141 lines
4.2 KiB
Dart
141 lines
4.2 KiB
Dart
import 'package:flutter/material.dart';
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import 'package:flutter_riverpod/flutter_riverpod.dart';
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import '../../models/alert.dart';
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import '../../app/theme.dart';
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import '../../providers/devices_provider.dart';
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import '../../utils/formatters.dart';
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/// 告警列表页（底部导航第 2 个 tab）。
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class AlertsPage extends ConsumerWidget {
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const AlertsPage({super.key});
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Color _levelColor(BuildContext context, AlertLevel level) {
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final semantic = Theme.of(context).extension<AppSemanticColors>();
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switch (level) {
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case AlertLevel.critical:
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return Colors.red;
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case AlertLevel.warning:
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return Colors.orange;
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case AlertLevel.info:
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return semantic?.info ?? Theme.of(context).colorScheme.primary;
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}
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}
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IconData _levelIcon(AlertLevel level) {
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switch (level) {
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case AlertLevel.critical:
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return Icons.error;
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case AlertLevel.warning:
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return Icons.warning_amber;
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case AlertLevel.info:
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return Icons.info_outline;
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}
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}
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@override
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Widget build(BuildContext context, WidgetRef ref) {
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final alertsAsync = ref.watch(alertsProvider);
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return Scaffold(
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appBar: AppBar(title: const Text('告警中心')),
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body: alertsAsync.when(
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loading: () => const Center(child: CircularProgressIndicator()),
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error: (error, _) => Center(
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child: Column(
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mainAxisSize: MainAxisSize.min,
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children: [
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const Text('告警列表加载失败'),
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const SizedBox(height: 8),
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FilledButton.tonal(
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onPressed: () => ref.refresh(alertsProvider),
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child: const Text('重试'),
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),
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],
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),
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),
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data: (alerts) {
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if (alerts.isEmpty) {
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return const Center(child: Text('暂无告警'));
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}
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return RefreshIndicator(
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onRefresh: () async => ref.refresh(alertsProvider.future),
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child: ListView.builder(
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physics: const AlwaysScrollableScrollPhysics(),
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itemCount: alerts.length,
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itemBuilder: (context, index) =>
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_buildAlertCard(context, alerts[index]),
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),
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);
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},
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),
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);
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}
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Widget _buildAlertCard(BuildContext context, Alert alert) {
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final color = _levelColor(context, alert.level);
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return Card(
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margin: const EdgeInsets.symmetric(horizontal: 16, vertical: 6),
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child: Padding(
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padding: const EdgeInsets.all(16),
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child: Column(
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crossAxisAlignment: CrossAxisAlignment.start,
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children: [
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Row(
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children: [
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Icon(_levelIcon(alert.level), color: color, size: 20),
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const SizedBox(width: 8),
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Expanded(
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child: Text(
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alert.title,
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style: const TextStyle(fontWeight: FontWeight.w600),
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),
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),
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_buildLevelTag(alert, color),
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],
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),
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const SizedBox(height: 8),
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Text(
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alert.message,
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style: Theme.of(context).textTheme.bodyMedium,
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),
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const SizedBox(height: 8),
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Row(
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children: [
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Expanded(
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child: Text(
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alert.deviceName,
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style: Theme.of(context).textTheme.bodySmall,
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),
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),
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Text(
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Formatters.formatDateTime(alert.occurredAt),
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style: Theme.of(context).textTheme.bodySmall,
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),
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],
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),
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],
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),
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),
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);
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}
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Widget _buildLevelTag(Alert alert, Color color) {
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return Container(
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padding: const EdgeInsets.symmetric(horizontal: 8, vertical: 2),
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decoration: BoxDecoration(
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color: color.withOpacity(0.15),
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borderRadius: BorderRadius.circular(999),
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),
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child: Text(
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alert.acknowledged ? '${alert.level.label}·已确认' : alert.level.label,
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style: TextStyle(
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color: color,
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fontSize: 12,
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fontWeight: FontWeight.w600,
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),
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),
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);
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}
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}
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