mirror of
https://github.com/ratatui-org/ratatui
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249 lines
8.9 KiB
Rust
249 lines
8.9 KiB
Rust
//! # [Ratatui] Colors example
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//!
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//! The latest version of this example is available in the [examples] folder in the repository.
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//!
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//! Please note that the examples are designed to be run against the `main` branch of the Github
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//! repository. This means that you may not be able to compile with the latest release version on
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//! crates.io, or the one that you have installed locally.
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//!
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//! See the [examples readme] for more information on finding examples that match the version of the
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//! library you are using.
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//!
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//! [Ratatui]: https://github.com/ratatui/ratatui
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//! [examples]: https://github.com/ratatui/ratatui/blob/main/examples
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//! [examples readme]: https://github.com/ratatui/ratatui/blob/main/examples/README.md
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// This example shows all the colors supported by ratatui. It will render a grid of foreground
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// and background colors with their names and indexes.
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use color_eyre::Result;
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use itertools::Itertools;
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use ratatui::{
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crossterm::event::{self, Event, KeyCode, KeyEventKind},
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layout::{Alignment, Constraint, Layout, Rect},
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style::{Color, Style, Stylize},
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text::Line,
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widgets::{Block, Borders, Paragraph},
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DefaultTerminal, Frame,
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};
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fn main() -> Result<()> {
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color_eyre::install()?;
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let terminal = ratatui::init();
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let app_result = run(terminal);
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ratatui::restore();
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app_result
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}
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fn run(mut terminal: DefaultTerminal) -> Result<()> {
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loop {
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terminal.draw(draw)?;
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if let Event::Key(key) = event::read()? {
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if key.kind == KeyEventKind::Press && key.code == KeyCode::Char('q') {
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return Ok(());
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}
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}
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}
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}
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fn draw(frame: &mut Frame) {
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let layout = Layout::vertical([
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Constraint::Length(30),
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Constraint::Length(17),
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Constraint::Length(2),
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])
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.split(frame.area());
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render_named_colors(frame, layout[0]);
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render_indexed_colors(frame, layout[1]);
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render_indexed_grayscale(frame, layout[2]);
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}
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const NAMED_COLORS: [Color; 16] = [
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Color::Black,
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Color::Red,
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Color::Green,
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Color::Yellow,
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Color::Blue,
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Color::Magenta,
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Color::Cyan,
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Color::Gray,
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Color::DarkGray,
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Color::LightRed,
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Color::LightGreen,
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Color::LightYellow,
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Color::LightBlue,
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Color::LightMagenta,
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Color::LightCyan,
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Color::White,
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];
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fn render_named_colors(frame: &mut Frame, area: Rect) {
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let layout = Layout::vertical([Constraint::Length(3); 10]).split(area);
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render_fg_named_colors(frame, Color::Reset, layout[0]);
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render_fg_named_colors(frame, Color::Black, layout[1]);
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render_fg_named_colors(frame, Color::DarkGray, layout[2]);
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render_fg_named_colors(frame, Color::Gray, layout[3]);
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render_fg_named_colors(frame, Color::White, layout[4]);
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render_bg_named_colors(frame, Color::Reset, layout[5]);
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render_bg_named_colors(frame, Color::Black, layout[6]);
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render_bg_named_colors(frame, Color::DarkGray, layout[7]);
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render_bg_named_colors(frame, Color::Gray, layout[8]);
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render_bg_named_colors(frame, Color::White, layout[9]);
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}
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fn render_fg_named_colors(frame: &mut Frame, bg: Color, area: Rect) {
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let block = title_block(format!("Foreground colors on {bg} background"));
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let inner = block.inner(area);
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frame.render_widget(block, area);
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let vertical = Layout::vertical([Constraint::Length(1); 2]).split(inner);
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let areas = vertical.iter().flat_map(|area| {
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Layout::horizontal([Constraint::Ratio(1, 8); 8])
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.split(*area)
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.to_vec()
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});
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for (fg, area) in NAMED_COLORS.into_iter().zip(areas) {
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let color_name = fg.to_string();
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let paragraph = Paragraph::new(color_name).fg(fg).bg(bg);
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frame.render_widget(paragraph, area);
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}
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}
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fn render_bg_named_colors(frame: &mut Frame, fg: Color, area: Rect) {
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let block = title_block(format!("Background colors with {fg} foreground"));
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let inner = block.inner(area);
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frame.render_widget(block, area);
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let vertical = Layout::vertical([Constraint::Length(1); 2]).split(inner);
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let areas = vertical.iter().flat_map(|area| {
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Layout::horizontal([Constraint::Ratio(1, 8); 8])
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.split(*area)
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.to_vec()
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});
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for (bg, area) in NAMED_COLORS.into_iter().zip(areas) {
