0051-Tui-按键控制

环境

• Time 2022-08-09
• Rust 1.62.0
• Tui 0.18.0

前言

说明

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

目标

使用 tui-rs 来控制终端的按键，通过不同的按键退出终端。

分离终端初始化

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")
}

按键控制

fn run<B: Backend>(terminal: &mut Terminal<B>) -> Result<()> {
    loop {
        terminal.draw(ui)?;

        if let event::Event::Key(key) = event::read()? {
            use event::KeyCode::{Char, Esc};
            match key.code {
                Char('q') | Char('Q') | Esc => return Ok(()),
                _ => {}
            }
        }
    }
}

渲染圆角主方块

fn ui<B: Backend>(frame: &mut Frame<B>) {
    let block = widgets::Block::default()
        .title("圆角主方块")
        .title_alignment(layout::Alignment::Center)
        .borders(widgets::Borders::ALL)
        .border_type(widgets::BorderType::Rounded);

    frame.render_widget(block, frame.size());
}

总结

使用 tui-rs 渲染了一个居中的圆角的主方块，并且可以使用按键终止程序。

附录

源码

use anyhow::{Context, Result};
use crossterm::{event, terminal, ExecutableCommand};
use tui::backend::{Backend, CrosstermBackend};
use tui::{layout, widgets, Frame, Terminal};

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<()> {
    loop {
        terminal.draw(ui)?;

        if let event::Event::Key(key) = event::read()? {
            use event::KeyCode::{Char, Esc};
            match key.code {
                Char('q') | Char('Q') | Esc => return Ok(()),
                _ => {}
            }
        }
    }
}

fn ui<B: Backend>(frame: &mut Frame<B>) {
    let block = widgets::Block::default()
        .title("圆角主方块")
        .title_alignment(layout::Alignment::Center)
        .borders(widgets::Borders::ALL)
        .border_type(widgets::BorderType::Rounded);

    frame.render_widget(block, frame.size());
}