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7bc78bca1b
This introduces a new `ratatui::run()` method which runs a closure with
a terminal initialized with reasonable defaults for most applications.
This calls `ratatui::init()` before running the closure and
`ratatui::restore()` after the closure completes, and returns the result
of the closure.
A minimal hello world example using the new `ratatui::run()` method:
```rust
fn main() -> Result<(), Box<dyn std::error::Error>> {
ratatui::run(|terminal| {
loop {
terminal.draw(|frame| frame.render_widget("Hello World!", frame.area()))?;
if crossterm::event::read()?.is_key_press() {
break Ok(());
}
}
})
}
```
Of course, this also works both with apps that use free methods and
structs:
```rust
fn run(terminal: &mut DefaultTerminal) -> Result<(), AppError> { ... }
ratatui::run(run)?;
```
```rust
struct App { ... }
impl App {
fn new() -> Self { ... }
fn run(mut self, terminal: &mut DefaultTerminal) -> Result<(), AppError> { ... }
}
ratatui::run(|terminal| App::new().run(terminal))?;
```
95 lines
3.2 KiB
Rust
95 lines
3.2 KiB
Rust
//! # [Ratatui] `Paragraph` example
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//!
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//! The latest version of this example is available in the [widget examples] folder in the
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//! 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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//! [widget examples]: https://github.com/ratatui/ratatui/blob/main/ratatui-widgets/examples
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//! [examples readme]: https://github.com/ratatui/ratatui/blob/main/examples/README.md
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use color_eyre::Result;
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use crossterm::event;
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use ratatui::Frame;
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use ratatui::layout::{Alignment, Constraint, Layout, Rect};
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use ratatui::style::{Color, Stylize};
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use ratatui::text::{Line, Masked, Span};
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use ratatui::widgets::{Paragraph, Wrap};
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fn main() -> Result<()> {
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color_eyre::install()?;
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ratatui::run(|terminal| {
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loop {
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terminal.draw(render)?;
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if event::read()?.is_key_press() {
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break Ok(());
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}
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}
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})
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}
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/// Render the UI with various text.
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fn render(frame: &mut Frame) {
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let vertical = Layout::vertical([Constraint::Length(1), Constraint::Fill(1)]).spacing(1);
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let horizontal = Layout::horizontal([Constraint::Percentage(50); 2]).spacing(1);
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let [top, main] = vertical.areas(frame.area());
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let [first, second] = horizontal.areas(main);
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let title = Line::from_iter([
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Span::from("Paragraph Widget").bold(),
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Span::from(" (Press 'q' to quit)"),
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]);
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frame.render_widget(title.centered(), top);
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render_centered_paragraph(frame, first);
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render_wrapped_paragraph(frame, second);
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}
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/// Render a paragraph with centered text.
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pub fn render_centered_paragraph(frame: &mut Frame, area: Rect) {
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let text = "Centered text\nwith multiple lines.\nCheck out the recipe!";
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let paragraph = Paragraph::new(text)
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.style(Color::White)
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.alignment(Alignment::Center);
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frame.render_widget(paragraph, area);
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}
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/// Render a long paragraph that wraps text.
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pub fn render_wrapped_paragraph(frame: &mut Frame, area: Rect) {
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let paragraph = Paragraph::new(create_lines(area))
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.style(Color::White)
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.scroll((0, 0))
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.wrap(Wrap { trim: true });
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frame.render_widget(paragraph, area);
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}
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/// Returns the lines for the paragraph.
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fn create_lines(area: Rect) -> Vec<Line<'static>> {
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let short_line = "Slice, layer, and bake the vegetables. ";
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let long_line = short_line.repeat((area.width as usize) / short_line.len() + 2);
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vec![
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"Recipe: Ratatouille".into(),
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"Ingredients:".bold().into(),
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Line::from_iter([
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"Bell Peppers".into(),
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", Eggplant".italic(),
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", Tomatoes".bold(),
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", Onion".into(),
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]),
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Line::from_iter([
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"Secret Ingredient: ".underlined(),
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Span::styled(Masked::new("herbs de Provence", '*'), Color::Red),
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]),
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"Instructions:".bold().yellow().into(),
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long_line.green().italic().into(),
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]
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}
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