Implement active box using new draw item on draw layers

scwx-qt/source/scwx/qt/gl/draw/draw_item.hpp

@@ -0,0 +1,39 @@
+#pragma once
+
+#include <memory>
+
+namespace scwx
+{
+namespace qt
+{
+namespace gl
+{
+namespace draw
+{
+
+class DrawItemImpl;
+
+class DrawItem
+{
+public:
+   explicit DrawItem();
+   ~DrawItem();
+
+   DrawItem(const DrawItem&) = delete;
+   DrawItem& operator=(const DrawItem&) = delete;
+
+   DrawItem(DrawItem&&) noexcept;
+   DrawItem& operator=(DrawItem&&) noexcept;
+
+   virtual void Initialize()   = 0;
+   virtual void Render()       = 0;
+   virtual void Deinitialize() = 0;
+
+private:
+   std::unique_ptr<DrawItemImpl> p;
+};
+
+} // namespace draw
+} // namespace gl
+} // namespace qt
+} // namespace scwx