shell/platform/windows/fixtures/main.dart - mirrors/engine - Git at Google

 // Copyright 2013 The Flutter Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.

 import 'dart:async';
 import 'dart:io' as io;
 import 'dart:typed_data' show ByteData, Endian, Uint8List;
 import 'dart:ui' as ui;
 import 'dart:convert';

 // Signals a waiting latch in the native test.
 @pragma('vm:external-name', 'Signal')
 external void signal();

 // Signals a waiting latch in the native test, passing a boolean value.
 @pragma('vm:external-name', 'SignalBoolValue')
 external void signalBoolValue(bool value);

 // Signals a waiting latch in the native test, passing a string value.
 @pragma('vm:external-name', 'SignalStringValue')
 external void signalStringValue(String value);

 // Signals a waiting latch in the native test, which returns a value to the fixture.
 @pragma('vm:external-name', 'SignalBoolReturn')
 external bool signalBoolReturn();

 // Notify the native test that the first frame has been scheduled.
 @pragma('vm:external-name', 'NotifyFirstFrameScheduled')
 external void notifyFirstFrameScheduled();

 void main() {}

 @pragma('vm:entry-point')
 void hiPlatformChannels() {
   ui.channelBuffers.setListener('hi',
       (ByteData? data, ui.PlatformMessageResponseCallback callback) async {
     ui.PlatformDispatcher.instance.sendPlatformMessage('hi', data,
         (ByteData? reply) {
       ui.PlatformDispatcher.instance
           .sendPlatformMessage('hi', reply, (ByteData? reply) {});
     });
     callback(data);
   });
 }

 /// Returns a future that completes when
 /// `PlatformDispatcher.instance.onSemanticsEnabledChanged` fires.
 Future<void> get semanticsChanged {
   final Completer<void> semanticsChanged = Completer<void>();
   ui.PlatformDispatcher.instance.onSemanticsEnabledChanged =
       semanticsChanged.complete;
   return semanticsChanged.future;
 }

 @pragma('vm:entry-point')
 void sendAccessibilityAnnouncement() async {
   // Wait until semantics are enabled.
   if (!ui.PlatformDispatcher.instance.semanticsEnabled) {
     await semanticsChanged;
   }

   // Standard message codec magic number identifiers.
   // See: https://github.com/flutter/flutter/blob/ee94fe262b63b0761e8e1f889ae52322fef068d2/packages/flutter/lib/src/services/message_codecs.dart#L262
   const int valueMap = 13, valueString = 7;

   // Corresponds to: {"type": "announce", "data": {"message": "hello"}}
   // See: https://github.com/flutter/flutter/blob/b781da9b5822de1461a769c3b245075359f5464d/packages/flutter/lib/src/semantics/semantics_event.dart#L86
   final Uint8List data = Uint8List.fromList([
     // Map with 2 entries
     valueMap, 2,
     // Map key: "type"
     valueString, 'type'.length, ...'type'.codeUnits,
     // Map value: "announce"
     valueString, 'announce'.length, ...'announce'.codeUnits,
     // Map key: "data"
     valueString, 'data'.length, ...'data'.codeUnits,
     // Map value: map with 1 entry
     valueMap, 1,
     // Map key: "message"
     valueString, 'message'.length, ...'message'.codeUnits,
     // Map value: "hello"
     valueString, 'hello'.length, ...'hello'.codeUnits,
   ]);
   final ByteData byteData = data.buffer.asByteData();

   ui.PlatformDispatcher.instance.sendPlatformMessage(
     'flutter/accessibility',
     byteData,
     (ByteData? _) => signal(),
   );
 }

 @pragma('vm:entry-point')
 void sendAccessibilityTooltipEvent() async {
   // Wait until semantics are enabled.
   if (!ui.PlatformDispatcher.instance.semanticsEnabled) {
     await semanticsChanged;
   }

   // Standard message codec magic number identifiers.
   // See: https://github.com/flutter/flutter/blob/ee94fe262b63b0761e8e1f889ae52322fef068d2/packages/flutter/lib/src/services/message_codecs.dart#L262
   const int valueMap = 13, valueString = 7;

