path: root/man/xkb/XkbKeyNumGroups.man

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.TH XkbKeyNumGroups __libmansuffix__ __xorgversion__ "XKB FUNCTIONS"
.SH NAME
XkbKeyNumGroups \- Returns the number of groups of symbols bound to the key 
corresponding to keycode
.SH SYNOPSIS
.HP
.B int XkbKeyNumGroups
.BI "(\^XkbDescPtr " "xkb" "\^,"
.BI "KeyCode " "keycode" "\^);"
.if n .ti +5n
.if t .ti +.5i
.SH ARGUMENTS
.TP
.I xkb
Xkb description of interest
.TP
.I keycode
keycode of interest
.SH DESCRIPTION
.LP
The 
.I 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 
.I XkbKeyNumGroups. 
To change the number of groups bound to a key, use 
.I XkbChangeTypesOfKey. 
To obtain a mask that determines the treatment of out-of-range groups, use
.I XkbKeyGroupInfo 
and 
.I XkbOutOfRangeGroupInfo.

The keyboard controls contain a 
.I 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 
.I 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 
.I 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 
.I 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 
.I group_info 
flag, as shown in Table 1.
.bp
.TS
c s
l l
l l.
Table 1 group_info Range Normalization
_
Bits set in group_info	Normalization method
_
XkbRedirectIntoRange	XkbRedirectIntoRange
XkbClampIntoRange	XkbClampIntoRange
none of the above	XkbWrapIntoRange
.TE
.LP
.\"--- Chapter 10
The Xkb extension is composed of two parts: a server extension, and a 
client-side X library extension. 
This chapter discusses functions used to modify controls effecting the behavior 
of the server portion 
of the Xkb extension. X Library Controls discusses functions used to modify 
controls that affect only 
the behavior of the client portion of the extension; those controls are known as 
Library Controls.

Xkb contains control features that affect the entire keyboard, known as global 
keyboard controls. Some 
of the controls may be selectively enabled and disabled; these controls are 
known as the 
.I Boolean Controls. 
Boolean Controls can be turned on or off under program control and can also be 
automatically set to an 
on or off condition when a client program exits. The remaining controls, known 
as the 
.I Non-Boolean Controls, 
are always active. The XkbControlsRec structure describes the current state of 
most of the global 
controls and the attributes effecting the behavior of each of these Xkb 
features. This chapter 
describes the Xkb controls and how to manipulate them.

There are two possible components for each of the Boolean Controls: attributes 
describing how the 
control should work, and a state describing whether the behavior as a whole is 
enabled or disabled. 
The attributes and state for most of these controls are held in the 
XkbControlsRec structure.

You can manipulate the Xkb controls individually, via convenience functions, or 
as a whole. To treat 
them as a group, modify an XkbControlsRec structure to describe all of the 
changes to be made, and 
then pass that structure and appropriate flags to an Xkb library function, or 
use a 
XkbControlsChangesRec to reduce network traffic. When using a convenience 
function to manipulate one 
control individually, you do not use an XkbControlsRec structure directly.

The Xkb controls are grouped as shown in Table 2.
.ad l
.TS
c s s 
l l l
lw(2i) l l.
Table 2 Xkb Keyboard Controls
_
Type of Control	Control Name	Boolean Control?
_
T{
Controls for enabling and \%disabling other controls
T}	EnabledControls	No
\^	AutoReset	No
_
T{
Control for bell behavior
T}	AudibleBell	Boolean
_
T{
Controls for repeat key behavior
T}	PerKeyRepeat	No
\^	RepeatKeys	Boolean
\^	DetectableAutorepeat	Boolean
_
T{
Controls for \%keyboard overlays
T}	Overlay1	Boolean
\^	Overlay2	Boolean
_
T{
Controls for using the mouse from the keyboard
T}	MouseKeys	Boolean
\^	MouseKeysAccel	Boolean
_
T{
Controls for better keyboard access by
physically impaired persons
T}	AccessXFeedback	Boolean
\^	AccessXKeys	Boolean
\^	AccessXTimeout	Boolean
\^	BounceKeys	Boolean
\^	SlowKeys	Boolean
\^	StickyKeys	Boolean
_
T{
Controls for general keyboard mapping
T}	GroupsWrap	No
\^	IgnoreGroupLock	Boolean
\^	IgnoreLockMods	No
\^	InternalMods	No
_
.TE
.ad n

.LP
The individual categories and controls are described first, together with 
functions for manipulating 
them.
.SH STRUCTURES
.LP
The KeySymMapRec structure is defined as follows:
.nf

    #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;

.fi
.LP
The XkbControlsRec structure is defined as follows:
.nf

    #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;
.fi

.nf
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 booleancontrol 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;
.fi
.SH "SEE ALSO"
.BR XkbChangeTypesOfKey (__libmansuffix__),
.BR XkbKeyGroupInfo (__libmansuffix__),
.BR XkbOutOfRangeGroupInfo. (__libmansuffix__)