Initial commit

lib/widgets/theme_builder.dart

@@ -0,0 +1,103 @@
+// SPDX-FileCopyrightText: 2019-Present Christian Kußowski
+// SPDX-FileCopyrightText: 2019-Present Contributors to FluffyChat
+//
+// SPDX-License-Identifier: AGPL-3.0-or-later
+
+import 'package:collection/collection.dart';
+import 'package:dynamic_color/dynamic_color.dart';
+import 'package:tatchat/utils/color_value.dart';
+import 'package:material_ui/material_ui.dart';
+import 'package:provider/provider.dart';
+import 'package:shared_preferences/shared_preferences.dart';
+
+class ThemeBuilder extends StatefulWidget {
+  final Widget Function(
+    BuildContext context,
+    ThemeMode themeMode,
+    Color? primaryColor,
+  )
+  builder;
+
+  final String themeModeSettingsKey;
+  final String primaryColorSettingsKey;
+
+  const ThemeBuilder({
+    required this.builder,
+    this.themeModeSettingsKey = 'theme_mode',
+    this.primaryColorSettingsKey = 'primary_color',
+    super.key,
+  });
+
+  @override
+  State<ThemeBuilder> createState() => ThemeController();
+}
+
+class ThemeController extends State<ThemeBuilder> {
+  SharedPreferences? _sharedPreferences;
+  ThemeMode? _themeMode;
+  Color? _primaryColor;
+
+  ThemeMode get themeMode => _themeMode ?? ThemeMode.system;
+
+  Color? get primaryColor => _primaryColor;
+
+  static ThemeController of(BuildContext context) =>
+      Provider.of<ThemeController>(context, listen: false);
+
+  Future<void> _loadData(_) async {
+    final preferences = _sharedPreferences ??=
+        await SharedPreferences.getInstance();
+
+    final rawThemeMode = preferences.getString(widget.themeModeSettingsKey);
+    final rawColor = preferences.getInt(widget.primaryColorSettingsKey);
+
+    setState(() {
+      _themeMode = ThemeMode.values.singleWhereOrNull(
+        (value) => value.name == rawThemeMode,
+      );
+      _primaryColor = rawColor == null ? null : Color(rawColor);
+    });
+  }
+
+  Future<void> setThemeMode(ThemeMode newThemeMode) async {
+    final preferences = _sharedPreferences ??=
+        await SharedPreferences.getInstance();
+    await preferences.setString(widget.themeModeSettingsKey, newThemeMode.name);
+    setState(() {
+      _themeMode = newThemeMode;
+    });
+  }
+
+  Future<void> setPrimaryColor(Color? newPrimaryColor) async {
+    final preferences = _sharedPreferences ??=
+        await SharedPreferences.getInstance();
+    if (newPrimaryColor == null) {
+      await preferences.remove(widget.primaryColorSettingsKey);
+    } else {
+      await preferences.setInt(
+        widget.primaryColorSettingsKey,
+        newPrimaryColor.hexValue,
+      );
+    }
+    setState(() {
+      _primaryColor = newPrimaryColor;
+    });
+  }
+
+  @override
+  void initState() {
+    WidgetsBinding.instance.addPostFrameCallback(_loadData);
+    super.initState();
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return Provider(
+      create: (_) => this,
+      child: DynamicColorBuilder(
+        builder: (light, _) =>
+            widget.builder(context, themeMode, primaryColor ?? light?.primary),
+      ),
+    );
+  }
+}