add scrollarea

crates/theme/src/resolve.rs

@@ -1,7 +1,7 @@
 use crate::definition::ThemeDefinition;
 use crate::ramps::{AccentShades, Oklch, contrast_foreground, derive_shades, mix};
 use crate::system::SystemTheme;
-use crate::{ColorTokens, Elevations, Motion, Radius, SizeTable, ThemeVariant};
+use crate::{ColorTokens, Elevations, Motion, Radius, Scrollbar, SizeTable, ThemeVariant};
 use gpui::px;
 
 /// Derived state shades for the colors that get pressed and hovered.
@@ -21,6 +21,7 @@ pub struct ResolvedTheme {
     pub radius: Radius,
     pub elevations: Elevations,
     pub motion: Motion,
+    pub scrollbar: Scrollbar,
     /// The platform's native root font size; the fallback theme uses 16.
     pub root_font_size: gpui::Pixels,
     pub sizes: SizeTable,
@@ -130,6 +131,11 @@ pub(crate) fn resolve(
             system_palette.overlay,
             base.overlay,
         ),
+        scrollbar_thumb: pick(
+            def_color(|d| d.scrollbar_thumb()),
+            system_palette.scrollbar_thumb,
+            base.scrollbar_thumb,
+        ),
     };
 
     let accessibility = system.accessibility;
@@ -181,6 +187,7 @@ pub(crate) fn resolve(
         radius,
         elevations: Elevations::default(),
         motion: Motion::default(),
+        scrollbar: Scrollbar::default(),
         root_font_size,
         sizes,
         accessibility,