83 lines
2.6 KiB
Rust
83 lines
2.6 KiB
Rust
use crossterm::event::Event;
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use crossterm::style::Stylize;
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use toss::{Frame, Pos, Style, Terminal};
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fn draw(f: &mut Frame) {
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f.write(
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Pos::new(0, 0),
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"Writing over wide graphemes removes the entire overwritten grapheme.",
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);
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let under = Style::new().white().on_dark_blue();
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let over = Style::new().black().on_dark_yellow();
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for i in 0..6 {
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let delta = i - 2;
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f.write(Pos::new(2 + i * 7, 2), ("a😀", under));
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f.write(Pos::new(2 + i * 7, 3), ("a😀", under));
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f.write(Pos::new(2 + i * 7, 4), ("a😀", under));
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f.write(Pos::new(2 + i * 7 + delta, 3), ("b", over));
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f.write(Pos::new(2 + i * 7 + delta, 4), ("😈", over));
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}
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f.write(
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Pos::new(0, 6),
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"Wide graphemes at the edges of the screen apply their style, but are not",
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);
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f.write(Pos::new(0, 7), "actually rendered.");
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let x1 = -1;
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let x2 = f.size().width as i32 / 2 - 3;
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let x3 = f.size().width as i32 - 5;
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f.write(Pos::new(x1, 9), ("123456", under));
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f.write(Pos::new(x1, 10), ("😀😀😀", under));
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f.write(Pos::new(x2, 9), ("123456", under));
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f.write(Pos::new(x2, 10), ("😀😀😀", under));
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f.write(Pos::new(x3, 9), ("123456", under));
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f.write(Pos::new(x3, 10), ("😀😀😀", under));
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let scientist = "👩🔬";
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f.write(
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Pos::new(0, 12),
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"Most terminals ignore the zero width joiner and display this female",
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);
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f.write(
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Pos::new(0, 13),
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"scientist emoji as a woman and a microscope: 👩🔬",
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);
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for i in 0..(f.widthdb().width(scientist) + 4) {
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f.write(Pos::new(2, 15 + i as i32), (scientist, under));
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f.write(Pos::new(i as i32, 15 + i as i32), ("x", over));
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}
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}
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fn render_frame(term: &mut Terminal) {
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loop {
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// Must be called before rendering, otherwise the terminal has out-of-date
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// size information and will present garbage.
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term.autoresize().unwrap();
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draw(term.frame());
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term.present().unwrap();
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if term.measuring_required() {
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term.measure_widths().unwrap();
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} else {
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break;
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}
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}
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}
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fn main() {
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// Automatically enters alternate screen and enables raw mode
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let mut term = Terminal::new().unwrap();
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term.set_measuring(true);
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loop {
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// Render and display a frame. A full frame is displayed on the terminal
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// once this function exits.
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render_frame(&mut term);
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// Exit if the user presses any buttons
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if !matches!(crossterm::event::read().unwrap(), Event::Resize(_, _)) {
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break;
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}
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}
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}
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