Trait BackendEventSource 

pub trait BackendEventSource {
    type Error: Debug + Display;

    // Required methods
    fn size(&self) -> Result<(u16, u16), Self::Error>;
    fn set_features(
        &mut self,
        features: BackendFeatures,
    ) -> Result<(), Self::Error>;
    fn poll_event(&mut self, timeout: Duration) -> Result<bool, Self::Error>;
    fn read_event(&mut self) -> Result<Option<Event>, Self::Error>;
}

Event source abstraction: terminal size queries, feature toggles, and event I/O.

This is the input half of the backend boundary. The runtime polls this for canonical Event values without knowing whether they come from crossterm, raw Unix reads, or DOM events.

Required Associated Types

type Error: Debug + Display

Platform-specific error type.

Required Methods

fn size(&self) -> Result<(u16, u16), Self::Error>

Query current terminal dimensions (columns, rows).

fn set_features(&mut self, features: BackendFeatures) -> Result<(), Self::Error>

Enable or disable terminal features (mouse, paste, focus, kitty keyboard).

Backends must track current state and only emit escape sequences for changes.

fn poll_event(&mut self, timeout: Duration) -> Result<bool, Self::Error>

Poll for an available event, returning true if one is ready.

Must not block longer than timeout. Returns Ok(false) on timeout.

fn read_event(&mut self) -> Result<Option<Event>, Self::Error>

Read the next available event, or None if none is ready.

Call after poll_event returns true, or speculatively.

Implementors

impl BackendEventSource for HeadlessEventSource

type Error = Error