init

2025-09-27 05:27:23 +00:00 · 2020-08-08 18:00:21 +08:00
commit 17d2876e36
64 changed files with 5377 additions and 0 deletions
--- a/example/.gitignore
+++ b/example/.gitignore
@@ -0,0 +1,41 @@
+# Miscellaneous
+*.class
+*.log
+*.pyc
+*.swp
+.DS_Store
+.atom/
+.buildlog/
+.history
+.svn/
+
+# IntelliJ related
+*.iml
+*.ipr
+*.iws
+.idea/
+
+# The .vscode folder contains launch configuration and tasks you configure in
+# VS Code which you may wish to be included in version control, so this line
+# is commented out by default.
+#.vscode/
+
+# Flutter/Dart/Pub related
+**/doc/api/
+**/ios/Flutter/.last_build_id
+.dart_tool/
+.flutter-plugins
+.flutter-plugins-dependencies
+.packages
+.pub-cache/
+.pub/
+/build/
+
+# Web related
+lib/generated_plugin_registrant.dart
+
+# Symbolication related
+app.*.symbols
+
+# Obfuscation related
+app.*.map.json
--- a/example/.metadata
+++ b/example/.metadata
@@ -0,0 +1,10 @@
+# This file tracks properties of this Flutter project.
+# Used by Flutter tool to assess capabilities and perform upgrades etc.
+#
+# This file should be version controlled and should not be manually edited.
+
+version:
+  revision: f3b7788f7754a51092ae1d677001767960c21910
+  channel: master
+
+project_type: app
--- a/example/README.md
+++ b/example/README.md
@@ -0,0 +1,16 @@
+# flutter_qjs_example
+
+Demonstrates how to use the flutter_qjs plugin.
+
+## Getting Started
+
+This project is a starting point for a Flutter application.
+
+A few resources to get you started if this is your first Flutter project:
+
+- [Lab: Write your first Flutter app](https://flutter.dev/docs/get-started/codelab)
+- [Cookbook: Useful Flutter samples](https://flutter.dev/docs/cookbook)
+
+For help getting started with Flutter, view our
+[online documentation](https://flutter.dev/docs), which offers tutorials,
+samples, guidance on mobile development, and a full API reference.
--- a/example/lib/code/editor.dart
+++ b/example/lib/code/editor.dart
@@ -0,0 +1,34 @@
+/*
+ * @Description: 
+ * @Author: ekibun
+ * @Date: 2020-08-01 13:20:06
+ * @LastEditors: ekibun
+ * @LastEditTime: 2020-08-08 17:52:22
+ */
+import 'package:flutter/cupertino.dart';
+import 'package:flutter/material.dart';
+import 'highlight.dart';
+
+class CodeEditor extends StatefulWidget {
+  final void Function(String) onChanged;
+
+  const CodeEditor({Key key, this.onChanged}) : super(key: key);
+  @override
+  _CodeEditorState createState() => _CodeEditorState();
+}
+
+class _CodeEditorState extends State<CodeEditor> {
+  CodeInputController _controller = CodeInputController();
+
+  @override
+  Widget build(BuildContext context) {
+    return TextField(
+      autofocus: true,
+      controller: _controller,
+      textCapitalization: TextCapitalization.none,
+      decoration: null,
+      maxLines: null,
+      onChanged: this.widget.onChanged,
+    );
+  }
+}
--- a/example/lib/code/highlight.dart
+++ b/example/lib/code/highlight.dart
@@ -0,0 +1,106 @@
+/*
+ * @Description: Code highlight controller
+ * @Author: ekibun
+ * @Date: 2020-08-01 17:42:06
+ * @LastEditors: ekibun
+ * @LastEditTime: 2020-08-02 12:39:26
+ */
+import 'dart:math';
+import 'dart:ui';
+import 'package:flutter/foundation.dart';
+import 'package:flutter/material.dart';
+import 'package:flutter_highlight/themes/a11y-light.dart';
+import 'package:highlight/highlight.dart';
+
+Map<String, TextStyle> _theme = a11yLightTheme;
+List<TextSpan> _convert(String code) {
+  var nodes = highlight.parse(code, language: 'javascript').nodes;
+  List<TextSpan> spans = [];
+  var currentSpans = spans;
+  List<List<TextSpan>> stack = [];
+
+  _traverse(Node node) {
+    if (node.value != null) {
+      currentSpans.add(node.className == null
+          ? TextSpan(text: node.value)
+          : TextSpan(text: node.value, style: _theme[node.className]));
+    } else if (node.children != null) {
+      List<TextSpan> tmp = [];
+      currentSpans.add(TextSpan(children: tmp, style: _theme[node.className]));
+      stack.add(currentSpans);
+      currentSpans = tmp;
+
+      node.children.forEach((n) {
+        _traverse(n);
+        if (n == node.children.last) {
+          currentSpans = stack.isEmpty ? spans : stack.removeLast();
+        }
+      });
+    }
+  }
+
+  for (var node in nodes) {
+    _traverse(node);
+  }
+
+  return spans;
+}
+
+class CodeInputController extends TextEditingController {
+  CodeInputController({String text}) : super(text: text);
+
+  TextSpan oldSpan = TextSpan();
+  Future<void> spanCall;
+
+  @override
+  TextSpan buildTextSpan({TextStyle style, bool withComposing}) {
+    String oldText = oldSpan.toPlainText();
+    String newText = value.text;
+    if (oldText == newText) return oldSpan;
+    (spanCall?.timeout(Duration.zero) ?? Future.delayed(Duration.zero))
+        .then((_) => spanCall = compute(_convert, value.text).then((lsSpan) {
+              TextSpan newSpan = TextSpan(style: style, children: lsSpan);
+              if (newSpan.toPlainText() == value.text) oldSpan = newSpan;
+              notifyListeners();
+            }))
+        .catchError((_) => {});
+
+    List<TextSpan> beforeSpans = [];
+    int splitAt = value.selection.start;
+    if (splitAt < 0) splitAt = newText.length ~/ 2;
+    int start = 0;
+    InlineSpan leftSpan;
+    oldSpan.children?.indexWhere((element) {
+      String elementText = element.toPlainText();
+      if (start + elementText.length > splitAt || !newText.startsWith(elementText, start)) {
+        leftSpan = element;
+        return true;
+      }
+      beforeSpans.add(element);
+      start += elementText.length;
+      return false;
+    });
+    List<TextSpan> endSpans = [];
+    int end = 0;
+    InlineSpan rightSpan;
+    oldSpan.children?.sublist(beforeSpans.length)?.lastIndexWhere((element) {
+      String elementText = element.toPlainText();
+      if (splitAt + end + elementText.length >= newText.length ||
+          !newText.substring(start, newText.length - end).endsWith(elementText)) {
+        rightSpan = element;
+        return true;
+      }
+      endSpans.add(element);
+      end += elementText.length;
+      return false;
+    });
+
+    return TextSpan(style: style, children: [
+      ...beforeSpans,
+      TextSpan(
+          style: leftSpan != null && leftSpan == rightSpan ? leftSpan.style : style,
+          text: newText.substring(start, max(start, newText.length - end))),
+      ...endSpans.reversed
+    ]);
+  }
+}
--- a/example/lib/main.dart
+++ b/example/lib/main.dart
@@ -0,0 +1,39 @@
+/*
+ * @Description: 
+ * @Author: ekibun
+ * @Date: 2020-08-08 08:16:51
+ * @LastEditors: ekibun
+ * @LastEditTime: 2020-08-08 17:50:30
+ */
+import 'package:flutter/material.dart';
+
+import 'package:flutter_qjs_example/test.dart';
+
+void main() {
+  runApp(MyApp());
+}
+
+class MyApp extends StatelessWidget {
+
+  const MyApp({ Key key }) : super(key: key);
+
+  @override
+  Widget build(BuildContext context) {
+    return MaterialApp(
+      title: 'flutter_qjs',
+      debugShowCheckedModeBanner: false,
+      theme: ThemeData(
+        appBarTheme: AppBarTheme(brightness: Brightness.dark, elevation: 0),
+        primaryColor: Color(0xfff09199),
+        accentColor: Color(0xffec818a),
+        backgroundColor: Colors.grey[300],
+        primaryColorBrightness: Brightness.dark,
+      ),
+      routes: {
+        'home': (BuildContext context) => TestPage(),
+      },
+      initialRoute: 'home',
+    );
+  }
+
+}
--- a/example/lib/test.dart
+++ b/example/lib/test.dart
@@ -0,0 +1,102 @@
+/*
