Man page 3 : XkbChangeTypesOfKey

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

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

• - 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

XkbChangeTypesOfKeyreallocates 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, XkbChangeTypesOfKeyadds the XkbKeySymsMask to the changes field of p_changesand modifies the first_key_symand num_key_symsfields of p_changesto include the keythat was changed. See STRUCTURE for more information on the XkbMapChangesPtr structure. If successful, XkbChangeTypesOfKeyreturns Success. The n_groupsparameter specifies the new number of groups for the key. The groupsparameter 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 XkbGroup4Mask. The new_types_inparameter 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_inarray is indexed by group index; if n_groupsis four and groupsonly has Group1Mask and Group3Mask set, new_types_inlooks 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:

If the Xkb extension has not been properly initialized, XkbChangeTypesOfKeyreturns BadAccess. If the xkbparameter it not valid (that is, it is NULL or it does not contain a valid client map), XkbChangeTypesOfKeyreturns BadMatch. If the keyis not a valid keycode, n_groupsis greater than XkbNumKbdGroups, or the groupsmask does not contain any of the valid group mask bits, XkbChangeTypesOfKeyreturns BadValue. If it is necessary to resize the key symbols or key actions arrays and any allocation errors occur, XkbChangeTypesOfKeyreturns BadAlloc.

Use the XkbMapChangesRec structure to identify and track partial modifications to the mapping 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;

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