1 files changed, 143 insertions, 0 deletions
diff --git a/examples/download_progress/src/main.rs b/examples/download_progress/src/main.rs
new file mode 100644
index 00000000..6c3094f7
--- /dev/null
+++ b/examples/download_progress/src/main.rs
@@ -0,0 +1,143 @@
+use iced::{
+    button, executor, Align, Application, Button, Column, Command, Container,
+    Element, Length, ProgressBar, Settings, Subscription, Text,
+};
+
+mod download;
+
+pub fn main() {
+    Example::run(Settings::default())
+}
+
+#[derive(Debug)]
+enum Example {
+    Idle { button: button::State },
+    Downloading { progress: f32 },
+    Finished { button: button::State },
+    Errored { button: button::State },
+}
+
+#[derive(Debug, Clone)]
+pub enum Message {
+    Download,
+    DownloadProgressed(download::Progress),
+}
+
+impl Application for Example {
+    type Executor = executor::Default;
+    type Message = Message;
+
+    fn new() -> (Example, Command<Message>) {
+        (
+            Example::Idle {
+                button: button::State::new(),
+            },
+            Command::none(),
+        )
+    }
+
+    fn title(&self) -> String {
+        String::from("Download progress - Iced")
+    }
+
+    fn update(&mut self, message: Message) -> Command<Message> {
+        match message {
+            Message::Download => match self {
+                Example::Idle { .. }
+                | Example::Finished { .. }
+                | Example::Errored { .. } => {
+                    *self = Example::Downloading { progress: 0.0 };
+                }
+                _ => {}
+            },
+            Message::DownloadProgressed(message) => match self {
+                Example::Downloading { progress } => match message {
+                    download::Progress::Started => {
+                        *progress = 0.0;
+                    }
+                    download::Progress::Advanced(percentage) => {
+                        *progress = percentage;
+                    }
+                    download::Progress::Finished => {
+                        *self = Example::Finished {
+                            button: button::State::new(),
+                        }
+                    }
+                    download::Progress::Errored => {
+                        *self = Example::Errored {
+                            button: button::State::new(),
+                        };
+                    }
+                },
+                _ => {}
+            },
+        };
+
+        Command::none()
+    }
+
+    fn subscription(&self) -> Subscription<Message> {
+        match self {
+            Example::Downloading { .. } => {
+                download::file("https://speed.hetzner.de/100MB.bin")
+                    .map(Message::DownloadProgressed)
+            }
+            _ => Subscription::none(),
+        }
+    }
+
+    fn view(&mut self) -> Element<Message> {
+        let current_progress = match self {
+            Example::Idle { .. } => 0.0,
+            Example::Downloading { progress } => *progress,
+            Example::Finished { .. } => 100.0,
+            Example::Errored { .. } => 0.0,
+        };
+
+        let progress_bar = ProgressBar::new(0.0..=100.0, current_progress);
+
+        let control: Element<_> = match self {
+            Example::Idle { button } => {
+                Button::new(button, Text::new("Start the download!"))
+                    .on_press(Message::Download)
+                    .into()
+            }
+            Example::Finished { button } => Column::new()
+                .spacing(10)
+                .align_items(Align::Center)
+                .push(Text::new("Download finished!"))
+                .push(
+                    Button::new(button, Text::new("Start again"))
+                        .on_press(Message::Download),
+                )
+                .into(),
+            Example::Downloading { .. } => {
+                Text::new(format!("Downloading... {:.2}%", current_progress))
+                    .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()
+            .spacing(10)
+            .padding(10)
+            .align_items(Align::Center)
+            .push(progress_bar)
+            .push(control);
+
+        Container::new(content)
+            .width(Length::Fill)
+            .height(Length::Fill)
+            .center_x()
+            .center_y()
+            .into()
+    }
+}