Table of Contents


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
        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,
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
which names have changed */
        unsigned long  changed_indicators; /* mask of indicators for which
were changed */
        unsigned char  changed_groups;     /* mask of groups for which
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
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,
           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
XkbKTLevelNamesMask    first_lvl,    Xkb->map    type[*].lvl_names[*]
XkbKeyAliasesMask    num_aliases    Xkb->names    key_aliases[*]
XkbRGNamesMask    num_rg    Xkb->names    radio_groups[*]
XkbKeyNamesMask    first_key,    Xkb->names    keys[*]
XkbVirtualModNamesMask    changed_vmods    Xkb->names    vmods[*]
XkbIndicatorNamesMask    changed_indicators    Xkb->names    indicators[*]
XkbGroupNamesMask    changed_groups    Xkb->names    groups[*]


Unable to allocate storage
A name is neither a valid Atom or None
Invalid reply from server
The length of a request is shorter or longer than that required to minimally contain the arguments
A compatible version of Xkb was not available in the server or an argument has correct type and range, but is otherwise invalid

See Also


Table of Contents