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src/dusk/ui/control_surface.cpp

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+#include "control_surface.hpp"
+
+#include <RmlUi/Core/Element.h>
+
+namespace dusk::ui {
+
+ControlSurfaceStyle control_surface_style(ControlSurfaceTone tone) {
+    switch (tone) {
+    case ControlSurfaceTone::Primary:
+        return {
+            .accent = theme::Primary,
+            .inactiveBorderOpacity = 112,
+            .inactiveBackgroundOpacity = 28,
+            .activeBorderOpacity = 255,
+            .activeBackgroundOpacity = 116,
+        };
+    case ControlSurfaceTone::Secondary:
+        return {
+            .accent = theme::Secondary,
+            .inactiveBorderOpacity = 112,
+            .inactiveBackgroundOpacity = 28,
+            .activeBorderOpacity = 255,
+            .activeBackgroundOpacity = 116,
+        };
+    case ControlSurfaceTone::Quiet:
+    default:
+        return {
+            .accent = theme::Elevated,
+            .inactiveBorderOpacity = 86,
+            .inactiveBackgroundOpacity = 0,
+            .activeBorderOpacity = 150,
+            .activeBackgroundOpacity = 68,
+        };
+    }
+}
+
+void apply_control_surface_style(Rml::Element* element, const ControlSurfaceStyle& style,
+                                 bool active) {
+    if (element == nullptr) {
+        return;
+    }
+
+    element->SetProperty("border-color",
+                         active ? theme::rgba(style.accent, style.activeBorderOpacity) :
+                                  theme::rgba(theme::ElevatedBorder,
+                                              style.inactiveBorderOpacity));
+    element->SetProperty("background-color",
+                         theme::rgba(style.accent,
+                                     active ? style.activeBackgroundOpacity :
+                                              style.inactiveBackgroundOpacity));
+}
+
+}  // namespace dusk::ui

src/dusk/ui/control_surface.hpp

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+#pragma once
+
+#include "theme.hpp"
+
+namespace Rml {
+class Element;
+}
+
+namespace dusk::ui {
+
+enum class ControlSurfaceTone {
+    Primary,
+    Secondary,
+    Quiet,
+};
+
+struct ControlSurfaceStyle {
+    theme::Color accent = theme::Primary;
+    int inactiveBorderOpacity = 86;
+    int inactiveBackgroundOpacity = 0;
+    int activeBorderOpacity = 150;
+    int activeBackgroundOpacity = 68;
+};
+
+ControlSurfaceStyle control_surface_style(ControlSurfaceTone tone);
+void apply_control_surface_style(Rml::Element* element, const ControlSurfaceStyle& style,
+                                 bool active);
+
+}  // namespace dusk::ui