lib/main/adapter/presentation/installation_bloc.dart

@@ -3,6 +3,7 @@ import 'dart:io';
 import 'package:flutter_bloc/flutter_bloc.dart';
 import 'package:minecraft_server_installer/main/adapter/presentation/installation_state.dart';
 import 'package:minecraft_server_installer/main/adapter/presentation/progress_view_model.dart';
+import 'package:minecraft_server_installer/main/adapter/presentation/range_view_model.dart';
 import 'package:minecraft_server_installer/main/application/use_case/download_file_use_case.dart';
 import 'package:minecraft_server_installer/main/application/use_case/grant_file_permission_use_case.dart';
 import 'package:minecraft_server_installer/main/application/use_case/write_file_use_case.dart';
@@ -33,9 +34,8 @@ class InstallationBloc extends Bloc<InstallationEvent, InstallationState> {
       );
 
       final startScriptFilePath = path.join(savePath, Constants.startScriptFileName);
-      final startScriptContent = Platform.isWindows
+      final startScriptContent =
-          ? 'java -jar .\\${Constants.serverFileName}\r\n'
+          'java -Xmx${state.ramSize.max}M -Xms${state.ramSize.min}M -jar ${Platform.isWindows ? '.${Constants.serverFileName}\r\n' : './${Constants.serverFileName}\n'}';
-          : 'java -jar ./${Constants.serverFileName}\n';
       await writeFileUseCase(startScriptFilePath, startScriptContent);
       await grantFilePermissionUseCase(startScriptFilePath);
 
@@ -59,10 +59,16 @@ class InstallationBloc extends Bloc<InstallationEvent, InstallationState> {
     });
 
     on<InstallationConfigurationUpdatedEvent>((event, emit) {
+      if (event.customRamSize != null && !event.customRamSize!.isValid) {
+        return;
+      }
+
       final newState = state.copyWith(
         gameVersion: event.gameVersion,
         savePath: event.savePath,
         isEulaAgreed: event.isEulaAgreed,
+        isCustomRamSizeEnabled: event.isCustomRamSizeEnabled,
+        customRamSize: event.customRamSize,
       );
       emit(newState);
     });
@@ -83,10 +89,14 @@ class InstallationConfigurationUpdatedEvent extends InstallationEvent {
   final GameVersionViewModel? gameVersion;
   final String? savePath;
   final bool? isEulaAgreed;
+  final bool? isCustomRamSizeEnabled;
+  final RangeViewModel? customRamSize;
 
   InstallationConfigurationUpdatedEvent({
     this.gameVersion,
     this.savePath,
     this.isEulaAgreed,
+    this.isCustomRamSizeEnabled,
+    this.customRamSize,
   });
 }

lib/main/adapter/presentation/installation_state.dart

@@ -1,11 +1,16 @@
 import 'package:equatable/equatable.dart';
 import 'package:minecraft_server_installer/main/adapter/presentation/progress_view_model.dart';
+import 'package:minecraft_server_installer/main/adapter/presentation/range_view_model.dart';
 import 'package:minecraft_server_installer/vanilla/adapter/presentation/game_version_view_model.dart';
 
 class InstallationState with EquatableMixin {
+  static const _defaultRamSize = RangeViewModel(min: 2048, max: 2048);
+
   final GameVersionViewModel? gameVersion;
   final String? savePath;
   final bool isEulaAgreed;
+  final bool isCustomRamSizeEnabled;
+  final RangeViewModel? _customRamSize;
   final ProgressViewModel downloadProgress;
   final bool isLocked;
 
