3 files changed, 25 insertions, 9 deletions
diff --git a/include/cru/platform/graph/graph_factory.hpp b/include/cru/platform/graph/graph_factory.hpp
index b2619e8d..60d4ed8a 100644
--- a/include/cru/platform/graph/graph_factory.hpp
+++ b/include/cru/platform/graph/graph_factory.hpp
@@ -15,10 +15,14 @@
 
 namespace cru::platform::graph {
 // Entry point of the graph module.
+// If you create a IUiApplication instance, then you should not create
+// IGraphFactory manually. IUiApplication will call
+// IGraphFactory::CreateInstance and set auto-delete to true.
+// The manual creation method of IGraphFactory provides a you a way to use graph
+// related tools without interact with actual ui like window system.
 struct IGraphFactory : virtual Interface, virtual IAutoDelete {
   // Create a platform-specific instance and save it as the global instance.
   // Do not create the instance twice. Implements should assert for that.
-  // After the
   // After creating, get the instance by GetInstance.
   static IGraphFactory* CreateInstance();
 
diff --git a/include/cru/platform/native/native_window.hpp b/include/cru/platform/native/native_window.hpp
index 0e076348..3a0fd3e1 100644
--- a/include/cru/platform/native/native_window.hpp
+++ b/include/cru/platform/native/native_window.hpp
@@ -10,7 +10,7 @@ struct IPainter;
 }
 
 namespace cru::platform::native {
-struct NativeWindow : public virtual Interface {
+struct INativeWindow : public virtual Interface {
   // Return if the window is still valid, that is, hasn't been closed or
   // destroyed.
   virtual bool IsValid() = 0;
@@ -18,7 +18,7 @@ struct NativeWindow : public virtual Interface {
 
   virtual void Close() = 0;
 
-  virtual NativeWindow* GetParent() = 0;
+  virtual INativeWindow* GetParent() = 0;
 
   virtual bool IsVisible() = 0;
   virtual void SetVisible(bool is_visible) = 0;
diff --git a/include/cru/platform/native/ui_applicaition.hpp b/include/cru/platform/native/ui_applicaition.hpp
index 0188393e..655b8ea0 100644
--- a/include/cru/platform/native/ui_applicaition.hpp
+++ b/include/cru/platform/native/ui_applicaition.hpp
@@ -1,16 +1,28 @@
 #pragma once
 #include "cru/common/base.hpp"
 
+#include "cru/common/auto_delete.hpp"
+
 #include <chrono>
 #include <functional>
 #include <vector>
 
 namespace cru::platform::native {
-struct NativeWindow;
+struct INativeWindow;
+
+// The entry point of a ui application.
+// It will call IGraphFactory::CreateInstance during its creation
+// and set graph factory to be auto deleted. If you want to keep
+// the graph factory then you should manually set it to false after
+// creating the ui application.
+struct IUiApplication : virtual Interface, virtual IAutoDelete {
+  // Create a platform-specific instance and save it as the global instance.
+  // Do not create the instance twice. Implements should assert for that.
+  // After creating, get the instance by GetInstance.
+  static IUiApplication* CreateInstance();
 
-struct UiApplication : public virtual Interface {
-  static UiApplication* CreateInstance();
-  static UiApplication* GetInstance();
+  // Get the global instance. If it is not created, then return nullptr.
+  static IUiApplication* GetInstance();
 
   virtual int Run() = 0;
   virtual void Quit(int quite_code) = 0;
@@ -24,7 +36,7 @@ struct UiApplication : public virtual Interface {
                                     const std::function<void()>& action) = 0;
   virtual void CancelTimer(unsigned long id) = 0;
 
-  virtual std::vector<NativeWindow*> GetAllWindow() = 0;
-  virtual NativeWindow* CreateWindow(NativeWindow* parent) = 0;
+  virtual std::vector<INativeWindow*> GetAllWindow() = 0;
+  virtual INativeWindow* CreateWindow(INativeWindow* parent) = 0;
 };
 }  // namespace cru::platform::ui