'\" t
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.TH XkbAddDeviceLedInfo 3 "libX11 1.8.7" "X Version 11" "XKB FUNCTIONS"
.SH NAME
XkbAddDeviceLedInfo \- Initialize an XkbDeviceLedInfoRec structure
.SH SYNOPSIS
.HP
.B XkbDeviceLedInfoPtr XkbAddDeviceLedInfo
.BI "(\^XkbDeviceInfoPtr " "device_info" "\^,"
.BI "unsigned int " "led_class" "\^,"
.BI "unsigned int " "led_id" "\^);"
.if n .ti +5n
.if t .ti +.5i
.SH ARGUMENTS
.TP
.I device_info
structure in which to add LED info
.TP
.I led_class
input extension class for LED device of interest
.TP
.I led_id
input extension ID for LED device of interest
.SH DESCRIPTION
.LP
.I XkbAddDeviceLedInfo 
first checks to see whether an entry matching 
.I led_class 
and 
.I led_id 
already exists in the 
.I device_info->leds 
array. If it finds a matching entry, it returns a pointer to that entry. Otherwise, it checks to be sure 
there is at least one empty entry in
.I device_info->leds 
and extends it if there is not enough room. It then increments
.I device_info->num_leds 
and fills in the next available entry in 
.I device_info->leds 
with 
.I led_class 
and 
.I led_id.

If successful, 
.I XkbAddDeviceLedInfo 
returns a pointer to the XkbDeviceLedInfoRec structure that was initialized. If unable to allocate 
sufficient storage, or if 
.I device_info 
points to an invalid XkbDeviceInfoRec structure, or if 
.I led_class 
or 
.I led_id 
are inappropriate, 
.I XkbAddDeviceLedInfo 
returns NULL.

To allocate additional space for button actions in an XkbDeviceInfoRec structure, use 
.I XkbResizeDeviceButtonActions.

.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    
.SH "SEE ALSO"
.BR XkbResizeDeviceButtonActions (3)