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add paginator

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This commit is contained in:
Sai Naw Wun
2020-10-15 19:40:03 +06:30
parent caf600e4eb
commit 9d59e59e4d
5 changed files with 259 additions and 142 deletions
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48
lib/helpers/pagination.dart → lib/helpers/paginator.dart
View File

@@ -1,50 +1,50 @@
import 'dart:async';
import 'package:cloud_firestore/cloud_firestore.dart';
import 'package:fcs/pages/widgets/callbacks.dart';
import 'package:logging/logging.dart';
typedef ToObj = Function(Map<String, dynamic> data, String id);
/*
* Pagination load data in page
*/
class Pagination {
final log = Logger('PaginationModel');
class Paginator<T> {
final log = Logger('Paginator');
final int rowPerLoad;
DocumentSnapshot prev;
bool ended = false;
bool isLoading = false;
List<T> values = [];
ToObj toObj;
Query pageQuery;
Pagination(Query pageQuery, {this.rowPerLoad = 20}) {
this.pageQuery = pageQuery;
initData();
}
void initData() async {
Paginator(this.pageQuery, {this.rowPerLoad = 20, this.toObj}) {
_clearState();
load();
}
void _clearState() {
prev = null;
ended = false;
if (controller != null) controller.close();
}
StreamController<DocumentSnapshot> controller;
Stream<DocumentSnapshot> get stream {
if (controller != null) {
controller.close();
}
controller = StreamController<DocumentSnapshot>(onCancel: _clearState);
return controller.stream;
isLoading = false;
values = [];
}
void close() {
_clearState();
}
Future<bool> load() async {
Future<void> refresh({CallBack onFinished}) async {
_clearState();
await load();
if (onFinished != null) onFinished();
}
Future<bool> load({CallBack onFinished}) async {
if (ended) return null;
isLoading = true;
Query _query =
prev != null ? pageQuery.startAfterDocument(prev) : pageQuery;
try {
@@ -56,14 +56,14 @@ class Pagination {
ended = count < rowPerLoad;
prev = count > 0 ? snapshot.documents[count - 1] : prev;
snapshot.documents.forEach((e) {
controller.add(e);
values.add(toObj(e.data, e.documentID));
});
if (ended) {
controller.add(null);
}
});
} catch (e) {
log.warning("Error!! $e");
} finally {
isLoading = false;
if (onFinished != null) onFinished();
}
return ended;
}

