badge: Add Badge. (#462)

<img width="824" alt="image"
src="https://github.com/user-attachments/assets/1aacdb99-a890-46fb-a0db-a94eb125598b">

<img width="824" alt="image"
src="https://github.com/user-attachments/assets/b9af9807-4994-4050-84d9-cf5d4d8d172a">

README.md

@@ -66,6 +66,7 @@ A UI components for building desktop application by using [GPUI](https://gpui.rs
 - [x] Accordion
 - [x] Sidebar
 - [x] Breadcrumb
+- [x] Badge
 
 ## Showcase
 

crates/story/src/lib.rs

@@ -41,8 +41,8 @@ pub use webview_story::WebViewStory;
 
 use gpui::{
     actions, div, prelude::FluentBuilder as _, px, AnyElement, AnyView, AppContext, Div,
-    EventEmitter, FocusableView, Hsla, InteractiveElement, IntoElement, ParentElement, Render,
-    SharedString, Styled as _, View, ViewContext, VisualContext, WindowContext,
+    Entity as _, EventEmitter, FocusableView, Hsla, InteractiveElement, IntoElement, ParentElement,
+    Render, SharedString, Styled as _, View, ViewContext, VisualContext, WindowContext,
 };
 
 use ui::{
@@ -53,8 +53,9 @@ use ui::{
     label::Label,
     notification::Notification,
     popup_menu::PopupMenu,
+    scroll::ScrollbarAxis,
     theme::ActiveTheme,
-    v_flex, ContextModal, IconName,
+    v_flex, ContextModal, IconName, StyledExt as _,
 };
 
 const PANEL_NAME: &str = "StoryContainer";
@@ -334,6 +335,7 @@ impl Render for StoryContainer {
         v_flex()
             .id("story-container")
             .size_full()
+            .scrollable(cx.view().entity_id(), ScrollbarAxis::Both)
             .track_focus(&self.focus_handle)
             .on_action(cx.listener(Self::on_action_panel_info))
             .when(self.description.len() > 0, |this| {

crates/story/src/text_story.rs

@@ -4,6 +4,7 @@ use gpui::{
 };
 
 use ui::{
+    badge::Badge,
     button::{Button, ButtonVariant, ButtonVariants as _},
     checkbox::Checkbox,
     clipboard::Clipboard,
@@ -11,7 +12,7 @@ use ui::{
     label::Label,
     link::Link,
     radio::Radio,
-    v_flex, Disableable as _, IconName, StyledExt,
+    v_flex, Disableable as _, IconName, Sizable, StyledExt,
 };
 
 use crate::section;
@@ -245,5 +246,24 @@ impl Render for TextStory {
                         )
                 ),
             )
+            .child(
+                section("Badge", cx)
+                    .child(
+                        h_flex().gap_2()
+                            .child(Badge::primary().small().child("Badge"))
+                            .child(Badge::secondary().small().child("Secondary"))
+                            .child(Badge::outline().small().child("Outline"))
+                            .child(Badge::destructive().small().child("Destructive"))
+                            .child(Badge::custom(ui::yellow_500(), ui::yellow_800(), ui::yellow_500()).small().child("Custom"))
+                    )
+                    .child(
+                        h_flex().gap_2()
+                            .child(Badge::primary().child("Badge"))
+                            .child(Badge::secondary().child("Secondary"))
+                            .child(Badge::outline().child("Outline"))
+                            .child(Badge::destructive().child("Destructive"))
+                            .child(Badge::custom(ui::yellow_500(), ui::yellow_800(), ui::yellow_500()).child("Custom"))
+                    )
+            )
     }
 }

