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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)?;
```
127 lines
4.4 KiB
Rust
127 lines
4.4 KiB
Rust
//! # [Ratatui] `Scrollbar` 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::{self, KeyCode};
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use ratatui::Frame;
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use ratatui::layout::{Constraint, Layout, Margin, Rect};
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use ratatui::style::{Color, Stylize};
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use ratatui::symbols::scrollbar::Set;
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use ratatui::text::{Line, Span};
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use ratatui::widgets::{Paragraph, Scrollbar, ScrollbarOrientation, ScrollbarState};
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fn main() -> Result<()> {
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color_eyre::install()?;
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let mut vertical = ScrollbarState::new(100);
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let mut horizontal = ScrollbarState::new(100);
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ratatui::run(|terminal| {
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loop {
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terminal.draw(|frame| render(frame, &mut vertical, &mut horizontal))?;
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if let Some(key) = event::read()?.as_key_press_event() {
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match key.code {
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KeyCode::Char('q') | KeyCode::Esc => break Ok(()),
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KeyCode::Char('j') | KeyCode::Down => vertical.next(),
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KeyCode::Char('k') | KeyCode::Up => vertical.prev(),
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KeyCode::Char('l') | KeyCode::Right => horizontal.next(),
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KeyCode::Char('h') | KeyCode::Left => horizontal.prev(),
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_ => {}
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}
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}
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}
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})
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}
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/// Render the UI with vertical/horizontal scrollbars.
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fn render(frame: &mut Frame, vertical: &mut ScrollbarState, horizontal: &mut ScrollbarState) {
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let layout = Layout::vertical([Constraint::Length(1), Constraint::Fill(1)]).spacing(1);
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let [top, main] = frame.area().layout(&layout);
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let title = Line::from_iter([
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Span::from("Scrollbar Widget").bold(),
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Span::from(" (Press 'q' to quit, arrow keys to scroll)"),
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]);
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frame.render_widget(title.centered(), top);
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render_content(frame, main, vertical, horizontal);
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render_vertical_scrollbar(frame, main, vertical);
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render_horizontal_scrollbar(frame, main, horizontal);
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}
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/// Render a vertical scrollbar on the right side of the area.
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pub fn render_vertical_scrollbar(frame: &mut Frame, area: Rect, vertical: &mut ScrollbarState) {
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let scrollbar = Scrollbar::new(ScrollbarOrientation::VerticalRight);
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frame.render_stateful_widget(
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scrollbar,
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area.inner(Margin {
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vertical: 1,
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horizontal: 0,
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}),
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vertical,
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);
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}
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/// Render a horizontal scrollbar at the bottom of the area.
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pub fn render_horizontal_scrollbar(frame: &mut Frame, area: Rect, horizontal: &mut ScrollbarState) {
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let scrollbar = Scrollbar::new(ScrollbarOrientation::HorizontalBottom)
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.symbols(Set {
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track: "-",
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thumb: "▮",
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begin: "<",
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end: ">",
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})
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.track_style(Color::Yellow)
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.begin_style(Color::Green)
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.end_style(Color::Red);
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frame.render_stateful_widget(
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scrollbar,
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area.inner(Margin {
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vertical: 0,
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horizontal: 1,
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}),
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horizontal,
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);
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}
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/// Render some content.
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fn render_content(
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frame: &mut Frame,
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area: Rect,
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vertical: &ScrollbarState,
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horizontal: &ScrollbarState,
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) {
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let content = vec![
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Line::from("This is a paragraph with a vertical and horizontal scrollbar."),
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Line::from_iter(["Lorem ipsum dolor sit amet, consectetur adipiscing elit.".repeat(10)]),
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Line::from_iter([
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"Horizontal: ".bold(),
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horizontal.get_position().to_string().yellow(),
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]),
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Line::from_iter([
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"Vertical: ".bold(),
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vertical.get_position().to_string().yellow(),
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]),
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];
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frame.render_widget(
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Paragraph::new(content).scroll((
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vertical.get_position() as u16,
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horizontal.get_position() as u16,
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)),
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area,
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);
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}
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