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 1 Symbolic Names Masks |
| Mask Bit Value Keyboard Field |
| Component |
| XkbKeycodesNameMask (1<<0) Xkb->names keycodes |
| XkbGeometryNameMask (1<<1) Xkb->names geometry |
| XkbSymbolsNameMask (1<<2) Xkb->names symbols |
| XkbPhysSymbolsNameMask (1<<3) Xkb->names phys_symbols |
| XkbTypesNameMask (1<<4) Xkb->names type |
| XkbCompatNameMask (1<<5) Xkb->names compat |
| XkbKeyTypeNamesMask (1<<6) Xkb->map type[*].name |
| XkbKTLevelNamesMask (1<<7) Xkb->map type[*].lvl_names[*] |
| XkbIndicatorNamesMask (1<<8) Xkb->names indicators[*] |
| XkbKeyNamesMask (1<<9) Xkb->names keys[*], num_keys |
| XkbKeyAliasesMask (1<<10) Xkb->names key_aliases[*], num_key_aliases |
| XkbVirtualModNamesMask (1<<11) Xkb->names vmods[*] |
| XkbGroupNamesMask (1<<12) Xkb->names groups[*] |
| XkbRGNamesMask (1<<13) Xkb->names radio_groups[*], num_rg |
| XkbComponentNamesMask (0x3f) Xkb->names keycodes, |
| geometry, |
| symbols, |
| physical symbols, |
| types, and |
| compatibility map |
| XkbAllNamesMask (0x3fff) Xkb->names all name components |
| Table 2 XkbNameChanges Fields |
| Mask Fields Component Field |
| XkbKeyTypeNamesMask first_type, Xkb->map type[*].name |
| num_types |
| XkbKTLevelNamesMask first_lvl, Xkb->map type[*].lvl_names[*] |
| num_lvls |
| XkbKeyAliasesMask num_aliases Xkb->names key_aliases[*] |
| XkbRGNamesMask num_rg Xkb->names radio_groups[*] |
| XkbKeyNamesMask first_key, Xkb->names keys[*] |
| num_keys |
| XkbVirtualModNamesMask changed_vmods Xkb->names vmods[*] |
| XkbIndicatorNamesMask changed_indicators Xkb->names indicators[*] |
| XkbGroupNamesMask changed_groups Xkb->names groups[*] |