XkbOutOfRangeGroupNumber - Man Page

unsigned char XkbOutOfRangeGroupNumber (unsigned char grp_inf);

grp_inf

Xkb description of interest

XkbOutOfRangeGroupNumber returns the out-of-range group number, represented as a group index, from the group_info field of an XkbSymMapRec structure.

The group_info field of an XkbSymMapRec is an encoded value containing the number of groups of  symbols bound to the  key as well as the specification of the treatment of out-of-range groups. It is  legal for a key to  have zero groups, in which case it also has zero symbols and all events from  that key yield NoSymbol.  To obtain the number of groups of symbols bound to the key, use XkbKeyNumGroups. To change the number of groups bound to a key, use XkbChangeTypesOfKey. To obtain a mask that determines the treatment of out-of-range groups, use XkbKeyGroupInfo and XkbOutOfRangeGroupInfo.

The keyboard controls contain a groups_wrap field specifying the handling of illegal groups on a global basis. That is, when  the user performs an  action causing the effective group to go out of the legal range, the groups_wrap field specifies how to normalize the effective keyboard group to a group that is  legal for the  keyboard as a whole, but there is no guarantee that the normalized group will be  within the range of  legal groups for any individual key. The per-key group_info field specifies how a key treats a legal effective group if the key does not  have a type specified for  the group of concern. For example, the Enter key usually has just one group  defined. If the user  performs an action causing the global keyboard group to change to Group2, the group_info field for the Enter key describes how to handle this situation.

Out-of-range groups for individual keys are mapped to a legal group using the  same options as are used  for the overall keyboard group. The particular type of mapping used is  controlled by the bits set in  the group_info flag, as shown in Table 1.

The KeySymMapRec structure is defined as follows:

    #define XkbNumKbdGroups             4
    #define XkbMaxKbdGroup              (XkbNumKbdGroups-1)
    
    typedef struct {                    /* map to keysyms for a single keycode */
        unsigned char       kt_index[XkbNumKbdGroups];  /* key type index for each group */
        unsigned char       group_info; /* # of groups and out of range group handling */
        unsigned char       width;      /* max # of shift levels for key */
        unsigned short      offset;     /* index to keysym table in syms array */
} XkbSymMapRec, *XkbSymMapPtr;

The XkbControlsRec structure is defined as follows:

    #define XkbMaxLegalKeyCode     255
    #define XkbPerKeyBitArraySize  ((XkbMaxLegalKeyCode+1)/8)
    
    
    typedef struct {
        unsigned char   mk_dflt_btn;      /* default button for keyboard driven mouse */
        unsigned char   num_groups;       /* number of keyboard groups */
        unsigned char   groups_wrap;      /* how to wrap out-of-bounds groups */
        XkbModsRec      internal;         /* defines server internal modifiers */
        XkbModsRec      ignore_lock;      /* modifiers to ignore when checking for grab */
        unsigned int    enabled_ctrls;    /* 1 bit => corresponding boolean control enabled */
        unsigned short  repeat_delay;     /* ms delay until first repeat */
        unsigned short  repeat_interval;  /* ms delay between repeats */
        unsigned short  slow_keys_delay;  /* ms minimum time key must be down to be ok */
        unsigned short  debounce_delay;   /* ms delay before key reactivated */
        unsigned short  mk_delay;         /* ms delay to second mouse motion event */
        unsigned short  mk_interval;      /* ms delay between repeat mouse events */
        unsigned short  mk_time_to_max;   /* # intervals until constant mouse move */
        unsigned short  mk_max_speed;     /* multiplier for maximum mouse speed */
        short           mk_curve;         /* determines mouse move curve type */
        unsigned short  ax_options;       /* 1 bit => Access X option enabled */
        unsigned short  ax_timeout;       /* seconds until Access X disabled */
        unsigned short  axt_opts_mask;    /* 1 bit => options to reset on Access X timeout */
        unsigned short  axt_opts_values;  /* 1 bit => turn option on, 0=> off */
        unsigned int    axt_ctrls_mask;   /* which bits in enabled_ctrls to modify */
        unsigned int    axt_ctrls_values; /* values for new bits in enabled_ctrls */
        unsigned char   per_key_repeat[XkbPerKeyBitArraySize];  /* per key auto repeat */
     } XkbControlsRec, *XkbControlsPtr;

The XkbControlsRec structure is defined as follows:

    #define XkbMaxLegalKeyCode     255
    #define XkbPerKeyBitArraySize  ((XkbMaxLegalKeyCode+1)/8)
    
    
    typedef struct {
        unsigned char   mk_dflt_btn;      /* default button for keyboard driven mouse */
        unsigned char   num_groups;       /* number of keyboard groups */
        unsigned char   groups_wrap;      /* how to wrap out-of-bounds groups */
        XkbModsRec      internal;         /* defines server internal modifiers */
        XkbModsRec      ignore_lock;      /* modifiers to ignore when checking for grab */
        unsigned int    enabled_ctrls;    /* 1 bit => corresponding boolean control enabled */
        unsigned short  repeat_delay;     /* ms delay until first repeat */
        unsigned short  repeat_interval;  /* ms delay between repeats */
        unsigned short  slow_keys_delay;  /* ms minimum time key must be down to be ok */
        unsigned short  debounce_delay;   /* ms delay before key reactivated */
        unsigned short  mk_delay;         /* ms delay to second mouse motion event */
        unsigned short  mk_interval;      /* ms delay between repeat mouse events */
        unsigned short  mk_time_to_max;   /* # intervals until constant mouse move */
        unsigned short  mk_max_speed;     /* multiplier for maximum mouse speed */
        short           mk_curve;         /* determines mouse move curve type */
        unsigned short  ax_options;       /* 1 bit => Access X option enabled */
        unsigned short  ax_timeout;       /* seconds until Access X disabled */
        unsigned short  axt_opts_mask;    /* 1 bit => options to reset on Access X timeout */
        unsigned short  axt_opts_values;  /* 1 bit => turn option on, 0=> off */
        unsigned int    axt_ctrls_mask;   /* which bits in enabled_ctrls to modify */
        unsigned int    axt_ctrls_values; /* values for new bits in enabled_ctrls */
        unsigned char   per_key_repeat[XkbPerKeyBitArraySize];  /* per key auto repeat */
     } XkbControlsRec, *XkbControlsPtr;

XkbChangeTypesOfKey(3), XkbKeyGroupInfo(3), XkbOutOfRangeGroupInfo(3)