select.rs

use cursive::align::HAlign;
use cursive::event::EventResult;
use cursive::traits::*;
use cursive::views::{Dialog, OnEventView, SelectView, TextView};
use cursive::Cursive;

// We'll use a SelectView here.
//
// A SelectView is a scrollable list of items, from which the user can select
// one.

fn main() {
    let mut select = SelectView::new()
        // Center the text horizontally
        .h_align(HAlign::Center)
        // Use keyboard to jump to the pressed letters
        .autojump();

    // Read the list of cities from separate file, and fill the view with it.
    // (We include the file at compile-time to avoid runtime read errors.)
    let content = include_str!("assets/cities.txt");
    select.add_all_str(content.lines());

    // Sets the callback for when "Enter" is pressed.
    select.set_on_submit(show_next_window);

    // Let's override the `j` and `k` keys for navigation
    let select = OnEventView::new(select)
        .on_pre_event_inner('k', |s, _| {
            let cb = s.select_up(1);
            Some(EventResult::Consumed(Some(cb)))
        })
        .on_pre_event_inner('j', |s, _| {
            let cb = s.select_down(1);
            Some(EventResult::Consumed(Some(cb)))
        });

    let mut siv = cursive::default();

    // Let's add a ResizedView to keep the list at a reasonable size
    // (it can scroll anyway).
    siv.add_layer(
        Dialog::around(select.scrollable().fixed_size((20, 10))).title("Where are you from?"),
    );

    siv.run();
}

// Let's put the callback in a separate function to keep it clean,
// but it's not required.
fn show_next_window(siv: &mut Cursive, city: &str) {
    siv.pop_layer();
    let text = format!("{city} is a great city!");
    siv.add_layer(Dialog::around(TextView::new(text)).button("Quit", |s| s.quit()));
}