XkbListComponents(3)


NAME

   XkbListComponents - List of components for one or more component types

SYNOPSIS

   XkbComponentListPtr   XkbListComponents  (Display  *dpy,  unsigned  int
          device_spec, XkbComponentNamesPtr ptrns, int *max_inout);

ARGUMENTS

   - dpy  connection to X server

   - device_spec
          device ID, or XkbUseCoreKbd

   - ptrns
          namelist for components of interest

   - max_inout
          max # returned names, # left over

DESCRIPTION

   You may ask the server for  a  list  of  components  for  one  or  more
   component  types.  The request takes the form of a set of patterns, one
   pattern for each of the component types, including a  pattern  for  the
   complete    keyboard    description.   To   obtain   this   list,   use
   XkbListComponents.

   XkbListComponents queries the server for  a  list  of  component  names
   matching  the  patterns  specified  in ptrns.  It waits for a reply and
   returns  the  matching  component  names  in   an   XkbComponentListRec
   structure.   When  you are done using the structure, you should free it
   using XkbFreeComponentList. device_spec indicates a  particular  device
   in  which  the  caller  is  interested.  A  server  is allowed (but not
   required) to restrict its reply to portions of the  database  that  are
   relevant for that particular device.

   ptrns  is  a  pointer to an XkbComponentNamesRec. Each of the fields in
   ptrns contains a pattern naming the components of interest. Each of the
   patterns  is  composed  of characters from the ISO Latin1 encoding, but
   can contain only parentheses, the wildcard characters `?' and `*',  and
   characters permitted in a component class or member name. A pattern may
   be NULL, in which case no components for that type is returned. Pattern
   matches  with  component  names  are  case sensitive. The `?'  wildcard
   matches any single character, except a left or right  parenthesis;  the
   `*'  wildcard  matches any number of characters, except a left or right
   parenthesis. If an implementation allows  additional  characters  in  a
   component  class  or  member  name other than those required by the Xkb
   extension, the result of comparing one of the additional characters  to
   either of the wildcard characters is implementation-dependent.

   If  a  pattern  contains illegal characters, the illegal characters are
   ignored. The  matching  process  is  carried  out  as  if  the  illegal
   characters were omitted from the pattern.

   max_inout is used to throttle the amount of data passed to and from the
   server. On input, it specifies  the  maximum  number  of  names  to  be
   returned  (the total number of names in all component categories). Upon
   return from XkbListComponents, max_inout contains the number  of  names
   that matched the request but were not returned because of the limit.

   Component Names

   Component  names  have  the  form class(member) where class describes a
   subset of the available  components  for  a  particular  type  and  the
   optional  member  identifies a specific component from that subset. For
   example, the  name  "atlantis(acme)"  for  a  symbols  component  might
   specify  the  symbols used for the atlantis national keyboard layout by
   the vendor  "acme."  Each  class  has  an  optional  default  member  -
   references  that  specify a class but not a member refer to the default
   member of the class, if one exists. Xkb places no  constraints  on  the
   interpretation of the class and member names used in component names.

   The class and member names are both specified using characters from the
   Latin-1 character set. Xkb implementations must accept all alphanumeric
   characters,  minus (`-') and underscore (`_') in class or member names,
   and must not accept parentheses,  plus,  vertical  bar,  percent  sign,
   asterisk, question mark, or white space. The use of other characters is
   implementation-dependent.

STRUCTURES

   The component name patterns used to describe the request are passed  to
   XkbListComponents   using   an   XkbComponentNamesRec  structure.  This
   structure has no special allocation constraints  or  interrelationships
   with  other structures; allocate and free this structure using standard
   malloc and free calls or their equivalent:

       typedef struct _XkbComponentNames {
           char *         keymap;           / keymap names */
           char *         keycodes;         / keycode names */
           char *         types;            / type names */
           char *         compat;           / compatibility map names */
           char *         symbols;          / symbol names */
           char *         geometry;         / geometry names */
       } XkbComponentNamesRec, *XkbComponentNamesPtr;

   XkbListComponents returns a pointer to an XkbComponentListRec:

       typedef struct _XkbComponentList {
           int                      num_keymaps;  / number of entries in keymap */
           int                      num_keycodes; / number of entries in keycodes */
           int                      num_types;    / number of entries in types */
           int                      num_compat;   / number of entries in compat */
           int                      num_symbols;  / number of entries in symbols */
           int                      num_geometry; / number of entries in geometry;
           XkbComponentNamePtr      keymap;       / keymap names */
           XkbComponentNamePtr      keycodes;     / keycode names */
           XkbComponentNamePtr      types;        / type names */
           XkbComponentNamePtr      compat;       / compatibility map names */
           XkbComponentNamePtr      symbols;      / symbol names */
           XkbComponentNamePtr      geometry;     / geometry names */
       } XkbComponentListRec, *XkbComponentListPtr;

       typedef struct _XkbComponentName {
           unsigned short           flags;        / hints regarding component name */
           char *                   name;         / name of component */
       } XkbComponentNameRec, *XkbComponentNamePtr;

SEE ALSO

   XkbFreeComponentList(3)

NOTES

   Note that the structure  used  to  specify  patterns  on  input  is  an
   XkbComponentNamesRec,  and  that  used to hold the individual component
   names upon return is an XkbComponentNameRec (no trailing `s' in Name).





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