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1 files changed, 51 insertions, 0 deletions

diff --git a/src/win/gui/WindowManager.h b/src/win/gui/WindowManager.h
new file mode 100644
index 00000000..dba3f0a6
--- /dev/null
+++ b/src/win/gui/WindowManager.h
@@ -0,0 +1,51 @@
+#pragma once
+#include "cru/win/WinPreConfig.h"
+
+#include "cru/common/Base.h"
+
+#include <map>
+#include <memory>
+#include <vector>
+
+namespace cru::platform::gui::win {
+class WinUiApplication;
+class WinNativeWindow;
+class WindowClass;
+
+class WindowManager : public Object {
+ public:
+  WindowManager(WinUiApplication* application);
+
+  CRU_DELETE_COPY(WindowManager)
+  CRU_DELETE_MOVE(WindowManager)
+
+  ~WindowManager() override;
+
+  // Get the general window class for creating ordinary window.
+  WindowClass* GetGeneralWindowClass() const {
+    return general_window_class_.get();
+  }
+
+  // Register a window newly created.
+  // This function adds the hwnd to hwnd-window map.
+  // It should be called immediately after a window was created.
+  void RegisterWindow(HWND hwnd, WinNativeWindow* window);
+
+  // Unregister a window that is going to be destroyed.
+  // This function removes the hwnd from the hwnd-window map.
+  // It should be called immediately before a window is going to be destroyed,
+  void UnregisterWindow(HWND hwnd);
+
+  // Return a pointer to the Window object related to the HWND or nullptr if the
+  // hwnd is not in the map.
+  WinNativeWindow* FromHandle(HWND hwnd);
+
+  std::vector<WinNativeWindow*> GetAllWindows() const;
+
+ private:
+  WinUiApplication* application_;
+
+  std::unique_ptr<WindowClass> general_window_class_;
+  std::map<HWND, WinNativeWindow*> window_map_;
+};
+}  // namespace cru::platform::gui::win