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authormarha <marha@users.sourceforge.net>2009-06-28 22:07:26 +0000
committermarha <marha@users.sourceforge.net>2009-06-28 22:07:26 +0000
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+.\" Copyright (c) 1999 - Sun Microsystems, Inc.
+.\" All rights reserved.
+.\"
+.\" Permission is hereby granted, free of charge, to any person obtaining a
+.\" copy of this software and associated documentation files (the
+.\" "Software"), to deal in the Software without restriction, including
+.\" without limitation the rights to use, copy, modify, merge, publish,
+.\" distribute, and/or sell copies of the Software, and to permit persons
+.\" to whom the Software is furnished to do so, provided that the above
+.\" copyright notice(s) and this permission notice appear in all copies of
+.\" the Software and that both the above copyright notice(s) and this
+.\" permission notice appear in supporting documentation.
+.\"
+.\" THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+.\" OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+.\" MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT
+.\" OF THIRD PARTY RIGHTS. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
+.\" HOLDERS INCLUDED IN THIS NOTICE BE LIABLE FOR ANY CLAIM, OR ANY SPECIAL
+.\" INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES WHATSOEVER RESULTING
+.\" FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
+.\" NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
+.\" WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+.\"
+.\" Except as contained in this notice, the name of a copyright holder
+.\" shall not be used in advertising or otherwise to promote the sale, use
+.\" or other dealings in this Software without prior written authorization
+.\" of the copyright holder.
+.\"
+.TH XkbKeyActionEntry __libmansuffix__ __xorgversion__ "XKB FUNCTIONS"
+.SH NAME
+XkbKeyActionEntry \- Returns the key action corresponding to group grp and shift
+level lvl from the
+two-dimensional table of key actions associated with the key corresponding to
+keycode
+.SH SYNOPSIS
+.B XkbAction XkbKeyActionEntry macro
+(
+.I xkb,
+.I keycode,
+.I shift,
+.I grp
+)
+.br
+ XkbDescPtr \fIxkb\fP\^;
+.br
+ KeyCode \fIkeycode\fP\^;
+.br
+ int \fIshift\fP\^;
+.br
+ int \fIgrp\fP\^;
+.if n .ti +5n
+.if t .ti +.5i
+.SH ARGUMENTS
+.TP
+.I \- xkb
+Xkb description of interest
+.TP
+.I \- keycode
+keycode of interest
+.TP
+.I \- shift
+shift level within group
+.TP
+.I \- grp
+group index for group of interest
+.SH DESCRIPTION
+.LP
+A key action defines the effect key presses and releases have on the internal
+state of the server. For example,
+the expected key action associated with pressing the Shift key is to set the
+Shift modifier. There is zero or one
+key action associated with each keysym bound to each key.
+
+Just as the entire list of key symbols for the keyboard mapping is held in the
+.I syms
+field of the client map, the entire list of key actions for the keyboard mapping
+is held in the
+.I acts
+array of the server map. The total size of
+.I acts
+is specified by
+.I size_acts,
+and the number of entries is specified by
+.I num_acts.
+
+The
+.I key_acts
+array, indexed by keycode, describes the actions associated with a key. The
+.I key_acts
+array has
+.I min_key_code
+unused entries at the start to allow direct indexing using a keycode. If a
+.I key_acts
+entry is zero, it means the key does not have any actions associated with it. If
+an entry is not zero, the entry
+represents an index into the
+.I acts
+field of the server map, much as the
+.I offset
+field of a KeySymMapRec structure is an index into the
+.I syms
+field of the client map.
+
+The reason the
+.I acts
+field is a linear list of XkbActions is to reduce the memory consumption
+associated with a keymap. Because Xkb
+allows individual keys to have multiple shift levels and a different number of
+groups per key, a single
+two-dimensional array of KeySyms would potentially be very large and sparse.
+Instead, Xkb provides a small
+two-dimensional array of XkbActions for each key. To store all of these
+individual arrays, Xkb concatenates each
+array together in the
+.I acts
+field of the server map.
+
+The key action structures consist only of fields of type char or unsigned char.
+This is done to optimize data
+transfer when the server sends bytes over the wire. If the fields are anything
+but bytes, the server has to sift
+through all of the actions and swap any nonbyte fields. Because they consist of
+nothing but bytes, it can just
+copy them out.
+
+.I XkbKeyActionEntry
+returns the key action corresponding to group
+.I grp
+and shift level
+.I lvl
+from the two-dimensional table of key actions associated with the key
+corresponding to
+.I keycode.
+.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