Better progress bar example

Shows multiple progress bars updated together.
This commit is contained in:
Alexandre Bury 2016-07-27 23:51:54 -07:00
parent c689a3ba7e
commit 5ce1094931
2 changed files with 107 additions and 31 deletions

View File

@ -16,5 +16,8 @@ toml = "0.1"
unicode-segmentation = "0.1.2"
unicode-width = "0.1.3"
[dev-dependencies]
rand = "0.3"
[lib]
name = "cursive"

View File

@ -1,49 +1,122 @@
extern crate cursive;
extern crate rand;
use rand::Rng;
use cursive::prelude::*;
use cursive::view::{Counter, Ticker};
use std::thread;
use std::cmp::min;
use std::time::Duration;
fn main() {
let mut siv = Cursive::new();
// We'll start slowly with a simple start button...
siv.add_layer(Dialog::empty()
.title("Progress bar example")
.padding((0, 0, 1, 1))
.content(Button::new("Start", |s| {
// Number of ticks
let n_max = 1000;
.content(Button::new("Start", phase_1)));
// This is the callback channel
let cb = s.cb_sink().clone();
// Auto-refresh is currently required for animated views
siv.set_fps(30);
s.pop_layer();
s.add_layer(Panel::new(FullView::full_width(
ProgressBar::new()
.range(0, n_max)
.with_task(move |ticker| {
// This closure will be called in a separate thread.
siv.run();
}
// Function to simulate a long process.
fn fake_load(n_max: usize, ticker: Ticker) {
for _ in 0..n_max {
thread::sleep(Duration::from_millis(5));
// The ticker method increases the progress value
ticker(1);
}
}
fn phase_1(s: &mut Cursive) {
// Phase 1 is easy: a simple pre-loading.
// Number of ticks
let n_max = 500;
// This is the callback channel
let cb = s.cb_sink().clone();
s.pop_layer();
s.add_layer(Panel::new(FullView::full_width(ProgressBar::new()
.range(0, n_max)
.with_task(move |ticker| {
// This closure will be called in a separate thread.
fake_load(n_max, ticker);
// When we're done, send a callback through the channel
cb.send(Box::new(move |s| {
cb.send(Box::new(coffee_break)).unwrap();
}))));
}
fn coffee_break(s: &mut Cursive) {
// A little break before things get serious.
s.pop_layer();
s.add_layer(Dialog::empty()
.title("Work done!")
.content(TextView::new("Phew!"))
.button("Finally!", |s| s.quit()));
}))
.unwrap();
})
)));
})));
siv.set_fps(30);
siv.run();
.title("Preparation complete")
.content(TextView::new("Now, the real deal!"))
.button("Again??", phase_2));
}
fn phase_2(s: &mut Cursive) {
// Now, we'll run N tasks
// (It could be downloading a file, extracting an archive,
// reticulating sprites, ...)
let n_bars = 10;
// Each task will have its own shiny counter
let counters: Vec<_> = (0..n_bars).map(|_| Counter::new(0)).collect();
// To make things more interesting, we'll give a random speed to each bar
let speeds: Vec<_> =
(0..n_bars).map(|_| rand::thread_rng().gen_range(50, 150)).collect();
let n_max = 100000;
let cb = s.cb_sink().clone();
// Let's prepare the progress bars...
let mut linear = LinearLayout::vertical();
for c in &counters {
linear.add_child(ProgressBar::new()
.max(n_max)
.with_value(c.clone()));
}
s.pop_layer();
s.add_layer(Dialog::new(FullView::full_width(linear))
.title("Just a moment..."));
// And we start the worker thread.
thread::spawn(move || {
loop {
thread::sleep(Duration::from_millis(5));
let mut done = true;
for (c, s) in counters.iter().zip(&speeds) {
let ticks = min(n_max - c.get(), *s);
c.tick(ticks);
if c.get() < n_max {
done = false;
}
}
if done {
break;
}
}
cb.send(Box::new(final_step)).unwrap();
});
}
fn final_step(s: &mut Cursive) {
// A little break before things get serious.
s.pop_layer();
s.add_layer(Dialog::empty()
.title("Report")
.content(TextView::new("Time travel was a success!\n\
We went forward a few seconds!!"))
.button("That's it?", |s| s.quit()));
}