You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: key_codes.rs
    path of file: ./repos/cursive/cursive/examples
    
    the code of the file until where you have to start completion: use cursive::event::{Event, EventResult};
use cursive::traits::*;
use cursive::Printer;

// This example define a custom view that prints any event it receives.
// This is a handy way to check the input received by cursive.

fn main() {
    let mut siv = cursive::default();
    siv.add_layer(KeyCodeView::new(10).full_widt
    
    fn on_event(&mut self, event: Event) -> EventResult {
        // Each line will be a debug-format of the event.
        let line = format!("{event:?}");
        self.history.push(line);

        // Keep a fixed-sized history.
        while self.history.len() > self.size {
            self.history.remove(0);
        }

        // No need to return any callback.
        EventResult::Consumed(None)
    }