+ * @Description: 
+ * @Author: ekibun
+ * @Date: 2020-07-18 23:28:55
+ * @LastEditors: ekibun
+ * @LastEditTime: 2020-08-08 17:38:48
+ */ 
+import 'package:dio/dio.dart';
+import 'package:flutter/material.dart';
+import 'package:flutter_qjs/flutter_qjs.dart';
+
+import 'code/editor.dart';
+
+class TestPage extends StatefulWidget {
+  @override
+  State<StatefulWidget> createState() => _TestPageState();
+}
+
+class _TestPageState extends State<TestPage> {
+
+  String code, resp;
+  int engine;
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(
+        title: Text("JS 引擎功能测试"),
+      ),
+      body: SingleChildScrollView(
+        padding: const EdgeInsets.all(16),
+        child: Column(
+          crossAxisAlignment: CrossAxisAlignment.start,
+          children: [
+            SingleChildScrollView(
+              scrollDirection: Axis.horizontal,
+              child: Row(
+                children: [
+                  FlatButton(child: Text("初始化引擎"), onPressed: () async {
+                    if ((engine?? 0) != 0) return;
+                    engine = await FlutterJs.initEngine();
+                    // dart 函数回调
+                    FlutterJs.methodHandler = (String method, List arg) async {
+                      switch (method) {
+                        case "delay":
+                          await Future.delayed(Duration(milliseconds: arg[0]));
+                          return;
+                        case "http":
+                          Response response = await Dio().get(arg[0]);
+                          return response.data;
+                        default:
+                      }
+                    };
+                  }),
+                  FlatButton(child: Text("运行"), onPressed: () async {
+                    if ((engine?? 0) == 0) {
+                      print("请先初始化引擎");
+                      return;
+                    }
+                    try {
+                      resp = await FlutterJs.evaluate(code ?? '', "<eval>");
+                    } catch(e) {
+                      resp = e.toString();
+                    }
+                    setState(() {
+                      code = code;
+                    });
+                  }),
+                  FlatButton(child: Text("释放引擎"), onPressed: () async {
+                    if ((engine?? 0) == 0) return;
+                    await FlutterJs.close();
+                    engine = 0;
+                  }),
+                ],
+              ),
+            ),
+            Container(
+              padding: const EdgeInsets.all(12),
+              color: Colors.grey.withOpacity(0.1),
+              constraints: BoxConstraints(minHeight: 200),
+              child: CodeEditor(
+                onChanged: (v) {
+                  code = v;
+                },
+              ),
+            ),
+            SizedBox(height: 16),
+            Text("运行结果："),
+            SizedBox(height: 16),
+            Container(
+              width: double.infinity,
+              padding: const EdgeInsets.all(12),
+              color: Colors.green.withOpacity(0.05),
+              constraints: BoxConstraints(minHeight: 100),
+              child: Text(resp ?? ''),
+            ),
+          ],
+        ),
+      ),
+    );
+  }
+}
--- a/example/pubspec.lock
+++ b/example/pubspec.lock
@@ -0,0 +1,182 @@
+# Generated by pub
+# See https://dart.dev/tools/pub/glossary#lockfile
+packages:
+  async:
+    dependency: transitive
+    description:
+      name: async
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "2.5.0-nullsafety"
+  boolean_selector:
+    dependency: transitive
+    description:
+      name: boolean_selector
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "2.1.0-nullsafety"
+  characters:
+    dependency: transitive
+    description:
+      name: characters
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "1.1.0-nullsafety.2"
+  charcode:
+    dependency: transitive
+    description:
+      name: charcode
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "1.2.0-nullsafety"
+  clock:
+    dependency: transitive
+    description:
+      name: clock
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "1.1.0-nullsafety"
+  collection:
+    dependency: transitive
+    description:
+      name: collection
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "1.15.0-nullsafety.2"
+  dio:
+    dependency: "direct main"
+    description:
+      name: dio
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "3.0.10"
+  fake_async:
+    dependency: transitive
+    description:
+      name: fake_async
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "1.1.0-nullsafety"
+  flutter:
+    dependency: "direct main"
+    description: flutter
+    source: sdk
+    version: "0.0.0"
+  flutter_highlight:
+    dependency: "direct main"
+    description:
+      name: flutter_highlight
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "0.6.0"
+  flutter_qjs:
+    dependency: "direct main"
+    description:
+      path: ".."
+      relative: true
+    source: path
+    version: "0.0.1"
+  flutter_test:
+    dependency: "direct dev"
+    description: flutter
+    source: sdk
+    version: "0.0.0"
+  highlight:
+    dependency: "direct main"
+    description:
+      name: highlight
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "0.6.0"
+  http_parser:
+    dependency: transitive
+    description:
+      name: http_parser
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "3.1.4"
+  matcher:
+    dependency: transitive
+    description:
+      name: matcher
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "0.12.10-nullsafety"
+  meta:
+    dependency: transitive
+    description:
+      name: meta
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "1.3.0-nullsafety.2"
+  path:
+    dependency: transitive
+    description:
+      name: path
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "1.8.0-nullsafety"
+  sky_engine:
+    dependency: transitive
+    description: flutter
+    source: sdk
+    version: "0.0.99"
+  source_span:
+    dependency: transitive
+    description:
+      name: source_span
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "1.8.0-nullsafety"
+  stack_trace:
+    dependency: transitive
+    description:
+      name: stack_trace
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "1.10.0-nullsafety"
+  stream_channel:
+    dependency: transitive
+    description:
+      name: stream_channel
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "2.1.0-nullsafety"
+  string_scanner:
+    dependency: transitive
+    description:
+      name: string_scanner
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "1.1.0-nullsafety"
+  term_glyph:
+    dependency: transitive
+    description:
+      name: term_glyph
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "1.2.0-nullsafety"
+  test_api:
+    dependency: transitive
+    description:
+      name: test_api
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "0.2.19-nullsafety"
+  typed_data:
+    dependency: transitive
+    description:
+      name: typed_data
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "1.3.0-nullsafety.2"
+  vector_math:
+    dependency: transitive
+    description:
+      name: vector_math
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "2.1.0-nullsafety.2"
+sdks:
+  dart: ">=2.10.0-0.0.dev <2.10.0"
+  flutter: ">=1.20.0 <2.0.0"
--- a/example/pubspec.yaml
+++ b/example/pubspec.yaml
@@ -0,0 +1,71 @@
+name: flutter_qjs_example
+description: Demonstrates how to use the flutter_qjs plugin.
