Manpages - XkbChangeNames.3

XkbChangeNames - summary-line

Bool XkbChangeNames ( Display **/dpy/ ,* unsigned int */which/ ,* XkbDescPtr */Xkb/ );*

- dpy

connection to the X server

- which

mask of names or map components to be updated

- Xkb

keyboard description to be updated

XkbChangeNames provides a more flexible method for changing symbolic names than XkbSetNames and requires the use of an XkbNameChangesRec structure.

XkbChangeNames copies any names specified by changes from the keyboard description, xkb, to the X server specified by dpy. XkbChangeNames aborts and returns False if any illegal type names or type shift level names are specified by changes.

To change the symbolic names in the server, first modify a local copy of the keyboard description and then use either XkbSetNames, or, to save network traffic, use a XkbNameChangesRec structure and call XkbChangeNames to download the changes to the server. XkbSetNames and XkbChangeNames can generate BadAlloc, BadAtom, BadLength, BadMatch, and BadImplementation errors.

The XkbNameChangesRec allows applications to identify small modifications to the symbolic names and effectively reduces the amount of traffic sent to the server:

      typedef struct _XkbNameChanges {
          unsigned int   changed;            /* name components that have changed 
  */
          unsigned char  first_type;         /* first key type with a new name */
          unsigned char  num_types;          /* number of types with new names */
          unsigned char  first_lvl;          /* first key type with new level 
  names */
          unsigned char  num_lvls;           /* number of key types with new level 
  names */
          unsigned char  num_aliases;        /* if key aliases changed, total 
  number of key aliases */
          unsigned char  num_rg;             /* if radio groups changed, total 
  number of radio groups */
          unsigned char  first_key;          /* first key with a new name */
          unsigned char  num_keys;           /* number of keys with new names */
          unsigned short changed_vmods;      /* mask of virtual modifiers for 
  which names have changed */
          unsigned long  changed_indicators; /* mask of indicators for which names 
  were changed */
          unsigned char  changed_groups;     /* mask of groups for which names 
  were changed */
      } XkbNameChangesRec, *XkbNameChangesPtr
      

The changed field specifies the name components that have changed and is the bitwise inclusive OR of the valid names mask bits defined in Table 1. The rest of the fields in the structure specify the ranges that have changed for the various kinds of symbolic names, as shown in Table 2.

Xkb provides several functions that work with symbolic names. Each of these functions uses a mask to specify individual fields of the structures described above. These masks and their relationships to the fields in a keyboard description are shown in Table 1.

TABLE

TABLE

BadAlloc

Unable to allocate storage

BadAtom

A name is neither a valid Atom or None

BadImplementation

Invalid reply from server

BadLength

The length of a request is shorter or longer than that required to minimally contain the arguments

BadMatch

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

*XkbSetNames*(3)