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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))?;
```
76 lines
2.7 KiB
Rust
76 lines
2.7 KiB
Rust
//! # [Ratatui] `BarChart` 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::{Constraint, Layout, Rect};
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use ratatui::style::Stylize;
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use ratatui::text::{Line, Span};
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use ratatui::widgets::{Bar, BarChart};
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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 a title and two barcharts.
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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::Length(28), Constraint::Fill(1)]).spacing(1);
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let [top, main] = vertical.areas(frame.area());
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let [left, right] = horizontal.areas(main);
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let title = Line::from_iter([
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Span::from("BarChart 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_vertical_barchart(frame, left);
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render_horizontal_barchart(frame, right);
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}
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/// Render a horizontal barchart with some sample data.
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fn render_horizontal_barchart(frame: &mut Frame, area: Rect) {
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let bars = vec![
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Bar::with_label("Red", 30).red(),
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Bar::with_label("Blue", 20).blue(),
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Bar::with_label("Green", 15).green(),
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Bar::with_label("Yellow", 10).yellow(),
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];
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let chart = BarChart::horizontal(bars).bar_width(3);
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frame.render_widget(chart, area);
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}
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/// Render a vertical barchart with some sample data.
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fn render_vertical_barchart(frame: &mut Frame, area: Rect) {
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let bars = vec![
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Bar::with_label("Red", 30).red(),
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Bar::with_label("Blue", 20).blue(),
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Bar::with_label("Green", 15).green(),
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Bar::with_label("Yellow", 10).yellow(),
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];
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let chart = BarChart::vertical(bars).bar_width(6);
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frame.render_widget(chart, area);
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}
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