Implement thread list update feature

This commit is contained in:
ChronosX88 2022-04-19 02:33:56 +03:00
parent a0e45d81ff
commit cf15aae5ac
Signed by: ChronosXYZ
GPG Key ID: 085A69A82C8C511A
3 changed files with 50 additions and 34 deletions

View File

@ -93,6 +93,20 @@ class _MyHomePageState extends State<MyHomePage> {
// Here we take the value from the MyHomePage object that was created by // Here we take the value from the MyHomePage object that was created by
// the App.build method, and use it to set our appbar title. // the App.build method, and use it to set our appbar title.
title: Text(widget.title), title: Text(widget.title),
actions: [
TextButton.icon(
onPressed: () {
ScaffoldMessenger.of(context).showSnackBar(
const SnackBar(
content: Text('Обновление списка тредов...')),
);
Provider.of<ThreadListModel>(context, listen: false).update();
},
label: const Text("Обновить"),
style: TextButton.styleFrom(
primary: Theme.of(context).colorScheme.onPrimary),
icon: Icon(Icons.sync))
],
), ),
body: Center( body: Center(
child: Container( child: Container(

View File

@ -6,6 +6,8 @@ class ThreadListModel extends ChangeNotifier {
String currentGroup = ""; String currentGroup = "";
NNTPClient? client; NNTPClient? client;
Map<String, Map<int, List<ThreadItem>>> threads = {}; Map<String, Map<int, List<ThreadItem>>> threads = {};
int _pageNum = -1;
List<ThreadItem> _curItems = [];
Future<void> selectNewsgroup(String name) async { Future<void> selectNewsgroup(String name) async {
if (currentGroup == name) return; if (currentGroup == name) return;
@ -13,27 +15,29 @@ class ThreadListModel extends ChangeNotifier {
currentGroup = name; currentGroup = name;
await client!.selectGroup(name); await client!.selectGroup(name);
threads.putIfAbsent(name, () => {}); threads.putIfAbsent(name, () => {});
_curItems.clear();
_pageNum = -1;
notifyListeners(); notifyListeners();
} }
Future<List<ThreadItem>> getNewThreads( Future<List<ThreadItem>> getNewThreads(bool clearCache) async {
int perPage, int pageNum, bool clearCache) async {
if (currentGroup == "") return []; if (currentGroup == "") return [];
List<ThreadItem> items = [];
_pageNum += 1;
if (clearCache) { if (clearCache) {
threads[currentGroup]?.clear(); threads[currentGroup]?.clear();
} }
if (threads[currentGroup]!.containsKey(pageNum)) { if (threads[currentGroup]!.containsKey(_pageNum)) {
items.addAll(threads[currentGroup]![pageNum]!); _curItems.addAll(threads[currentGroup]![_pageNum]!);
} else { } else {
var resp = await client!.getNewThreads(perPage, pageNum); var resp = await client!.getNewThreads(10, _pageNum);
resp.forEach((pair) { resp.forEach((pair) {
var number = pair.item1; var number = pair.item1;
var msg = pair.item2; var msg = pair.item2;
items.add(ThreadItem( _curItems.add(ThreadItem(
msg.getHeaderValue("Message-Id")!, msg.getHeaderValue("Message-Id")!,
number, number,
msg.getHeaderValue("Subject")!, msg.getHeaderValue("Subject")!,
@ -42,9 +46,18 @@ class ThreadListModel extends ChangeNotifier {
msg.decodeTextPlainPart()!)); msg.decodeTextPlainPart()!));
}); });
threads[currentGroup]![pageNum] = items; if (resp.isEmpty) _pageNum -= 1;
threads[currentGroup]![_pageNum] = List.from(_curItems);
} }
return items; return _curItems;
}
void update() {
_curItems.clear();
_pageNum = -1;
threads[currentGroup]!.clear();
notifyListeners();
} }
} }

