feat: adopt material 3 theme and billing adjustments

lib/widgets/common/form_fields/currency_input_field.dart

@@ -5,10 +5,10 @@ import 'base_text_field.dart';
 import '../../../l10n/app_localizations.dart';
 
 /// 통화 입력 필드 위젯
-/// 원화(KRW)와 달러(USD)를 지원하며 자동 포맷팅을 제공합니다.
+/// KRW/JPY(정수), USD/CNY(소수점 2자리)를 지원하며 자동 포맷팅을 제공합니다.
 class CurrencyInputField extends StatefulWidget {
   final TextEditingController controller;
-  final String currency; // 'KRW' or 'USD'
+  final String currency; // 'KRW' | 'USD' | 'JPY' | 'CNY'
   final String? label;
   final String? hintText;
   final Function(double?)? onChanged;
@@ -39,6 +39,7 @@ class CurrencyInputField extends StatefulWidget {
 class _CurrencyInputFieldState extends State<CurrencyInputField> {
   late FocusNode _focusNode;
   bool _isFormatted = false;
+  bool _isPostFrameUpdating = false;
 
   @override
   void initState() {
@@ -66,6 +67,29 @@ class _CurrencyInputFieldState extends State<CurrencyInputField> {
     super.dispose();
   }
 
+  @override
+  void didUpdateWidget(covariant CurrencyInputField oldWidget) {
+    super.didUpdateWidget(oldWidget);
+    if (oldWidget.currency != widget.currency) {
+      // 통화 변경 시 빌드 이후에 안전하게 재포맷 적용
+      if (_focusNode.hasFocus) return;
+      final value = _parseValue(widget.controller.text);
+      if (value == null) return;
+      final formatted = _formatCurrency(value);
+      if (widget.controller.text == formatted || _isPostFrameUpdating) return;
+      _isPostFrameUpdating = true;
+      WidgetsBinding.instance.addPostFrameCallback((_) {
+        if (!mounted) return;
+        widget.controller.value = TextEditingValue(
+          text: formatted,
+          selection: TextSelection.collapsed(offset: formatted.length),
+        );
+        _isFormatted = true;
+        _isPostFrameUpdating = false;
+      });
+    }
+  }
+
   void _onFocusChanged() {
     if (!_focusNode.hasFocus && widget.controller.text.isNotEmpty) {
       // 포커스를 잃었을 때 포맷팅 적용
@@ -81,7 +105,7 @@ class _CurrencyInputFieldState extends State<CurrencyInputField> {
       final value = _parseValue(widget.controller.text);
       if (value != null) {
         setState(() {
-          if (widget.currency == 'KRW') {
+          if (_isIntegerCurrency(widget.currency)) {
             widget.controller.text = value.toInt().toString();
           } else {
             widget.controller.text = value.toString();
@@ -97,7 +121,7 @@ class _CurrencyInputFieldState extends State<CurrencyInputField> {
   }
 
   String _formatCurrency(double value) {
-    if (widget.currency == 'KRW') {
+    if (_isIntegerCurrency(widget.currency)) {
       return NumberFormat.decimalPattern().format(value.toInt());
     } else {
       return NumberFormat('#,##0.00').format(value);
@@ -108,13 +132,26 @@ class _CurrencyInputFieldState extends State<CurrencyInputField> {
     final cleanText = text
         .replaceAll(',', '')
         .replaceAll('₩', '')
+        .replaceAll('¥', '')
+        .replaceAll('￥', '')
         .replaceAll('\$', '')
         .trim();
     return double.tryParse(cleanText);
   }
 
+  // ignore: unused_element
   String get _prefixText {
-    return widget.currency == 'KRW' ? '₩ ' : '\$ ';
+    switch (widget.currency) {
+      case 'KRW':
+        return '₩ ';
+      case 'JPY':
+        return '¥ ';
+      case 'CNY':
+        return '¥ ';
+      case 'USD':
+      default:
+        return '4 ';
+    }
   }
 
   String _getDefaultHintText(BuildContext context) {
@@ -132,26 +169,27 @@ class _CurrencyInputFieldState extends State<CurrencyInputField> {
       keyboardType: const TextInputType.numberWithOptions(decimal: true),
       inputFormatters: [
         FilteringTextInputFormatter.allow(
-            widget.currency == 'KRW' ? RegExp(r'[0-9]') : RegExp(r'[0-9.]')),
-        if (widget.currency == 'USD')
-          // USD의 경우 소수점 이하 2자리까지만 허용
+          _isIntegerCurrency(widget.currency)
+              ? RegExp(r'[0-9]')
+              : RegExp(r'[0-9.]'),
+        ),
+        if (!_isIntegerCurrency(widget.currency))
+          // 소수 통화(USD/CNY): 소수점 이하 2자리 제한
           TextInputFormatter.withFunction((oldValue, newValue) {
             final text = newValue.text;
             if (text.isEmpty) return newValue;
 
             final parts = text.split('.');
             if (parts.length > 2) {
-              // 소수점이 2개 이상인 경우 거부
-              return oldValue;
+              return oldValue; // 소수점이 2개 이상인 경우 거부
             }
             if (parts.length == 2 && parts[1].length > 2) {
-              // 소수점 이하가 2자리를 초과하는 경우 거부
-              return oldValue;
+              return oldValue; // 소수점 이하 2자 초과 거부
             }
             return newValue;
           }),
       ],
-      prefixText: _prefixText,
+      prefixText: _getPrefixText(),
       onEditingComplete: widget.onEditingComplete,
       enabled: widget.enabled,
       onChanged: (value) {
@@ -172,3 +210,23 @@ class _CurrencyInputFieldState extends State<CurrencyInputField> {
     );
   }
 }
+
+bool _isIntegerCurrency(String code) => code == 'KRW' || code == 'JPY';
+
+// 안전한 프리픽스 계산 함수(모든 통화 지원)
+String _currencySymbol(String code) {
+  switch (code) {
+    case 'KRW':
+      return '₩';
+    case 'JPY':
+    case 'CNY':
+      return '¥';
+    case 'USD':
+    default:
+      return '\$';
+  }
+}
+
+extension on _CurrencyInputFieldState {
+  String _getPrefixText() => '${_currencySymbol(widget.currency)} ';
+}