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use helix_tui::{
backend::TestBackend,
buffer::Buffer,
layout::Rect,
style::{Color, Style},
symbols,
widgets::{Block, Borders, List, ListItem, ListState},
Terminal,
};
#[test]
fn widgets_list_should_highlight_the_selected_item() {
let backend = TestBackend::new(10, 3);
let mut terminal = Terminal::new(backend).unwrap();
let mut state = ListState::default();
state.select(Some(1));
terminal
.draw(|f| {
let size = f.size();
let items = vec![
ListItem::new("Item 1"),
ListItem::new("Item 2"),
ListItem::new("Item 3"),
];
let list = List::new(items)
.highlight_style(Style::default().bg(Color::Yellow))
.highlight_symbol(">> ");
f.render_stateful_widget(list, size, &mut state);
})
.unwrap();
let mut expected = Buffer::with_lines(vec![" Item 1 ", ">> Item 2 ", " Item 3 "]);
for x in 0..10 {
expected.get_mut(x, 1).set_bg(Color::Yellow);
}
terminal.backend().assert_buffer(&expected);
}
#[test]
fn widgets_list_should_truncate_items() {
let backend = TestBackend::new(10, 2);
let mut terminal = Terminal::new(backend).unwrap();
struct TruncateTestCase<'a> {
selected: Option<usize>,
items: Vec<ListItem<'a>>,
expected: Buffer,
}
let cases = vec![
// An item is selected
TruncateTestCase {
selected: Some(0),
items: vec![
ListItem::new("A very long line"),
ListItem::new("A very long line"),
],
expected: Buffer::with_lines(vec![
format!(">> A ve{} ", symbols::line::VERTICAL),
format!(" A ve{} ", symbols::line::VERTICAL),
]),
},
// No item is selected
TruncateTestCase {
selected: None,
items: vec![
ListItem::new("A very long line"),
ListItem::new("A very long line"),
],
expected: Buffer::with_lines(vec![
format!("A very {} ", symbols::line::VERTICAL),
format!("A very {} ", symbols::line::VERTICAL),
]),
},
];
for case in cases {
let mut state = ListState::default();
state.select(case.selected);
terminal
.draw(|f| {
let list = List::new(case.items.clone())
.block(Block::default().borders(Borders::RIGHT))
.highlight_symbol(">> ");
f.render_stateful_widget(list, Rect::new(0, 0, 8, 2), &mut state);
})
.unwrap();
terminal.backend().assert_buffer(&case.expected);
}
}
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