   // Corresponds to: {"type": "tooltip", "data": {"message": "hello"}}
   // See: https://github.com/flutter/flutter/blob/b781da9b5822de1461a769c3b245075359f5464d/packages/flutter/lib/src/semantics/semantics_event.dart#L120
   final Uint8List data = Uint8List.fromList([
     // Map with 2 entries
     valueMap, 2,
     // Map key: "type"
     valueString, 'type'.length, ...'type'.codeUnits,
     // Map value: "tooltip"
     valueString, 'tooltip'.length, ...'tooltip'.codeUnits,
     // Map key: "data"
     valueString, 'data'.length, ...'data'.codeUnits,
     // Map value: map with 1 entry
     valueMap, 1,
     // Map key: "message"
     valueString, 'message'.length, ...'message'.codeUnits,
     // Map value: "hello"
     valueString, 'hello'.length, ...'hello'.codeUnits,
   ]);
   final ByteData byteData = data.buffer.asByteData();

   ui.PlatformDispatcher.instance.sendPlatformMessage(
     'flutter/accessibility',
     byteData,
     (ByteData? _) => signal(),
   );
 }

 @pragma('vm:entry-point')
 void exitTestExit() async {
   final Completer<ByteData?> closed = Completer<ByteData?>();
   ui.channelBuffers.setListener('flutter/platform', (ByteData? data, ui.PlatformMessageResponseCallback callback) async {
     final String jsonString = json.encode(<Map<String, String>>[{'response': 'exit'}]);
     final ByteData responseData = ByteData.sublistView(utf8.encode(jsonString));
     callback(responseData);
     closed.complete(data);
   });
   await closed.future;
 }

 @pragma('vm:entry-point')
 void exitTestCancel() async {
   final Completer<ByteData?> closed = Completer<ByteData?>();
   ui.channelBuffers.setListener('flutter/platform', (ByteData? data, ui.PlatformMessageResponseCallback callback) async {
     final String jsonString = json.encode(<Map<String, String>>[{'response': 'cancel'}]);
     final ByteData responseData = ByteData.sublistView(utf8.encode(jsonString));
     callback(responseData);
     closed.complete(data);
   });
   await closed.future;

   // Because the request was canceled, the below shall execute.
   final Completer<ByteData?> exited = Completer<ByteData?>();
   final String jsonString = json.encode(<String, dynamic>{
     'method': 'System.exitApplication',
     'args': <String, dynamic>{
       'type': 'required', 'exitCode': 0
       }
     });
   ui.PlatformDispatcher.instance.sendPlatformMessage(
     'flutter/platform',
     ByteData.sublistView(utf8.encode(jsonString)),
     (ByteData? reply) {
       exited.complete(reply);
     });
   await exited.future;
 }

 @pragma('vm:entry-point')
 void enableLifecycleTest() async {
   final Completer<ByteData?> finished = Completer<ByteData?>();
   ui.channelBuffers.setListener('flutter/lifecycle', (ByteData? data, ui.PlatformMessageResponseCallback callback) async {
     if (data != null) {
       ui.PlatformDispatcher.instance.sendPlatformMessage(
         'flutter/unittest',
         data,
         (ByteData? reply) {
           finished.complete();
         });
     }
   });
   await finished.future;
 }

 @pragma('vm:entry-point')
 void enableLifecycleToFrom() async {
   ui.channelBuffers.setListener('flutter/lifecycle', (ByteData? data, ui.PlatformMessageResponseCallback callback) async {
     if (data != null) {
       ui.PlatformDispatcher.instance.sendPlatformMessage(
         'flutter/unittest',
         data,
         (ByteData? reply) {});
     }
   });
   final Completer<ByteData?> enabledLifecycle = Completer<ByteData?>();
   ui.PlatformDispatcher.instance.sendPlatformMessage('flutter/platform', ByteData.sublistView(utf8.encode('{"method":"System.initializationComplete"}')), (ByteData? data) {
     enabledLifecycle.complete(data);
   });
 }

