XkbChangeNames (3) - Linux Manuals

XkbChangeNames: _summary-line_

NAME

XkbChangeNames - _summary-line_

SYNOPSIS

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

ARGUMENTS

- dpy

connection to the X server

- which

mask of names or map components to be updated

- Xkb

keyboard description to be updated

DESCRIPTION

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.

STRUCTURES

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[*]

DIAGNOSTICS

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