Crate focus_chain_provider

Provides a hanging-get implementation of the fuchsia.ui.focus.FocusChainProvider protocol.

• Create a new publisher and request stream handler using make_publisher_and_stream_handler().
• Handle a new client’s stream of watch requests using FocusChainProviderRequestStreamHandler::handle_request_stream.
• Update the focus chain using FocusChainProviderPublisher::set_state_and_notify_if_changed or FocusChainProviderPublisher::set_state_and_notify_always.

Structs

FocusChainProviderPublisher

Allows new focus chain values to be stored for transmission to watcher clients (through the corresponding FocusChainProviderRequestStreamHandler).

FocusChainProviderRequestStreamHandler

Handles streams of requests from FocusChainProvider clients, responding to them with the latest value from the corresponding FocusChainProviderPublisher.

Functions

make_publisher_and_stream_handler

Creates a new publisher and stream handler pair. Their initial focus chain value is always FocusKoidChain::EMPTY.