 @pragma('vm:entry-point')
 void sendCreatePlatformViewMethod() async {
   // The platform view method channel uses the standard method codec.
   // See https://github.com/flutter/flutter/blob/master/packages/flutter/lib/src/services/message_codecs.dart#L262
   // for the implementation of the encoding and magic number identifiers.
   const int valueString = 7;
   const int valueMap = 13;
   const int valueInt32 = 3;
   const String method = 'create';
   const String typeKey = 'viewType';
   const String typeValue = 'type';
   const String idKey = 'id';
   final List<int> data = <int>[
     // Method name
     valueString, method.length, ...utf8.encode(method),
     // Method arguments: {'type': 'type':, 'id': 0}
     valueMap, 2,
     valueString, typeKey.length, ...utf8.encode(typeKey),
     valueString, typeValue.length, ...utf8.encode(typeValue),
     valueString, idKey.length, ...utf8.encode(idKey),
     valueInt32, 0, 0, 0, 0,
   ];

   final Completer<ByteData?> completed = Completer<ByteData?>();
   final ByteData bytes = ByteData.sublistView(Uint8List.fromList(data));
   ui.PlatformDispatcher.instance.sendPlatformMessage('flutter/platform_views', bytes, (ByteData? response) {
     completed.complete(response);
   });
   await completed.future;
 }

 @pragma('vm:entry-point')
 void sendGetKeyboardState() async {
   // The keyboard method channel uses the standard method codec.
   // See https://github.com/flutter/flutter/blob/master/packages/flutter/lib/src/services/message_codecs.dart#L262
   // for the implementation of the encoding and magic number identifiers.
   const int valueNull = 0;
   const int valueString = 7;
   const int valueMap = 13;

   const String method = 'getKeyboardState';
   final List<int> data = <int>[
     // Method name
     valueString, method.length, ...utf8.encode(method),
     // Method arguments: null
     valueNull, 2,
   ];

   final Completer<void> completer = Completer<void>();
   final ByteData bytes = ByteData.sublistView(Uint8List.fromList(data));
   ui.PlatformDispatcher.instance.sendPlatformMessage('flutter/keyboard', bytes, (ByteData? response) {
     // For magic numbers for decoding a reply envelope, see:
     // https://github.com/flutter/flutter/blob/67271f69f7f88a4edba6d8023099e3bd27a072d2/packages/flutter/lib/src/services/message_codecs.dart#L577-L587
     const int replyEnvelopeSuccess = 0;

     // Ensure the response is a success containing a map of keyboard states.
     if (response == null) {
       signalStringValue('Unexpected null response');
     } else if (response.lengthInBytes < 2) {
       signalStringValue('Unexpected response length of ${response.lengthInBytes} bytes');
     } else if (response.getUint8(0) != replyEnvelopeSuccess) {
       signalStringValue('Unexpected response envelope status: ${response.getUint8(0)}');
     } else if (response.getUint8(1) != valueMap) {
       signalStringValue('Unexpected response value magic number: ${response.getUint8(1)}');
     } else {
       signalStringValue('Success');
     }
     completer.complete();
   });
   await completer.future;
 }

 @pragma('vm:entry-point')
 void customEntrypoint() {}

 @pragma('vm:entry-point')
 void verifyNativeFunction() {
   signal();
 }

 @pragma('vm:entry-point')
 void verifyNativeFunctionWithParameters() {
   signalBoolValue(true);
 }

 @pragma('vm:entry-point')
 void verifyNativeFunctionWithReturn() {
   bool value = signalBoolReturn();
   signalBoolValue(value);
 }

 @pragma('vm:entry-point')
 void readPlatformExecutable() {
   signalStringValue(io.Platform.executable);
 }

 @pragma('vm:entry-point')
 void drawHelloWorld() {
   ui.PlatformDispatcher.instance.onBeginFrame = (Duration duration) {
     final ui.ParagraphBuilder paragraphBuilder =
         ui.ParagraphBuilder(ui.ParagraphStyle())..addText('Hello world');
     final ui.Paragraph paragraph = paragraphBuilder.build();

     paragraph.layout(const ui.ParagraphConstraints(width: 800.0));

     final ui.PictureRecorder recorder = ui.PictureRecorder();
     final ui.Canvas canvas = ui.Canvas(recorder);

     canvas.drawParagraph(paragraph, ui.Offset.zero);

