The input pipeline library tracks available input devices, manages device state, and allows the session to register handlers for events.
An input pipeline runs alongside session. It is preconfigured to support a set of input devices. This will be configurable by the session in the future.
The input pipeline library provides implementations for common input handlers, such as Scenic and input method editors (IME). After the session instantiates components that consume input, the input pipeline directly sends input events to those components through the registered input handlers.
InputDeviceBinding represents a connection to a physical input device (e.g. mouse, keyboard).
InputHandler represents a client of InputEvents.
An input pipeline routes input from physical devices to various clients by doing the following:
Session authors are responsible for setting up input pipelines. More details on how can be found in input_pipeline.rs.
InputDeviceBinding does the following:
InputEvents from the InputDeviceDescriptor and incoming
The input pipeline creates and owns
InputDeviceBindings as new input peripherals are connected to a device.
InputHandler receives an
InputEvent, it does at least one of the following:
InputEvent to the relevant client component.
InputEvents for the next
InputHandler to process.
InputHandlers must satisfy at least one of these conditions, but otherwise their implementation details can vary.
The developer guide includes an example implementation of an