+
+# The following line prevents the package from being accidentally published to
+# pub.dev using `pub publish`. This is preferred for private packages.
+publish_to: 'none' # Remove this line if you wish to publish to pub.dev
+
+environment:
+  sdk: ">=2.7.0 <3.0.0"
+
+dependencies:
+  flutter:
+    sdk: flutter
+
+  flutter_qjs:
+    # When depending on this package from a real application you should use:
+    #   flutter_qjs: ^x.y.z
+    # See https://dart.dev/tools/pub/dependencies#version-constraints
+    # The example app is bundled with the plugin so we use a path dependency on
+    # the parent directory to use the current plugin's version.
+    path: ../
+
+  highlight: 0.6.0
+  flutter_highlight: 0.6.0
+  dio: 3.0.10
+
+dev_dependencies:
+  flutter_test:
+    sdk: flutter
+
+# For information on the generic Dart part of this file, see the
+# following page: https://dart.dev/tools/pub/pubspec
+
+# The following section is specific to Flutter.
+flutter:
+
+  # The following line ensures that the Material Icons font is
+  # included with your application, so that you can use the icons in
+  # the material Icons class.
+  uses-material-design: true
+
+  # To add assets to your application, add an assets section, like this:
+  # assets:
+  #   - images/a_dot_burr.jpeg
+  #   - images/a_dot_ham.jpeg
+
+  # An image asset can refer to one or more resolution-specific "variants", see
+  # https://flutter.dev/assets-and-images/#resolution-aware.
+
+  # For details regarding adding assets from package dependencies, see
+  # https://flutter.dev/assets-and-images/#from-packages
+
+  # To add custom fonts to your application, add a fonts section here,
+  # in this "flutter" section. Each entry in this list should have a
+  # "family" key with the font family name, and a "fonts" key with a
+  # list giving the asset and other descriptors for the font. For
+  # example:
+  # fonts:
+  #   - family: Schyler
+  #     fonts:
+  #       - asset: fonts/Schyler-Regular.ttf
+  #       - asset: fonts/Schyler-Italic.ttf
+  #         style: italic
+  #   - family: Trajan Pro
+  #     fonts:
+  #       - asset: fonts/TrajanPro.ttf
+  #       - asset: fonts/TrajanPro_Bold.ttf
+  #         weight: 700
+  #
+  # For details regarding fonts from package dependencies,
+  # see https://flutter.dev/custom-fonts/#from-packages
--- a/example/test/widget_test.dart
+++ b/example/test/widget_test.dart
@@ -0,0 +1,27 @@
+// This is a basic Flutter widget test.
+//
+// To perform an interaction with a widget in your test, use the WidgetTester
+// utility that Flutter provides. For example, you can send tap and scroll
+// gestures. You can also use WidgetTester to find child widgets in the widget
+// tree, read text, and verify that the values of widget properties are correct.
+
+import 'package:flutter/material.dart';
+import 'package:flutter_test/flutter_test.dart';
+
+import 'package:flutter_qjs_example/main.dart';
+
+void main() {
+  testWidgets('Verify Platform version', (WidgetTester tester) async {
+    // Build our app and trigger a frame.
+    await tester.pumpWidget(MyApp());
+
+    // Verify that platform version is retrieved.
+    expect(
+      find.byWidgetPredicate(
+        (Widget widget) => widget is Text &&
+                           widget.data.startsWith('Running on:'),
+      ),
+      findsOneWidget,
+    );
+  });
+}
--- a/example/windows/.gitignore
+++ b/example/windows/.gitignore
@@ -0,0 +1,17 @@
+flutter/ephemeral/
+
+# 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/
--- a/example/windows/CMakeLists.txt
+++ b/example/windows/CMakeLists.txt
@@ -0,0 +1,95 @@
+cmake_minimum_required(VERSION 3.15)
+project(flutter_qjs_example LANGUAGES CXX)
+
+set(BINARY_NAME "flutter_qjs_example")
+
+cmake_policy(SET CMP0063 NEW)
+
+set(CMAKE_INSTALL_RPATH "$ORIGIN/lib")
+
+# Configure build options.
+get_property(IS_MULTICONFIG GLOBAL PROPERTY GENERATOR_IS_MULTI_CONFIG)
+if(IS_MULTICONFIG)
+  set(CMAKE_CONFIGURATION_TYPES "Debug;Profile;Release"
+    CACHE STRING "" FORCE)
+else()
+  if(NOT CMAKE_BUILD_TYPE AND NOT CMAKE_CONFIGURATION_TYPES)
+    set(CMAKE_BUILD_TYPE "Debug" CACHE
+      STRING "Flutter build mode" FORCE)
+    set_property(CACHE CMAKE_BUILD_TYPE PROPERTY STRINGS
+      "Debug" "Profile" "Release")
+  endif()
+endif()
+
+set(CMAKE_EXE_LINKER_FLAGS_PROFILE "${CMAKE_EXE_LINKER_FLAGS_RELEASE}")
+set(CMAKE_SHARED_LINKER_FLAGS_PROFILE "${CMAKE_SHARED_LINKER_FLAGS_RELEASE}")
+set(CMAKE_C_FLAGS_PROFILE "${CMAKE_C_FLAGS_RELEASE}")
+set(CMAKE_CXX_FLAGS_PROFILE "${CMAKE_CXX_FLAGS_RELEASE}")
+
+# Use Unicode for all projects.
+add_definitions(-DUNICODE -D_UNICODE)
+
+# Compilation settings that should be applied to most targets.
+function(APPLY_STANDARD_SETTINGS TARGET)
+  target_compile_features(${TARGET} PUBLIC cxx_std_17)
+  target_compile_options(${TARGET} PRIVATE /W4 /WX- /wd"4100")
+  target_compile_options(${TARGET} PRIVATE /EHsc)
+  target_compile_definitions(${TARGET} PRIVATE "_HAS_EXCEPTIONS=0")
+  target_compile_definitions(${TARGET} PRIVATE "$<$<CONFIG:Debug>:_DEBUG>")
+endfunction()
+
+set(FLUTTER_MANAGED_DIR "${CMAKE_CURRENT_SOURCE_DIR}/flutter")
+
+# Flutter library and tool build rules.
+add_subdirectory(${FLUTTER_MANAGED_DIR})
+
+# Application build
+add_subdirectory("runner")
+
+# Generated plugin build rules, which manage building the plugins and adding
+# them to the application.
+include(flutter/generated_plugins.cmake)
+
+
+# === Installation ===
+# Support files are copied into place next to the executable, so that it can
+# run in place. This is done instead of making a separate bundle (as on Linux)
+# so that building and running from within Visual Studio will work.
+set(BUILD_BUNDLE_DIR "$<TARGET_FILE_DIR:${BINARY_NAME}>")
+# Make the "install" step default, as it's required to run.
