XkbAllocDeviceLedInfo − Obtain an XkbDeviceLedInfoRec structure
Status XkbAllocDeviceLedInfo |
(XkbDeviceInfoPtr device_info, int |
num_needed);
− device_info
structure in which to allocate LED space
− num_needed
number of indicators to allocate space for
XkbAllocDeviceLedInfo allocates space for an XkbDeviceLedInfoRec and places it in device_info. If num_needed is nonzero, 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 XkbAddDeviceLedInfo.
Information about X Input Extension devices is transferred between a client program and the Xkb extension in an XkbDeviceInfoRec structure:
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;
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:
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;
This indicator map specifies for each indicator:
• |
The conditions under which the keyboard modifier state affects the indicator | ||
• |
The conditions under which the keyboard group state affects the indicator | ||
• |
The conditions under which the state of the boolean controls affects the indicator | ||
• |
The effect (if any) of attempts to explicitly change the state of the indicator using the functions XkbSetControls or XChangeKeyboardControl |
XkbAddDeviceLedInfo(3), XkbSetControls(3)
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