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+#include "win32_window.h"
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+
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+#include <flutter_windows.h>
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+
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+#include "resource.h"
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+
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+namespace {
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+
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+constexpr const wchar_t kWindowClassName[] = L"FLUTTER_RUNNER_WIN32_WINDOW";
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+
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+// The number of Win32Window objects that currently exist.
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+static int g_active_window_count = 0;
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+
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+using EnableNonClientDpiScaling = BOOL __stdcall(HWND hwnd);
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+
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+// Scale helper to convert logical scaler values to physical using passed in
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+// scale factor
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+int Scale(int source, double scale_factor) {
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+ return static_cast<int>(source * scale_factor);
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+}
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+
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+// Dynamically loads the |EnableNonClientDpiScaling| from the User32 module.
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+// This API is only needed for PerMonitor V1 awareness mode.
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+void EnableFullDpiSupportIfAvailable(HWND hwnd) {
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+ HMODULE user32_module = LoadLibraryA("User32.dll");
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+ if (!user32_module) {
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+ return;
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+ }
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+ auto enable_non_client_dpi_scaling =
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+ reinterpret_cast<EnableNonClientDpiScaling*>(
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+ GetProcAddress(user32_module, "EnableNonClientDpiScaling"));
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+ if (enable_non_client_dpi_scaling != nullptr) {
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+ enable_non_client_dpi_scaling(hwnd);
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+ FreeLibrary(user32_module);
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+ }
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+}
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+
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+} // namespace
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+
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+// Manages the Win32Window's window class registration.
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+class WindowClassRegistrar {
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+ public:
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+ ~WindowClassRegistrar() = default;
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+
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+ // Returns the singleton registar instance.
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+ static WindowClassRegistrar* GetInstance() {
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+ if (!instance_) {
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+ instance_ = new WindowClassRegistrar();
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+ }
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+ return instance_;
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+ }
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+
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+ // Returns the name of the window class, registering the class if it hasn't
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+ // previously been registered.
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+ const wchar_t* GetWindowClass();
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+
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+ // Unregisters the window class. Should only be called if there are no
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+ // instances of the window.
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+ void UnregisterWindowClass();
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+
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+ private:
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+ WindowClassRegistrar() = default;
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+
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+ static WindowClassRegistrar* instance_;
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+
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+ bool class_registered_ = false;
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+};
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+
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+WindowClassRegistrar* WindowClassRegistrar::instance_ = nullptr;
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+
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+const wchar_t* WindowClassRegistrar::GetWindowClass() {
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+ if (!class_registered_) {
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+ WNDCLASS window_class{};
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+ window_class.hCursor = LoadCursor(nullptr, IDC_ARROW);
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+ window_class.lpszClassName = kWindowClassName;
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+ window_class.style = CS_HREDRAW | CS_VREDRAW;
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+ window_class.cbClsExtra = 0;
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+ window_class.cbWndExtra = 0;
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+ window_class.hInstance = GetModuleHandle(nullptr);
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+ window_class.hIcon =
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+ LoadIcon(window_class.hInstance, MAKEINTRESOURCE(IDI_APP_ICON));
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+ window_class.hbrBackground = 0;
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+ window_class.lpszMenuName = nullptr;
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+ window_class.lpfnWndProc = Win32Window::WndProc;
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+ RegisterClass(&window_class);
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+ class_registered_ = true;
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+ }
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+ return kWindowClassName;
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+}
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+
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+void WindowClassRegistrar::UnregisterWindowClass() {
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+ UnregisterClass(kWindowClassName, nullptr);
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+ class_registered_ = false;
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+}
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+
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+Win32Window::Win32Window() {
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+ ++g_active_window_count;
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+}
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+
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+Win32Window::~Win32Window() {
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+ --g_active_window_count;
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+ Destroy();
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+}
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+
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+bool Win32Window::CreateAndShow(const std::wstring& title,
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+ const Point& origin,
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+ const Size& size) {
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+ Destroy();
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+
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+ const wchar_t* window_class =
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+ WindowClassRegistrar::GetInstance()->GetWindowClass();
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+
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+ const POINT target_point = {static_cast<LONG>(origin.x),
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+ static_cast<LONG>(origin.y)};
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+ HMONITOR monitor = MonitorFromPoint(target_point, MONITOR_DEFAULTTONEAREST);
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+ UINT dpi = FlutterDesktopGetDpiForMonitor(monitor);
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+ double scale_factor = dpi / 96.0;
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+
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+ HWND window = CreateWindow(
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+ window_class, title.c_str(), WS_OVERLAPPEDWINDOW | WS_VISIBLE,
