[windows] Implement popUpWindowMenu metnod #141

Author: lijy91

example/lib/pages/home.dart

@@ -763,6 +763,12 @@ class _HomePageState extends State<HomePage> with TrayListener, WindowListener {
                 setState(() {});
               },
             ),
+            PreferenceListItem(
+              title: Text('popUpWindowMenu'),
+              onTap: () async {
+                await windowManager.popUpWindowMenu();
+              },
+            ),
             PreferenceListItem(
               title: Text('createSubWindow'),
               onTap: () async {

lib/src/window_manager.dart

@@ -646,6 +646,11 @@ class WindowManager {
     await _channel.invokeMethod('setIgnoreMouseEvents', arguments);
   }
 
+  Future<void> popUpWindowMenu() async {
+    final Map<String, dynamic> arguments = {};
+    await _channel.invokeMethod('popUpWindowMenu', arguments);
+  }
+
   /// Starts a window drag based on the specified mouse-down event.
   Future<void> startDragging() async {
     await _channel.invokeMethod('startDragging');

windows/window_manager.cpp

@@ -102,6 +102,7 @@ class WindowManager {
   void WindowManager::SetOpacity(const flutter::EncodableMap& args);
   void WindowManager::SetBrightness(const flutter::EncodableMap& args);
   void WindowManager::SetIgnoreMouseEvents(const flutter::EncodableMap& args);
+  void WindowManager::PopUpWindowMenu(const flutter::EncodableMap& args);
   void WindowManager::StartDragging();
   void WindowManager::StartResizing(const flutter::EncodableMap& args);
   flutter::EncodableMap WindowManager::GetPrimaryDisplay(
@@ -704,6 +705,26 @@ void WindowManager::SetIgnoreMouseEvents(const flutter::EncodableMap& args) {
   ::SetWindowLong(hwnd, GWL_EXSTYLE, ex_style);
 }
 
+void WindowManager::PopUpWindowMenu(const flutter::EncodableMap& args) {
+  HWND hWnd = GetMainWindow();
+  HMENU hMenu = GetSystemMenu(hWnd, false);
+
+  double x, y;
+
+  POINT cursorPos;
+  GetCursorPos(&cursorPos);
+  x = cursorPos.x;
+  y = cursorPos.y;
+
+  int cmd =
+      TrackPopupMenu(hMenu, TPM_LEFTBUTTON | TPM_RIGHTBUTTON | TPM_RETURNCMD,
+                     static_cast<int>(x), static_cast<int>(y), 0, hWnd, NULL);
+
+  if (cmd) {
+    PostMessage(hWnd, WM_SYSCOMMAND, cmd, 0);
+  }
+}
+
 void WindowManager::StartDragging() {
   ReleaseCapture();
   SendMessage(GetMainWindow(), WM_SYSCOMMAND, SC_MOVE | HTCAPTION, 0);

windows/window_manager_plugin.cpp

@@ -496,6 +496,11 @@ void WindowManagerPlugin::HandleMethodCall(
         std::get<flutter::EncodableMap>(*method_call.arguments());
     window_manager->SetIgnoreMouseEvents(args);
     result->Success(flutter::EncodableValue(true));
+  } else if (method_name.compare("popUpWindowMenu") == 0) {
+    const flutter::EncodableMap& args =
+        std::get<flutter::EncodableMap>(*method_call.arguments());
+    window_manager->PopUpWindowMenu(args);
+    result->Success(flutter::EncodableValue(true));
   } else if (method_name.compare("startDragging") == 0) {
     window_manager->StartDragging();
     result->Success(flutter::EncodableValue(true));