@@ -13,15 +18,19 @@ class InstallationState with EquatableMixin {
     required this.gameVersion,
     required this.savePath,
     required this.isEulaAgreed,
+    required this.isCustomRamSizeEnabled,
+    required RangeViewModel? customRamSize,
     required this.downloadProgress,
     required this.isLocked,
-  });
+  }) : _customRamSize = customRamSize;
 
   const InstallationState.empty()
       : this(
           gameVersion: null,
           savePath: null,
           isEulaAgreed: false,
+          isCustomRamSizeEnabled: false,
+          customRamSize: _defaultRamSize,
           downloadProgress: const ProgressViewModel.zero(),
           isLocked: false,
         );
@@ -31,6 +40,8 @@ class InstallationState with EquatableMixin {
         gameVersion,
         savePath,
         isEulaAgreed,
+        isCustomRamSizeEnabled,
+        _customRamSize,
         downloadProgress,
         isLocked,
       ];
@@ -39,6 +50,8 @@ class InstallationState with EquatableMixin {
     GameVersionViewModel? gameVersion,
     String? savePath,
     bool? isEulaAgreed,
+    bool? isCustomRamSizeEnabled,
+    RangeViewModel? customRamSize,
     ProgressViewModel? downloadProgress,
     bool? isLocked,
   }) =>
@@ -46,10 +59,14 @@ class InstallationState with EquatableMixin {
         gameVersion: gameVersion ?? this.gameVersion,
         savePath: savePath ?? this.savePath,
         isEulaAgreed: isEulaAgreed ?? this.isEulaAgreed,
+        isCustomRamSizeEnabled: isCustomRamSizeEnabled ?? this.isCustomRamSizeEnabled,
+        customRamSize: customRamSize ?? _customRamSize,
         downloadProgress: downloadProgress ?? this.downloadProgress,
         isLocked: isLocked ?? this.isLocked,
       );
 
+  RangeViewModel get ramSize => isCustomRamSizeEnabled ? _customRamSize ?? _defaultRamSize : _defaultRamSize;
+
   bool get isGameVersionSelected => gameVersion != null;
 
   bool get isSavePathSelected => savePath != null && savePath!.isNotEmpty;

lib/main/adapter/presentation/range_view_model.dart

@@ -0,0 +1,19 @@
+import 'package:equatable/equatable.dart';
+
+class RangeViewModel with EquatableMixin {
+  final int min;
+  final int max;
+
+  const RangeViewModel({
+    required this.min,
+    required this.max,
+  });
+
+  @override
+  List<Object?> get props => [
+        min,
+        max,
+      ];
+
+  bool get isValid => min <= max;
+}

lib/main/framework/ui/basic_configuration_tab.dart

@@ -1,10 +1,11 @@
+import 'package:file_picker/file_picker.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_bloc/flutter_bloc.dart';
 import 'package:gap/gap.dart';
 import 'package:minecraft_server_installer/main/adapter/presentation/installation_bloc.dart';
 import 'package:minecraft_server_installer/main/adapter/presentation/installation_state.dart';
+import 'package:minecraft_server_installer/main/adapter/presentation/range_view_model.dart';
 import 'package:minecraft_server_installer/main/constants.dart';
-import 'package:minecraft_server_installer/main/framework/ui/path_browsing_field.dart';
 import 'package:minecraft_server_installer/main/framework/ui/strings.dart';
 import 'package:minecraft_server_installer/vanilla/framework/ui/game_version_dropdown.dart';
 import 'package:url_launcher/url_launcher.dart';
@@ -17,14 +18,46 @@ class BasicConfigurationTab extends StatelessWidget {
         children: [
           const GameVersionDropdown(),
           const Gap(16),
-          const PathBrowsingField(),
+          _pathBrowsingField,
           const Gap(16),
           _eulaCheckbox,
+          _enableCustomRamSizeCheckbox,
+          _customRamSizeControl,
           const Spacer(),
           _bottomControl,
         ],
       );
 
