3 files changed, 92 insertions, 0 deletions
diff --git a/include/cru/platform/native/basic_types.hpp b/include/cru/platform/native/basic_types.hpp
new file mode 100644
index 00000000..573a9e76
--- /dev/null
+++ b/include/cru/platform/native/basic_types.hpp
@@ -0,0 +1,11 @@
+#pragma once
+#include "cru/common/pre_config.hpp"
+
+namespace cru::platform::native {
+struct Dpi {
+  float x;
+  float y;
+};
+
+enum class MouseButton { Left, Right, Middle };
+}  // namespace cru::platform
diff --git a/include/cru/platform/native/native_window.hpp b/include/cru/platform/native/native_window.hpp
new file mode 100644
index 00000000..a82e7a23
--- /dev/null
+++ b/include/cru/platform/native/native_window.hpp
@@ -0,0 +1,50 @@
+#pragma once
+#include "cru/common/base.hpp"
+
+#include "basic_types.hpp"
+#include "cru/common/event.hpp"
+#include "cru/common/ui_base.hpp"
+
+namespace cru::platform::graph {
+struct Painter;
+}
+
+namespace cru::platform::native {
+struct NativeWindow : public virtual Interface {
+  // Return if the window is still valid, that is, hasn't been closed or
+  // destroyed.
+  virtual bool IsValid() = 0;
+  virtual void SetDeleteThisOnDestroy(bool value) = 0;
+
+  virtual void Close() = 0;
+
+  virtual NativeWindow* GetParent() = 0;
+
+  virtual bool IsVisible() = 0;
+  virtual void SetVisible(bool is_visible) = 0;
+
+  virtual ui::Size GetClientSize() = 0;
+  virtual void SetClientSize(const ui::Size& size) = 0;
+
+  // Get the rect of the window containing frame.
+  // The lefttop of the rect is relative to screen lefttop.
+  virtual ui::Rect GetWindowRect() = 0;
+
+  // Set the rect of the window containing frame.
+  // The lefttop of the rect is relative to screen lefttop.
+  virtual void SetWindowRect(const ui::Rect& rect) = 0;
+
+  virtual graph::Painter* BeginPaint() = 0;
+
+  virtual Event<>* DestroyEvent() = 0;
+  virtual Event<const ui::Size&>* ResizeEvent() = 0;
+  virtual Event<>* PaintEvent() = 0;
+  virtual Event<bool>* FocusEvent() = 0;
+  virtual Event<bool>* MouseEnterLeaveEvent() = 0;
+  virtual Event<const ui::Point&>* MouseMoveEvent() = 0;
+  virtual Event<MouseButton, const ui::Point&>* MouseDownEvent() = 0;
+  virtual Event<MouseButton, const ui::Point&>* MouseUpEvent() = 0;
+  virtual Event<int>* KeyDownEvent() = 0;
+  virtual Event<int>* KeyUpEvent() = 0;
+};
+}  // namespace cru::platform::ui
diff --git a/include/cru/platform/native/ui_applicaition.hpp b/include/cru/platform/native/ui_applicaition.hpp
new file mode 100644
index 00000000..8d42d813
--- /dev/null
+++ b/include/cru/platform/native/ui_applicaition.hpp
@@ -0,0 +1,31 @@
+#pragma once
+#include "cru/common/base.hpp"
+
+#include <chrono>
+#include <functional>
+#include <vector>
+
+namespace cru::platform::graph {
+struct GraphFactory;
+}
+
+namespace cru::platform::native {
+struct NativeWindow;
+
+struct UiApplication : public virtual Interface {
+  static UiApplication* GetInstance();
+
+  virtual int Run() = 0;
+  virtual void Quit(int quite_code) = 0;
+
+  virtual void InvokeLater(const std::function<void()>& action) = 0;
+  virtual unsigned long SetTimeout(std::chrono::milliseconds milliseconds,
+                                   const std::function<void()>& action) = 0;
+  virtual unsigned long SetInterval(std::chrono::milliseconds milliseconds,
+                                    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;
+};
+}  // namespace cru::platform::ui