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//! A window is an abstraction for the UI. Buffers (like [Threads]) draw "to" windows.
use std::io::Write;
use termion::{color, cursor};
use unicode_segmentation::UnicodeSegmentation;
#[derive(Clone, Copy)]
pub struct Area {
pub x: u16,
pub y: u16,
pub w: u16,
pub h: u16,
}
pub enum Line {
Normal(String),
Highlight(String),
}
pub fn truncate_dots(s: &str, to: usize) -> String {
let graphemes = s.graphemes(true).collect::<Vec<_>>();
if graphemes.len() >= to {
format!("{}...", graphemes.iter().take(to - 3).fold(String::new(), |acc, s| format!("{}{}", acc, s)))
} else {
graphemes.join("")
}
}
pub struct Window {
pub lines: Vec<Line>,
scroll: usize,
}
impl Window {
pub fn new() -> Self {
Self {
lines: Vec::new(),
scroll: 0,
}
}
pub fn draw<W: Write>(&mut self, out: &mut W, area: Area) -> Result<(), std::io::Error> {
let mut y = area.y;
let mut lines = self.lines.iter().skip(self.scroll);
while y < area.h + 1 {
match lines.next() {
Some(line) => {
write!(out, "{}", cursor::Goto(area.x, y))?;
match line {
Line::Normal(s) => write!(out, "{}", truncate_dots(s, area.w as usize))?,
Line::Highlight(s) => write!(
out,
"{}{}{}",
color::Fg(color::Red),
truncate_dots(s, area.w as usize),
color::Fg(color::Reset),
)?,
}
y += 1;
}
None => break,
}
}
out.flush()?;
self.lines.clear();
Ok(())
}
pub fn scroll_down(&mut self, until: usize) {
if self.scroll < until - 1 {
self.scroll += 1;
}
}
pub fn scroll_up(&mut self) {
if self.scroll != 0 {
self.scroll -= 1;
}
}
}
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