v1.0.1

windows/runner/flutter_window.cpp

@@ -0,0 +1,94 @@
+#include "flutter_window.h"
+
+#include <optional>
+#include <dwmapi.h>
+#include <winreg.h>
+
+#include "flutter/generated_plugin_registrant.h"
+
+// Helper: Read AppsUseLightTheme from registry (0 = dark mode, 1 = light mode)
+static BOOL IsDarkMode() {
+  HKEY hKey;
+  DWORD value = 1;  // default: light
+  DWORD size = sizeof(value);
+  if (RegOpenKeyExW(HKEY_CURRENT_USER,
+                    L"Software\\Microsoft\\Windows\\CurrentVersion\\Themes\\Personalize",
+                    0, KEY_READ, &hKey) == ERROR_SUCCESS) {
+    RegQueryValueExW(hKey, L"AppsUseLightTheme", nullptr, nullptr,
+                     reinterpret_cast<LPBYTE>(&value), &size);
+    RegCloseKey(hKey);
+  }
+  return (value == 0) ? TRUE : FALSE;
+}
+
+// Apply dark/light title bar based on current system setting
+static void ApplyDarkTitleBar(HWND hwnd) {
+  BOOL dark = IsDarkMode();
+  DwmSetWindowAttribute(hwnd, DWMWA_USE_IMMERSIVE_DARK_MODE, &dark, sizeof(dark));
+}
+
+FlutterWindow::FlutterWindow(const flutter::DartProject& project)
+    : project_(project) {}
+
+FlutterWindow::~FlutterWindow() {}
+
+bool FlutterWindow::OnCreate() {
+  if (!Win32Window::OnCreate()) {
+    return false;
+  }
+
+  RECT frame = GetClientArea();
+
+  // The size here must match the window dimensions to avoid unnecessary surface
+  // creation / destruction in the startup path.
+  flutter_controller_ = std::make_unique<flutter::FlutterViewController>(
+      frame.right - frame.left, frame.bottom - frame.top, project_);
+  // Ensure that basic setup of the controller was successful.
+  if (!flutter_controller_->engine() || !flutter_controller_->view()) {
+    return false;
+  }
+  RegisterPlugins(flutter_controller_->engine());
+  SetChildContent(flutter_controller_->view()->GetNativeWindow());
+
+  // Apply dark/light title bar to match system theme
+  ApplyDarkTitleBar(GetHandle());
+
+  return true;
+}
+
+void FlutterWindow::OnDestroy() {
+  if (flutter_controller_) {
+    flutter_controller_ = nullptr;
+  }
+
+  Win32Window::OnDestroy();
+}
+
+LRESULT
+FlutterWindow::MessageHandler(HWND hwnd, UINT const message,
+                              WPARAM const wparam,
+                              LPARAM const lparam) noexcept {
+  // Give Flutter, including plugins, an opportunity to handle window messages.
+  if (flutter_controller_) {
+    std::optional<LRESULT> result =
+        flutter_controller_->HandleTopLevelWindowProc(hwnd, message, wparam,
+                                                      lparam);
+    if (result) {
+      return *result;
+    }
+  }
+
+  switch (message) {
+    case WM_FONTCHANGE:
+      flutter_controller_->engine()->ReloadSystemFonts();
+      break;
+    case WM_SETTINGCHANGE:
+      if (lparam &&
+          wcscmp(reinterpret_cast<LPCWSTR>(lparam), L"ImmersiveColorSet") == 0) {
+        ApplyDarkTitleBar(hwnd);
+      }
+      break;
+  }
+
+  return Win32Window::MessageHandler(hwnd, message, wparam, lparam);
+}