improved performance and battery usage on older devices

lib/widget/debug/cache_view.dart

@@ -2,10 +2,9 @@ import 'dart:convert';
 import 'package:filesize/filesize.dart';
 import 'package:flutter/material.dart';
 import 'package:jiffy/jiffy.dart';
-import 'package:localstore/localstore.dart';
 
 import '../../../widget/placeholder_view.dart';
-import '../../api/request_cache.dart';
+import '../../api/cache_store.dart';
 import '../app_progress_indicator.dart';
 import 'json_viewer.dart';
 
@@ -15,31 +14,11 @@ class CacheView extends StatefulWidget {
   @override
   State<CacheView> createState() => _CacheViewState();
 
-  Future<void> clear() async {
-    await Localstore.instance.collection(RequestCache.collection).delete();
-  }
-
-  Future<int> totalSize() async {
-    final data = await Localstore.instance
-        .collection(RequestCache.collection)
-        .get();
-    if (data == null || data.isEmpty) return 0;
-    return data.values.fold<int>(
-          0,
-          (sum, value) => sum + jsonEncode(value).length,
-        ) *
-        8;
-  }
 }
 
 class _CacheViewState extends State<CacheView> {
-  late Future<Map<String, dynamic>?> files;
-
-  @override
-  void initState() {
-    files = Localstore.instance.collection(RequestCache.collection).get();
-    super.initState();
-  }
+  late final Future<Map<String, CacheEntry>> files = CacheStore.instance
+      .readAll();
 
   @override
   Widget build(BuildContext context) => Scaffold(
@@ -47,24 +26,23 @@ class _CacheViewState extends State<CacheView> {
     body: FutureBuilder(
       future: files,
       builder: (context, snapshot) {
-        if (snapshot.hasData) {
+        if (snapshot.hasData && snapshot.data!.isNotEmpty) {
           return ListView.builder(
             itemCount: snapshot.data!.length,
             itemBuilder: (context, index) {
               final key = snapshot.data!.keys.elementAt(index);
-              final element = snapshot.data![key] as Map<String, dynamic>;
-              final filename = key.split('/').last;
+              final element = snapshot.data![key]!;
 
               return ListTile(
                 leading: const Icon(Icons.text_snippet_outlined),
-                title: Text(filename),
+                title: Text(key),
                 subtitle: Text(
-                  '${filesize(jsonEncode(element).length * 8)}, ${Jiffy.parseFromMillisecondsSinceEpoch(element['lastupdate'] as int).fromNow()}',
+                  '${filesize(utf8.encode(element.json).length)}, ${Jiffy.parseFromMillisecondsSinceEpoch(element.lastUpdate).fromNow()}',
                 ),
                 trailing: const Icon(Icons.arrow_right),
                 onTap: () => JsonViewer.asDialog(
                   context,
-                  jsonDecode(element['json'] as String) as Map<String, dynamic>,
+                  jsonDecode(element.json) as Map<String, dynamic>,
                 ),
               );
             },