add pagination
This commit is contained in:
Sai Naw Wun
@@ -8,116 +8,126 @@ import 'package:fcs/domain/entities/package.dart';
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import 'package:fcs/domain/entities/user.dart';
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import 'package:fcs/domain/vo/delivery_address.dart';
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import 'package:fcs/helpers/firebase_helper.dart';
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import 'package:fcs/helpers/paginator.dart';
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import 'package:fcs/pages/main/model/base_model.dart';
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import 'package:fcs/pagination/paginator_listener.dart';
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import 'package:logging/logging.dart';
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import 'package:path/path.dart' as Path;
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class PackageModel extends BaseModel {
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final log = Logger('PackageModel');
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StreamSubscription<QuerySnapshot> listener;
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PaginatorListener packages;
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PaginatorListener customerPackages;
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PaginatorListener activePackages;
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List<Package> get packages => _menuSelectedIndex == 1
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? _packages
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: List<Package>.from(_delivered.values);
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List<Package> _packages = [];
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Paginator _delivered;
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bool isLoading = false;
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int _menuSelectedIndex = 1;
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set menuSelectedIndex(int index) {
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_menuSelectedIndex = index;
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_loadPackages(_menuSelectedIndex == 2);
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_loadCustomerPackages(_menuSelectedIndex == 2);
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notifyListeners();
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}
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get menuSelectedIndex => _menuSelectedIndex;
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initData(bool forCustomer) {
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void privilegeChanged() {
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if (user != null) {
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_initData();
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}
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}
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Future<void> _initData() async {
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logout();
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_menuSelectedIndex = 1;
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_loadPackages(forCustomer);
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_delivered = _getDelivered(forCustomer);
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_delivered.load();
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packages = PaginatorListener<Package>(
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(data, id) => Package.fromMap(data, id), onChange: () {
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notifyListeners();
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}, rowPerLoad: 30, insertNewByListener: true);
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customerPackages = PaginatorListener<Package>(
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(data, id) => Package.fromMap(data, id), onChange: () {
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notifyListeners();
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}, rowPerLoad: 30, insertNewByListener: true);
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activePackages = PaginatorListener<Package>(
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(data, id) => Package.fromMap(data, id), onChange: () {
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notifyListeners();
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}, rowPerLoad: 30, insertNewByListener: true);
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_loadPackages(_menuSelectedIndex == 2);
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_loadCustomerPackages(_menuSelectedIndex == 2);
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_loadActivePackages();
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}
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@override
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logout() async {
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if (_delivered != null) _delivered.close();
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if (listener != null) await listener.cancel();
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_packages = [];
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if (customerPackages != null) customerPackages.close();
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if (packages != null) packages.close();
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if (activePackages != null) activePackages.close();
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}
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Future<void> loadMore({bool isCustomer}) async {
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if (_delivered.ended || menuSelectedIndex == 1)
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return; // when delivered menu is not selected return
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isLoading = true;
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notifyListeners();
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await _delivered.load(onFinished: () {
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isLoading = false;
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notifyListeners();
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});
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}
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Future<void> refresh({bool isCustomer}) async {
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if (menuSelectedIndex == 1)
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return; // when delivered menu is not selected return
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await _delivered.refresh(onFinished: () {
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notifyListeners();
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});
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}
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Paginator _getDelivered(bool isCustomer) {
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if (!isCustomer) {
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if (user == null ||
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!((user.hasPackages() ||
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user.hasReceiving() ||
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user.hasProcessing()))) throw "No privilege";
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}
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var pageQuery = Firestore.instance
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.collection("/$packages_collection")
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.where("is_delivered", isEqualTo: true)
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.where("is_deleted", isEqualTo: false);
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if (isCustomer) {
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pageQuery = pageQuery.where("user_id", isEqualTo: user.id);
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}
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pageQuery = pageQuery.orderBy("status_date", descending: true);
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var paginator = new Paginator(pageQuery, rowPerLoad: 20, toObj: (data, id) {
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return Package.fromMap(data, id);
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});
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return paginator;
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}
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Future<void> _loadPackages(bool forCustomer) async {
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Future<void> _loadPackages(bool isDelivered) async {
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if (user == null) return;
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if (!forCustomer &&
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!((user.hasPackages() || user.hasReceiving() || user.hasProcessing())))
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if (!((user.hasPackages() || user.hasReceiving() || user.hasProcessing())))
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return;
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String path = "/$packages_collection";
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if (listener != null) listener.cancel();
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_packages = [];
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try {
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var q = Firestore.instance
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.collection("$path")
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.where("is_delivered", isEqualTo: false)
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.where("is_deleted", isEqualTo: false);
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Query listenerQuery = Firestore.instance
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.collection(path)
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.where("is_delivered", isEqualTo: isDelivered);
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Query pageQuery = Firestore.instance
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.collection(path)
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.where("is_delivered", isEqualTo: isDelivered);
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if (forCustomer) {
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q = q.where("user_id", isEqualTo: user.id);
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}
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q = q.orderBy("update_time", descending: true);
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listener = q.snapshots().listen((QuerySnapshot snapshot) {
