FocusManager

The default {@see FocusManagerInterface} implementation: modulo-wrapped rotation through a deduplicated, non-empty-string-only id list. `$index` is clamped into range at construction and on every rotation, so it can never point outside {@see ids()} even if constructed with an out-of-range starting index.

public function __construct(array $ids = [], int $index = 0):

Parameters

public function currentId(): ?string

The id currently holding focus, or null when nothing does.

public function focus(string $id): void

Moves focus to this id, if it is part of the focus order.

Parameters

public function next(): ?string

Moves focus to the next id in order and returns it, wrapping at the end.

public function previous(): ?string

Moves focus to the previous id in order and returns it, wrapping at the start.

public function ids(): array