     final ui.Picture picture = recorder.endRecording();
     final ui.SceneBuilder sceneBuilder = ui.SceneBuilder()
       ..addPicture(ui.Offset.zero, picture)
       ..pop();

     ui.PlatformDispatcher.instance.implicitView?.render(sceneBuilder.build());
   };

   ui.PlatformDispatcher.instance.scheduleFrame();
   notifyFirstFrameScheduled();
 }

 ui.Picture _createColoredBox(ui.Color color, ui.Size size) {
   final ui.Paint paint = ui.Paint();
   paint.color = color;
   final ui.PictureRecorder baseRecorder = ui.PictureRecorder();
   final ui.Canvas canvas = ui.Canvas(baseRecorder);
   canvas.drawRect(ui.Rect.fromLTRB(0.0, 0.0, size.width, size.height), paint);
   return baseRecorder.endRecording();
 }

 @pragma('vm:entry-point')
 void renderImplicitView() {
   ui.PlatformDispatcher.instance.onBeginFrame = (Duration duration) {
     final ui.Size size = ui.Size(800.0, 600.0);
     final ui.Color red = ui.Color.fromARGB(127, 255, 0, 0);

     final ui.SceneBuilder builder = ui.SceneBuilder();

     builder.pushOffset(0.0, 0.0);

     builder.addPicture(
         ui.Offset(0.0, 0.0), _createColoredBox(red, size));

     builder.pop();

     ui.PlatformDispatcher.instance.implicitView?.render(builder.build());
   };
   ui.PlatformDispatcher.instance.scheduleFrame();
 }

 @pragma('vm:entry-point')
 void signalViewIds() {
   final Iterable<ui.FlutterView> views = ui.PlatformDispatcher.instance.views;
   final List<int> viewIds =
       views.map((ui.FlutterView view) => view.viewId).toList();

   viewIds.sort();

   signalStringValue('View IDs: [${viewIds.join(', ')}]');
 }

 @pragma('vm:entry-point')
 void onMetricsChangedSignalViewIds() {
   ui.PlatformDispatcher.instance.onMetricsChanged = () {
     signalViewIds();
   };

   signal();
 }
	// Copyright 2013 The Flutter Authors. All rights reserved.
	// Use of this source code is governed by a BSD-style license that can be
	// found in the LICENSE file.

	import 'dart:async';
	import 'dart:io' as io;
	import 'dart:typed_data' show ByteData, Endian, Uint8List;
	import 'dart:ui' as ui;
	import 'dart:convert';

	// Signals a waiting latch in the native test.
	@pragma('vm:external-name', 'Signal')
	external void signal();

	// Signals a waiting latch in the native test, passing a boolean value.
	@pragma('vm:external-name', 'SignalBoolValue')
	external void signalBoolValue(bool value);

	// Signals a waiting latch in the native test, passing a string value.
	@pragma('vm:external-name', 'SignalStringValue')
	external void signalStringValue(String value);

	// Signals a waiting latch in the native test, which returns a value to the fixture.
	@pragma('vm:external-name', 'SignalBoolReturn')
	external bool signalBoolReturn();

	// Notify the native test that the first frame has been scheduled.
	@pragma('vm:external-name', 'NotifyFirstFrameScheduled')
	external void notifyFirstFrameScheduled();

	void main() {}

	@pragma('vm:entry-point')
	void hiPlatformChannels() {
	ui.channelBuffers.setListener('hi',
	(ByteData? data, ui.PlatformMessageResponseCallback callback) async {
	ui.PlatformDispatcher.instance.sendPlatformMessage('hi', data,
	(ByteData? reply) {
	ui.PlatformDispatcher.instance
	.sendPlatformMessage('hi', reply, (ByteData? reply) {});
	});
	callback(data);
	});
	}

	/// Returns a future that completes when
	/// `PlatformDispatcher.instance.onSemanticsEnabledChanged` fires.
	Future<void> get semanticsChanged {
	final Completer<void> semanticsChanged = Completer<void>();
	ui.PlatformDispatcher.instance.onSemanticsEnabledChanged =
	semanticsChanged.complete;
	return semanticsChanged.future;
	}

