[feat]: implement ui layer arch

1 files changed, 27 insertions, 0 deletions

diff --git a/src/ui/ui_layer.h b/src/ui/ui_layer.h
new file mode 100644
index 0000000..67c9d8f
--- /dev/null
+++ b/src/ui/ui_layer.h
@@ -0,0 +1,27 @@
+#pragma once
+
+#include "workspace.h"
+#include "rendering/view.h"
+#include "core/memory.h"
+
+#include <vector>
+
+namespace Donut
+{
+    // The Dorico-style tab strip. Owns the workspaces (Setup / Scene / Simulation
+    // / Export); each frame it draws the dock space, the shared header, the tab
+    // bar, and delegates the active tab's panels. Returns the active workspace's
+    // View so the Application knows what the RenderPath should draw.
+    class UILayer
+    {
+    public:
+        UILayer();
+        auto draw(const UIContext& ctx) -> View;
+
+    private:
+        std::vector<Scope<Workspace>> m_workspaces;
+        int  m_active  = 0;
+        int  m_landing = 0;      // tab selected on the first frame
+        bool m_landed  = false;
+    };
+}