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CentOS 7.0 - man page for xkbchangetypesofkey (centos section 3)

XkbChangeTypesOfKey(3)			  XKB FUNCTIONS 		   XkbChangeTypesOfKey(3)

NAME
       XkbChangeTypesOfKey - Change the number of groups and the types bound to a key

SYNOPSIS
       Status  XkbChangeTypesOfKey  (XkbDescPtr  xkb, int key, int n_groups, unsigned int groups,
	      int *new_types_in, XkbMapChangesPtr p_changes);

ARGUMENTS
       - xkb  keyboard description to be changed

       - key  keycode for key of interest

       - n_groups
	      new number of groups for key

       - groups
	      mask indicating groups to change

       - new_types_in
	      indices for new groups specified in groups

       - p_changes
	      notes changes made to xkb

DESCRIPTION
       XkbChangeTypesOfKey reallocates the symbols and actions bound to the  key,  if  necessary,
       and initializes any new symbols or actions to NoSymbol or NoAction, as appropriate. If the
       p_changes parameter is not  NULL,  XkbChangeTypesOfKey  adds  the  XkbKeySymsMask  to  the
       changes	field  of  p_changes  and  modifies  the first_key_sym and num_key_syms fields of
       p_changes to include the key that was changed. See STRUCTURE for more information  on  the
       XkbMapChangesPtr structure. If successful, XkbChangeTypesOfKey returns Success.

       The  n_groups parameter specifies the new number of groups for the key. The groups parame-
       ter is a mask specifying the groups for which new types are  supplied  and  is  a  bitwise
       inclusive OR of the following masks: XkbGroup1Mask, XkbGroup2Mask, XkbGroup3Mask, and Xkb-
       Group4Mask.

       The new_types_in parameter is an integer array of length n_groups.  Each entry  represents
       the  type  to  use  for	the  associated  group and is an index into xkb->map->types.  The
       new_types_in array is indexed by group index; if n_groups is  four  and	groups	only  has
       Group1Mask and Group3Mask set, new_types_in looks like this:

	   new_types_in[0] = type for Group1
	   new_types_in[1] = ignored
	   new_types_in[2] = type for Group3
	   new_types_in[3] = ignored

       For convenience, Xkb provides the following constants to use as indices to the groups:

       Table 1 Group Index Constants
       ------------------------------
       Constant Name	   Value
       ------------------------------
       XkbGroup1Index	   0
       XkbGroup2Index	   1
       XkbGroup3Index	   2
       XkbGroup4Index	   3

       If the Xkb extension has not been properly initialized, XkbChangeTypesOfKey returns BadAc-
       cess. If the xkb parameter it not valid (that is, it is NULL or	it  does  not  contain	a
       valid  client  map),  XkbChangeTypesOfKey returns BadMatch. If the key is not a valid key-
       code, n_groups is greater than XkbNumKbdGroups, or the groups mask does not contain any of
       the  valid  group  mask	bits, XkbChangeTypesOfKey returns BadValue. If it is necessary to
       resize  the  key  symbols  or  key  actions  arrays  and  any  allocation  errors   occur,
       XkbChangeTypesOfKey returns BadAlloc.

STRUCTURES
       Use the XkbMapChangesRec structure to identify and track partial modifications to the map-
       ping components and to reduce the amount of traffic between the server and clients.

       typedef struct _XkbMapChanges {
	   unsigned short   changed;		/* identifies valid components in
       structure */
	   KeyCode	    min_key_code;	/* lowest numbered keycode for device
       */
	   KeyCode	    max_key_code;	/* highest numbered keycode for device
       */
	   unsigned char    first_type; 	/* index of first key type modified */
	   unsigned char    num_types;		/* # types modified */
	   KeyCode	    first_key_sym;	/* first key whose key_sym_map changed
       */
	   unsigned char    num_key_syms;	/* # key_sym_map entries changed */
	   KeyCode	    first_key_act;	/* first key whose key_acts entry
       changed */
	   unsigned char    num_key_acts;	/* # key_acts entries changed */
	   KeyCode	    first_key_behavior; /* first key whose behaviors changed */
	   unsigned char    num_key_behaviors;	/* # behaviors entries changed */
	   KeyCode	    first_key_explicit; /* first key whose explicit entry
       changed */
	   unsigned char    num_key_explicit;	/* # explicit entries changed */
	   KeyCode	    first_modmap_key;	/* first key whose modmap entry changed
       */
	   unsigned char    num_modmap_keys;	/* # modmap entries changed */
	   KeyCode	    first_vmodmap_key;	/* first key whose vmodmap changed */
	   unsigned char    num_vmodmap_keys;	/* # vmodmap entries changed */
	   unsigned char    pad1;		/* reserved */
	   unsigned short   vmods;		/* mask indicating which vmods changed
       */
       } XkbMapChangesRec,*XkbMapChangesPtr;

DIAGNOSTICS
       BadAccess      The Xkb extension has not been properly initialized

       BadAlloc       Unable to allocate storage

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

       BadValue       An argument is out of range

X Version 11				   libX11 1.6.0 		   XkbChangeTypesOfKey(3)


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