+set(CMAKE_VS_INCLUDE_INSTALL_TO_DEFAULT_BUILD 1)
+if(CMAKE_INSTALL_PREFIX_INITIALIZED_TO_DEFAULT)
+  set(CMAKE_INSTALL_PREFIX "${BUILD_BUNDLE_DIR}" CACHE PATH "..." FORCE)
+endif()
+
+set(INSTALL_BUNDLE_DATA_DIR "${CMAKE_INSTALL_PREFIX}/data")
+set(INSTALL_BUNDLE_LIB_DIR "${CMAKE_INSTALL_PREFIX}")
+
+install(TARGETS ${BINARY_NAME} RUNTIME DESTINATION "${CMAKE_INSTALL_PREFIX}"
+  COMPONENT Runtime)
+
+install(FILES "${FLUTTER_ICU_DATA_FILE}" DESTINATION "${INSTALL_BUNDLE_DATA_DIR}"
+  COMPONENT Runtime)
+
+install(FILES "${FLUTTER_LIBRARY}" DESTINATION "${INSTALL_BUNDLE_LIB_DIR}"
+  COMPONENT Runtime)
+
+if(PLUGIN_BUNDLED_LIBRARIES)
+  install(FILES "${PLUGIN_BUNDLED_LIBRARIES}"
+    DESTINATION "${INSTALL_BUNDLE_LIB_DIR}"
+    COMPONENT Runtime)
+endif()
+
+# Fully re-copy the assets directory on each build to avoid having stale files
+# from a previous install.
+set(FLUTTER_ASSET_DIR_NAME "flutter_assets")
+install(CODE "
+  file(REMOVE_RECURSE \"${INSTALL_BUNDLE_DATA_DIR}/${FLUTTER_ASSET_DIR_NAME}\")
+  " COMPONENT Runtime)
+install(DIRECTORY "${PROJECT_BUILD_DIR}/${FLUTTER_ASSET_DIR_NAME}"
+  DESTINATION "${INSTALL_BUNDLE_DATA_DIR}" COMPONENT Runtime)
+
+# Install the AOT library on non-Debug builds only.
+install(FILES "${AOT_LIBRARY}" DESTINATION "${INSTALL_BUNDLE_DATA_DIR}"
+  CONFIGURATIONS Profile;Release
+  COMPONENT Runtime)
--- a/example/windows/flutter/.template_version
+++ b/example/windows/flutter/.template_version
@@ -0,0 +1 @@
+4
--- a/example/windows/flutter/CMakeLists.txt
+++ b/example/windows/flutter/CMakeLists.txt
@@ -0,0 +1,98 @@
+cmake_minimum_required(VERSION 3.15)
+
+set(EPHEMERAL_DIR "${CMAKE_CURRENT_SOURCE_DIR}/ephemeral")
+
+# Configuration provided via flutter tool.
+include(${EPHEMERAL_DIR}/generated_config.cmake)
+
+# TODO: Move the rest of this into files in ephemeral. See
+# https://github.com/flutter/flutter/issues/57146.
+set(WRAPPER_ROOT "${EPHEMERAL_DIR}/cpp_client_wrapper")
+
+# === Flutter Library ===
+set(FLUTTER_LIBRARY "${EPHEMERAL_DIR}/flutter_windows.dll")
+
+# Published to parent scope for install step.
+set(FLUTTER_LIBRARY ${FLUTTER_LIBRARY} PARENT_SCOPE)
+set(FLUTTER_ICU_DATA_FILE "${EPHEMERAL_DIR}/icudtl.dat" PARENT_SCOPE)
+set(PROJECT_BUILD_DIR "${PROJECT_DIR}/build/" PARENT_SCOPE)
+set(AOT_LIBRARY "${PROJECT_DIR}/build/windows/app.so" PARENT_SCOPE)
+
+list(APPEND FLUTTER_LIBRARY_HEADERS
+  "flutter_export.h"
+  "flutter_windows.h"
+  "flutter_messenger.h"
+  "flutter_plugin_registrar.h"
+)
+list(TRANSFORM FLUTTER_LIBRARY_HEADERS PREPEND "${EPHEMERAL_DIR}/")
+add_library(flutter INTERFACE)
+target_include_directories(flutter INTERFACE
+  "${EPHEMERAL_DIR}"
+)
+target_link_libraries(flutter INTERFACE "${FLUTTER_LIBRARY}.lib")
+add_dependencies(flutter flutter_assemble)
+
+# === Wrapper ===
+list(APPEND CPP_WRAPPER_SOURCES_CORE
+  "engine_method_result.cc"
+	"standard_codec.cc"
+)
+list(TRANSFORM CPP_WRAPPER_SOURCES_CORE PREPEND "${WRAPPER_ROOT}/")
+list(APPEND CPP_WRAPPER_SOURCES_PLUGIN
+  "plugin_registrar.cc"
+)
+list(TRANSFORM CPP_WRAPPER_SOURCES_PLUGIN PREPEND "${WRAPPER_ROOT}/")
+list(APPEND CPP_WRAPPER_SOURCES_APP
+  "flutter_view_controller.cc"
+)
+list(TRANSFORM CPP_WRAPPER_SOURCES_APP PREPEND "${WRAPPER_ROOT}/")
+
+# Wrapper sources needed for a plugin.
+add_library(flutter_wrapper_plugin STATIC
+  ${CPP_WRAPPER_SOURCES_CORE}
+  ${CPP_WRAPPER_SOURCES_PLUGIN}
+)
+apply_standard_settings(flutter_wrapper_plugin)
+set_target_properties(flutter_wrapper_plugin PROPERTIES
+  POSITION_INDEPENDENT_CODE ON)
+set_target_properties(flutter_wrapper_plugin PROPERTIES
+  CXX_VISIBILITY_PRESET hidden)
+target_link_libraries(flutter_wrapper_plugin PUBLIC flutter)
+target_include_directories(flutter_wrapper_plugin PUBLIC
+  "${WRAPPER_ROOT}/include"
+)
+add_dependencies(flutter_wrapper_plugin flutter_assemble)
+
+# Wrapper sources needed for the runner.
+add_library(flutter_wrapper_app STATIC
+  ${CPP_WRAPPER_SOURCES_CORE}
+  ${CPP_WRAPPER_SOURCES_APP}
+)
+apply_standard_settings(flutter_wrapper_app)
+target_link_libraries(flutter_wrapper_app PUBLIC flutter)
+target_include_directories(flutter_wrapper_app PUBLIC
+  "${WRAPPER_ROOT}/include"
+)
+add_dependencies(flutter_wrapper_app flutter_assemble)
+
+# === Flutter tool backend ===
+# _phony_ is a non-existent file to force this command to run every time,
+# since currently there's no way to get a full input/output list from the
+# flutter tool.
+add_custom_command(
+  OUTPUT ${FLUTTER_LIBRARY} ${FLUTTER_LIBRARY_HEADERS}
+    ${CPP_WRAPPER_SOURCES_CORE} ${CPP_WRAPPER_SOURCES_PLUGIN}
+    ${CPP_WRAPPER_SOURCES_APP}
+    ${CMAKE_CURRENT_BINARY_DIR}/_phony_
+  COMMAND ${CMAKE_COMMAND} -E env
+    ${FLUTTER_TOOL_ENVIRONMENT}
+    "${FLUTTER_ROOT}/packages/flutter_tools/bin/tool_backend.bat"
+      windows-x64 $<CONFIG>
+)
+add_custom_target(flutter_assemble DEPENDS
+  "${FLUTTER_LIBRARY}"
+  ${FLUTTER_LIBRARY_HEADERS}
+  ${CPP_WRAPPER_SOURCES_CORE}
+  ${CPP_WRAPPER_SOURCES_PLUGIN}
+  ${CPP_WRAPPER_SOURCES_APP}
+)
--- a/example/windows/flutter/generated_plugin_registrant.cc
+++ b/example/windows/flutter/generated_plugin_registrant.cc
@@ -0,0 +1,12 @@
+//
+//  Generated file. Do not edit.
