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helix/helix-tui/tests/widgets_paragraph.rs

221 lines
7.7 KiB
Rust

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use helix_tui::{
backend::TestBackend,
buffer::Buffer,
layout::Alignment,
text::{Span, Spans, Text},
widgets::{Block, Borders, Paragraph, Wrap},
Terminal,
};
const SAMPLE_STRING: &str = "The library is based on the principle of immediate rendering with \
intermediate buffers. This means that at each new frame you should build all widgets that are \
supposed to be part of the UI. While providing a great flexibility for rich and \
interactive UI, this may introduce overhead for highly dynamic content.";
#[test]
fn widgets_paragraph_can_wrap_its_content() {
let test_case = |alignment, expected| {
let backend = TestBackend::new(20, 10);
let mut terminal = Terminal::new(backend).unwrap();
terminal
.draw(|f| {
let size = f.size();
let text = vec![Spans::from(SAMPLE_STRING)];
let paragraph = Paragraph::new(text)
.block(Block::default().borders(Borders::ALL))
.alignment(alignment)
.wrap(Wrap { trim: true });
f.render_widget(paragraph, size);
})
.unwrap();
terminal.backend().assert_buffer(&expected);
};
test_case(
Alignment::Left,
Buffer::with_lines(vec![
"",
"The library is ",
"based on the ",
"principle of ",
"immediate ",
"rendering with ",
"intermediate ",
"buffers. This ",
"means that at each",
"",
]),
);
test_case(
Alignment::Right,
Buffer::with_lines(vec![
"",
" The library is",
" based on the",
" principle of",
" immediate",
" rendering with",
" intermediate",
" buffers. This",
"means that at each",
"",
]),
);
test_case(
Alignment::Center,
Buffer::with_lines(vec![
"",
" The library is ",
" based on the ",
" principle of ",
" immediate ",
" rendering with ",
" intermediate ",
" buffers. This ",
"means that at each",
"",
]),
);
}
#[test]
fn widgets_paragraph_renders_double_width_graphemes() {
let backend = TestBackend::new(10, 10);
let mut terminal = Terminal::new(backend).unwrap();
let s = "";
terminal
.draw(|f| {
let size = f.size();
let text = vec![Spans::from(s)];
let paragraph = Paragraph::new(text)
.block(Block::default().borders(Borders::ALL))
.wrap(Wrap { trim: true });
f.render_widget(paragraph, size);
})
.unwrap();
let expected = Buffer::with_lines(vec![
"",
"",
"",
"",
"",
"",
"",
"",
"",
"",
]);
terminal.backend().assert_buffer(&expected);
}
#[test]
fn widgets_paragraph_renders_mixed_width_graphemes() {
let backend = TestBackend::new(10, 7);
let mut terminal = Terminal::new(backend).unwrap();
let s = "a";
terminal
.draw(|f| {
let size = f.size();
let text = vec![Spans::from(s)];
let paragraph = Paragraph::new(text)
.block(Block::default().borders(Borders::ALL))
.wrap(Wrap { trim: true });
f.render_widget(paragraph, size);
})
.unwrap();
let expected = Buffer::with_lines(vec![
// The internal width is 8 so only 4 slots for double-width characters.
"",
"a ", // Here we have 1 latin character so only 3 double-width ones can fit.
"",
"",
"",
" ",
"",
]);
terminal.backend().assert_buffer(&expected);
}
#[test]
fn widgets_paragraph_can_wrap_with_a_trailing_nbsp() {
let nbsp: &str = "\u{00a0}";
let line = Spans::from(vec![Span::raw("NBSP"), Span::raw(nbsp)]);
let backend = TestBackend::new(20, 3);
let mut terminal = Terminal::new(backend).unwrap();
let expected = Buffer::with_lines(vec![
"",
"NBSP\u{00a0} ",
"",
]);
terminal
.draw(|f| {
let size = f.size();
let paragraph = Paragraph::new(line).block(Block::default().borders(Borders::ALL));
f.render_widget(paragraph, size);
})
.unwrap();
terminal.backend().assert_buffer(&expected);
}
#[test]
fn widgets_paragraph_can_scroll_horizontally() {
let test_case = |alignment, scroll, expected| {
let backend = TestBackend::new(20, 10);
let mut terminal = Terminal::new(backend).unwrap();
terminal
.draw(|f| {
let size = f.size();
let text = Text::from(
"\nParagraph can scroll horizontally!\nShort line",
);
let paragraph = Paragraph::new(text)
.block(Block::default().borders(Borders::ALL))
.alignment(alignment)
.scroll(scroll);
f.render_widget(paragraph, size);
})
.unwrap();
terminal.backend().assert_buffer(&expected);
};
test_case(
Alignment::Left,
(0, 7),
Buffer::with_lines(vec![
"",
"",
"ph can scroll hori",
"ine ",
" ",
" ",
" ",
" ",
" ",
"",
]),
);
// only support Alignment::Left
test_case(
Alignment::Right,
(0, 7),
Buffer::with_lines(vec![
"",
"",
"Paragraph can scro",
" Short line",
" ",
" ",
" ",
" ",
" ",
"",
]),
);
}