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::default().