Maps action IDs to the normalized keys that trigger them (for stopAction).
Keys allowed to pass through a modal barrier while this focus target is active.
Registered key bindings (evaluation order).
Key rules marked as transparent on this target (pass-through).
OptionalrefNumber of live bindings holding this target.
Only maintained when the engine runs with releaseFocusWhenEmpty; the
target is removed once the last holder releases it (see
LayerManager.releaseFocus). Optional so the exported type stays
backwards compatible — the engine always initializes it.
Key rules stopped on this target (propagation barrier).
Keyboard state for a single named focus target on a screen layer.
Focus targets allow multiple form controls on the same screen to have independent key bindings. Only the currently active target receives events; inactive targets are skipped.