Man page 3 : XkbChangeNames

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

XkbChangeNamesprovides a more flexible method for changing symbolic names than XkbSetNamesand requires the use of an XkbNameChangesRec structure. XkbChangeNamescopies any names specified by changesfrom the keyboard description, xkb,to the X server specified by dpy. XkbChangeNamesaborts 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 XkbChangeNamesto download the changes to the server. XkbSetNamesand XkbChangeNamescan 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 changedfield 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.

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

R XkbSetNames (3)