58
lib/pages/fcs_shipment/fcs_shipment_list.dart
View File

@@ -1,13 +1,13 @@
import 'package:fcs/helpers/paginator.dart';
import 'package:fcs/helpers/theme.dart';
import 'package:fcs/localization/app_translations.dart';
import 'package:fcs/pages/fcs_shipment/model/fcs_shipment_model.dart';
import 'package:fcs/pages/widgets/bottom_up_page_route.dart';
import 'package:fcs/pages/widgets/local_popup_menu_button.dart';
import 'package:fcs/pages/widgets/local_popupmenu.dart';
import 'package:fcs/pages/widgets/local_text.dart';
import 'package:fcs/pages/widgets/progress.dart';
import 'package:flutter/cupertino.dart';
import 'package:provider/provider.dart';
import 'package:flutter/material.dart';
import 'package:provider/provider.dart';
import 'fcs_shipment_editor.dart';
import 'fcs_shipment_list_row.dart';
@@ -19,21 +19,39 @@ class FcsShipmentList extends StatefulWidget {
class _FcsShipmentListState extends State<FcsShipmentList> {
bool _isLoading = false;
var _controller = ScrollController();
@override
void initState() {
super.initState();
}
@override
void dispose() {
super.dispose();
_controller.addListener(() async {
if (_controller.position.pixels == _controller.position.maxScrollExtent) {
Provider.of<FcsShipmentModel>(context, listen: false).loadMore();
}
});
}
@override
Widget build(BuildContext context) {
var shipmentModel = Provider.of<FcsShipmentModel>(context);
final popupMenu = LocalPopupMenuButton(
popmenus: [
LocalPopupMenu(
id: 1,
textKey: "package.popupmenu.active",
selected: shipmentModel.selectedIndex == 1),
LocalPopupMenu(
id: 2,
textKey: "package.popupmenu.delivered",
selected: shipmentModel.selectedIndex == 2)
],
popupMenuCallback: (p) => this.setState(() {
shipmentModel.selectedIndex = p.id;
}),
);
return LocalProgress(
inAsyncCall: _isLoading,
child: Scaffold(
@@ -46,6 +64,7 @@ class _FcsShipmentListState extends State<FcsShipmentList> {
backgroundColor: primaryColor,
title: LocalText(context, 'FCSshipment.list.title',
color: Colors.white, fontSize: 20),
actions: [popupMenu],
),
floatingActionButton: FloatingActionButton.extended(
onPressed: () {
@@ -58,7 +77,10 @@ class _FcsShipmentListState extends State<FcsShipmentList> {
body: Column(
children: <Widget>[
Expanded(
child: new ListView.separated(
child: RefreshIndicator(
child: ListView.separated(
physics: AlwaysScrollableScrollPhysics(),
controller: _controller,
separatorBuilder: (context, index) => Divider(
color: Colors.black,
),
@@ -68,10 +90,26 @@ class _FcsShipmentListState extends State<FcsShipmentList> {
itemCount: shipmentModel.fcsShipments.length,
itemBuilder: (BuildContext context, int index) {
return FcsShipmentListRow(
key: ValueKey(shipmentModel.fcsShipments[index].id),
key: ValueKey(
shipmentModel.fcsShipments[index].id),
shipment: shipmentModel.fcsShipments[index]);
}),
onRefresh: () => shipmentModel.refresh(),
),
),
shipmentModel.isLoading
? Container(
padding: EdgeInsets.all(8),
color: primaryColor,
child: Row(
mainAxisAlignment: MainAxisAlignment.center,
children: [
Text("Loading...",
style: TextStyle(color: Colors.white)),
],
),
)
: Container(),
],
)));
}

58
lib/pages/fcs_shipment/model/fcs_shipment_model.dart
View File

@@ -4,6 +4,7 @@ import 'package:cloud_firestore/cloud_firestore.dart';
import 'package:fcs/data/services/services.dart';
import 'package:fcs/domain/constants.dart';
import 'package:fcs/domain/entities/fcs_shipment.dart';
import 'package:fcs/helpers/paginator.dart';
import 'package:fcs/pages/main/model/base_model.dart';
import 'package:logging/logging.dart';
@@ -11,27 +12,43 @@ class FcsShipmentModel extends BaseModel {
final log = Logger('FcsShipmentModel');
StreamSubscription<QuerySnapshot> listener;
List<FcsShipment> fcsShipments = [];
List<FcsShipment> _fcsShipments = [];
List<FcsShipment> get fcsShipments => _selectedIndex == 1
? _fcsShipments
: List<FcsShipment>.from(_delivered.values);
Paginator _delivered;
bool isLoading = false;
int _selectedIndex = 1;
set selectedIndex(int index) {
_selectedIndex = index;
notifyListeners();
}
get selectedIndex => _selectedIndex;
@override
void privilegeChanged() {
super.privilegeChanged();
_loadFcsShipments();
if (_delivered != null) _delivered.close();
_delivered = _getDelivered();
}
Future<void> _loadFcsShipments() async {
if (user == null || !user.hasFcsShipments()) return;
String path = "/$fcs_shipment_collection/";
if (listener != null) listener.cancel();
fcsShipments = [];
_fcsShipments = [];
try {
listener = Firestore.instance
.collection("$path")
.orderBy("shipment_number", descending: true)
.snapshots()
.listen((QuerySnapshot snapshot) {
fcsShipments.clear();
fcsShipments = snapshot.documents.map((documentSnapshot) {
_fcsShipments.clear();
_fcsShipments = snapshot.documents.map((documentSnapshot) {
var s = FcsShipment.fromMap(
documentSnapshot.data, documentSnapshot.documentID);
return s;
@@ -43,6 +60,36 @@ class FcsShipmentModel extends BaseModel {
}
}
Paginator _getDelivered() {
if (user == null || !user.hasFcsShipments()) return null;
var pageQuery = Firestore.instance
.collection("/$fcs_shipment_collection")
.where("is_delivered", isEqualTo: true)
.where("is_deleted", isEqualTo: false)
.orderBy("current_status_date", descending: true);
var paginator = new Paginator(pageQuery, rowPerLoad: 20, toObj: (data, id) {
return FcsShipment.fromMap(data, id);
});
return paginator;
}
Future<void> loadMore() async {
if (_delivered.ended) return;
isLoading = true;
notifyListeners();
await _delivered.load(onFinished: () {
isLoading = false;
notifyListeners();
});
}
Future<void> refresh() async {
await _delivered.refresh(onFinished: () {
notifyListeners();
});
}
void initUser(user) {
super.initUser(user);
}
@@ -50,7 +97,8 @@ class FcsShipmentModel extends BaseModel {
@override
logout() async {
if (listener != null) await listener.cancel();
fcsShipments = [];
if (_delivered != null) _delivered.close();
_fcsShipments = [];
}
Future<void> create(FcsShipment fcsShipment) {

