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use crate::{app::App, ui};
use ratatui::{
Frame,
buffer::Buffer,
layout::Rect,
style::Stylize,
symbols::border,
text::{Line, Text},
widgets::{Block, Paragraph, Widget},
};
/// Explicitly declare lifetime as App is a reference;
/// Runtime is only instantiated for render
struct Runtime<'a> {
app: &'a App,
}
pub fn draw(frame: &mut Frame, app: &App) {
let run = ui::Runtime { app };
frame.render_widget(&run, frame.area());
}
impl<'a> Widget for &Runtime<'a> {
fn render(self, area: Rect, buf: &mut Buffer) {
let title = Line::from(" Counter App Tutorial ".bold());
let instructions = Line::from(vec![
" Decrement ".into(),
"<Left>".blue().bold(),
" Increment ".into(),
"<Right>".blue().bold(),
" Quit ".into(),
"<Q> ".blue().bold(),
]);
let block = Block::bordered()
.title(title.centered())
.title_bottom(instructions.centered())
.border_set(border::THICK);
let counter_text = Text::from(vec![Line::from(vec![
"Value: ".into(),
self.app.display_counter().yellow(),
])]);
Paragraph::new(counter_text)
.centered()
.block(block)
.render(area, buf);
}
}
#[cfg(test)]
mod tests {
use super::*;
use ratatui::style::Style;
#[test]
fn render() {
let mut app = App::default();
assert!(app.init_context().is_ok());
let runtime = Runtime { app: &app };
let mut buf = Buffer::empty(Rect::new(0, 0, 50, 4));
runtime.render(buf.area, &mut buf);
let mut expected = Buffer::with_lines(vec![
"┏━━━━━━━━━━━━━ Counter App Tutorial ━━━━━━━━━━━━━┓",
"┃ Value: 0 ┃",
"┃ ┃",
"┗━ Decrement <Left> Increment <Right> Quit <Q> ━━┛",
]);
let title_style = Style::new().bold();
let counter_style = Style::new().yellow();
let key_style = Style::new().blue().bold();
expected.set_style(Rect::new(14, 0, 22, 1), title_style);
expected.set_style(Rect::new(28, 1, 1, 1), counter_style);
expected.set_style(Rect::new(13, 3, 6, 1), key_style);
expected.set_style(Rect::new(30, 3, 7, 1), key_style);
expected.set_style(Rect::new(43, 3, 4, 1), key_style);
assert_eq!(buf, expected);
}
}
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