View File

@ -1,7 +1,6 @@
import 'package:flutter/material.dart'; import 'package:flutter/material.dart';
import 'package:provider/provider.dart'; import 'package:provider/provider.dart';
import 'package:wind/thread_list_model.dart'; import 'package:wind/thread_list_model.dart';
import 'package:wind/thread_screen.dart';
class ThreadListView extends StatefulWidget { class ThreadListView extends StatefulWidget {
@override @override
@ -9,8 +8,6 @@ class ThreadListView extends StatefulWidget {
} }
class ThreadListViewState extends State<ThreadListView> { class ThreadListViewState extends State<ThreadListView> {
List<ThreadItem> _items = [];
int _pageNum = 0;
String _curGroup = ""; String _curGroup = "";
@override @override
@ -24,16 +21,13 @@ class ThreadListViewState extends State<ThreadListView> {
if (snapshot.hasData && if (snapshot.hasData &&
snapshot.connectionState != ConnectionState.waiting) { snapshot.connectionState != ConnectionState.waiting) {
List<ThreadItem> data = List.from(snapshot.data!); List<ThreadItem> data = List.from(snapshot.data!);
_items.addAll(data); if (data.isNotEmpty && data.last.number != -100500)
if (_items.isNotEmpty && data.add(ThreadItem("", -100500, "", "", "",
_items.last.number != -100500 &&
data.isNotEmpty)
_items.add(ThreadItem("", -100500, "", "", "",
"")); // magic item (for button "load more") "")); // magic item (for button "load more")
return _curGroup != "" return _curGroup != ""
? _threadView() ? _threadView(data)
: Center( : Center(
child: Text("Newsgroup is not selected", child: Text("Новостная группа не выбрана",
style: TextStyle( style: TextStyle(
fontWeight: FontWeight.bold, fontSize: 16))); fontWeight: FontWeight.bold, fontSize: 16)));
} else if (snapshot.hasError) { } else if (snapshot.hasError) {
@ -46,22 +40,18 @@ class ThreadListViewState extends State<ThreadListView> {
Future<List<ThreadItem>> _fetchThreadList(BuildContext context) async { Future<List<ThreadItem>> _fetchThreadList(BuildContext context) async {
var model = context.read<ThreadListModel>(); var model = context.read<ThreadListModel>();
if (model.currentGroup != _curGroup) { _curGroup = model.currentGroup;
_items.clear(); return await model.getNewThreads(false);
_curGroup = model.currentGroup;
_pageNum = 0;
}
return await model.getNewThreads(10, _pageNum, false);
} }
Widget _threadView() { Widget _threadView(List<ThreadItem> items) {
return _items.isNotEmpty return items.isNotEmpty
? Scrollbar( ? Scrollbar(
child: ListView.builder( child: ListView.builder(
key: PageStorageKey("threadList"), key: PageStorageKey("threadList"),
itemCount: _items.length, itemCount: items.length,
itemBuilder: (context, index) { itemBuilder: (context, index) {
if (_items[index].number == -100500) { if (items[index].number == -100500) {
return Container( return Container(
height: 100, height: 100,
padding: EdgeInsets.all(20), padding: EdgeInsets.all(20),
@ -72,19 +62,18 @@ class ThreadListViewState extends State<ThreadListView> {
), ),
onPressed: () { onPressed: () {
setState(() { setState(() {
_pageNum += 1; items.removeLast();
_items.removeLast();
}); });
}, },
child: Text('Load more'), child: Text('Загрузить больше'),
), ),
); );
} else } else
return ThreadListItemView(item: _items[index]); return ThreadListItemView(item: items[index]);
}), }),
) )
: Center( : Center(
child: Text("This newsgroup is empty", child: Text("Эта новостная группа пуста",
style: TextStyle(fontWeight: FontWeight.bold, fontSize: 16))); style: TextStyle(fontWeight: FontWeight.bold, fontSize: 16)));
} }
} }