	@pragma('vm:entry-point')
	void sendAccessibilityAnnouncement() async {
	// Wait until semantics are enabled.
	if (!ui.PlatformDispatcher.instance.semanticsEnabled) {
	await semanticsChanged;
	}

	// Standard message codec magic number identifiers.
	// See: https://github.com/flutter/flutter/blob/ee94fe262b63b0761e8e1f889ae52322fef068d2/packages/flutter/lib/src/services/message_codecs.dart#L262
	const int valueMap = 13, valueString = 7;

	// Corresponds to: {"type": "announce", "data": {"message": "hello"}}
	// See: https://github.com/flutter/flutter/blob/b781da9b5822de1461a769c3b245075359f5464d/packages/flutter/lib/src/semantics/semantics_event.dart#L86
	final Uint8List data = Uint8List.fromList([
	// Map with 2 entries
	valueMap, 2,
	// Map key: "type"
	valueString, 'type'.length, ...'type'.codeUnits,
	// Map value: "announce"
	valueString, 'announce'.length, ...'announce'.codeUnits,
	// Map key: "data"
	valueString, 'data'.length, ...'data'.codeUnits,
	// Map value: map with 1 entry
	valueMap, 1,
	// Map key: "message"
	valueString, 'message'.length, ...'message'.codeUnits,
	// Map value: "hello"
	valueString, 'hello'.length, ...'hello'.codeUnits,
	]);
	final ByteData byteData = data.buffer.asByteData();

	ui.PlatformDispatcher.instance.sendPlatformMessage(
	'flutter/accessibility',
	byteData,
	(ByteData? _) => signal(),
	);
	}

	@pragma('vm:entry-point')
	void sendAccessibilityTooltipEvent() async {
	// Wait until semantics are enabled.
	if (!ui.PlatformDispatcher.instance.semanticsEnabled) {
	await semanticsChanged;
	}

	// Standard message codec magic number identifiers.
	// See: https://github.com/flutter/flutter/blob/ee94fe262b63b0761e8e1f889ae52322fef068d2/packages/flutter/lib/src/services/message_codecs.dart#L262
	const int valueMap = 13, valueString = 7;

	// Corresponds to: {"type": "tooltip", "data": {"message": "hello"}}
	// See: https://github.com/flutter/flutter/blob/b781da9b5822de1461a769c3b245075359f5464d/packages/flutter/lib/src/semantics/semantics_event.dart#L120
	final Uint8List data = Uint8List.fromList([
	// Map with 2 entries
	valueMap, 2,
	// Map key: "type"
	valueString, 'type'.length, ...'type'.codeUnits,
	// Map value: "tooltip"
	valueString, 'tooltip'.length, ...'tooltip'.codeUnits,
	// Map key: "data"
	valueString, 'data'.length, ...'data'.codeUnits,
	// Map value: map with 1 entry
	valueMap, 1,
	// Map key: "message"
	valueString, 'message'.length, ...'message'.codeUnits,
	// Map value: "hello"
	valueString, 'hello'.length, ...'hello'.codeUnits,
	]);
	final ByteData byteData = data.buffer.asByteData();

	ui.PlatformDispatcher.instance.sendPlatformMessage(
	'flutter/accessibility',
	byteData,
	(ByteData? _) => signal(),
	);
	}

	@pragma('vm:entry-point')
	void exitTestExit() async {
	final Completer<ByteData?> closed = Completer<ByteData?>();
	ui.channelBuffers.setListener('flutter/platform', (ByteData? data, ui.PlatformMessageResponseCallback callback) async {
	final String jsonString = json.encode(<Map<String, String>>[{'response': 'exit'}]);
	final ByteData responseData = ByteData.sublistView(utf8.encode(jsonString));
	callback(responseData);
	closed.complete(data);
	});
	await closed.future;
	}

	@pragma('vm:entry-point')
	void exitTestCancel() async {
	final Completer<ByteData?> closed = Completer<ByteData?>();
	ui.channelBuffers.setListener('flutter/platform', (ByteData? data, ui.PlatformMessageResponseCallback callback) async {
	final String jsonString = json.encode(<Map<String, String>>[{'response': 'cancel'}]);
	final ByteData responseData = ByteData.sublistView(utf8.encode(jsonString));
	callback(responseData);
	closed.complete(data);
	});
	await closed.future;

