add veilid flutter plugin skeleton

veilid-flutter/windows/.gitignore

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+flutter/
+
+# Visual Studio user-specific files.
+*.suo
+*.user
+*.userosscache
+*.sln.docstates
+
+# Visual Studio build-related files.
+x64/
+x86/
+
+# Visual Studio cache files
+# files ending in .cache can be ignored
+*.[Cc]ache
+# but keep track of directories ending in .cache
+!*.[Cc]ache/

veilid-flutter/windows/CMakeLists.txt

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+cmake_minimum_required(VERSION 3.14)
+set(PROJECT_NAME "veilid")
+project(${PROJECT_NAME} LANGUAGES CXX)
+
+# This value is used when generating builds using this plugin, so it must
+# not be changed
+set(PLUGIN_NAME "veilid_plugin")
+
+add_library(${PLUGIN_NAME} SHARED
+  "veilid_plugin.cpp"
+)
+apply_standard_settings(${PLUGIN_NAME})
+set_target_properties(${PLUGIN_NAME} PROPERTIES
+  CXX_VISIBILITY_PRESET hidden)
+target_compile_definitions(${PLUGIN_NAME} PRIVATE FLUTTER_PLUGIN_IMPL)
+target_include_directories(${PLUGIN_NAME} INTERFACE
+  "${CMAKE_CURRENT_SOURCE_DIR}/include")
+target_link_libraries(${PLUGIN_NAME} PRIVATE flutter flutter_wrapper_plugin)
+
+# List of absolute paths to libraries that should be bundled with the plugin
+set(veilid_bundled_libraries
+  ""
+  PARENT_SCOPE
+)

veilid-flutter/windows/include/veilid/veilid_plugin.h

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+#ifndef FLUTTER_PLUGIN_VEILID_PLUGIN_H_
+#define FLUTTER_PLUGIN_VEILID_PLUGIN_H_
+
+#include <flutter_plugin_registrar.h>
+
+#ifdef FLUTTER_PLUGIN_IMPL
+#define FLUTTER_PLUGIN_EXPORT __declspec(dllexport)
+#else
+#define FLUTTER_PLUGIN_EXPORT __declspec(dllimport)
+#endif
+
+#if defined(__cplusplus)
+extern "C" {
+#endif
+
+FLUTTER_PLUGIN_EXPORT void VeilidPluginRegisterWithRegistrar(
+    FlutterDesktopPluginRegistrarRef registrar);
+
+#if defined(__cplusplus)
+}  // extern "C"
+#endif
+
+#endif  // FLUTTER_PLUGIN_VEILID_PLUGIN_H_

veilid-flutter/windows/veilid_plugin.cpp

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+#include "include/veilid/veilid_plugin.h"
+
+// This must be included before many other Windows headers.
+#include <windows.h>
+
+// For getPlatformVersion; remove unless needed for your plugin implementation.
+#include <VersionHelpers.h>
+
+#include <flutter/method_channel.h>
+#include <flutter/plugin_registrar_windows.h>
+#include <flutter/standard_method_codec.h>
+
+#include <map>
+#include <memory>
+#include <sstream>
+
+namespace {
+
+class VeilidPlugin : public flutter::Plugin {
+ public:
+  static void RegisterWithRegistrar(flutter::PluginRegistrarWindows *registrar);
+
+  VeilidPlugin();
+
+  virtual ~VeilidPlugin();
+
+ private:
+  // Called when a method is called on this plugin's channel from Dart.
+  void HandleMethodCall(
+      const flutter::MethodCall<flutter::EncodableValue> &method_call,
+      std::unique_ptr<flutter::MethodResult<flutter::EncodableValue>> result);
+};
+
+// static
+void VeilidPlugin::RegisterWithRegistrar(
+    flutter::PluginRegistrarWindows *registrar) {
+  auto channel =
+      std::make_unique<flutter::MethodChannel<flutter::EncodableValue>>(
+          registrar->messenger(), "veilid",
+          &flutter::StandardMethodCodec::GetInstance());
+
+  auto plugin = std::make_unique<VeilidPlugin>();
+
+  channel->SetMethodCallHandler(
+      [plugin_pointer = plugin.get()](const auto &call, auto result) {
+        plugin_pointer->HandleMethodCall(call, std::move(result));
+      });
+
+  registrar->AddPlugin(std::move(plugin));
+}
+
+VeilidPlugin::VeilidPlugin() {}
+
+VeilidPlugin::~VeilidPlugin() {}
+
+void VeilidPlugin::HandleMethodCall(
+    const flutter::MethodCall<flutter::EncodableValue> &method_call,
+    std::unique_ptr<flutter::MethodResult<flutter::EncodableValue>> result) {
+  if (method_call.method_name().compare("getPlatformVersion") == 0) {
+    std::ostringstream version_stream;
+    version_stream << "Windows ";
+    if (IsWindows10OrGreater()) {
+      version_stream << "10+";
+    } else if (IsWindows8OrGreater()) {
+      version_stream << "8";
+    } else if (IsWindows7OrGreater()) {
+      version_stream << "7";
+    }
+    result->Success(flutter::EncodableValue(version_stream.str()));
+  } else {
+    result->NotImplemented();
+  }
+}
+
+}  // namespace
+
+void VeilidPluginRegisterWithRegistrar(
+    FlutterDesktopPluginRegistrarRef registrar) {
+  VeilidPlugin::RegisterWithRegistrar(
+      flutter::PluginRegistrarManager::GetInstance()
+          ->GetRegistrar<flutter::PluginRegistrarWindows>(registrar));
+}