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Handle errors in download_progress example

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This commit is contained in:
Héctor Ramón Jiménez 2020-03-23 20:43:55 +01:00
parent b92e1f9574
commit 0d719bbdf3
2 changed files with 43 additions and 11 deletions
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38
examples/download_progress/src/download.rs
View File

@ -35,15 +35,23 @@ where
let response = reqwest::get(&url).await; let response = reqwest::get(&url).await;
match response { match response {
Ok(response) => Some(( Ok(response) => {
Progress::Started, if let Some(total) = response.content_length() {
State::Downloading { Some((
total: response.content_length().unwrap(), Progress::Started,
downloaded: 0, State::Downloading {
response, response,
}, total,
)), downloaded: 0,
Err(_) => None, },
))
} else {
Some((Progress::Errored, State::Finished))
}
}
Err(_) => {
Some((Progress::Errored, State::Finished))
}
} }
} }
State::Downloading { State::Downloading {
@ -67,9 +75,16 @@ where
)) ))
} }
Ok(None) => Some((Progress::Finished, State::Finished)), Ok(None) => Some((Progress::Finished, State::Finished)),
Err(_) => None, Err(_) => Some((Progress::Errored, State::Finished)),
}, },
State::Finished => None, State::Finished => {
// We do not let the stream die, as it would start a
// new download repeatedly if the user is not careful
// in case of errors.
let _: () = iced::futures::future::pending().await;
None
}
} }
}, },
)) ))
@ -81,6 +96,7 @@ pub enum Progress {
Started, Started,
Advanced(f32), Advanced(f32),
Finished, Finished,
Errored,
} }
pub enum State { pub enum State {

16
examples/download_progress/src/main.rs
View File

@ -14,6 +14,7 @@ enum Example {
Idle { button: button::State }, Idle { button: button::State },
Downloading { progress: f32 }, Downloading { progress: f32 },
Finished { button: button::State }, Finished { button: button::State },
Errored { button: button::State },
} }
#[derive(Debug, Clone)] #[derive(Debug, Clone)]
@ -60,6 +61,11 @@ impl Application for Example {
button: button::State::new(), button: button::State::new(),
} }
} }
download::Progress::Errored => {
*self = Example::Errored {
button: button::State::new(),
};
}
}, },
_ => {} _ => {}
}, },
@ -83,6 +89,7 @@ impl Application for Example {
Example::Idle { .. } => 0.0, Example::Idle { .. } => 0.0,
Example::Downloading { progress } => *progress, Example::Downloading { progress } => *progress,
Example::Finished { .. } => 100.0, Example::Finished { .. } => 100.0,
Example::Errored { .. } => 0.0,
}; };
let progress_bar = ProgressBar::new(0.0..=100.0, current_progress); let progress_bar = ProgressBar::new(0.0..=100.0, current_progress);
@ -106,6 +113,15 @@ impl Application for Example {
Text::new(format!("Downloading... {:.2}%", current_progress)) Text::new(format!("Downloading... {:.2}%", current_progress))
.into() .into()
} }
Example::Errored { button } => Column::new()
.spacing(10)
.align_items(Align::Center)
.push(Text::new("Something went wrong :("))
.push(
Button::new(button, Text::new("Try again"))
.on_press(Message::Download),
)
.into(),
}; };
let content = Column::new() let content = Column::new()