Add windows implementation to platform_view example (#109715)

* Add Windows platform view example

* Add new tests for Windows desktop

* Add Windows platform view

* Use const constructors (linux analyze)\

* Fix spelling/format

* Clean up code

* Remove default case

examples/platform_view/lib/main.dart

@@ -3,7 +3,7 @@
 // found in the LICENSE file.
 
 import 'dart:async';
-import 'dart:io';
+import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
 
@@ -47,6 +47,21 @@ class _MyHomePageState extends State<MyHomePage> {
     });
   }
 
+  static Widget get _buttonText {
+    switch (defaultTargetPlatform) {
+      case TargetPlatform.android:
+        return const Text('Continue in Android view');
+      case TargetPlatform.iOS:
+        return const Text('Continue in iOS view');
+      case TargetPlatform.windows:
+        return const Text('Cotninue in Windows view');
+      case TargetPlatform.fuchsia:
+      case TargetPlatform.linux:
+      case TargetPlatform.macOS:
+        throw UnimplementedError('Platform not yet implemented');
+    }
+  }
+
   Future<void> _launchPlatformCount() async {
     final int? platformCounter =
         await _methodChannel.invokeMethod('switchView', _counter);
@@ -76,9 +91,7 @@ class _MyHomePageState extends State<MyHomePage> {
                       padding: const EdgeInsets.all(18.0),
                       child: ElevatedButton(
                         onPressed: _launchPlatformCount,
-                        child: Platform.isIOS
+                        child: _buttonText,
-                          ? const Text('Continue in iOS view')
-                          : const Text('Continue in Android view'),
                       ),
                     ),
                   ],

examples/platform_view/windows/CMakeLists.txt

@@ -60,6 +60,9 @@ add_subdirectory("runner")
 # them to the application.
 include(flutter/generated_plugins.cmake)
 
+target_include_directories(${BINARY_NAME} INTERFACE
+  "${CMAKE_CURRENT_SOURCE_DIR}/flutter")
+target_link_libraries(${BINARY_NAME} PRIVATE flutter flutter_wrapper_plugin)
 
 # === Installation ===
 # Support files are copied into place next to the executable, so that it can
@@ -84,6 +87,7 @@ install(FILES "${FLUTTER_ICU_DATA_FILE}" DESTINATION "${INSTALL_BUNDLE_DATA_DIR}
 install(FILES "${FLUTTER_LIBRARY}" DESTINATION "${INSTALL_BUNDLE_LIB_DIR}"
   COMPONENT Runtime)
 
+set(PLUGIN_BUNDLED_LIBRARIES)
 if(PLUGIN_BUNDLED_LIBRARIES)
   install(FILES "${PLUGIN_BUNDLED_LIBRARIES}"
     DESTINATION "${INSTALL_BUNDLE_LIB_DIR}"

examples/platform_view/windows/runner/flutter_window.cpp

@@ -4,10 +4,38 @@
 
 #include "flutter_window.h"
 
+#include <WinUser.h>
+#include <flutter/flutter_engine.h>
+#include <flutter/method_channel.h>
+#include <flutter/plugin_registrar_windows.h>
+#include <flutter/standard_method_codec.h>
+
+#include <cstdint>
+#include <memory>
 #include <optional>
+#include <string>
 
 #include "flutter/generated_plugin_registrant.h"
 
+void RegisterMethodChannel(flutter::FlutterEngine* engine) {
+  FlutterDesktopPluginRegistrarRef plugin_registrar_ref =
+      engine->GetRegistrarForPlugin("platform_view");
+  flutter::PluginRegistrarWindows* registrar =
+      flutter::PluginRegistrarManager::GetInstance()
+          ->GetRegistrar<flutter::PluginRegistrarWindows>(plugin_registrar_ref);
+  auto channel =
+      std::make_unique<flutter::MethodChannel<flutter::EncodableValue>>(
+          registrar->messenger(), "samples.flutter.io/platform_view",
+          &flutter::StandardMethodCodec::GetInstance());
+  channel->SetMethodCallHandler([](const auto& call, auto result) {
+    int counter = std::get<int32_t>(*call.arguments());
+    std::string msg = std::string("Pressed the button ") +
+                      std::to_string(counter) + " times!";
+    MessageBoxA(NULL, msg.c_str(), "Popup", MB_OK);
+    result->Success(flutter::EncodableValue(counter));
+  });
+}
+
 FlutterWindow::FlutterWindow(const flutter::DartProject& project)
     : project_(project) {}
 
@@ -29,6 +57,7 @@ bool FlutterWindow::OnCreate() {
     return false;
   }
   RegisterPlugins(flutter_controller_->engine());
+  RegisterMethodChannel(flutter_controller_->engine());
   SetChildContent(flutter_controller_->view()->GetNativeWindow());
   return true;
 }