Joscha
26a8936cf5
The previous implementation of Styled used chunks that consisted of a String and a ContentStyle. The current implementation instead stores a single String and chunks consisting of a ContentStyle and an ending index. This implementation may reduce allocations and makes width-related operations easier, for example getting the width of a Styled with its whitespace trimmed.
74 lines
2.4 KiB
Rust
74 lines
2.4 KiB
Rust
use crossterm::event::Event;
|
|
use toss::frame::{Frame, Pos};
|
|
use toss::styled::Styled;
|
|
use toss::terminal::Terminal;
|
|
|
|
fn draw(f: &mut Frame) {
|
|
let text = concat!(
|
|
"This is a short paragraph in order to demonstrate unicode-aware word wrapping. ",
|
|
"Resize your terminal to different widths to try it out. ",
|
|
"After this sentence come two newlines, so it should always break here.\n",
|
|
"\n",
|
|
"Since the wrapping algorithm is aware of the Unicode Standard Annex #14, ",
|
|
"it understands things like non-breaking spaces and word joiners: ",
|
|
"This\u{00a0}sentence\u{00a0}is\u{00a0}separated\u{00a0}by\u{00a0}non-\u{2060}breaking\u{00a0}spaces.\n",
|
|
"\n",
|
|
"It can also properly handle wide graphemes (like emoji 🤔), ",
|
|
"including ones usually displayed incorrectly by terminal emulators, like 👩🔬 (a female scientist emoji).\n",
|
|
"\n",
|
|
"Finally, tabs are supported as well. ",
|
|
"The following text is rendered with a tab width of 4:\n",
|
|
"\tx\n",
|
|
"1\tx\n",
|
|
"12\tx\n",
|
|
"123\tx\n",
|
|
"1234\tx\n",
|
|
"12345\tx\n",
|
|
"123456\tx\n",
|
|
"1234567\tx\n",
|
|
"12345678\tx\n",
|
|
"123456789\tx\n",
|
|
);
|
|
|
|
let breaks = f.wrap(text, f.size().width.into());
|
|
let lines = Styled::new_plain(text).split_at_indices(&breaks);
|
|
for (i, mut line) in lines.into_iter().enumerate() {
|
|
line.trim_end();
|
|
f.write(Pos::new(0, i as i32), line);
|
|
}
|
|
}
|
|
|
|
fn render_frame(term: &mut Terminal) {
|
|
loop {
|
|
// Must be called before rendering, otherwise the terminal has out-of-date
|
|
// size information and will present garbage.
|
|
term.autoresize().unwrap();
|
|
|
|
draw(term.frame());
|
|
term.present().unwrap();
|
|
|
|
if term.measuring_required() {
|
|
term.measure_widths().unwrap();
|
|
} else {
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
fn main() {
|
|
// Automatically enters alternate screen and enables raw mode
|
|
let mut term = Terminal::new().unwrap();
|
|
term.set_measuring(true);
|
|
term.set_tab_width(4);
|
|
|
|
loop {
|
|
// Render and display a frame. A full frame is displayed on the terminal
|
|
// once this function exits.
|
|
render_frame(&mut term);
|
|
|
|
// Exit if the user presses any buttons
|
|
if !matches!(crossterm::event::read().unwrap(), Event::Resize(_, _)) {
|
|
break;
|
|
}
|
|
}
|
|
}
|