Events and Messages

Univis events use Bevy messages via #[derive(Message)].

Common examples include:

• ButtonClicked
• ToggleChanged
• SelectChanged
• SeekBarChanged
• TextFieldSubmitted

Consumption Pattern

Typical message handling looks like this:

#![allow(unused)]
fn main() {
fn read_messages(mut events: MessageReader<ButtonClicked>) {
    for event in events.read() {
        // react to the click
    }
}
}

Practical Guidance

• use messages for app-level reactions
• keep local visual state inside widget systems
• avoid duplicating the same state in both widget components and external resources unless needed