Rust Programming By Example

Messages

Relm widgets communicate by sending messages to other widgets, but also to themselves. For instance, when the delete_event signal is emitted, we can emit the Quit message to our widget and take appropriate action when we receive this message. A message is modeled as an enum using the custom derive Msg that is specific to relm:

#[derive(Msg)]
pub enum Msg {
    Quit,
}

This custom derive is provided by the relm_derive crate.