEventDetails(3)


NAME

   XkbSelectEventDetails  -  Selects or deselects for a specific Xkb event
   and optionally places conditions  on  when  events  of  that  type  are
   reported to your client

SYNOPSIS

   Bool XkbSelectEventDetails (Display *display, unsigned int device_spec,
          unsigned  int  event_type,  unsigned  long  int  bits_to_change,
          unsigned long int values_for_bits);

ARGUMENTS

   display
          connection to the X server

   device_spec
          device ID, or XkbUseCoreKbd

   event_type
          Xkb event type of interest

   bits_to_change
          determines events to be selected / deselected

   values_for_bits
          1=>select, 0->deselect; for events in bits_to_change

DESCRIPTION

   Xkb  events  are  selected using an event mask, much the same as normal
   core X events are selected. However, unlike selecting  core  X  events,
   where  you  must  specify  the  selection  status  (on  or off) for all
   possible event types whenever you wish to change the selection criteria
   for any one event, Xkb allows you to restrict the specification to only
   the event types you wish to change. This means that you do not need  to
   remember  the  event  selection values for all possible types each time
   you want to change one of them.

   Many  Xkb  event  types   are   generated   under   several   different
   circumstances.  When selecting to receive an Xkb event, you may specify
   either that you want it delivered under all circumstances, or that  you
   want it delivered only for a subset of the possible circumstances.

   You  can  also deselect an event type that was previously selected for,
   using the same granularity.

   Xkb provides two functions to  select  and  deselect  delivery  of  Xkb
   events.   XkbSelectEvents  allows you to select or deselect delivery of
   more  than  one  Xkb  event  type  at  once.  Events   selected   using
   XkbSelectEvents  are  delivered to your program under all circumstances
   that generate the events.  To restrict delivery of an event to a subset
   of  the  conditions  under  which it occurs, use XkbSelectEventDetails.
   XkbSelectEventDetails  only  allows  you  to   change   the   selection
   conditions  for  a  single  event at a time, but it provides a means of
   fine-tuning the conditions under which the event is delivered.

   To select or deselect for a specific Xkb  event  and  optionally  place
   conditions on when events of that type are reported to your client, use
   XkbSelectEventDetails.  This allows you to exercise a finer granularity
   of control over delivery of Xkb events with XkbSelectEvents.

   While   XkbSelectEvents   allows   multiple   events  to  be  selected,
   XkbSelectEventDetails changes the selection criteria for a single  type
   of   Xkb   event.   The   interpretation   of  the  bits_to_change  and
   values_for_bits masks depends on the event type in question.

   XkbSelectEventDetails changes the Xkb  event  selection  mask  for  the
   keyboard  specified  by  device_spec  and  the  Xkb  event specified by
   event_type.  To turn on event selection for an event  detail,  set  the
   bit  for  the  detail  in  the  bits_to_change  parameter  and  set the
   corresponding bit in the values_for_bits parameter. To turn  off  event
   detail  selection  for  a  detail,  set  the  bit for the detail in the
   bits_to_change parameter and do not set the corresponding  bit  in  the
   values_for_bits parameter.

   If  an  invalid  event  type  is  specified,  a BadValue protocol error
   results. If a bit is not set in the bits_to_change parameter,  but  the
   corresponding  bit  is set in the values_for_bits parameter, a BadMatch
   protocol error results. If an  undefined  bit  is  set  in  either  the
   bits_to_change  or  the  values_for_bits parameter, a BadValue protocol
   error results.

   For each type of Xkb event,  the  legal  event  details  that  you  can
   specify in the XkbSelectEventDetails request are listed in the chapters
   that describe each event in detail.

DIAGNOSTICS

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

   BadValue       An argument is out of range

SEE ALSO

   XkbSelectEvents(3), XkbUseCoreKbd(3)



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