	// Because the request was canceled, the below shall execute.
	final Completer<ByteData?> exited = Completer<ByteData?>();
	final String jsonString = json.encode(<String, dynamic>{
	'method': 'System.exitApplication',
	'args': <String, dynamic>{
	'type': 'required', 'exitCode': 0
	}
	});
	ui.PlatformDispatcher.instance.sendPlatformMessage(
	'flutter/platform',
	ByteData.sublistView(utf8.encode(jsonString)),
	(ByteData? reply) {
	exited.complete(reply);
	});
	await exited.future;
	}

	@pragma('vm:entry-point')
	void enableLifecycleTest() async {
	final Completer<ByteData?> finished = Completer<ByteData?>();
	ui.channelBuffers.setListener('flutter/lifecycle', (ByteData? data, ui.PlatformMessageResponseCallback callback) async {
	if (data != null) {
	ui.PlatformDispatcher.instance.sendPlatformMessage(
	'flutter/unittest',
	data,
	(ByteData? reply) {
	finished.complete();
	});
	}
	});
	await finished.future;
	}

	@pragma('vm:entry-point')
	void enableLifecycleToFrom() async {
	ui.channelBuffers.setListener('flutter/lifecycle', (ByteData? data, ui.PlatformMessageResponseCallback callback) async {
	if (data != null) {
	ui.PlatformDispatcher.instance.sendPlatformMessage(
	'flutter/unittest',
	data,
	(ByteData? reply) {});
	}
	});
	final Completer<ByteData?> enabledLifecycle = Completer<ByteData?>();
	ui.PlatformDispatcher.instance.sendPlatformMessage('flutter/platform', ByteData.sublistView(utf8.encode('{"method":"System.initializationComplete"}')), (ByteData? data) {
	enabledLifecycle.complete(data);
	});
	}

	@pragma('vm:entry-point')
	void sendCreatePlatformViewMethod() async {
	// The platform view method channel uses the standard method codec.
	// See https://github.com/flutter/flutter/blob/master/packages/flutter/lib/src/services/message_codecs.dart#L262
	// for the implementation of the encoding and magic number identifiers.
	const int valueString = 7;
	const int valueMap = 13;
	const int valueInt32 = 3;
	const String method = 'create';
	const String typeKey = 'viewType';
	const String typeValue = 'type';
	const String idKey = 'id';
	final List<int> data = <int>[
	// Method name
	valueString, method.length, ...utf8.encode(method),
	// Method arguments: {'type': 'type':, 'id': 0}
	valueMap, 2,
	valueString, typeKey.length, ...utf8.encode(typeKey),
	valueString, typeValue.length, ...utf8.encode(typeValue),
	valueString, idKey.length, ...utf8.encode(idKey),
	valueInt32, 0, 0, 0, 0,
	];

	final Completer<ByteData?> completed = Completer<ByteData?>();
	final ByteData bytes = ByteData.sublistView(Uint8List.fromList(data));
	ui.PlatformDispatcher.instance.sendPlatformMessage('flutter/platform_views', bytes, (ByteData? response) {
	completed.complete(response);
	});
	await completed.future;
	}

	@pragma('vm:entry-point')
	void sendGetKeyboardState() async {
	// The keyboard method channel uses the standard method codec.
	// See https://github.com/flutter/flutter/blob/master/packages/flutter/lib/src/services/message_codecs.dart#L262
	// for the implementation of the encoding and magic number identifiers.
	const int valueNull = 0;
	const int valueString = 7;
	const int valueMap = 13;

	const String method = 'getKeyboardState';
	final List<int> data = <int>[
	// Method name
	valueString, method.length, ...utf8.encode(method),
	// Method arguments: null
	valueNull, 2,
	];

	final Completer<void> completer = Completer<void>();
	final ByteData bytes = ByteData.sublistView(Uint8List.fromList(data));
	ui.PlatformDispatcher.instance.sendPlatformMessage('flutter/keyboard', bytes, (ByteData? response) {
	// For magic numbers for decoding a reply envelope, see:
	// https://github.com/flutter/flutter/blob/67271f69f7f88a4edba6d8023099e3bd27a072d2/packages/flutter/lib/src/services/message_codecs.dart#L577-L587
	const int replyEnvelopeSuccess = 0;

