feat:增加主题颜色和暗黑模式

lib/provider/app_provider.dart

@@ -1,12 +1,188 @@
 import 'package:flutter/material.dart';
 
-class AppProvider with ChangeNotifier {
-  int _currentIndex = 0;
+class ThemeColor {
+  final String name;
+  final Color primaryColor;
+  final MaterialColor materialColor;
 
-  int get currentIndex => _currentIndex;
+  ThemeColor({
+    required this.name,
+    required this.primaryColor,
+    required this.materialColor,
+  });
+}
+
+class AppProvider with ChangeNotifier {
+  int _currentTab = 0;
+  bool _isDarkMode = false;
+  ThemeColor _currentTheme = _defaultThemes[0];
+
+  // 预定义主题色
+  static final List<ThemeColor> _defaultThemes = [
+    ThemeColor(
+      name: '科技蓝',
+      primaryColor: Color(0xFF2563EB),
+      materialColor: MaterialColor(0xFF2563EB, {
+        50: Color(0xFFDBEAFE),
+        100: Color(0xFFBFDBFE),
+        200: Color(0xFF93C5FD),
+        300: Color(0xFF60A5FA),
+        400: Color(0xFF3B82F6),
+        500: Color(0xFF2563EB),
+        600: Color(0xFF1D4ED8),
+        700: Color(0xFF1E40AF),
+        800: Color(0xFF1E3A8A),
+        900: Color(0xFF1E3A8A),
+      }),
+    ),
+    ThemeColor(
+      name: '翡翠绿',
+      primaryColor: Color(0xFF10B981),
+      materialColor: MaterialColor(0xFF10B981, {
+        50: Color(0xFFECFDF5),
+        100: Color(0xFFD1FAE5),
+        200: Color(0xFFA7F3D0),
+        300: Color(0xFF6EE7B7),
+        400: Color(0xFF34D399),
+        500: Color(0xFF10B981),
+        600: Color(0xFF059669),
+        700: Color(0xFF047857),
+        800: Color(0xFF065F46),
+        900: Color(0xFF064E3B),
+      }),
+    ),
+    ThemeColor(
+      name: '活力橙',
+      primaryColor: Color(0xFFF59E0B),
+      materialColor: MaterialColor(0xFFF59E0B, {
+        50: Color(0xFFFFFBEB),
+        100: Color(0xFFFEF3C7),
+        200: Color(0xFFFDE68A),
+        300: Color(0xFFFCD34D),
+        400: Color(0xFFFBBF24),
+        500: Color(0xFFF59E0B),
+        600: Color(0xFFD97706),
+        700: Color(0xFFB45309),
+        800: Color(0xFF92400E),
+        900: Color(0xFF78350F),
+      }),
+    ),
+    ThemeColor(
+      name: '梦幻紫',
+      primaryColor: Color(0xFF8B5CF6),
+      materialColor: MaterialColor(0xFF8B5CF6, {
+        50: Color(0xFFF5F3FF),
+        100: Color(0xFFEDE9FE),
+        200: Color(0xFFDDD6FE),
+        300: Color(0xFFC4B5FD),
+        400: Color(0xFFA78BFA),
+        500: Color(0xFF8B5CF6),
+        600: Color(0xFF7C3AED),
+        700: Color(0xFF6D28D9),
+        800: Color(0xFF5B21B6),
+        900: Color(0xFF4C1D95),
+      }),
+    ),
+    ThemeColor(
+      name: '浪漫粉',
+      primaryColor: Color(0xFFEC4899),
+      materialColor: MaterialColor(0xFFEC4899, {
+        50: Color(0xFFFDF2F8),
+        100: Color(0xFFFCE7F3),
+        200: Color(0xFFFBCFE8),
+        300: Color(0xFFF9A8D4),
+        400: Color(0xFFF472B6),
+        500: Color(0xFFEC4899),
+        600: Color(0xFFDB2777),
+        700: Color(0xFFBE185D),
+        800: Color(0xFF9D174D),
+        900: Color(0xFF831843),
+      }),
+    ),
+    ThemeColor(
+      name: '清新青',
+      primaryColor: Color(0xFF06B6D4),
+      materialColor: MaterialColor(0xFF06B6D4, {
+        50: Color(0xFFF0FDFA),
+        100: Color(0xFFCCFBF1),
+        200: Color(0xFF99F6E4),
+        300: Color(0xFF5EEAD4),
+        400: Color(0xFF2DD4BF),
+        500: Color(0xFF06B6D4),
+        600: Color(0xFF0891B2),
+        700: Color(0xFF0E7490),
+        800: Color(0xFF155E75),
+        900: Color(0xFF164E63),
+      }),
+    ),
+    ThemeColor(
+      name: '深空蓝',
+      primaryColor: Color(0xFF1E40AF),
+      materialColor: MaterialColor(0xFF1E40AF, {
+        50: Color(0xFFEFF6FF),
+        100: Color(0xFFDBEAFE),
+        200: Color(0xFFBFDBFE),
+        300: Color(0xFF93C5FD),
+        400: Color(0xFF60A5FA),
+        500: Color(0xFF3B82F6),
+        600: Color(0xFF2563EB),
+        700: Color(0xFF1D4ED8),
+        800: Color(0xFF1E40AF),
+        900: Color(0xFF1E3A8A),
+      }),
+    ),
+    ThemeColor(
+      name: '落日红',
+      primaryColor: Color(0xFFEF4444),
+      materialColor: MaterialColor(0xFFEF4444, {
+        50: Color(0xFFFEF2F2),
+        100: Color(0xFFFEE2E2),
+        200: Color(0xFFFECACA),
+        300: Color(0xFFFCA5A5),
+        400: Color(0xFFF87171),
+        500: Color(0xFFEF4444),
+        600: Color(0xFFDC2626),
+        700: Color(0xFFB91C1C),
+        800: Color(0xFF991B1B),
+        900: Color(0xFF7F1D1D),
+      }),
+    ),
+  ];
+
+  int get currentTab => _currentTab;
+
+  bool get isDarkMode => _isDarkMode;
+
+  ThemeColor get currentTheme => _currentTheme;
+
+  List<ThemeColor> get availableThemes => _defaultThemes;
 
   void changeTab(int index) {
-    _currentIndex = index;
+    _currentTab = index;
     notifyListeners();
   }
+
+  // 切换明暗模式
+  void toggleDarkMode(bool value) {
+    _isDarkMode = value;
+    notifyListeners();
+  }
+
+  // 更改主题色
+  void changeTheme(ThemeColor theme) {
+    _currentTheme = theme;
+    notifyListeners();
+  }
+
+  ThemeData get currentThemeData {
+    return ThemeData(
+      primarySwatch: _currentTheme.materialColor,
+      colorScheme: ColorScheme.fromSeed(
+        seedColor: _currentTheme.primaryColor,
+        brightness: _isDarkMode ? Brightness.dark : Brightness.light,
+      ),
+      useMaterial3: true,
+      fontFamily: 'CustomFont',
+    );
+  }
 }