+//
+
+#include "generated_plugin_registrant.h"
+
+#include <flutter_qjs/flutter_qjs_plugin.h>
+
+void RegisterPlugins(flutter::PluginRegistry* registry) {
+  FlutterQjsPluginRegisterWithRegistrar(
+      registry->GetRegistrarForPlugin("FlutterQjsPlugin"));
+}
--- a/example/windows/flutter/generated_plugin_registrant.h
+++ b/example/windows/flutter/generated_plugin_registrant.h
@@ -0,0 +1,13 @@
+//
+//  Generated file. Do not edit.
+//
+
+#ifndef GENERATED_PLUGIN_REGISTRANT_
+#define GENERATED_PLUGIN_REGISTRANT_
+
+#include <flutter/plugin_registry.h>
+
+// Registers Flutter plugins.
+void RegisterPlugins(flutter::PluginRegistry* registry);
+
+#endif  // GENERATED_PLUGIN_REGISTRANT_
--- a/example/windows/flutter/generated_plugins.cmake
+++ b/example/windows/flutter/generated_plugins.cmake
@@ -0,0 +1,16 @@
+#
+# Generated file, do not edit.
+#
+
+list(APPEND FLUTTER_PLUGIN_LIST
+  flutter_qjs
+)
+
+set(PLUGIN_BUNDLED_LIBRARIES)
+
+foreach(plugin ${FLUTTER_PLUGIN_LIST})
+  add_subdirectory(flutter/ephemeral/.plugin_symlinks/${plugin}/windows plugins/${plugin})
+  target_link_libraries(${BINARY_NAME} PRIVATE ${plugin}_plugin)
+  list(APPEND PLUGIN_BUNDLED_LIBRARIES $<TARGET_FILE:${plugin}_plugin>)
+  list(APPEND PLUGIN_BUNDLED_LIBRARIES ${${plugin}_bundled_libraries})
+endforeach(plugin)
--- a/example/windows/runner/CMakeLists.txt
+++ b/example/windows/runner/CMakeLists.txt
@@ -0,0 +1,18 @@
+cmake_minimum_required(VERSION 3.15)
+project(runner LANGUAGES CXX)
+
+add_executable(${BINARY_NAME} WIN32
+  "flutter_window.cpp"
+  "main.cpp"
+  "run_loop.cpp"
+  "utils.cpp"
+  "win32_window.cpp"
+  "window_configuration.cpp"
+  "${FLUTTER_MANAGED_DIR}/generated_plugin_registrant.cc"
+  "Runner.rc"
+  "runner.exe.manifest"
+)
+apply_standard_settings(${BINARY_NAME})
+target_link_libraries(${BINARY_NAME} PRIVATE flutter flutter_wrapper_app)
+target_include_directories(${BINARY_NAME} PRIVATE "${CMAKE_SOURCE_DIR}")
+add_dependencies(${BINARY_NAME} flutter_assemble)
--- a/example/windows/runner/Runner.rc
+++ b/example/windows/runner/Runner.rc
@@ -0,0 +1,70 @@
+// Microsoft Visual C++ generated resource script.
+//
+#pragma code_page(65001)
+#include "resource.h"
+
+#define APSTUDIO_READONLY_SYMBOLS
+/////////////////////////////////////////////////////////////////////////////
+//
+// Generated from the TEXTINCLUDE 2 resource.
+//
+#include "winres.h"
+
+/////////////////////////////////////////////////////////////////////////////
+#undef APSTUDIO_READONLY_SYMBOLS
+
+/////////////////////////////////////////////////////////////////////////////
+// English (United States) resources
+
+#if !defined(AFX_RESOURCE_DLL) || defined(AFX_TARG_ENU)
+LANGUAGE LANG_ENGLISH, SUBLANG_ENGLISH_US
+
+#ifdef APSTUDIO_INVOKED
+/////////////////////////////////////////////////////////////////////////////
+//
+// TEXTINCLUDE
+//
+
+1 TEXTINCLUDE
+BEGIN
+    "resource.h\0"
+END
+
+2 TEXTINCLUDE
+BEGIN
+    "#include ""winres.h""\r\n"
+    "\0"
+END
+
+3 TEXTINCLUDE
+BEGIN
+    "\r\n"
+    "\0"
+END
+
+#endif    // APSTUDIO_INVOKED
+
+
+/////////////////////////////////////////////////////////////////////////////
+//
+// Icon
+//
+
+// Icon with lowest ID value placed first to ensure application icon
+// remains consistent on all systems.
+IDI_APP_ICON            ICON                    "resources\\app_icon.ico"
+
+#endif    // English (United States) resources
+/////////////////////////////////////////////////////////////////////////////
+
+
+
+#ifndef APSTUDIO_INVOKED
+/////////////////////////////////////////////////////////////////////////////
+//
+// Generated from the TEXTINCLUDE 3 resource.
+//
+
+
+/////////////////////////////////////////////////////////////////////////////
+#endif    // not APSTUDIO_INVOKED
--- a/example/windows/runner/flutter_window.cpp
+++ b/example/windows/runner/flutter_window.cpp
@@ -0,0 +1,29 @@
+#include "flutter_window.h"
+
+#include "flutter/generated_plugin_registrant.h"
+
+FlutterWindow::FlutterWindow(RunLoop* run_loop,
+                             const flutter::DartProject& project)
+    : run_loop_(run_loop), project_(project) {}
+
+FlutterWindow::~FlutterWindow() {}
+
+void FlutterWindow::OnCreate() {
+  Win32Window::OnCreate();
+
+  // The size here is arbitrary since SetChildContent will resize it.
+  flutter_controller_ =
+      std::make_unique<flutter::FlutterViewController>(100, 100, project_);
+  RegisterPlugins(flutter_controller_.get());
+  run_loop_->RegisterFlutterInstance(flutter_controller_.get());
+  SetChildContent(flutter_controller_->view()->GetNativeWindow());
+}
+
+void FlutterWindow::OnDestroy() {
+  if (flutter_controller_) {
+    run_loop_->UnregisterFlutterInstance(flutter_controller_.get());
+    flutter_controller_ = nullptr;
+  }
+
+  Win32Window::OnDestroy();
+}
--- a/example/windows/runner/flutter_window.h
+++ b/example/windows/runner/flutter_window.h
@@ -0,0 +1,37 @@
+#ifndef FLUTTER_WINDOW_H_
+#define FLUTTER_WINDOW_H_
+
+#include <flutter/dart_project.h>
+#include <flutter/flutter_view_controller.h>
+
+#include "run_loop.h"
+#include "win32_window.h"
+
+#include <memory>
+
+// A window that does nothing but host a Flutter view.
+class FlutterWindow : public Win32Window {
+ public:
+  // Creates a new FlutterWindow driven by the |run_loop|, hosting a
+  // Flutter view running |project|.
+  explicit FlutterWindow(RunLoop* run_loop,
+                         const flutter::DartProject& project);
+  virtual ~FlutterWindow();
+
+ protected:
+  // Win32Window:
+  void OnCreate() override;
+  void OnDestroy() override;
+
+ private:
+  // The run loop driving events for this window.
+  RunLoop* run_loop_;
+
+  // The project to run.
+  flutter::DartProject project_;
+
+  // The Flutter instance hosted by this window.
