1 files changed, 70 insertions, 0 deletions
diff --git a/src/platform_win/god_window.cpp b/src/platform_win/god_window.cpp
new file mode 100644
index 00000000..2b4fbe48
--- /dev/null
+++ b/src/platform_win/god_window.cpp
@@ -0,0 +1,70 @@
+#include "cru/platform/win/god_window.hpp"
+
+#include "cru/platform/win/exception.hpp"
+#include "cru/platform/win/win_application.hpp"
+#include "cru/platform/win/window_class.hpp"
+#include "god_window_message.hpp"
+#include "timer.hpp"
+
+namespace cru::platform::win {
+constexpr auto god_window_class_name = L"GodWindowClass";
+
+LRESULT CALLBACK GodWndProc(HWND hWnd, UINT uMsg, WPARAM wParam,
+                            LPARAM lParam) {
+  const auto app = WinApplication::GetInstance();
+
+  if (app) {
+    const auto result =
+        app->GetGodWindow()->HandleGodWindowMessage(hWnd, uMsg, wParam, lParam);
+    if (result.has_value())
+      return result.value();
+    else
+      return DefWindowProcW(hWnd, uMsg, wParam, lParam);
+  } else
+    return DefWindowProcW(hWnd, uMsg, wParam, lParam);
+}
+
+GodWindow::GodWindow(WinApplication* application) {
+  application_ = application;
+
+  const auto h_instance = application->GetInstanceHandle();
+
+  god_window_class_ = std::make_shared<WindowClass>(god_window_class_name,
+                                                    GodWndProc, h_instance);
+
+  hwnd_ = CreateWindowEx(0, god_window_class_name, L"", 0, CW_USEDEFAULT,
+                         CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT,
+                         HWND_MESSAGE, nullptr, h_instance, nullptr);
+
+  if (hwnd_ == nullptr) throw Win32Error(::GetLastError(), "Failed to create god window.");
+}
+
+GodWindow::~GodWindow() { ::DestroyWindow(hwnd_); }
+
+std::optional<LRESULT> GodWindow::HandleGodWindowMessage(HWND hwnd, int msg,
+                                                         WPARAM w_param,
+                                                         LPARAM l_param) {
+  switch (msg) {
+    case invoke_later_message_id: {
+      const auto p_action = reinterpret_cast<std::function<void()>*>(w_param);
+      (*p_action)();
+      delete p_action;
+      return 0;
+    }
+    case WM_TIMER: {
+      const auto id = static_cast<UINT_PTR>(w_param);
+      const auto action = application_->GetTimerManager()->GetAction(id);
+      if (action.has_value()) {
+        (action.value().second)();
+        if (!action.value().first)
+          application_->GetTimerManager()->KillTimer(id);
+        return 0;
+      }
+      break;
+    }
+    default:
+      return std::nullopt;
+  }
+  return std::nullopt;
+}
+}  // namespace cru::platform::win
+\ No newline at end of file