crates/ui/src/badge.rs

@@ -0,0 +1,123 @@
+use crate::{theme::ActiveTheme as _, Sizable, Size};
+use gpui::{
+    div, prelude::FluentBuilder as _, relative, Div, Hsla, InteractiveElement as _, IntoElement,
+    ParentElement, RenderOnce, Styled,
+};
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Default)]
+pub enum BadgeVariant {
+    #[default]
+    Primary,
+    Secondary,
+    Outline,
+    Destructive,
+    Custom {
+        color: Hsla,
+        foreground: Hsla,
+        border: Hsla,
+    },
+}
+impl BadgeVariant {
+    fn bg(&self, cx: &gpui::WindowContext) -> Hsla {
+        match self {
+            Self::Primary => cx.theme().primary,
+            Self::Secondary => cx.theme().secondary,
+            Self::Outline => gpui::transparent_black(),
+            Self::Destructive => cx.theme().destructive,
+            Self::Custom { color, .. } => *color,
+        }
+    }
+
+    fn border(&self, cx: &gpui::WindowContext) -> Hsla {
+        match self {
+            Self::Primary => cx.theme().primary,
+            Self::Secondary => cx.theme().secondary,
+            Self::Outline => cx.theme().border,
+            Self::Destructive => cx.theme().destructive,
+            Self::Custom { border, .. } => *border,
+        }
+    }
+
+    fn fg(&self, cx: &gpui::WindowContext) -> Hsla {
+        match self {
+            Self::Primary => cx.theme().primary_foreground,
+            Self::Secondary => cx.theme().secondary_foreground,
+            Self::Outline => cx.theme().foreground,
+            Self::Destructive => cx.theme().destructive_foreground,
+            Self::Custom { foreground, .. } => *foreground,
+        }
+    }
+}
+
+/// Badge is a small status indicator for UI elements.
+///
+/// Only support: Medium, Small
+#[derive(IntoElement)]
+pub struct Badge {
+    base: Div,
+    veriant: BadgeVariant,
+    size: Size,
+}
+impl Badge {
+    fn new() -> Self {
+        Self {
+            base: div().flex().items_center().rounded_md().border_1(),
+            veriant: BadgeVariant::default(),
+            size: Size::Medium,
+        }
+    }
+
+    pub fn with_variant(mut self, variant: BadgeVariant) -> Self {
+        self.veriant = variant;
+        self
+    }
+
+    pub fn primary() -> Self {
+        Self::new().with_variant(BadgeVariant::Primary)
+    }
+
+    pub fn secondary() -> Self {
+        Self::new().with_variant(BadgeVariant::Secondary)
+    }
+
+    pub fn outline() -> Self {
+        Self::new().with_variant(BadgeVariant::Outline)
+    }
+
+    pub fn destructive() -> Self {
+        Self::new().with_variant(BadgeVariant::Destructive)
+    }
+
+    pub fn custom(color: Hsla, foreground: Hsla, border: Hsla) -> Self {
+        Self::new().with_variant(BadgeVariant::Custom {
+            color,
+            foreground,
+            border,
+        })
+    }
+}
+impl Sizable for Badge {
+    fn with_size(mut self, size: impl Into<Size>) -> Self {
+        self.size = size.into();
+        self
+    }
+}
+impl ParentElement for Badge {
+    fn extend(&mut self, elements: impl IntoIterator<Item = gpui::AnyElement>) {
+        self.base.extend(elements);
+    }
+}
+impl RenderOnce for Badge {
+    fn render(self, cx: &mut gpui::WindowContext) -> impl IntoElement {
+        self.base
+            .line_height(relative(1.3))
+            .map(|this| match self.size {
+                Size::XSmall | Size::Small => this.text_xs().px_1p5().py_0(),
+                _ => this.text_xs().px_2p5().py_0p5(),
+            })
+            .bg(self.veriant.bg(cx))
+            .text_color(self.veriant.fg(cx))
+            .border_color(self.veriant.border(cx))
+            .hover(|this| this.opacity(0.9))
+    }
+}

crates/ui/src/lib.rs

@@ -10,6 +10,7 @@ mod title_bar;
 
 pub mod accordion;
 pub mod animation;
+pub mod badge;
 pub mod breadcrumb;
 pub mod button;
 pub mod button_group;