Struct ReducerContext 

pub struct ReducerContext<'a, 'b, 'c, S: AppState> {
    pub effects: &'a mut Effects<'b, S>,
    pub input: &'c ActionInput,
}

The context passed to modern 3-argument reducer handlers.

Provides access to the Effects builder (for emitting side-effects) and the ActionInput that accompanied the dispatch (e.g. effect results, pointer coordinates, drop payloads).

Example

fn handle_click(
    state: &mut AppState,
    action: ClickAction,
    ctx: &mut ReducerContext<AppState>,
) {
    // Read pointer position from the input
    if let Some((x, y, _, _)) = ctx.input.as_pointer() {
        state.last_click = (x, y);
    }
    // Issue an HTTP GET effect
    ctx.effects.http_get("https://api.example.com/clicked");
}

Fields

effects: &'a mut Effects<'b, S>

Mutable reference to the effects builder.

input: &'c ActionInput

The input data that accompanied this action dispatch.