Extract isolate messages into separate files

packages/sane/lib/src/isolate_messages/cancel.dart

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+import 'package:sane/src/isolate_messages/interface.dart';
+import 'package:sane/src/structures.dart';
+
+class CancelMessage implements IsolateMessage {
+  CancelMessage({required this.handle});
+
+  final SaneHandle handle;
+}
+
+class CancelResponse implements IsolateResponse {}

packages/sane/lib/src/isolate_messages/close.dart

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+import 'package:sane/src/isolate_messages/interface.dart';
+import 'package:sane/src/structures.dart';
+
+class CloseMessage implements IsolateMessage {
+  CloseMessage({required this.handle});
+
+  final SaneHandle handle;
+}
+
+class CloseResponse implements IsolateResponse {}

packages/sane/lib/src/isolate_messages/control_button_option.dart

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+import 'package:sane/src/isolate_messages/interface.dart';
+import 'package:sane/src/structures.dart';
+
+class ControlButtonOptionMessage implements IsolateMessage {
+  ControlButtonOptionMessage({
+    required this.handle,
+    required this.index,
+  });
+
+  final SaneHandle handle;
+  final int index;
+}
+
+class ControlButtonOptionResponse implements IsolateResponse {
+  ControlButtonOptionResponse({required this.result});
+
+  final SaneOptionResult<Null> result;
+}

packages/sane/lib/src/isolate_messages/control_option.dart

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+import 'package:sane/src/isolate_messages/interface.dart';
+import 'package:sane/src/structures.dart';
+
+class ControlOptionMessage<T> implements IsolateMessage {
+  ControlOptionMessage({
+    required this.handle,
+    required this.index,
+    required this.action,
+    this.value,
+  });
+
+  final SaneHandle handle;
+  final int index;
+  final SaneAction action;
+  final T? value;
+}
+
+class ControlOptionResponse<T> implements IsolateResponse {
+  ControlOptionResponse({required this.result});
+
+  final SaneOptionResult<T> result;
+}

packages/sane/lib/src/isolate_messages/exit.dart

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+import 'package:sane/src/isolate_messages/interface.dart';
+
+class ExitMessage implements IsolateMessage {}
+
+class ExitResponse implements IsolateResponse {}

packages/sane/lib/src/isolate_messages/get_all_option_descriptors.dart

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+import 'package:sane/src/isolate_messages/interface.dart';
+import 'package:sane/src/structures.dart';
+
+class GetAllOptionDescriptorsMessage implements IsolateMessage {
+  GetAllOptionDescriptorsMessage({required this.handle});
+
+  final SaneHandle handle;
+}
+
+class GetAllOptionDescriptorsResponse implements IsolateResponse {
+  GetAllOptionDescriptorsResponse({required this.optionDescriptors});
+
+  final List<SaneOptionDescriptor> optionDescriptors;
+}

packages/sane/lib/src/isolate_messages/get_devices.dart

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+import 'package:sane/src/isolate_messages/interface.dart';
+import 'package:sane/src/structures.dart';
+
+class GetDevicesMessage implements IsolateMessage {
+  GetDevicesMessage({required this.localOnly});
+
+  final bool localOnly;
+}
+
+class GetDevicesResponse implements IsolateResponse {
+  GetDevicesResponse({required this.devices});
+
+  final List<SaneDevice> devices;
+}

packages/sane/lib/src/isolate_messages/get_option_descriptor.dart

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+import 'package:sane/src/isolate_messages/interface.dart';
+import 'package:sane/src/structures.dart';
+
+class GetOptionDescriptorMessage implements IsolateMessage {
+  GetOptionDescriptorMessage({
+    required this.handle,
+    required this.index,
+  });
+
+  final SaneHandle handle;
+  final int index;
+}
+
+class GetOptionDescriptorResponse implements IsolateResponse {
+  GetOptionDescriptorResponse({required this.optionDescriptor});
+
+  final SaneOptionDescriptor optionDescriptor;
+}

packages/sane/lib/src/isolate_messages/get_parameters.dart

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+import 'package:sane/src/isolate_messages/interface.dart';
+import 'package:sane/src/structures.dart';
+
+class GetParametersMessage implements IsolateMessage {
+  GetParametersMessage({required this.handle});
+
+  final SaneHandle handle;
+}
+
+class GetParametersResponse implements IsolateResponse {
+  GetParametersResponse({required this.parameters});
+
+  final SaneParameters parameters;
+}

packages/sane/lib/src/isolate_messages/init.dart

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+import 'package:sane/src/isolate_messages/interface.dart';
+
+class InitMessage implements IsolateMessage {}
+
+class InitResponse implements IsolateResponse {
+  InitResponse({required this.versionCode});
+
+  final int versionCode;
+}

packages/sane/lib/src/isolate_messages/interface.dart

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+interface class IsolateMessage {}
+
+interface class IsolateResponse {}

packages/sane/lib/src/isolate_messages/open.dart

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+import 'package:sane/src/isolate_messages/interface.dart';
+import 'package:sane/src/structures.dart';
+
+class OpenMessage implements IsolateMessage {
+  OpenMessage({required this.deviceName});
+
+  final String deviceName;
+}
+
+class OpenResponse implements IsolateResponse {
+  OpenResponse({required this.handle});
+
+  final SaneHandle handle;
+}

packages/sane/lib/src/isolate_messages/read.dart

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+import 'dart:typed_data';
+
+import 'package:sane/src/isolate_messages/interface.dart';
+import 'package:sane/src/structures.dart';
+
+class ReadMessage implements IsolateMessage {
+  ReadMessage({
+    required this.handle,
+    required this.bufferSize,
+  });
+
+  final SaneHandle handle;
+  final int bufferSize;
+}
+
+class ReadResponse implements IsolateResponse {
+  ReadResponse({
+    required this.bytes,
+  });
+
+  final Uint8List bytes;
+}

packages/sane/lib/src/isolate_messages/set_io_mode.dart

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+import 'package:sane/src/isolate_messages/interface.dart';
+import 'package:sane/src/structures.dart';
+
+class SetIOModeMessage implements IsolateMessage {
+  SetIOModeMessage({
+    required this.handle,
+    required this.ioMode,
+  });
+
+  final SaneHandle handle;
+  final SaneIOMode ioMode;
+}
+
+class SetIOModeResponse implements IsolateResponse {}

packages/sane/lib/src/isolate_messages/start.dart

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+import 'package:sane/src/isolate_messages/interface.dart';
+import 'package:sane/src/structures.dart';
+
+class StartMessage implements IsolateMessage {
+  StartMessage({required this.handle});
+
+  final SaneHandle handle;
+}
+
+class StartResponse implements IsolateResponse {}