0056-Tui-简单进度条

环境

• Time 2022-08-11
• Rust 1.62.0
• Tui 0.18.0

前言

说明

参考：https://github.com/fdehau/tui-rs/blob/master/examples/gauge.rs

目标

使用 tui-rs 显示进度条。

定义数据

struct App {
    progress1: u16,
}

impl App {
    fn new() -> App {
        App { progress1: 0 }
    }

    fn on_tick(&mut self) {
        self.progress1 += 1;
        if self.progress1 > 100 {
            self.progress1 = 0;
        }
    }
}

渲染进度条

fn ui<B: Backend>(frame: &mut Frame<B>, app: &App) {
    let gauge = widgets::Gauge::default()
        .block(Block::default().title("进度条").borders(Borders::ALL))
        .gauge_style(Style::default().fg(Color::Yellow))
        .percent(app.progress1);
    frame.render_widget(gauge, frame.size());
}

总结

使用 tui-rs 渲染进度条。

附录

源码

use anyhow::{Context, Result};
use crossterm::{event, terminal, ExecutableCommand};
use style::{Color, Style};
use tui::backend::{Backend, CrosstermBackend};
use tui::{style, widgets, Frame, Terminal};
use widgets::{Block, Borders};

pub fn main() -> Result<()> {
    terminal::enable_raw_mode()?;
    let mut backend = CrosstermBackend::new(std::io::stdout());
    backend
        .execute(terminal::EnterAlternateScreen)?
        .execute(terminal::Clear(terminal::ClearType::All))?
        .hide_cursor()?;
    let mut terminal = tui::Terminal::new(backend)?;
    run(&mut terminal)?;
    terminal::disable_raw_mode()?;
    terminal
        .backend_mut()
        .execute(terminal::Clear(terminal::ClearType::All))?
        .execute(terminal::LeaveAlternateScreen)?
        .show_cursor()
        .context("重置控制台失败")
}

fn run<B: Backend>(terminal: &mut Terminal<B>) -> Result<()> {
    let timeout = std::time::Duration::from_millis(500);
    let mut app = App::new();
    loop {
        terminal.draw(|frame| ui(frame, &app))?;

        if event::poll(timeout)? {
            if let event::Event::Key(key) = event::read()? {
                use event::KeyCode::{Char, Esc};
                match key.code {
                    Char('q') | Char('Q') | Esc => return Ok(()),
                    _ => {}
                }
            }
        }
        app.on_tick();
    }
}
struct App {
    progress1: u16,
}

impl App {
    fn new() -> App {
        App { progress1: 0 }
    }

    fn on_tick(&mut self) {
        self.progress1 += 1;
        if self.progress1 > 100 {
            self.progress1 = 0;
        }
    }
}

fn ui<B: Backend>(frame: &mut Frame<B>, app: &App) {
    let gauge = widgets::Gauge::default()
        .block(Block::default().title("进度条").borders(Borders::ALL))
        .gauge_style(Style::default().fg(Color::Yellow))
        .percent(app.progress1);
    frame.render_widget(gauge, frame.size());
}