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use cursive::traits::*;
use cursive::view::{Offset, Position};
use cursive::views::{Dialog, OnEventView, TextView};
use cursive::Cursive;
// This example modifies a view after creation.
fn main() {
let mut siv = cursive::default();
let content = "Press Q to quit the application.\n\nPress P to open the \
popup.";
siv.add_global_callback('q', |s| s.quit());
// Let's wrap the view to give it a recognizable name, so we can look for it.
// We add the P callback on the textview only (and not globally),
// so that we can't call it when the popup is already visible.
siv.add_layer(
OnEventView::new(TextView::new(content).with_name("text"))
.on_event('p', |s| show_popup(s)),
);
siv.run();
}
fn show_popup(siv: &mut Cursive) {
// Let's center the popup horizontally, but offset it down a few rows,
// so the user can see both the popup and the view underneath.
siv.screen_mut().add_layer_at(
Position::new(Offset::Center, Offset::Parent(5)),
Dialog::around(TextView::new("Tak!"))
.button("Change", |s| {
// Look for a view tagged "text".
// We _know_ it's there, so unwrap it.
s.call_on_name("text", |view: &mut TextView| {
let content = reverse(view.get_content().source());
view.set_content(content);
});
})
.dismiss_button("Ok"),
);
}
// This just reverses each character
//
// Note: it would be more correct to iterate on graphemes instead.
// Check the unicode_segmentation crate!
fn reverse(text: &str) -> String {
text.chars().rev().collect()
}