154 lines
5.1 KiB
Groff
154 lines
5.1 KiB
Groff
.\" Copyright (c) 1999 - Sun Microsystems, Inc.
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.\" All rights reserved.
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.\"
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.\" Permission is hereby granted, free of charge, to any person obtaining a
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.\" copy of this software and associated documentation files (the
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.\" "Software"), to deal in the Software without restriction, including
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.\" without limitation the rights to use, copy, modify, merge, publish,
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.\" distribute, and/or sell copies of the Software, and to permit persons
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.\" to whom the Software is furnished to do so, provided that the above
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.\" copyright notice(s) and this permission notice appear in all copies of
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.\" the Software and that both the above copyright notice(s) and this
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.\" permission notice appear in supporting documentation.
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.\"
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.\" THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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.\" OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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.\" MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT
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.\" OF THIRD PARTY RIGHTS. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
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.\" HOLDERS INCLUDED IN THIS NOTICE BE LIABLE FOR ANY CLAIM, OR ANY SPECIAL
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.\" INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES WHATSOEVER RESULTING
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.\" FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
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.\" NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
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.\" WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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.\"
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.\" Except as contained in this notice, the name of a copyright holder
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.\" shall not be used in advertising or otherwise to promote the sale, use
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.\" or other dealings in this Software without prior written authorization
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.\" of the copyright holder.
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.\"
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.TH XkbKeyActionEntry __libmansuffix__ __xorgversion__ "XKB FUNCTIONS"
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.SH NAME
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XkbKeyActionEntry \- Returns the key action corresponding to group grp and shift
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level lvl from the
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two-dimensional table of key actions associated with the key corresponding to
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keycode
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.SH SYNOPSIS
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.B XkbAction XkbKeyActionEntry macro
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(
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.I xkb,
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.I keycode,
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.I shift,
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.I grp
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)
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.br
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XkbDescPtr \fIxkb\fP\^;
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.br
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KeyCode \fIkeycode\fP\^;
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.br
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int \fIshift\fP\^;
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.br
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int \fIgrp\fP\^;
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.if n .ti +5n
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.if t .ti +.5i
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.SH ARGUMENTS
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.TP
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.I \- xkb
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Xkb description of interest
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.TP
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.I \- keycode
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keycode of interest
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.TP
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.I \- shift
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shift level within group
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.TP
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.I \- grp
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group index for group of interest
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.SH DESCRIPTION
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.LP
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A key action defines the effect key presses and releases have on the internal
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state of the server. For example,
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the expected key action associated with pressing the Shift key is to set the
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Shift modifier. There is zero or one
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key action associated with each keysym bound to each key.
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Just as the entire list of key symbols for the keyboard mapping is held in the
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.I syms
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field of the client map, the entire list of key actions for the keyboard mapping
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is held in the
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.I acts
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array of the server map. The total size of
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.I acts
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is specified by
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.I size_acts,
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and the number of entries is specified by
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.I num_acts.
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The
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.I key_acts
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array, indexed by keycode, describes the actions associated with a key. The
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.I key_acts
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array has
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.I min_key_code
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unused entries at the start to allow direct indexing using a keycode. If a
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.I key_acts
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entry is zero, it means the key does not have any actions associated with it. If
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an entry is not zero, the entry
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represents an index into the
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.I acts
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field of the server map, much as the
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.I offset
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field of a KeySymMapRec structure is an index into the
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.I syms
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field of the client map.
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The reason the
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.I acts
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field is a linear list of XkbActions is to reduce the memory consumption
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associated with a keymap. Because Xkb
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allows individual keys to have multiple shift levels and a different number of
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groups per key, a single
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two-dimensional array of KeySyms would potentially be very large and sparse.
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Instead, Xkb provides a small
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two-dimensional array of XkbActions for each key. To store all of these
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individual arrays, Xkb concatenates each
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array together in the
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.I acts
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field of the server map.
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The key action structures consist only of fields of type char or unsigned char.
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This is done to optimize data
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transfer when the server sends bytes over the wire. If the fields are anything
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but bytes, the server has to sift
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through all of the actions and swap any nonbyte fields. Because they consist of
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nothing but bytes, it can just
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copy them out.
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.I XkbKeyActionEntry
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returns the key action corresponding to group
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.I grp
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and shift level
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.I lvl
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from the two-dimensional table of key actions associated with the key
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corresponding to
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.I keycode.
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.SH STRUCTURES
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.LP
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The KeySymMapRec structure is defined as follows:
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.nf
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#define XkbNumKbdGroups 4
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#define XkbMaxKbdGroup (XkbNumKbdGroups-1)
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typedef struct { /\(** map to keysyms for a single keycode
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*/
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unsigned char kt_index[XkbNumKbdGroups]; /\(** key type index for
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each group */
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unsigned char group_info; /\(** # of groups and out of range group
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handling */
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unsigned char width; /\(** max # of shift levels for key */
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unsigned short offset; /\(** index to keysym table in syms array
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*/
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} XkbSymMapRec, *XkbSymMapPtr;
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.fi
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