feat(settings): custom font by type font name

Author: ILoveScratch2

lib/l10n/app_en.arb

@@ -85,6 +85,10 @@
   "settingsFontFamilyDesc": "Application font family",
   "settingsFontHarmonyOS": "HarmonyOS Sans SC (Default, Recommended)",
   "settingsFontSystem": "System Default",
+  "settingsFontCustomOption": "Custom",
+  "settingsCustomFontTitle": "Custom font",
+  "settingsCustomFontDesc": "Enter the name of the system font to use",
+  "settingsCustomFontHint": "e.g. LXGW WenKai Screen",
 
   "settingsSendModeTitle": "Send Mode",
   "settingsSendModeDesc": "Keyboard shortcut for sending messages",

lib/l10n/app_localizations.dart

@@ -494,6 +494,30 @@ abstract class AppLocalizations {
   /// **'System Default'**
   String get settingsFontSystem;
 
+  /// No description provided for @settingsFontCustomOption.
+  ///
+  /// In en, this message translates to:
+  /// **'Custom'**
+  String get settingsFontCustomOption;
+
+  /// No description provided for @settingsCustomFontTitle.
+  ///
+  /// In en, this message translates to:
+  /// **'Custom font'**
+  String get settingsCustomFontTitle;
+
+  /// No description provided for @settingsCustomFontDesc.
+  ///
+  /// In en, this message translates to:
+  /// **'Enter the name of the system font to use'**
+  String get settingsCustomFontDesc;
+
+  /// No description provided for @settingsCustomFontHint.
+  ///
+  /// In en, this message translates to:
+  /// **'e.g. LXGW WenKai Screen'**
+  String get settingsCustomFontHint;
+
   /// No description provided for @settingsSendModeTitle.
   ///
   /// In en, this message translates to:

lib/l10n/app_localizations_en.dart

@@ -215,6 +215,19 @@ class AppLocalizationsEn extends AppLocalizations {
   @override
   String get settingsFontSystem => 'System Default';
 
+  @override
+  String get settingsFontCustomOption => 'Custom';
+
+  @override
+  String get settingsCustomFontTitle => 'Custom font';
+
+  @override
+  String get settingsCustomFontDesc =>
+      'Enter the name of the system font to use';
+
+  @override
+  String get settingsCustomFontHint => 'e.g. LXGW WenKai Screen';
+
   @override
   String get settingsSendModeTitle => 'Send Mode';
 

lib/l10n/app_localizations_zh.dart

@@ -207,6 +207,18 @@ class AppLocalizationsZh extends AppLocalizations {
   @override
   String get settingsFontSystem => '系统默认';
 
+  @override
+  String get settingsFontCustomOption => '自定义';
+
+  @override
+  String get settingsCustomFontTitle => '自定义字体';
+
+  @override
+  String get settingsCustomFontDesc => '输入要使用的系统字体名称';
+
+  @override
+  String get settingsCustomFontHint => '例如：LXGW WenKai Screen';
+
   @override
   String get settingsSendModeTitle => '发送模式';
 

lib/l10n/app_zh.arb

@@ -76,6 +76,10 @@
   "settingsFontFamilyDesc": "应用使用的字体",
   "settingsFontHarmonyOS": "HarmonyOS Sans SC (默认,推荐)",
   "settingsFontSystem": "系统默认",
+  "settingsFontCustomOption": "自定义",
+  "settingsCustomFontTitle": "自定义字体",
+  "settingsCustomFontDesc": "输入要使用的系统字体名称",
+  "settingsCustomFontHint": "例如：LXGW WenKai Screen",
 
   "settingsSendModeTitle": "发送模式",
   "settingsSendModeDesc": "发送使用的快捷键",

lib/models/app_state.dart

@@ -55,6 +55,12 @@ class AppState extends ChangeNotifier {
   String? get fontFamily {
     final font = _settingsService.getValue<String>('fontFamily', 'System Default');
     if (font == 'System Default') return null;
+    if (font == '__custom__') {
+      final customFontName =
+          _settingsService.getValue<String>('customFontName', '');
+      if (customFontName.isEmpty) return null;
+      return customFontName;
+    }
     return font;
   }