Trait RenderObserver 

pub trait RenderObserver {
    // Required method
    fn on_event(&mut self, byte_offset: u64, event: &Event<'_>);
}

Observer invoked on every event the render state machine processes.

Implementations typically accumulate a side-table mapping output byte offsets to structural events. The default NoopObserver discards every call and compiles away under the optimiser.

Required Methods

fn on_event(&mut self, byte_offset: u64, event: &Event<'_>)

Called immediately before the event is rendered.

byte_offset is the number of bytes written to the output so far. Observers must not mutate the event; they receive it by shared reference.

Dyn Compatibility

This trait is dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementations on Foreign Types

impl<O: RenderObserver + ?Sized> RenderObserver for &mut O

fn on_event(&mut self, byte_offset: u64, event: &Event<'_>)

Implementors

impl RenderObserver for HeadingRecorder

impl RenderObserver for NoopObserver