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use tui::buffer::Buffer;
use tui::layout::Rect;
use tui::style::{Color, Style};
use tui::widgets::Widget;
use unicode_width::{UnicodeWidthChar, UnicodeWidthStr};
#[derive(Clone, Debug)]
pub struct LineInfo {
pub start: usize,
pub end: usize,
pub width: usize,
}
pub struct TuiMultilineText<'a> {
_s: &'a str,
_width: usize,
_lines: Vec<LineInfo>,
_style: Style,
}
impl<'a> TuiMultilineText<'a> {
pub fn new(s: &'a str, area_width: usize) -> Self {
// TODO: This is a very hacky way of doing it and I would like
// to clean this up more
let default_style = Style::default().fg(Color::Reset).bg(Color::Reset);
let s_width = s.width();
if s_width < area_width {
return Self {
_s: s,
_lines: vec![LineInfo {
start: 0,
end: s.len(),
width: s_width,
}],
_width: area_width,
_style: default_style,
};
}
let filter = |(i, c): (usize, char)| {
let w = c.width()?;
Some((i, c, w))
};
let mut lines = Vec::with_capacity(s.len() / area_width);
let mut start = 0;
let mut line_width = 0;
for (i, _, w) in s.char_indices().filter_map(filter) {
if line_width + w < area_width {
line_width += w;
continue;
}
lines.push(LineInfo {
start,
end: i,
width: line_width,
});
line_width = w;
start = i;
}
lines.push(LineInfo {
start,
end: s.len(),
width: s[start..s.len()].width(),
});
Self {
_s: s,
_lines: lines,
_width: area_width,
_style: default_style,
}
}
pub fn width(&self) -> usize {
self._width
}
pub fn height(&self) -> usize {
if self._lines[self._lines.len() - 1].width >= self.width() {
return self.len() + 1;
}
self.len()
}
pub fn len(&self) -> usize {
self._lines.len()
}
pub fn iter(&self) -> impl Iterator<Item = &LineInfo> {
self._lines.iter()
}
}
impl<'a> Widget for TuiMultilineText<'a> {
fn render(self, area: Rect, buf: &mut Buffer) {
let area_left = area.left();
let area_top = area.top();
for (i, line_info) in self.iter().enumerate() {
buf.set_string(
area_left,
area_top + i as u16,
&self._s[line_info.start..line_info.end],
self._style,
);
}
}
}
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