add progress

crates/core/src/lib.rs

@@ -22,3 +22,6 @@ pub mod link;
 
 #[cfg(feature = "slider")]
 pub mod slider;
+
+#[cfg(feature = "progress")]
+pub mod progress;

crates/core/src/progress.rs

@@ -0,0 +1,101 @@
+//! The progress bar: determinate fill or an indeterminate sweep.
+
+use std::time::Duration;
+
+use gpui::prelude::FluentBuilder as _;
+use gpui::{
+    Animation, AnimationExt as _, App, ElementId, InteractiveElement as _, IntoElement,
+    ParentElement as _, RenderOnce, Role, SharedString, StatefulInteractiveElement as _,
+    Styled as _, Window, div, relative,
+};
+use gpui_native_theme::ActiveTheme as _;
+
+/// A progress bar. With a `value` in `0..=1` it paints a determinate fill.
+#[derive(IntoElement)]
+pub struct Progress {
+    id: ElementId,
+    value: f32,
+    indeterminate: bool,
+    a11y_label: Option<SharedString>,
+}
+
+impl Progress {
+    /// Creates a determinate progress bar at `value` (`0..=1`).
+    pub fn new<I>(id: I, value: f32) -> Self
+    where
+        I: Into<ElementId>,
+    {
+        Self {
+            id: id.into(),
+            value,
+            indeterminate: false,
+            a11y_label: None,
+        }
+    }
+
+    /// Sweeps instead of painting a fill, for work of unknown length.
+    pub fn indeterminate(mut self, indeterminate: bool) -> Self {
+        self.indeterminate = indeterminate;
+        self
+    }
+
+    /// Sets the accessibility label.
+    pub fn accessibility_label<L>(mut self, label: L) -> Self
+    where
+        L: Into<SharedString>,
+    {
+        self.a11y_label = Some(label.into());
+        self
+    }
+}
+
+impl RenderOnce for Progress {
+    fn render(self, _window: &mut Window, cx: &mut App) -> impl IntoElement {
+        let theme = cx.theme();
+        let colors = theme.colors;
+        let ramps = theme.ramps;
+        let radius = theme.radius;
+        let value = self.value.clamp(0.0, 1.0);
+
+        div()
+            .id(self.id)
+            .w_full()
+            .role(Role::ProgressIndicator)
+            .when_some(self.a11y_label, |progress, label| {
+                progress.aria_label(label)
+            })
+            .when(!self.indeterminate, |progress| {
+                progress
+                    .aria_numeric_value(f64::from(value))
+                    .aria_min_numeric_value(0.0)
+                    .aria_max_numeric_value(1.0)
+            })
+            .child(
+                div()
+                    .w_full()
+                    .h_1p5()
+                    .rounded(radius.full)
+                    .bg(colors.border)
+                    .child(if self.indeterminate {
+                        div()
+                            .h_full()
+                            .w(relative(0.3))
+                            .rounded(radius.full)
+                            .bg(ramps.primary.base)
+                            .with_animation(
+                                "indeterminate",
+                                Animation::new(Duration::from_millis(1500)).repeat(),
+                                |pill, delta| pill.ml(relative(delta * 0.7)),
+                            )
+                            .into_any_element()
+                    } else {
+                        div()
+                            .h_full()
+                            .w(relative(value))
+                            .rounded(radius.full)
+                            .bg(ramps.primary.base)
+                            .into_any_element()
+                    }),
+            )
+    }
+}