+  Widget get _pathBrowsingField => BlocConsumer<InstallationBloc, InstallationState>(
+        listener: (_, __) {},
+        builder: (context, state) => Row(
+          children: [
+            Expanded(
+              child: TextField(
+                controller: TextEditingController(text: state.savePath ?? ''),
+                readOnly: true,
+                canRequestFocus: false,
+                decoration: InputDecoration(
+                  border: OutlineInputBorder(borderRadius: BorderRadius.circular(4)),
+                  label: const Text('${Strings.fieldPath} *'),
+                ),
+              ),
+            ),
+            const Gap(8),
+            SizedBox(
+              height: 48,
+              child: OutlinedButton(
+                onPressed: () => _browseDirectory(context, initialPath: state.savePath),
+                style: OutlinedButton.styleFrom(
+                  shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(4)),
+                ),
+                child: const Text(Strings.buttonBrowse),
+              ),
+            ),
+          ],
+        ),
+      );
+
   Widget get _eulaCheckbox => Row(
         children: [
           Expanded(
@@ -49,6 +82,76 @@ class BasicConfigurationTab extends StatelessWidget {
         ],
       );
 
+  Widget get _enableCustomRamSizeCheckbox => BlocConsumer<InstallationBloc, InstallationState>(
+        listener: (_, __) {},
+        builder: (context, state) => CheckboxListTile(
+          title: const Text(Strings.fieldCustomRamSize),
+          value: state.isCustomRamSizeEnabled,
+          onChanged: (value) => context
+              .read<InstallationBloc>()
+              .add(InstallationConfigurationUpdatedEvent(isCustomRamSizeEnabled: value ?? false)),
+          controlAffinity: ListTileControlAffinity.leading,
+          contentPadding: EdgeInsets.zero,
+          shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(4)),
+        ),
+      );
+
+  Widget get _customRamSizeControl => BlocConsumer<InstallationBloc, InstallationState>(
+        listener: (_, __) {},
+        builder: (context, state) {
+          if (!state.isCustomRamSizeEnabled) {
+            return const SizedBox.shrink();
+          }
+
+          return Column(
+            children: [
+              RangeSlider(
+                values: RangeValues(state.ramSize.min.toDouble(), state.ramSize.max.toDouble()),
+                min: 512,
+                max: 16384,
+                divisions: (16384 - 512) ~/ 128,
+                labels: RangeLabels(
+                  '${state.ramSize.min} MB',
+                  '${state.ramSize.max} MB',
+                ),
+                onChanged: (values) => context.read<InstallationBloc>().add(
+                      InstallationConfigurationUpdatedEvent(
+                        customRamSize: RangeViewModel(min: values.start.toInt(), max: values.end.toInt()),
+                      ),
+                    ),
+              ),
+              Row(
+                children: [
+                  Expanded(
+                    child: TextField(
+                      controller: TextEditingController(text: state.ramSize.min.toString()),
+                      canRequestFocus: false,
+                      readOnly: true,
+                      decoration: InputDecoration(
+                        label: const Text('${Strings.labelMinRamSize} (MB)'),
+                        border: OutlineInputBorder(borderRadius: BorderRadius.circular(4)),
+                      ),
+                    ),
+                  ),
+                  const Gap(16),
+                  Expanded(
+                    child: TextField(
+                      controller: TextEditingController(text: state.ramSize.max.toString()),
+                      canRequestFocus: false,
+                      readOnly: true,
+                      decoration: InputDecoration(
+                        label: const Text('${Strings.labelMaxRamSize} (MB)'),
+                        border: OutlineInputBorder(borderRadius: BorderRadius.circular(4)),
+                      ),
+                    ),
+                  ),
+                ],
+              )
+            ],
+          );
+        },
+      );
+
   Widget get _bottomControl => BlocConsumer<InstallationBloc, InstallationState>(
         listener: (_, __) {},
         builder: (context, state) => Row(
@@ -71,6 +174,22 @@ class BasicConfigurationTab extends StatelessWidget {
         ),
       );
 