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+ Scale(origin.x, scale_factor), Scale(origin.y, scale_factor),
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+ Scale(size.width, scale_factor), Scale(size.height, scale_factor),
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+ nullptr, nullptr, GetModuleHandle(nullptr), this);
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+
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+ if (!window) {
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+ return false;
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+ }
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+
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+ return OnCreate();
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+}
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+
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+// static
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+LRESULT CALLBACK Win32Window::WndProc(HWND const window,
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+ UINT const message,
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+ WPARAM const wparam,
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+ LPARAM const lparam) noexcept {
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+ if (message == WM_NCCREATE) {
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+ auto window_struct = reinterpret_cast<CREATESTRUCT*>(lparam);
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+ SetWindowLongPtr(window, GWLP_USERDATA,
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+ reinterpret_cast<LONG_PTR>(window_struct->lpCreateParams));
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+
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+ auto that = static_cast<Win32Window*>(window_struct->lpCreateParams);
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+ EnableFullDpiSupportIfAvailable(window);
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+ that->window_handle_ = window;
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+ } else if (Win32Window* that = GetThisFromHandle(window)) {
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+ return that->MessageHandler(window, message, wparam, lparam);
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+ }
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+
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+ return DefWindowProc(window, message, wparam, lparam);
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+}
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+
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+LRESULT
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+Win32Window::MessageHandler(HWND hwnd,
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+ UINT const message,
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+ WPARAM const wparam,
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+ LPARAM const lparam) noexcept {
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+ switch (message) {
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+ case WM_DESTROY:
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+ window_handle_ = nullptr;
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+ Destroy();
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+ if (quit_on_close_) {
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+ PostQuitMessage(0);
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+ }
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+ return 0;
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+
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+ case WM_DPICHANGED: {
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+ auto newRectSize = reinterpret_cast<RECT*>(lparam);
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+ LONG newWidth = newRectSize->right - newRectSize->left;
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+ LONG newHeight = newRectSize->bottom - newRectSize->top;
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+
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+ SetWindowPos(hwnd, nullptr, newRectSize->left, newRectSize->top, newWidth,
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+ newHeight, SWP_NOZORDER | SWP_NOACTIVATE);
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+
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+ return 0;
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+ }
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+ case WM_SIZE: {
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+ RECT rect = GetClientArea();
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+ if (child_content_ != nullptr) {
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+ // Size and position the child window.
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+ MoveWindow(child_content_, rect.left, rect.top, rect.right - rect.left,
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+ rect.bottom - rect.top, TRUE);
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+ }
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+ return 0;
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+ }
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+
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+ case WM_ACTIVATE:
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+ if (child_content_ != nullptr) {
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+ SetFocus(child_content_);
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+ }
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+ return 0;
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+ }
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+
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+ return DefWindowProc(window_handle_, message, wparam, lparam);
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+}
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+
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+void Win32Window::Destroy() {
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+ OnDestroy();
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+
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+ if (window_handle_) {
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+ DestroyWindow(window_handle_);
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+ window_handle_ = nullptr;
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+ }
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+ if (g_active_window_count == 0) {
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+ WindowClassRegistrar::GetInstance()->UnregisterWindowClass();
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+ }
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+}
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+
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+Win32Window* Win32Window::GetThisFromHandle(HWND const window) noexcept {
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+ return reinterpret_cast<Win32Window*>(
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+ GetWindowLongPtr(window, GWLP_USERDATA));
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+}
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+
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+void Win32Window::SetChildContent(HWND content) {
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+ child_content_ = content;
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+ SetParent(content, window_handle_);
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+ RECT frame = GetClientArea();
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+
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+ MoveWindow(content, frame.left, frame.top, frame.right - frame.left,
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+ frame.bottom - frame.top, true);
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+
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+ SetFocus(child_content_);
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+}
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+
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+RECT Win32Window::GetClientArea() {
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+ RECT frame;
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+ GetClientRect(window_handle_, &frame);
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+ return frame;
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+}
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+
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+HWND Win32Window::GetHandle() {
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+ return window_handle_;
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+}
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+
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+void Win32Window::SetQuitOnClose(bool quit_on_close) {
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+ quit_on_close_ = quit_on_close;
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+}
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+
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+bool Win32Window::OnCreate() {
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+ // No-op; provided for subclasses.
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+ return true;
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+}
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+
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+void Win32Window::OnDestroy() {
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+ // No-op; provided for subclasses.
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+}
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