water-management-system/mobile-app/lib/shared/widgets/empty_state.dart

import 'package:flutter/material.dart';

/// 空状态组件
class EmptyState extends StatelessWidget {
  final IconData icon;
  final String message;
  final String? actionLabel;
  final VoidCallback? onAction;

  const EmptyState({
    super.key,
    this.icon = Icons.inbox,
    required this.message,
    this.actionLabel,
    this.onAction,
  });

  @override
  Widget build(BuildContext context) {
    return Center(
      child: Padding(
        padding: const EdgeInsets.all(32),
        child: Column(
          mainAxisSize: MainAxisSize.min,
          children: [
            Icon(icon, size: 64, color: Colors.grey[400]),
            const SizedBox(height: 16),
            Text(
              message,
              textAlign: TextAlign.center,
              style: TextStyle(
                fontSize: 16,
                color: Colors.grey[600],
              ),
            ),
            if (actionLabel != null && onAction != null) ...[
              const SizedBox(height: 16),
              ElevatedButton(
                onPressed: onAction,
                child: Text(actionLabel!),
              ),
            ],
          ],
        ),
      ),
    );
  }
}