feat: 优化

flutter_monisuo/lib/ui/shared/ui_constants.dart

@@ -0,0 +1,62 @@
+import 'package:flutter/material.dart';
+
+/// 应用颜色常量
+class AppColors {
+  AppColors._();
+
+  static const Color up = Color(0xFF00C853);
+  static const Color down = Color(0xFFFF5252);
+  static const Color deposit = Color(0xFF00C853);
+  static const Color withdraw = Color(0xFFFF9800);
+  static const Color trade = Color(0xFF2196F3);
+
+  static const List<Color> gradientColors = [
+    Color(0xFF00D4AA),
+    Color(0xFF00B894),
+  ];
+}
+
+/// 表单验证器
+class Validators {
+  Validators._();
+
+  static String? amount(String? value) {
+    if (value == null || value.isEmpty) {
+      return '请输入金额';
+    }
+    final amount = double.tryParse(value);
+    if (amount == null || amount <= 0) {
+      return '请输入有效金额';
+    }
+    return null;
+  }
+
+  static String? price(String? value) {
+    if (value == null || value.isEmpty) {
+      return '请输入价格';
+    }
+    final price = double.tryParse(value);
+    if (price == null || price <= 0) {
+      return '请输入有效价格';
+    }
+    return null;
+  }
+
+  static String? quantity(String? value) {
+    if (value == null || value.isEmpty) {
+      return '请输入数量';
+    }
+    final quantity = double.tryParse(value);
+    if (quantity == null || quantity <= 0) {
+      return '请输入有效数量';
+    }
+    return null;
+  }
+
+  static String? required(String? value, String fieldName) {
+    if (value == null || value.isEmpty) {
+      return '请输入$fieldName';
+    }
+    return null;
+  }
+}