138 lines
4.7 KiB
Groff
138 lines
4.7 KiB
Groff
.\" Copyright 1999 Oracle and/or its affiliates. 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 "Software"),
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.\" to deal in the Software without restriction, including without limitation
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.\" the rights to use, copy, modify, merge, publish, distribute, sublicense,
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.\" and/or sell copies of the Software, and to permit persons to whom the
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.\" Software is furnished to do so, subject to the following conditions:
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.\"
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.\" The above copyright notice and this permission notice (including the next
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.\" paragraph) shall be included in all copies or substantial portions of the
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.\" Software.
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.\"
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.\" THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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.\" IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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.\" FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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.\" THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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.\" LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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.\" FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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.\" DEALINGS IN THE SOFTWARE.
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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 a pointer to the key action corresponding to
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group grp and shift level lvl from the two-dimensional table of key actions
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associated with the key corresponding to
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keycode
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.SH SYNOPSIS
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.HP
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.B XkbAction * XkbKeyActionEntry
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.BI "(\^XkbDescPtr " "xkb" "\^,"
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.BI "KeyCode " "keycode" "\^,"
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.BI "int " "shift" "\^,"
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.BI "int " "grp" "\^);"
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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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