Struct InputPipeline 

pub struct InputPipeline { /* private fields */ }

An InputPipeline manages input devices and propagates input events through input handlers.

On creation, clients declare what types of input devices an InputPipeline manages. The InputPipeline will continuously detect new input devices of supported type(s).

Example

let ime_handler =
    ImeHandler::new(scene_manager.session.clone(), scene_manager.compositor_id).await?;
let touch_handler = TouchHandler::new(
    scene_manager.session.clone(),
    scene_manager.compositor_id,
    scene_manager.display_size
).await?;

let assembly = InputPipelineAssembly::new()
    .add_handler(Box::new(ime_handler)),
    .add_handler(Box::new(touch_handler)),
let input_pipeline = InputPipeline::new(
    vec![
        input_device::InputDeviceType::Touch,
        input_device::InputDeviceType::Keyboard,
    ],
    assembly,
);
input_pipeline.handle_input_events().await;

Implementations

impl InputPipeline

pub fn new_for_test( input_device_types: Vec<InputDeviceType>, assembly: InputPipelineAssembly, ) -> Self

Creates a new InputPipeline for integration testing. Unlike a production input pipeline, this pipeline will not monitor /dev/class/input-report for devices.

Parameters

• input_device_types: The types of devices the new InputPipeline will support.
• assembly: The input handlers that the InputPipeline sends InputEvents to.

pub fn new( input_device_types: Vec<InputDeviceType>, assembly: InputPipelineAssembly, inspect_node: Node, metrics_logger: MetricsLogger, ) -> Result<Self, Error>

Creates a new InputPipeline for production use.

Parameters

• input_device_types: The types of devices the new InputPipeline will support.
• assembly: The input handlers that the InputPipeline sends InputEvents to.
• inspect_node: The root node for InputPipeline’s Inspect tree

pub fn input_device_bindings(&self) -> &InputDeviceBindingHashMap

Gets the input device bindings.

pub fn input_event_sender(&self) -> &UnboundedSender<InputEvent>

Gets the input device sender: this is the channel that should be cloned and used for injecting events from the drivers into the input pipeline.

pub fn input_device_types(&self) -> &Vec<InputDeviceType>

Gets a list of input device types supported by this input pipeline.

pub async fn handle_input_events(self)

Forwards all input events into the input pipeline.

pub async fn handle_input_device_registry_request_stream( stream: InputDeviceRegistryRequestStream, device_types: &Vec<InputDeviceType>, input_event_sender: &UnboundedSender<InputEvent>, bindings: &InputDeviceBindingHashMap, input_devices_node: &Node, metrics_logger: MetricsLogger, ) -> Result<(), Error>

Handles the incoming InputDeviceRegistryRequestStream.

This method will end when the request stream is closed. If the stream closes with an error the error will be returned in the Result.

NOTE: Only one stream is handled at a time. https://fxbug.dev/42061078

Parameters

• stream: The stream of InputDeviceRegistryRequests.
• device_types: The types of devices to watch for.
• input_event_sender: The channel new InputDeviceBindings will send InputEvents to.
• bindings: Holds all the InputDeviceBindings associated with the InputPipeline.
• input_devices_node: The parent node for all injected devices’ inspect nodes.
• metrics_logger: The metrics logger.