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'\" t
.\" 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 XkbAllocDeviceLedInfo __libmansuffix__ __xorgversion__ "XKB FUNCTIONS"
.SH NAME
XkbAllocDeviceLedInfo \- Obtain an XkbDeviceLedInfoRec structure
.SH SYNOPSIS
.B Status XkbAllocDeviceLedInfo
(
.I device_info,
.I num_needed
)
.br
XkbDeviceInfoPtr \fIdevice_info\fP\^;
.br
int \fInum_needed\fP\^;
.if n .ti +5n
.if t .ti +.5i
.SH ARGUMENTS
.TP
.I \- device_info
structure in which to allocate LED space
.TP
.I \- num_needed
number of indicators to allocate space for
.SH DESCRIPTION
.LP
.I XkbAllocDeviceLedInfo
allocates space for an XkbDeviceLedInfoRec and places it in
.I device_info.
If
.I num_needed
is nonzero,
.I num_needed
XkbIndicatorMapRec structures are also allocated and linked into the XkbDeviceLedInfoRec structure. If you request XkbIndicatorMapRec structures be allocated using this request, you must initialize them explicitly. All other fields are initialized to zero.
To initialize an XkbDeviceLedInfoRec structure, use
.I XkbAddDeviceLedInfo.
.SH STRUCTURES
.LP
Information about X Input Extension devices is transferred between a client program and the Xkb
extension in an XkbDeviceInfoRec structure:
.nf
typedef struct {
char * name; /\(** name for device */
Atom type; /\(** name for class of devices */
unsigned short device_spec; /\(** device of interest */
Bool has_own_state; /\(** True=>this device has its own state */
unsigned short supported; /\(** bits indicating supported capabilities */
unsigned short unsupported; /\(** bits indicating unsupported capabilities */
unsigned short num_btns; /\(** number of entries in btn_acts */
XkbAction * btn_acts; /\(** button actions */
unsigned short sz_leds; /\(** total number of entries in LEDs vector */
unsigned short num_leds; /\(** number of valid entries in LEDs vector */
unsigned short dflt_kbd_fb; /\(** input extension ID of default (core kbd) indicator */
unsigned short dflt_led_fb; /\(** input extension ID of default indicator feedback */
XkbDeviceLedInfoPtr leds; /\(** LED descriptions */
} XkbDeviceInfoRec, *XkbDeviceInfoPtr;
typedef struct {
unsigned short led_class; /\(** class for this LED device*/
unsigned short led_id; /\(** ID for this LED device */
unsigned int phys_indicators; /\(** bits for which LEDs physically present */
unsigned int maps_present; /\(** bits for which LEDs have maps in maps */
unsigned int names_present; /\(** bits for which LEDs are in names */
unsigned int state; /\(** 1 bit => corresponding LED is on */
Atom names[XkbNumIndicators]; /\(** names for LEDs */
XkbIndicatorMapRec maps; /\(** indicator maps for each LED */
} XkbDeviceLedInfoRec, *XkbDeviceLedInfoPtr;
.fi
Each indicator has its own set of attributes that specify whether clients can explicitly set its state and whether it tracks the keyboard state. The attributes of each indicator are held in the maps array, which is an array of XkbIndicatorRec structures:
.nf
typedef struct {
unsigned char flags; /\(** how the indicator can be changed */
unsigned char which_groups; /\(** match criteria for groups */
unsigned char groups; /\(** which keyboard groups the indicator watches */
unsigned char which_mods; /\(** match criteria for modifiers */
XkbModsRec mods; /\(** which modifiers the indicator watches */
unsigned int ctrls; /\(** which controls the indicator watches */
} XkbIndicatorMapRec, *XkbIndicatorMapPtr;
.fi
This indicator map specifies for each indicator:
.IP \(bu 5
The conditions under which the keyboard modifier state affects the indicator
.IP \(bu 5
The conditions under which the keyboard group state affects the indicator
.IP \(bu 5
The conditions under which the state of the boolean controls affects the indicator
.IP \(bu 5
The effect (if any) of attempts to explicitly change the state of the indicator using the functions XkbSetControls or XChangeKeyboardControl
.SH "SEE ALSO"
.BR XkbAddDeviceLedInfo (__libmansuffix__),
.BR XkbSetControls (__libmansuffix__)
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