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let color_name = bg.to_string();
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let paragraph = Paragraph::new(color_name).fg(fg).bg(bg);
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frame.render_widget(paragraph, area);
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}
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}
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fn render_indexed_colors(frame: &mut Frame, area: Rect) {
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let block = title_block("Indexed colors".into());
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let inner = block.inner(area);
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frame.render_widget(block, area);
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let layout = Layout::vertical([
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Constraint::Length(1), // 0 - 15
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Constraint::Length(1), // blank
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Constraint::Min(6), // 16 - 123
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Constraint::Length(1), // blank
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Constraint::Min(6), // 124 - 231
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Constraint::Length(1), // blank
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])
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.split(inner);
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// 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
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let color_layout = Layout::horizontal([Constraint::Length(5); 16]).split(layout[0]);
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for i in 0..16 {
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let color = Color::Indexed(i);
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let color_index = format!("{i:0>2}");
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let bg = if i < 1 { Color::DarkGray } else { Color::Black };
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let paragraph = Paragraph::new(Line::from(vec![
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color_index.fg(color).bg(bg),
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"██".bg(color).fg(color),
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]));
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frame.render_widget(paragraph, color_layout[i as usize]);
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}
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// 16 17 18 19 20 21 52 53 54 55 56 57 88 89 90 91 92 93
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// 22 23 24 25 26 27 58 59 60 61 62 63 94 95 96 97 98 99
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// 28 29 30 31 32 33 64 65 66 67 68 69 100 101 102 103 104 105
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// 34 35 36 37 38 39 70 71 72 73 74 75 106 107 108 109 110 111
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// 40 41 42 43 44 45 76 77 78 79 80 81 112 113 114 115 116 117
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// 46 47 48 49 50 51 82 83 84 85 86 87 118 119 120 121 122 123
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//
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// 124 125 126 127 128 129 160 161 162 163 164 165 196 197 198 199 200 201
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// 130 131 132 133 134 135 166 167 168 169 170 171 202 203 204 205 206 207
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// 136 137 138 139 140 141 172 173 174 175 176 177 208 209 210 211 212 213
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// 142 143 144 145 146 147 178 179 180 181 182 183 214 215 216 217 218 219
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// 148 149 150 151 152 153 184 185 186 187 188 189 220 221 222 223 224 225
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// 154 155 156 157 158 159 190 191 192 193 194 195 226 227 228 229 230 231
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// the above looks complex but it's so the colors are grouped into blocks that display nicely
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let index_layout = [layout[2], layout[4]]
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.iter()
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// two rows of 3 columns
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.flat_map(|area| {
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Layout::horizontal([Constraint::Length(27); 3])
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.split(*area)
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.to_vec()
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})
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// each with 6 rows
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.flat_map(|area| {
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Layout::vertical([Constraint::Length(1); 6])
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.split(area)
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.to_vec()
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})
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// each with 6 columns
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.flat_map(|area| {
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Layout::horizontal([Constraint::Min(4); 6])
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.split(area)
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.to_vec()
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})
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.collect_vec();
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for i in 16..=231 {
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let color = Color::Indexed(i);
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let color_index = format!("{i:0>3}");
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let paragraph = Paragraph::new(Line::from(vec![
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color_index.fg(color).bg(Color::Reset),
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".".bg(color).fg(color),
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// There's a bug in VHS that seems to bleed backgrounds into the next
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// character. This is a workaround to make the bug less obvious.
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"███".reversed(),
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]));
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frame.render_widget(paragraph, index_layout[i as usize - 16]);
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}
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}
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fn title_block(title: String) -> Block<'static> {
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Block::new()
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.borders(Borders::TOP)
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.title_alignment(Alignment::Center)
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.border_style(Style::new().dark_gray())
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.title_style(Style::new().reset())
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.title(title)
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}
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fn render_indexed_grayscale(frame: &mut Frame, area: Rect) {
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let layout = Layout::vertical([
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Constraint::Length(1), // 232 - 243
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Constraint::Length(1), // 244 - 255
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])
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.split(area)
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.iter()
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.flat_map(|area| {
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Layout::horizontal([Constraint::Length(6); 12])
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.split(*area)
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.to_vec()
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})
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.collect_vec();
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for i in 232..=255 {
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let color = Color::Indexed(i);
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let color_index = format!("{i:0>3}");
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// make the dark colors easier to read
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let bg = if i < 244 { Color::Gray } else { Color::Black };
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let paragraph = Paragraph::new(Line::from(vec![
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color_index.fg(color).bg(bg),
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"██".bg(color).fg(color),
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// There's a bug in VHS that seems to bleed backgrounds into the next
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// character. This is a workaround to make the bug less obvious.
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"███████".reversed(),
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]));
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frame.render_widget(paragraph, layout[i as usize - 232]);
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}
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}
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