马良AI写作初始化仓库

AINoval/lib/blocs/theme/theme_bloc.dart

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+import 'package:flutter/material.dart';
+import 'package:flutter_bloc/flutter_bloc.dart';
+import 'package:shared_preferences/shared_preferences.dart';
+import 'theme_event.dart';
+import 'theme_state.dart';
+
+class ThemeBloc extends Bloc<ThemeEvent, ThemeState> {
+  static const String themeKey = 'theme_mode';
+  
+  ThemeBloc() : super(const ThemeState(themeMode: ThemeMode.system)) {
+    on<ThemeInitialize>(_onThemeInitialize);
+    on<ThemeChanged>(_onThemeChanged);
+    on<ThemeToggled>(_onThemeToggled);
+  }
+
+  Future<void> _onThemeInitialize(
+    ThemeInitialize event,
+    Emitter<ThemeState> emit,
+  ) async {
+    emit(state.copyWith(isLoading: true));
+    
+    try {
+      final prefs = await SharedPreferences.getInstance();
+      final themeModeString = prefs.getString(themeKey);
+      
+      ThemeMode themeMode = ThemeMode.system;
+      if (themeModeString != null) {
+        switch (themeModeString) {
+          case 'light':
+            themeMode = ThemeMode.light;
+            break;
+          case 'dark':
+            themeMode = ThemeMode.dark;
+            break;
+          case 'system':
+            themeMode = ThemeMode.system;
+            break;
+        }
+      }
+      
+      emit(state.copyWith(
+        themeMode: themeMode,
+        isLoading: false,
+      ));
+    } catch (e) {
+      emit(state.copyWith(
+        themeMode: ThemeMode.system,
+        isLoading: false,
+      ));
+    }
+  }
+
+  Future<void> _onThemeChanged(
+    ThemeChanged event,
+    Emitter<ThemeState> emit,
+  ) async {
+    emit(state.copyWith(themeMode: event.themeMode));
+    
+    try {
+      final prefs = await SharedPreferences.getInstance();
+      String themeModeString;
+      switch (event.themeMode) {
+        case ThemeMode.light:
+          themeModeString = 'light';
+          break;
+        case ThemeMode.dark:
+          themeModeString = 'dark';
+          break;
+        case ThemeMode.system:
+          themeModeString = 'system';
+          break;
+      }
+      await prefs.setString(themeKey, themeModeString);
+    } catch (e) {
+      // 静默处理存储错误
+    }
+  }
+
+  Future<void> _onThemeToggled(
+    ThemeToggled event,
+    Emitter<ThemeState> emit,
+  ) async {
+    ThemeMode newThemeMode;
+    switch (state.themeMode) {
+      case ThemeMode.light:
+        newThemeMode = ThemeMode.dark;
+        break;
+      case ThemeMode.dark:
+        newThemeMode = ThemeMode.system;
+        break;
+      case ThemeMode.system:
+        newThemeMode = ThemeMode.light;
+        break;
+    }
+    
+    add(ThemeChanged(newThemeMode));
+  }
+}

AINoval/lib/blocs/theme/theme_event.dart

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+import 'package:flutter/material.dart';
+
+abstract class ThemeEvent {}
+
+class ThemeInitialize extends ThemeEvent {}
+
+class ThemeChanged extends ThemeEvent {
+  final ThemeMode themeMode;
+
+  ThemeChanged(this.themeMode);
+}
+
+class ThemeToggled extends ThemeEvent {}

AINoval/lib/blocs/theme/theme_state.dart

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+import 'package:flutter/material.dart';
+
+class ThemeState {
+  final ThemeMode themeMode;
+  final bool isLoading;
+
+  const ThemeState({
+    required this.themeMode,
+    this.isLoading = false,
+  });
+
+  ThemeState copyWith({
+    ThemeMode? themeMode,
+    bool? isLoading,
+  }) {
+    return ThemeState(
+      themeMode: themeMode ?? this.themeMode,
+      isLoading: isLoading ?? this.isLoading,
+    );
+  }
+
+  bool get isDarkMode => themeMode == ThemeMode.dark;
+  bool get isLightMode => themeMode == ThemeMode.light;
+  bool get isSystemMode => themeMode == ThemeMode.system;
+}