64 lines
2.0 KiB
Dart
64 lines
2.0 KiB
Dart
import 'dart:convert';
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import 'package:novyronst/tools/util/sp_tool.dart';
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import 'package:shared_preferences/shared_preferences.dart';
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/// 本地搜索历史（SharedPreferences），key 与 [AppSp] 规则一致（`.search.history`）。
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class SearchHistoryUtil {
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SearchHistoryUtil._();
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static const String _storageKey = 'search.history';
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static const int _maxHistory = 20;
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static Future<List<String>> _readList(SharedPreferences prefs) async {
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final raw = prefs.getString(_storageKey);
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if (raw == null || raw.isEmpty) return [];
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try {
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final decoded = jsonDecode(raw);
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if (decoded is! List) return [];
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return decoded.map((e) => e.toString()).where((s) => s.isNotEmpty).toList();
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} catch (_) {
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return [];
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}
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}
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static Future<void> _writeList(SharedPreferences prefs, List<String> list) async {
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await prefs.setString(_storageKey, jsonEncode(list));
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}
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/// 查询搜索历史列表（新记录在前）。
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static Future<List<String>> getSearchList() async {
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final prefs = await SpTool.getInstance();
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return _readList(prefs);
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}
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/// 添加一条搜索；去重、去空白，并移到最前。
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static Future<void> addSearch(String keyword) async {
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final q = keyword.trim();
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if (q.isEmpty) return;
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final prefs = await SpTool.getInstance();
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final list = await _readList(prefs);
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list.removeWhere((e) => e == q);
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list.insert(0, q);
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if (list.length > _maxHistory) {
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list.removeRange(_maxHistory, list.length);
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}
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await _writeList(prefs, list);
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}
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/// 删除单条搜索记录。
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static Future<void> deleteSearch(String keyword) async {
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final prefs = await SpTool.getInstance();
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final list = await _readList(prefs);
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list.removeWhere((e) => e == keyword);
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await _writeList(prefs, list);
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}
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/// 清空全部搜索历史。
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static Future<void> clearAllSearch() async {
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final prefs = await SpTool.getInstance();
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await prefs.remove(_storageKey);
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}
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}
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