Get the effective shift level for a key in a given keyboard state and
layout.
@param state The keyboard state.
@param key The keycode of the key.
@param layout The layout for which to get the shift level. This must be
smaller than:
@code xkb_keymap_num_layouts_for_key(keymap, key) @endcode
usually it would be:
@code xkb_state_key_get_layout(state, key) @endcode
@return The shift level index. If the key or layout are invalid,
returns XKB_LEVEL_INVALID.
@invariant If the returned level is valid, the following always holds:
@code
xkb_state_key_get_level(state, key, layout) < xkb_keymap_num_levels_for_key(keymap, key, layout)
@endcode
Get the effective shift level for a key in a given keyboard state and layout.
@param state The keyboard state. @param key The keycode of the key. @param layout The layout for which to get the shift level. This must be smaller than: @code xkb_keymap_num_layouts_for_key(keymap, key) @endcode usually it would be: @code xkb_state_key_get_layout(state, key) @endcode
@return The shift level index. If the key or layout are invalid, returns XKB_LEVEL_INVALID.
@invariant If the returned level is valid, the following always holds: @code xkb_state_key_get_level(state, key, layout) < xkb_keymap_num_levels_for_key(keymap, key, layout) @endcode
@memberof xkb_state