+  std::unique_ptr<flutter::FlutterViewController> flutter_controller_;
+};
+
+#endif  // FLUTTER_WINDOW_H_
--- a/example/windows/runner/main.cpp
+++ b/example/windows/runner/main.cpp
@@ -0,0 +1,37 @@
+#include <flutter/dart_project.h>
+#include <flutter/flutter_view_controller.h>
+#include <windows.h>
+
+#include "flutter_window.h"
+#include "run_loop.h"
+#include "utils.h"
+#include "window_configuration.h"
+
+int APIENTRY wWinMain(_In_ HINSTANCE instance, _In_opt_ HINSTANCE prev,
+                      _In_ wchar_t *command_line, _In_ int show_command) {
+  // Attach to console when present (e.g., 'flutter run') or create a
+  // new console when running with a debugger.
+  if (!::AttachConsole(ATTACH_PARENT_PROCESS) && ::IsDebuggerPresent()) {
+    CreateAndAttachConsole();
+  }
+
+  // Initialize COM, so that it is available for use in the library and/or
+  // plugins.
+  ::CoInitializeEx(nullptr, COINIT_APARTMENTTHREADED);
+
+  RunLoop run_loop;
+
+  flutter::DartProject project(L"data");
+  FlutterWindow window(&run_loop, project);
+  Win32Window::Point origin(kFlutterWindowOriginX, kFlutterWindowOriginY);
+  Win32Window::Size size(kFlutterWindowWidth, kFlutterWindowHeight);
+  if (!window.CreateAndShow(kFlutterWindowTitle, origin, size)) {
+    return EXIT_FAILURE;
+  }
+  window.SetQuitOnClose(true);
+
+  run_loop.Run();
+
+  ::CoUninitialize();
+  return EXIT_SUCCESS;
+}
--- a/example/windows/runner/resource.h
+++ b/example/windows/runner/resource.h
@@ -0,0 +1,16 @@
+//{{NO_DEPENDENCIES}}
+// Microsoft Visual C++ generated include file.
+// Used by Runner.rc
+//
+#define IDI_APP_ICON                    101
+
+// Next default values for new objects
+//
+#ifdef APSTUDIO_INVOKED
+#ifndef APSTUDIO_READONLY_SYMBOLS
+#define _APS_NEXT_RESOURCE_VALUE        102
+#define _APS_NEXT_COMMAND_VALUE         40001
+#define _APS_NEXT_CONTROL_VALUE         1001
+#define _APS_NEXT_SYMED_VALUE           101
+#endif
+#endif
--- a/example/windows/runner/resources/app_icon.ico
+++ b/example/windows/runner/resources/app_icon.ico
--- a/example/windows/runner/run_loop.cpp
+++ b/example/windows/runner/run_loop.cpp
@@ -0,0 +1,70 @@
+#include "run_loop.h"
+
+#include <Windows.h>
+// Don't stomp std::min/std::max
+#undef max
+#undef min
+
+#include <algorithm>
+
+RunLoop::RunLoop() {}
+
+RunLoop::~RunLoop() {}
+
+void RunLoop::Run() {
+  bool keep_running = true;
+  TimePoint next_flutter_event_time = TimePoint::clock::now();
+  while (keep_running) {
+    std::chrono::nanoseconds wait_duration =
+        std::max(std::chrono::nanoseconds(0),
+                 next_flutter_event_time - TimePoint::clock::now());
+    ::MsgWaitForMultipleObjects(
+        0, nullptr, FALSE, static_cast<DWORD>(wait_duration.count() / 1000),
+        QS_ALLINPUT);
+    bool processed_events = false;
+    MSG message;
+    // All pending Windows messages must be processed; MsgWaitForMultipleObjects
+    // won't return again for items left in the queue after PeekMessage.
+    while (::PeekMessage(&message, nullptr, 0, 0, PM_REMOVE)) {
+      processed_events = true;
+      if (message.message == WM_QUIT) {
+        keep_running = false;
+        break;
+      }
+      ::TranslateMessage(&message);
+      ::DispatchMessage(&message);
+      // Allow Flutter to process messages each time a Windows message is
+      // processed, to prevent starvation.
+      next_flutter_event_time =
+          std::min(next_flutter_event_time, ProcessFlutterMessages());
+    }
+    // If the PeekMessage loop didn't run, process Flutter messages.
+    if (!processed_events) {
+      next_flutter_event_time =
+          std::min(next_flutter_event_time, ProcessFlutterMessages());
+    }
+  }
+}
+
+void RunLoop::RegisterFlutterInstance(
+    flutter::FlutterViewController* flutter_instance) {
+  flutter_instances_.insert(flutter_instance);
+}
+
+void RunLoop::UnregisterFlutterInstance(
+    flutter::FlutterViewController* flutter_instance) {
+  flutter_instances_.erase(flutter_instance);
+}
+
+RunLoop::TimePoint RunLoop::ProcessFlutterMessages() {
+  TimePoint next_event_time = TimePoint::max();
+  for (auto flutter_controller : flutter_instances_) {
+    std::chrono::nanoseconds wait_duration =
+        flutter_controller->ProcessMessages();
+    if (wait_duration != std::chrono::nanoseconds::max()) {
+      next_event_time =
+          std::min(next_event_time, TimePoint::clock::now() + wait_duration);
+    }
+  }
+  return next_event_time;
+}
--- a/example/windows/runner/run_loop.h
+++ b/example/windows/runner/run_loop.h
@@ -0,0 +1,40 @@
+#ifndef RUN_LOOP_H_
+#define RUN_LOOP_H_
+
+#include <flutter/flutter_view_controller.h>
+
+#include <chrono>
+#include <set>
+
+// A runloop that will service events for Flutter instances as well
+// as native messages.
+class RunLoop {
+ public:
+  RunLoop();
+  ~RunLoop();
+
+  // Prevent copying
+  RunLoop(RunLoop const&) = delete;
+  RunLoop& operator=(RunLoop const&) = delete;
+
+  // Runs the run loop until the application quits.
+  void Run();
+
+  // Registers the given Flutter instance for event servicing.
+  void RegisterFlutterInstance(
+      flutter::FlutterViewController* flutter_instance);
+
+  // Unregisters the given Flutter instance from event servicing.
+  void UnregisterFlutterInstance(
+      flutter::FlutterViewController* flutter_instance);
+
+ private:
+  using TimePoint = std::chrono::steady_clock::time_point;
+
+  // Processes all currently pending messages for registered Flutter instances.
