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|
mod download;
use iced::widget::{button, center, column, progress_bar, text, Column};
use iced::{Alignment, Element, Subscription};
pub fn main() -> iced::Result {
iced::program("Download Progress - Iced", Example::update, Example::view)
.subscription(Example::subscription)
.run()
}
#[derive(Debug)]
struct Example {
downloads: Vec<Download>,
last_id: usize,
}
#[derive(Debug, Clone)]
pub enum Message {
Add,
Download(usize),
DownloadProgressed((usize, download::Progress)),
}
impl Example {
fn new() -> Self {
Self {
downloads: vec![Download::new(0)],
last_id: 0,
}
}
fn update(&mut self, message: Message) {
match message {
Message::Add => {
self.last_id += 1;
self.downloads.push(Download::new(self.last_id));
}
Message::Download(index) => {
if let Some(download) = self.downloads.get_mut(index) {
download.start();
}
}
Message::DownloadProgressed((id, progress)) => {
if let Some(download) =
self.downloads.iter_mut().find(|download| download.id == id)
{
download.progress(progress);
}
}
}
}
fn subscription(&self) -> Subscription<Message> {
Subscription::batch(self.downloads.iter().map(Download::subscription))
}
fn view(&self) -> Element<Message> {
let downloads =
Column::with_children(self.downloads.iter().map(Download::view))
.push(
button("Add another download")
.on_press(Message::Add)
.padding(10),
)
.spacing(20)
.align_items(Alignment::End);
center(downloads).padding(20).into()
}
}
impl Default for Example {
fn default() -> Self {
Self::new()
}
}
#[derive(Debug)]
struct Download {
id: usize,
state: State,
}
#[derive(Debug)]
enum State {
Idle,
Downloading { progress: f32 },
Finished,
Errored,
}
impl Download {
pub fn new(id: usize) -> Self {
Download {
id,
state: State::Idle,
}
}
pub fn start(&mut self) {
match self.state {
State::Idle { .. }
| State::Finished { .. }
| State::Errored { .. } => {
self.state = State::Downloading { progress: 0.0 };
}
State::Downloading { .. } => {}
}
}
pub fn progress(&mut self, new_progress: download::Progress) {
if let State::Downloading { progress } = &mut self.state {
match new_progress {
download::Progress::Started => {
*progress = 0.0;
}
download::Progress::Advanced(percentage) => {
*progress = percentage;
}
download::Progress::Finished => {
self.state = State::Finished;
}
download::Progress::Errored => {
self.state = State::Errored;
}
}
}
}
pub fn subscription(&self) -> Subscription<Message> {
match self.state {
State::Downloading { .. } => {
download::file(self.id, "https://speed.hetzner.de/100MB.bin?")
.map(Message::DownloadProgressed)
}
_ => Subscription::none(),
}
}
pub fn view(&self) -> Element<Message> {
let current_progress = match &self.state {
State::Idle { .. } => 0.0,
State::Downloading { progress } => *progress,
State::Finished { .. } => 100.0,
State::Errored { .. } => 0.0,
};
let progress_bar = progress_bar(0.0..=100.0, current_progress);
let control: Element<_> = match &self.state {
State::Idle => button("Start the download!")
.on_press(Message::Download(self.id))
.into(),
State::Finished => {
column!["Download finished!", button("Start again")]
.spacing(10)
.align_items(Alignment::Center)
.into()
}
State::Downloading { .. } => {
text!("Downloading... {current_progress:.2}%").into()
}
State::Errored => column![
"Something went wrong :(",
button("Try again").on_press(Message::Download(self.id)),
]
.spacing(10)
.align_items(Alignment::Center)
.into(),
};
Column::new()
.spacing(10)
.padding(10)
.align_items(Alignment::Center)
.push(progress_bar)
.push(control)
.into()
}
}
|
