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 ID, 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_id("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_id("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() }