+  TimePoint ProcessFlutterMessages();
+
+  std::set<flutter::FlutterViewController*> flutter_instances_;
+};
+
+#endif  // RUN_LOOP_H_
--- a/example/windows/runner/runner.exe.manifest
+++ b/example/windows/runner/runner.exe.manifest
@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+<assembly xmlns="urn:schemas-microsoft-com:asm.v1" manifestVersion="1.0">
+  <application xmlns="urn:schemas-microsoft-com:asm.v3">
+    <windowsSettings>
+      <dpiAwareness xmlns="http://schemas.microsoft.com/SMI/2016/WindowsSettings">PerMonitorV2</dpiAwareness>
+    </windowsSettings>
+  </application>
+  <compatibility xmlns="urn:schemas-microsoft-com:compatibility.v1">
+    <application>
+      <!-- Windows 10 -->
+      <supportedOS Id="{8e0f7a12-bfb3-4fe8-b9a5-48fd50a15a9a}"/>
+      <!-- Windows 8.1 -->
+      <supportedOS Id="{1f676c76-80e1-4239-95bb-83d0f6d0da78}"/>
+      <!-- Windows 8 -->
+      <supportedOS Id="{4a2f28e3-53b9-4441-ba9c-d69d4a4a6e38}"/>
+      <!-- Windows 7 -->
+      <supportedOS Id="{35138b9a-5d96-4fbd-8e2d-a2440225f93a}"/>
+    </application>
+  </compatibility>
+</assembly>
--- a/example/windows/runner/utils.cpp
+++ b/example/windows/runner/utils.cpp
@@ -0,0 +1,22 @@
+#include "utils.h"
+
+#include <flutter_windows.h>
+#include <io.h>
+#include <stdio.h>
+#include <windows.h>
+
+#include <iostream>
+
+void CreateAndAttachConsole() {
+  if (::AllocConsole()) {
+    FILE *unused;
+    if (freopen_s(&unused, "CONOUT$", "w", stdout)) {
+      _dup2(_fileno(stdout), 1);
+    }
+    if (freopen_s(&unused, "CONOUT$", "w", stderr)) {
+      _dup2(_fileno(stdout), 2);
+    }
+    std::ios::sync_with_stdio();
+    FlutterDesktopResyncOutputStreams();
+  }
+}
--- a/example/windows/runner/utils.h
+++ b/example/windows/runner/utils.h
@@ -0,0 +1,8 @@
+#ifndef CONSOLE_UTILS_H_
+#define CONSOLE_UTILS_H_
+
+// Creates a console for the process, and redirects stdout and stderr to
+// it for both the runner and the Flutter library.
+void CreateAndAttachConsole();
+
+#endif  // CONSOLE_UTILS_H_
--- a/example/windows/runner/win32_window.cpp
+++ b/example/windows/runner/win32_window.cpp
@@ -0,0 +1,249 @@
+#include "win32_window.h"
+
+#include <flutter_windows.h>
+
+#include "resource.h"
+
+namespace {
+
+constexpr const wchar_t kWindowClassName[] = L"FLUTTER_RUNNER_WIN32_WINDOW";
+
+// The number of Win32Window objects that currently exist.
+static int g_active_window_count = 0;
+
+using EnableNonClientDpiScaling = BOOL __stdcall(HWND hwnd);
+
+// Scale helper to convert logical scaler values to physical using passed in
+// scale factor
+int Scale(int source, double scale_factor) {
+  return static_cast<int>(source * scale_factor);
+}
+
+// Dynamically loads the |EnableNonClientDpiScaling| from the User32 module.
+// This API is only needed for PerMonitor V1 awareness mode.
+void EnableFullDpiSupportIfAvailable(HWND hwnd) {
+  HMODULE user32_module = LoadLibraryA("User32.dll");
+  if (!user32_module) {
+    return;
+  }
+  auto enable_non_client_dpi_scaling =
+      reinterpret_cast<EnableNonClientDpiScaling*>(
+          GetProcAddress(user32_module, "EnableNonClientDpiScaling"));
+  if (enable_non_client_dpi_scaling != nullptr) {
+    enable_non_client_dpi_scaling(hwnd);
+    FreeLibrary(user32_module);
+  }
+}
+
+}  // namespace
+
+// Manages the Win32Window's window class registration.
+class WindowClassRegistrar {
+ public:
+  ~WindowClassRegistrar() = default;
+
+  // Returns the singleton registar instance.
+  static WindowClassRegistrar* GetInstance() {
+    if (!instance_) {
+      instance_ = new WindowClassRegistrar();
+    }
+    return instance_;
+  }
+
+  // Returns the name of the window class, registering the class if it hasn't
+  // previously been registered.
+  const wchar_t* GetWindowClass();
+
+  // Unregisters the window class. Should only be called if there are no
+  // instances of the window.
+  void UnregisterWindowClass();
+
+ private:
+  WindowClassRegistrar() = default;
+
+  static WindowClassRegistrar* instance_;
+
+  bool class_registered_ = false;
+};
+
+WindowClassRegistrar* WindowClassRegistrar::instance_ = nullptr;
+
+const wchar_t* WindowClassRegistrar::GetWindowClass() {
+  if (!class_registered_) {
+    WNDCLASS window_class{};
+    window_class.hCursor = LoadCursor(nullptr, IDC_ARROW);
+    window_class.lpszClassName = kWindowClassName;
+    window_class.style = CS_HREDRAW | CS_VREDRAW;
+    window_class.cbClsExtra = 0;
+    window_class.cbWndExtra = 0;
+    window_class.hInstance = GetModuleHandle(nullptr);
+    window_class.hIcon =
+        LoadIcon(window_class.hInstance, MAKEINTRESOURCE(IDI_APP_ICON));
+    window_class.hbrBackground = 0;
+    window_class.lpszMenuName = nullptr;
+    window_class.lpfnWndProc = Win32Window::WndProc;
+    RegisterClass(&window_class);
+    class_registered_ = true;
+  }
+  return kWindowClassName;
+}
+
+void WindowClassRegistrar::UnregisterWindowClass() {
+  UnregisterClass(kWindowClassName, nullptr);
+  class_registered_ = false;
+}
+
+Win32Window::Win32Window() {
+  ++g_active_window_count;
+}
+
+Win32Window::~Win32Window() {
+  --g_active_window_count;
+  Destroy();
+}
+
+bool Win32Window::CreateAndShow(const std::wstring& title,
+                                const Point& origin,
+                                const Size& size) {
+  Destroy();
+
+  const wchar_t* window_class =
+      WindowClassRegistrar::GetInstance()->GetWindowClass();
+
+  const POINT target_point = {static_cast<LONG>(origin.x),
+                              static_cast<LONG>(origin.y)};
+  HMONITOR monitor = MonitorFromPoint(target_point, MONITOR_DEFAULTTONEAREST);
+  UINT dpi = FlutterDesktopGetDpiForMonitor(monitor);
+  double scale_factor = dpi / 96.0;
+
+  HWND window = CreateWindow(
+      window_class, title.c_str(), WS_OVERLAPPEDWINDOW | WS_VISIBLE,
+      Scale(origin.x, scale_factor), Scale(origin.y, scale_factor),
+      Scale(size.width, scale_factor), Scale(size.height, scale_factor),
+      nullptr, nullptr, GetModuleHandle(nullptr), this);
+
+  OnCreate();
+
+  return window != nullptr;
+}
+
+// static
+LRESULT CALLBACK Win32Window::WndProc(HWND const window,
+                                      UINT const message,
+                                      WPARAM const wparam,
+                                      LPARAM const lparam) noexcept {
+  if (message == WM_NCCREATE) {
+    auto window_struct = reinterpret_cast<CREATESTRUCT*>(lparam);
+    SetWindowLongPtr(window, GWLP_USERDATA,
+                     reinterpret_cast<LONG_PTR>(window_struct->lpCreateParams));
+
+    auto that = static_cast<Win32Window*>(window_struct->lpCreateParams);
+    EnableFullDpiSupportIfAvailable(window);
+    that->window_handle_ = window;
+  } else if (Win32Window* that = GetThisFromHandle(window)) {
+    return that->MessageHandler(window, message, wparam, lparam);
+  }
+
+  return DefWindowProc(window, message, wparam, lparam);
+}
+
+LRESULT
+Win32Window::MessageHandler(HWND hwnd,
+                            UINT const message,
+                            WPARAM const wparam,
+                            LPARAM const lparam) noexcept {
+  auto window =
+      reinterpret_cast<Win32Window*>(GetWindowLongPtr(hwnd, GWLP_USERDATA));
+
+  if (window == nullptr) {
+    return 0;
+  }
+
+  switch (message) {
+    case WM_DESTROY:
+      window_handle_ = nullptr;
+      Destroy();
+      if (quit_on_close_) {
+        PostQuitMessage(0);
+      }
+      return 0;
+
+    case WM_DPICHANGED: {
+      auto newRectSize = reinterpret_cast<RECT*>(lparam);
+      LONG newWidth = newRectSize->right - newRectSize->left;
+      LONG newHeight = newRectSize->bottom - newRectSize->top;
+
+      SetWindowPos(hwnd, nullptr, newRectSize->left, newRectSize->top, newWidth,
+                   newHeight, SWP_NOZORDER | SWP_NOACTIVATE);
+
+      return 0;
+    }
+    case WM_SIZE:
+      RECT rect;
+      GetClientRect(hwnd, &rect);
+      if (child_content_ != nullptr) {
+        // Size and position the child window.
