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1 files changed, 56 insertions, 0 deletions

diff --git a/src/win/gui/WindowManager.cpp b/src/win/gui/WindowManager.cpp
new file mode 100644
index 00000000..4e84e967
--- /dev/null
+++ b/src/win/gui/WindowManager.cpp
@@ -0,0 +1,56 @@
+#include "WindowManager.hpp"
+
+#include "cru/win/gui/UiApplication.hpp"
+#include "cru/win/gui/Window.hpp"
+#include "cru/win/gui/WindowClass.hpp"
+
+namespace cru::platform::gui::win {
+LRESULT __stdcall GeneralWndProc(HWND hWnd, UINT Msg, WPARAM wParam,
+                                 LPARAM lParam) {
+  auto window =
+      WinUiApplication::GetInstance()->GetWindowManager()->FromHandle(hWnd);
+
+  LRESULT result;
+  if (window != nullptr &&
+      window->HandleNativeWindowMessage(hWnd, Msg, wParam, lParam, &result))
+    return result;
+
+  return DefWindowProc(hWnd, Msg, wParam, lParam);
+}
+
+WindowManager::WindowManager(WinUiApplication* application) {
+  application_ = application;
+  general_window_class_ = std::make_unique<WindowClass>(
+      L"CruUIWindowClass", GeneralWndProc, application->GetInstanceHandle());
+}
+
+WindowManager::~WindowManager() {
+  for (const auto& [key, window] : window_map_) delete window;
+}
+
+void WindowManager::RegisterWindow(HWND hwnd, WinNativeWindow* window) {
+  Expects(window_map_.count(hwnd) == 0);  // The hwnd is already in the map.
+  window_map_.emplace(hwnd, window);
+}
+
+void WindowManager::UnregisterWindow(HWND hwnd) {
+  const auto find_result = window_map_.find(hwnd);
+  Expects(find_result != window_map_.end());  // The hwnd is not in the map.
+  window_map_.erase(find_result);
+  if (window_map_.empty()) application_->RequestQuit(0);
+}
+
+WinNativeWindow* WindowManager::FromHandle(HWND hwnd) {
+  const auto find_result = window_map_.find(hwnd);
+  if (find_result == window_map_.end())
+    return nullptr;
+  else
+    return find_result->second;
+}
+
+std::vector<WinNativeWindow*> WindowManager::GetAllWindows() const {
+  std::vector<WinNativeWindow*> windows;
+  for (const auto& [key, value] : window_map_) windows.push_back(value);
+  return windows;
+}
+}  // namespace cru::platform::gui::win