add badge

crates/core/src/badge.rs

@@ -0,0 +1,107 @@
+use gpui::{
+    App, Hsla, IntoElement, ParentElement as _, Refineable as _, RenderOnce, SharedString,
+    StyleRefinement, Styled as _, Window,
+};
+use gpui_native_theme::{ActiveTheme as _, Size, Theme};
+
+use crate::common::{Sizable, h_flex};
+
+/// How loud a badge is.
+#[derive(Clone, Copy, Debug, Default, PartialEq, Eq)]
+pub enum BadgeVariant {
+    /// The default; quiet muted fill for counts.
+    #[default]
+    Neutral,
+    /// The accent ramp; something active or newly added.
+    Accent,
+    /// The success ramp.
+    Success,
+    /// The warning ramp.
+    Warning,
+    /// The destructive ramp.
+    Danger,
+}
+
+impl BadgeVariant {
+    fn tokens(self, theme: &Theme) -> (Hsla, Hsla) {
+        match self {
+            Self::Neutral => (theme.colors.muted, theme.colors.muted_foreground),
+            Self::Accent => (theme.ramps.primary.base, theme.colors.primary_foreground),
+            Self::Success => (theme.ramps.success.base, theme.colors.success_foreground),
+            Self::Warning => (theme.ramps.warning.base, theme.colors.warning_foreground),
+            Self::Danger => (
+                theme.ramps.destructive.base,
+                theme.colors.destructive_foreground,
+            ),
+        }
+    }
+}
+
+/// A small pill for a count or a state.
+#[derive(IntoElement)]
+pub struct Badge {
+    label: SharedString,
+    variant: BadgeVariant,
+    size: Size,
+    style: StyleRefinement,
+}
+
+impl Badge {
+    /// Creates a badge showing `label` — a count or state word the caller formats.
+    pub fn new<L>(label: L) -> Self
+    where
+        L: Into<SharedString>,
+    {
+        Self {
+            label: label.into(),
+            variant: BadgeVariant::default(),
+            size: Size::default(),
+            style: StyleRefinement::default(),
+        }
+    }
+
+    /// Sets how loud the badge is.
+    pub fn variant(mut self, variant: BadgeVariant) -> Self {
+        self.variant = variant;
+        self
+    }
+}
+
+impl Sizable for Badge {
+    fn apply_size(&mut self, size: Size) {
+        self.size = size;
+    }
+}
+
+impl gpui::Styled for Badge {
+    fn style(&mut self) -> &mut gpui::StyleRefinement {
+        &mut self.style
+    }
+}
+
+impl RenderOnce for Badge {
+    fn render(self, _window: &mut Window, cx: &mut App) -> impl IntoElement {
+        let theme = cx.theme();
+        let metrics = theme.sizes.resolve(self.size);
+        let (background, foreground) = self.variant.tokens(theme);
+
+        // Counts read smaller than control labels, like every native badge.
+        let label_size = metrics.text_size * 0.8;
+
+        let mut pill = h_flex()
+            .flex_none()
+            .justify_center()
+            .rounded(theme.radius.full)
+            .bg(background)
+            .text_color(foreground)
+            .text_size(label_size)
+            .line_height(label_size * 1.25)
+            .px(metrics.padding_x * 0.5)
+            .py_0p5()
+            .child(self.label);
+
+        pill.style().refine(&self.style);
+
+        pill
+    }
+}

crates/core/src/lib.rs

@@ -33,6 +33,9 @@ pub mod progress;
 #[cfg(feature = "avatar")]
 pub mod avatar;
 
+#[cfg(feature = "badge")]
+pub mod badge;
+
 #[cfg(feature = "input")]
 pub mod input;