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: entry.rs
    path of file: ./repos/Relm4/examples
    
    the code of the file until where you have to start completion: use gtk::prelude::*;
use relm4::factory::FactoryVecDeque;
use relm4::prelude::*;

#[derive(Debug)]
enum AppMsg {
    AddCounters,
    Clicked(DynamicIndex),
}

struct Counter {
    value: u8,
}

struct App {
    counters: FactoryVecDeque<Counter>,
    created_counters: u8,
    // stores entered values
    entry: gtk::EntryBuffer,
}

#[relm4::factory]
impl FactoryComponent for Counter {
    type Init = u8;
    type Input = ();
    type Output = AppMsg;
    type CommandOutput = ();
    type ParentWidget = gtk::Box;

    view! {
        gtk::Button {
            #[watch]
            set_label: &self.value.to_string(),
            connect_clicked[index] => move |_| {
                sender.output(AppMsg::Clicked(index.clone())).unwrap();
            },
        }
    }

    fn init_model(value: Self::Init, _index: &DynamicIndex, _sender: FactorySender<Self>) -> Self {
        Self { value }
    }
}

#[relm4::component]
impl SimpleComponent for App {
    type Init = ();
    type Input = AppMsg;
    type Output = ();

    view! {
        gtk::ApplicationWindow {
            set_title: Some("Entry example"),
            set_default_size: (300, 200),

           
    
    fn update(&mut self, message: Self::Input, _sender: ComponentSender<Self>) {
        match message {
            AppMsg::AddCounters => {
                let text = self.entry.text();
                if let Ok(v) = text.parse::<i32>() {
                    let mut guard = self.counters.guard();
                    if v.is_positive() {
                        // add as many counters as user entered
                        for _ in 0..v {
                            guard.push_back(self.created_counters);
                            self.created_counters += 1;
                        }
                    } else if v.is_negative() {
                        // remove counters
                        for _ in v..0 {
                            guard.pop_front();
                        }
                    }

                    // clearing the entry value clears the entry widget
                    self.entry.set_text("");
                }
            }
            AppMsg::Clicked(index) => {
                if let Some(counter) = self.counters.guard().get_mut(index.current_index()) {
                    counter.value = counter.value.wrapping_sub(1);
                }
            }
        }
    }