mirror of
https://github.com/ratatui/ratatui.git
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6dcd53bc6b
This commit introduces new methods for the `Rect` struct that simplify
the process of splitting a `Rect` into sub-rects according to a given
`Layout`. By putting these methods on the `Rect` struct, we make it a
bit more natural that a layout is applied to the `Rect` itself, rather
than passing a `Rect` to the `Layout` struct to be split.
Adds:
- `Rect::layout` and `Rect::try_layout` methods that allow splitting a
`Rect` into an array of sub-rects according to a given `Layout`.
- `Rect::layout_vec` method that returns a `Vec` of sub-rects.
- `Layout::try_areas` method that returns an array of sub-rects, with
compile-time checks for the number of constraints. This is added
mainly for consistency with the new `Rect` methods.
```rust
use ratatui_core::layout::{Layout, Constraint, Rect};
let area = Rect::new(0, 0, 10, 10);
let layout = Layout::vertical([Constraint::Fill(1); 2]);
// Rect::layout() infers the number of constraints at compile time:
let [top, main] = area.layout(&layout);
// Rect::try_layout() and Layout::try_areas() do the same, but return a
// Result:
let [top, main] = area.try_layout(&layout)?;
let [top, main] = layout.try_areas(area)?;
// Rect::layout_vec() returns a Vec of sub-rects:
let areas_vec = area.layout_vec(&layout);
// you can also explicitly specify the number of constraints:
let areas = area.layout::<2>(&layout);
let areas = area.try_layout::<2>(&layout)?;
let areas = layout.try_areas::<2>(area)?;
```
96 lines
3.2 KiB
Rust
96 lines
3.2 KiB
Rust
//! # [Ratatui] `BarChart` example with grouped bars
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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 core::iter::zip;
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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, Direction, Layout, Rect};
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use ratatui::style::{Color, Stylize};
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use ratatui::text::{Line, Span};
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use ratatui::widgets::{Bar, BarChart, BarGroup};
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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 barchart on the left and right side.
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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::Fill(1); 2]).spacing(1);
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let [top, main] = frame.area().layout(&vertical);
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let [left, right] = main.layout(&horizontal);
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let title = Line::from_iter([
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Span::from("BarChart Widget (Grouped)").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_barchart(frame, left, Direction::Vertical, 6);
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render_barchart(frame, right, Direction::Horizontal, 1);
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}
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/// Render a barchart with grouped bars.
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fn render_barchart(frame: &mut Frame, area: Rect, direction: Direction, bar_width: u16) {
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let companies = [
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("BITE", Color::Blue),
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("TART", Color::White),
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("BAKE", Color::LightRed),
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];
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let revenues = [
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("Jan", [8500, 6500, 7000]),
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("Feb", [9000, 7500, 8500]),
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("Mar", [9500, 4500, 8200]),
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("Apr", [6300, 4000, 5000]),
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];
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let mut barchart = BarChart::default()
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.bar_gap(0)
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.bar_width(bar_width)
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.group_gap(2)
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.direction(direction);
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for (period, values) in revenues {
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let bars: Vec<_> = zip(companies, values)
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.map(|((label, color), value)| bar(label, value, color))
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.collect();
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let label = Line::from(period).centered();
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let group = BarGroup::new(bars).label(label);
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barchart = barchart.data(group);
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}
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frame.render_widget(barchart, area);
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}
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/// Return a bar with the given label, value, and color.
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fn bar(label: &str, value: u64, color: Color) -> Bar<'_> {
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Bar::default()
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.label(label)
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.value(value)
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.text_value(format!("{:.1}M", value as f64 / 1000.))
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.style(color)
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.value_style((Color::Black, color))
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}
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