Type Definition xkbcommon::xkb::LedIndex

type LedIndex = u32;

Index of a keyboard LED.

LEDs are logical objects which may be active or inactive. They typically correspond to the lights on the keyboard. Their state is determined by the current keyboard state.

LED indices are non-consecutive. The first LED has index 0.

Each LED must have a name, and the names are unique. Therefore, it is safe to use the name as a unique identifier for a LED. The names of some common LEDs are provided in the xkbcommon/xkbcommon-names.h header file. LED names are case-sensitive.

@warning A given keymap may specify an exact index for a given LED. Therefore, LED indexing is not necessarily sequential, as opposed to modifiers and layouts. This means that when iterating over the LEDs in a keymap using e.g. xkb_keymap_num_leds(), some indices might be invalid. Given such an index, functions like xkb_keymap_led_get_name() will return NULL, and xkb_state_led_index_is_active() will return -1.

LEDs are also called “indicators” by XKB.