Supporting setting panel layout

editor/panels/viewport_panel.hpp

@@ -0,0 +1,17 @@
+#pragma once
+
+#include <sophia/frame_info.hpp>
+#include <sophia/ui/panel.hpp>
+
+class ViewportPanel : public sophia::Panel {
+ public:
+  ViewportPanel() : Panel{{.name = "Viewport"}} {}
+
+  void onUpdate(const sophia::FrameInfo& frameInfo) override;
+
+ private:
+  enum class GizmoMode { Move, Rotate, Scale };
+
+  GizmoMode gizmoMode = GizmoMode::Move;
+  bool showGrid = true;
+};