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XkbDeviceInfoPtr device_info\^;
unsigned int led_class\^;
unsigned int led_id\^;
- device_info structure in which to add LED info
- led_class input extension class for LED device of interest
- led_id input extension ID for LED device of interest
XkbAddDeviceLedInfo first checks to see whether an entry matching led_class and led_id already exists in the 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 device_info->leds and extends it if there is not enough room. It then increments device_info->num_leds and fills in the next available entry in device_info->leds with led_class and led_id. If successful, XkbAddDeviceLedInfo returns a pointer to the XkbDeviceLedInfoRec structure that was initialized. If unable to allocate sufficient storage, or if device_info points to an invalid XkbDeviceInfoRec structure, or if led_class or led_id are inappropriate, XkbAddDeviceLedInfo returns NULL. To allocate additional space for button actions in an XkbDeviceInfoRec structure, use XkbResizeDeviceButtonActions.
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;