+  Future<void> _browseDirectory(BuildContext context, {String? initialPath}) async {
+    final hasInitialPath = initialPath?.isNotEmpty ?? false;
+    final directory = await FilePicker.platform.getDirectoryPath(
+      dialogTitle: Strings.dialogTitleSelectDirectory,
+      initialDirectory: hasInitialPath ? initialPath : null,
+    );
+
+    if (!context.mounted || directory == null) {
+      return;
+    }
+
+    context.read<InstallationBloc>().add(InstallationConfigurationUpdatedEvent(
+          savePath: directory,
+        ));
+  }
+
   void _downloadServerFile(BuildContext context) {
     context.read<InstallationBloc>().add((InstallationStartedEvent()));
   }

lib/main/framework/ui/path_browsing_field.dart

@@ -1,75 +0,0 @@
-import 'package:file_picker/file_picker.dart';
-import 'package:flutter/material.dart';
-import 'package:flutter_bloc/flutter_bloc.dart';
-import 'package:gap/gap.dart';
-import 'package:minecraft_server_installer/main/adapter/presentation/installation_bloc.dart';
-import 'package:minecraft_server_installer/main/adapter/presentation/installation_state.dart';
-import 'package:minecraft_server_installer/main/framework/ui/strings.dart';
-
-class PathBrowsingField extends StatefulWidget {
-  const PathBrowsingField({super.key});
-
-  @override
-  State<PathBrowsingField> createState() => _PathBrowsingFieldState();
-}
-
-class _PathBrowsingFieldState extends State<PathBrowsingField> {
-  final _textEditingController = TextEditingController();
-
-  @override
-  void initState() {
-    super.initState();
-
-    _textEditingController.text = context.read<InstallationBloc>().state.savePath ?? '';
-  }
-
-  @override
-  Widget build(BuildContext context) => BlocConsumer<InstallationBloc, InstallationState>(
-        listener: (_, state) {
-          if (state.savePath != null) {
-            _textEditingController.text = state.savePath!;
-          }
-        },
-        builder: (_, __) => Row(
-          children: [
-            Expanded(
-              child: TextField(
-                controller: _textEditingController,
-                readOnly: true,
-                canRequestFocus: false,
-                decoration: InputDecoration(
-                  border: OutlineInputBorder(borderRadius: BorderRadius.circular(4)),
-                  label: const Text('${Strings.fieldPath} *'),
-                ),
-              ),
-            ),
-            const Gap(8),
-            SizedBox(
-              height: 48,
-              child: OutlinedButton(
-                onPressed: _browseDirectory,
-                style: OutlinedButton.styleFrom(
-                  shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(4)),
-                ),
-                child: const Text(Strings.buttonBrowse),
-              ),
-            ),
-          ],
-        ),
-      );
-
-  Future<void> _browseDirectory() async {
-    final directory = await FilePicker.platform.getDirectoryPath(
-      dialogTitle: Strings.dialogTitleSelectDirectory,
-      initialDirectory: _textEditingController.text.isNotEmpty ? _textEditingController.text : null,
-    );
-
-    if (!mounted || directory == null) {
-      return;
-    }
-
-    context.read<InstallationBloc>().add(InstallationConfigurationUpdatedEvent(
-          savePath: directory,
-        ));
-  }
-}

lib/main/framework/ui/strings.dart

@@ -2,8 +2,11 @@ abstract class Strings {
   static const fieldGameVersion = '遊戲版本';
   static const fieldPath = '安裝路徑';
   static const fieldEula = '我同意 EULA 條款';
+  static const fieldCustomRamSize = '啟用自定義 RAM 大小';
   static const buttonStartToInstall = '開始安裝';
   static const buttonBrowse = '瀏覽';
+  static const labelMinRamSize = '最小 RAM 大小';
+  static const labelMaxRamSize = '最大 RAM 大小';
   static const tooltipEulaInfo = '點擊查看 EULA 條款';
   static const dialogTitleSelectDirectory = '選擇安裝目錄';
 }