Struct RegisteredHandler 

pub struct RegisteredHandler {
    pub plugin: String,
    pub priority: i32,
    pub platforms: Vec<String>,
    pub handler: EventHandlerFn,
    pub user_data: *mut c_void,
}

A registered on(tag) event handler. user_data is the plugin’s opaque context, passed back unchanged on every dispatch. plugin is the display name of the owning extension (host-side only — stamped from the cdylib path at registration; not part of the ABI), used for lifecycle veto diagnostics (“extension foo aborted before_tui_start”).

priority/platforms are the owning plugin’s declaration (P2): the snapshot sorts handlers by priority (smaller first, stable), and dispatch skips a handler whose non-empty platforms excludes the host platform. Both default to 100 / empty (all platforms); a plugin sets them via the unified C ABI declare callback.

SAFETY contract: the plugin guarantees handler is safe to call from any thread (the host dispatches from the async emitter thread) and user_data is valid for the registry’s lifetime. The host never frees user_data (plugin-owned).

Fields

plugin: String

Display name of the owning extension (from the cdylib file stem).

priority: i32

Dispatch order (smaller runs first). Default 100.

platforms: Vec<String>

Platforms this handler’s plugin supports (empty = all). Matched against current_platform.

handler: EventHandlerFn

user_data: *mut c_void

Trait Implementations

impl Clone for RegisteredHandler

fn clone(&self) -> Self

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Send for RegisteredHandler

impl Sync for RegisteredHandler