	// Ensure the response is a success containing a map of keyboard states.
	if (response == null) {
	signalStringValue('Unexpected null response');
	} else if (response.lengthInBytes < 2) {
	signalStringValue('Unexpected response length of ${response.lengthInBytes} bytes');
	} else if (response.getUint8(0) != replyEnvelopeSuccess) {
	signalStringValue('Unexpected response envelope status: ${response.getUint8(0)}');
	} else if (response.getUint8(1) != valueMap) {
	signalStringValue('Unexpected response value magic number: ${response.getUint8(1)}');
	} else {
	signalStringValue('Success');
	}
	completer.complete();
	});
	await completer.future;
	}

	@pragma('vm:entry-point')
	void customEntrypoint() {}

	@pragma('vm:entry-point')
	void verifyNativeFunction() {
	signal();
	}

	@pragma('vm:entry-point')
	void verifyNativeFunctionWithParameters() {
	signalBoolValue(true);
	}

	@pragma('vm:entry-point')
	void verifyNativeFunctionWithReturn() {
	bool value = signalBoolReturn();
	signalBoolValue(value);
	}

	@pragma('vm:entry-point')
	void readPlatformExecutable() {
	signalStringValue(io.Platform.executable);
	}

	@pragma('vm:entry-point')
	void drawHelloWorld() {
	ui.PlatformDispatcher.instance.onBeginFrame = (Duration duration) {
	final ui.ParagraphBuilder paragraphBuilder =
	ui.ParagraphBuilder(ui.ParagraphStyle())..addText('Hello world');
	final ui.Paragraph paragraph = paragraphBuilder.build();

	paragraph.layout(const ui.ParagraphConstraints(width: 800.0));

	final ui.PictureRecorder recorder = ui.PictureRecorder();
	final ui.Canvas canvas = ui.Canvas(recorder);

	canvas.drawParagraph(paragraph, ui.Offset.zero);

	final ui.Picture picture = recorder.endRecording();
	final ui.SceneBuilder sceneBuilder = ui.SceneBuilder()
	..addPicture(ui.Offset.zero, picture)
	..pop();

	ui.PlatformDispatcher.instance.implicitView?.render(sceneBuilder.build());
	};

	ui.PlatformDispatcher.instance.scheduleFrame();
	notifyFirstFrameScheduled();
	}

	ui.Picture _createColoredBox(ui.Color color, ui.Size size) {
	final ui.Paint paint = ui.Paint();
	paint.color = color;
	final ui.PictureRecorder baseRecorder = ui.PictureRecorder();
	final ui.Canvas canvas = ui.Canvas(baseRecorder);
	canvas.drawRect(ui.Rect.fromLTRB(0.0, 0.0, size.width, size.height), paint);
	return baseRecorder.endRecording();
	}

	@pragma('vm:entry-point')
	void renderImplicitView() {
	ui.PlatformDispatcher.instance.onBeginFrame = (Duration duration) {
	final ui.Size size = ui.Size(800.0, 600.0);
	final ui.Color red = ui.Color.fromARGB(127, 255, 0, 0);

	final ui.SceneBuilder builder = ui.SceneBuilder();

	builder.pushOffset(0.0, 0.0);

	builder.addPicture(
	ui.Offset(0.0, 0.0), _createColoredBox(red, size));

	builder.pop();

	ui.PlatformDispatcher.instance.implicitView?.render(builder.build());
	};
	ui.PlatformDispatcher.instance.scheduleFrame();
	}

	@pragma('vm:entry-point')
	void signalViewIds() {
	final Iterable<ui.FlutterView> views = ui.PlatformDispatcher.instance.views;
	final List<int> viewIds =
	views.map((ui.FlutterView view) => view.viewId).toList();

	viewIds.sort();

	signalStringValue('View IDs: [${viewIds.join(', ')}]');
	}

	@pragma('vm:entry-point')
	void onMetricsChangedSignalViewIds() {
	ui.PlatformDispatcher.instance.onMetricsChanged = () {
	signalViewIds();
	};

	signal();
	}