feat: add progress indicators example

examples/progress_indicators/src/main.rs

@@ -0,0 +1,104 @@
+use iced::executor;
+use iced::widget::{column, container, row, slider, text};
+use iced::{Application, Command, Element, Length, Settings, Theme};
+
+use std::time::Duration;
+
+mod circular;
+mod easing;
+mod linear;
+
+use circular::Circular;
+use linear::Linear;
+
+pub fn main() -> iced::Result {
+    ProgressIndicators::run(Settings {
+        antialiasing: true,
+        ..Default::default()
+    })
+}
+
+struct ProgressIndicators {
+    cycle_duration: f32,
+}
+
+impl Default for ProgressIndicators {
+    fn default() -> Self {
+        Self {
+            cycle_duration: 2.0,
+        }
+    }
+}
+
+#[derive(Debug, Clone, Copy)]
+enum Message {
+    CycleDurationChanged(f32),
+}
+
+impl Application for ProgressIndicators {
+    type Message = Message;
+    type Flags = ();
+    type Executor = executor::Default;
+    type Theme = Theme;
+
+    fn new(_flags: Self::Flags) -> (Self, Command<Message>) {
+        (Self::default(), Command::none())
+    }
+
+    fn title(&self) -> String {
+        String::from("Progress Indicators - Iced")
+    }
+
+    fn update(&mut self, message: Message) -> Command<Message> {
+        match message {
+            Message::CycleDurationChanged(duration) => {
+                self.cycle_duration = duration;
+            }
+        }
+
+        Command::none()
+    }
+
+    fn view(&self) -> Element<Message> {
+        let column = easing::EXAMPLES
+            .iter()
+            .zip(["Decelerating:", "Accelerating:", "Standard:"])
+            .fold(column![], |column, (easing, label)| {
+                column.push(
+                    row![
+                        text(label).width(150),
+                        Linear::new().easing(easing).cycle_duration(
+                            Duration::from_secs_f32(self.cycle_duration)
+                        ),
+                        Circular::new().easing(easing).cycle_duration(
+                            Duration::from_secs_f32(self.cycle_duration)
+                        )
+                    ]
+                    .align_items(iced::Alignment::Center)
+                    .spacing(20.0),
+                )
+            })
+            .spacing(20);
+
+        container(
+            column.push(
+                row(vec![
+                    text("Cycle duration:").into(),
+                    slider(1.0..=1000.0, self.cycle_duration * 100.0, |x| {
+                        Message::CycleDurationChanged(x / 100.0)
+                    })
+                    .width(150.0)
+                    .into(),
+                    text(format!("{:.2}s", self.cycle_duration)).into(),
+                ])
+                .align_items(iced::Alignment::Center)
+                .spacing(20.0),
+            ),
+        )
+        .width(Length::Fill)
+        .height(Length::Fill)
+        .center_x()
+        .center_y()
+        .into()
+    }
+}