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_packages.clear();
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_packages = snapshot.documents.map((documentSnapshot) {
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var package = Package.fromMap(
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documentSnapshot.data, documentSnapshot.documentID);
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return package;
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}).toList();
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notifyListeners();
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});
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pageQuery = pageQuery.orderBy("update_time", descending: true);
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packages.refresh(listeningQuery: listenerQuery, pageQuery: pageQuery);
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} catch (e) {
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log.warning("Error!! $e");
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}
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}
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Future<void> _loadCustomerPackages(bool isDelivered) async {
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if (user == null) return;
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String path = "/$packages_collection";
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try {
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Query listenerQuery = Firestore.instance
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.collection(path)
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.where("is_delivered", isEqualTo: isDelivered)
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.where("user_id", isEqualTo: user.id);
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Query pageQuery = Firestore.instance
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.collection(path)
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.where("is_delivered", isEqualTo: isDelivered)
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.where("user_id", isEqualTo: user.id)
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.orderBy("update_time", descending: true);
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customerPackages.refresh(
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listeningQuery: listenerQuery, pageQuery: pageQuery);
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} catch (e) {
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log.warning("Error!! $e");
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}
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}
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Future<void> _loadActivePackages() async {
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if (user == null) return;
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if (!((user.hasPackages() || user.hasReceiving() || user.hasProcessing())))
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return;
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String path = "/$packages_collection";
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try {
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Query listenerQuery = Firestore.instance
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.collection(path)
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.where("is_delivered", isEqualTo: false);
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Query pageQuery = Firestore.instance
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.collection(path)
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.where("is_delivered", isEqualTo: false);
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pageQuery = pageQuery.orderBy("update_time", descending: true);
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activePackages.refresh(
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listeningQuery: listenerQuery, pageQuery: pageQuery);
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} catch (e) {
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log.warning("Error!! $e");
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}
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@@ -8,6 +8,7 @@ import 'package:fcs/pages/widgets/local_popup_menu_button.dart';
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import 'package:fcs/pages/widgets/local_popupmenu.dart';
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import 'package:fcs/pages/widgets/local_text.dart';
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import 'package:fcs/pages/widgets/progress.dart';
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import 'package:fcs/pagination/paginator_listview.dart';
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import 'package:flutter/cupertino.dart';
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import 'package:flutter/material.dart';
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import 'package:provider/provider.dart';
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@@ -22,26 +23,18 @@ class PackageList extends StatefulWidget {
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class _PackageListState extends State<PackageList> {
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bool _isLoading = false;
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var _controller = ScrollController();
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@override
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void initState() {
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super.initState();
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_controller.addListener(() async {
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if (_controller.position.pixels == _controller.position.maxScrollExtent) {
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Provider.of<PackageModel>(context, listen: false)
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.loadMore(isCustomer: widget.forCustomer);
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}
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});
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Provider.of<PackageModel>(context, listen: false)
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.initData(widget.forCustomer);
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}
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@override
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Widget build(BuildContext context) {
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var packageModel = Provider.of<PackageModel>(context);
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var packages = packageModel.packages;
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var packages = widget.forCustomer
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? packageModel.customerPackages
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: packageModel.packages;
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final popupMenu = LocalPopupMenuButton(
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popmenus: [
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@@ -90,43 +83,14 @@ class _PackageListState extends State<PackageList> {
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popupMenu
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],
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),
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body: Column(
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children: [
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Expanded(
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child: RefreshIndicator(
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child: ListView.separated(
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controller: _controller,
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separatorBuilder: (context, index) => Divider(
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color: Colors.grey,
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height: 1,
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),
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scrollDirection: Axis.vertical,
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itemCount: packages.length,
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itemBuilder: (BuildContext context, int index) {
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return PackageListRow(
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key: ValueKey(packages[index].id),
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package: packages[index],
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isCustomer: widget.forCustomer,
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);
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}),
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onRefresh: () =>
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packageModel.refresh(isCustomer: widget.forCustomer),
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),
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),
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packageModel.isLoading
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? Container(
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padding: EdgeInsets.all(8),
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color: primaryColor,
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child: Row(
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mainAxisAlignment: MainAxisAlignment.center,
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children: [
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Text("Loading...",
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style: TextStyle(color: Colors.white)),
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],
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),
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)
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: Container(),
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],
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body: PaginatorListView<Package>(
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paginatorListener: packages,
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rowBuilder: (p) => PackageListRow(
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key: ValueKey(p.id),
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package: p,
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isCustomer: widget.forCustomer,
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),
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color: primaryColor,
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)),
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);
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}
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