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use std::{sync::Arc, time::Duration};
use super::app::AppActions;
use crate::interactive::component::{Component, Frame};
use futures_timer::Delay;
use parking_lot::Mutex;
use tui::{
layout::{Alignment, Rect},
widgets::Paragraph,
};
#[derive(Clone)]
pub struct LoadingIndicator {
phase: Arc<Mutex<U3>>,
}
impl LoadingIndicator {
pub fn new(actions: AppActions) -> Self {
let phase = Arc::new(Mutex::new(U3::default()));
Self::cycle(actions, phase.clone());
Self { phase }
}
fn cycle(actions: AppActions, phase: Arc<Mutex<U3>>) {
tokio::spawn(async move {
loop {
Delay::new(Duration::from_millis(100)).await;
phase.lock().increment();
actions.redraw_async().await;
}
});
}
fn push_str_if(string: &mut String, to_push: &str, condition: bool) {
if condition {
string.push_str(&to_push);
} else {
let to_push = format!("{:width$}", " ", width = to_push.len());
string.push_str(&to_push);
}
}
}
impl Component for LoadingIndicator {
fn draw(&mut self, f: &mut Frame<'_>, area: Rect) {
let phase = self.phase.lock().value();
let mut text = String::new();
Self::push_str_if(&mut text, "__", phase < 3);
text.push_str("\n");
Self::push_str_if(&mut text, "/", phase > 4 || phase < 2);
text.push_str(" ");
Self::push_str_if(&mut text, "\\", phase > 1 && phase < 4);
text.push_str("\n");
Self::push_str_if(&mut text, "\\", phase > 3 || phase < 1);
Self::push_str_if(&mut text, "__", phase > 3);
Self::push_str_if(&mut text, "/", phase > 2 && phase < 5);
let value = Paragraph::new(text).alignment(Alignment::Center);
f.render_widget(value, area);
}
}
#[derive(Default)]
struct U3(u8);
impl U3 {
pub fn increment(&mut self) {
if self.0 == 5 {
self.0 = 0;
} else {
self.0 += 1;
}
}
pub fn value(&self) -> u8 {
self.0
}
}
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