+        MoveWindow(child_content_, rect.left, rect.top, rect.right - rect.left,
+                   rect.bottom - rect.top, TRUE);
+      }
+      return 0;
+
+    case WM_ACTIVATE:
+      if (child_content_ != nullptr) {
+        SetFocus(child_content_);
+      }
+      return 0;
+
+    // Messages that are directly forwarded to embedding.
+    case WM_FONTCHANGE:
+      SendMessage(child_content_, WM_FONTCHANGE, NULL, NULL);
+      return 0;
+  }
+
+  return DefWindowProc(window_handle_, message, wparam, lparam);
+}
+
+void Win32Window::Destroy() {
+  OnDestroy();
+
+  if (window_handle_) {
+    DestroyWindow(window_handle_);
+    window_handle_ = nullptr;
+  }
+  if (g_active_window_count == 0) {
+    WindowClassRegistrar::GetInstance()->UnregisterWindowClass();
+  }
+}
+
+Win32Window* Win32Window::GetThisFromHandle(HWND const window) noexcept {
+  return reinterpret_cast<Win32Window*>(
+      GetWindowLongPtr(window, GWLP_USERDATA));
+}
+
+void Win32Window::SetChildContent(HWND content) {
+  child_content_ = content;
+  SetParent(content, window_handle_);
+  RECT frame;
+  GetClientRect(window_handle_, &frame);
+
+  MoveWindow(content, frame.left, frame.top, frame.right - frame.left,
+             frame.bottom - frame.top, true);
+
+  SetFocus(child_content_);
+}
+
+HWND Win32Window::GetHandle() {
+  return window_handle_;
+}
+
+void Win32Window::SetQuitOnClose(bool quit_on_close) {
+  quit_on_close_ = quit_on_close;
+}
+
+void Win32Window::OnCreate() {
+  // No-op; provided for subclasses.
+}
+
+void Win32Window::OnDestroy() {
+  // No-op; provided for subclasses.
+}
--- a/example/windows/runner/win32_window.h
+++ b/example/windows/runner/win32_window.h
@@ -0,0 +1,96 @@
+#ifndef WIN32_WINDOW_H_
+#define WIN32_WINDOW_H_
+
+#include <Windows.h>
+#include <Windowsx.h>
+
+#include <functional>
+#include <memory>
+#include <string>
+
+// A class abstraction for a high DPI-aware Win32 Window. Intended to be
+// inherited from by classes that wish to specialize with custom
+// rendering and input handling
+class Win32Window {
+ public:
+  struct Point {
+    unsigned int x;
+    unsigned int y;
+    Point(unsigned int x, unsigned int y) : x(x), y(y) {}
+  };
+
+  struct Size {
+    unsigned int width;
+    unsigned int height;
+    Size(unsigned int width, unsigned int height)
+        : width(width), height(height) {}
+  };
+
+  Win32Window();
+  virtual ~Win32Window();
+
+  // Creates and shows a win32 window with |title| and position and size using
+  // |origin| and |size|. New windows are created on the default monitor. Window
+  // sizes are specified to the OS in physical pixels, hence to ensure a
+  // consistent size to will treat the width height passed in to this function
+  // as logical pixels and scale to appropriate for the default monitor. Returns
+  // true if the window was created successfully.
+  bool CreateAndShow(const std::wstring& title,
+                     const Point& origin,
+                     const Size& size);
+
+  // Release OS resources associated with window.
+  void Destroy();
+
+  // Inserts |content| into the window tree.
+  void SetChildContent(HWND content);
+
+  // Returns the backing Window handle to enable clients to set icon and other
+  // window properties. Returns nullptr if the window has been destroyed.
+  HWND GetHandle();
+
+  // If true, closing this window will quit the application.
+  void SetQuitOnClose(bool quit_on_close);
+
+ protected:
+  // Processes and route salient window messages for mouse handling,
+  // size change and DPI. Delegates handling of these to member overloads that
+  // inheriting classes can handle.
+  virtual LRESULT MessageHandler(HWND window,
+                                 UINT const message,
+                                 WPARAM const wparam,
+                                 LPARAM const lparam) noexcept;
+
+  // Called when CreateAndShow is called, allowing subclass window-related
+  // setup.
+  virtual void OnCreate();
+
+  // Called when Destroy is called.
+  virtual void OnDestroy();
+
+ private:
+  friend class WindowClassRegistrar;
+
+  // OS callback called by message pump. Handles the WM_NCCREATE message which
+  // is passed when the non-client area is being created and enables automatic
+  // non-client DPI scaling so that the non-client area automatically
+  // responsponds to changes in DPI. All other messages are handled by
+  // MessageHandler.
+  static LRESULT CALLBACK WndProc(HWND const window,
+                                  UINT const message,
+                                  WPARAM const wparam,
+                                  LPARAM const lparam) noexcept;
+
+  // Retrieves a class instance pointer for |window|
+  static Win32Window* GetThisFromHandle(HWND const window) noexcept;
+
+  bool quit_on_close_ = false;
+
+  // window handle for top level window.
+  HWND window_handle_ = nullptr;
+
+  // window handle for hosted content.
+  HWND child_content_ = nullptr;
+};
+
+#endif  // WIN32_WINDOW_H_
--- a/example/windows/runner/window_configuration.cpp
+++ b/example/windows/runner/window_configuration.cpp
@@ -0,0 +1,7 @@
+#include "window_configuration.h"
+
+const wchar_t* kFlutterWindowTitle = L"flutter_qjs_example";
+const unsigned int kFlutterWindowOriginX = 10;
+const unsigned int kFlutterWindowOriginY = 10;
+const unsigned int kFlutterWindowWidth = 1280;
+const unsigned int kFlutterWindowHeight = 720;
--- a/example/windows/runner/window_configuration.h
+++ b/example/windows/runner/window_configuration.h
@@ -0,0 +1,18 @@
+#ifndef WINDOW_CONFIGURATION_
+#define WINDOW_CONFIGURATION_
+
+// This is a temporary approach to isolate changes that people are likely to
+// make to main.cpp, where the APIs are still in flux. This will reduce the
+// need to resolve conflicts or re-create changes slightly differently every
+// time the Windows Flutter API surface changes.
+//
+// Longer term there should be simpler configuration options for common
+// customizations like this, without requiring native code changes.
+
+extern const wchar_t* kFlutterWindowTitle;
+extern const unsigned int kFlutterWindowOriginX;
+extern const unsigned int kFlutterWindowOriginY;
+extern const unsigned int kFlutterWindowWidth;
+extern const unsigned int kFlutterWindowHeight;
+
+#endif  // WINDOW_CONFIGURATION_