144
lib/pages/package/model/package_model.dart
View File

@@ -1,102 +1,132 @@
import 'dart:async';
import 'dart:io';
import 'package:fcs/data/services/services.dart';
import 'package:fcs/domain/vo/delivery_address.dart';
import 'package:fcs/domain/vo/message.dart';
import 'package:fcs/helpers/pagination.dart';
import 'package:path/path.dart' as Path;
import 'package:cloud_firestore/cloud_firestore.dart';
import 'package:fcs/data/services/services.dart';
import 'package:fcs/domain/constants.dart';
import 'package:fcs/domain/entities/package.dart';
import 'package:fcs/domain/entities/user.dart';
import 'package:fcs/domain/vo/delivery_address.dart';
import 'package:fcs/domain/vo/message.dart';
import 'package:fcs/helpers/firebase_helper.dart';
import 'package:fcs/helpers/paginator.dart';
import 'package:fcs/pages/main/model/base_model.dart';
import 'package:logging/logging.dart';
import 'package:path/path.dart' as Path;
class PackageModel extends BaseModel {
final log = Logger('PackageModel');
StreamSubscription<QuerySnapshot> listener;
StreamSubscription<QuerySnapshot> customerPackageListener;
Pagination pagination;
List<Package> packages = [];
List<Package> customerPackages = [];
List<Package> deliveredPackages = [];
List<Package> get packages =>
_selectedIndex == 1 ? _packages : List<Package>.from(_delivered.values);
List<Package> get customerPackages => _selectedIndex == 1
? _customerPackages
: List<Package>.from(_customerDelivered.values);
bool endOfDeliveredPackages = false;
List<Package> _packages = [];
List<Package> _customerPackages = [];
Paginator _delivered;
Paginator _customerDelivered;
bool isLoading = false;
bool isPackagesEnded = false;
bool isCustomerPackagesEnded = false;
int _selectedIndex = 1;
set selectedIndex(int index) {
_selectedIndex = index;
notifyListeners();
}
get selectedIndex => _selectedIndex;
@override
void privilegeChanged() {
super.privilegeChanged();
_loadPackages();
_loadCustomerPackages();
if (_delivered != null) _delivered.close();
_delivered = _getDeliveredExample(false);
loadMore(isCustomer: false);
if (_customerDelivered != null) _customerDelivered.close();
_customerDelivered = _getDeliveredExample(false);
loadMore(isCustomer: true);
}
@override
logout() async {
if (_delivered != null) _delivered.close();
if (_customerDelivered != null) _customerDelivered.close();
if (listener != null) await listener.cancel();
if (customerPackageListener != null) await customerPackageListener.cancel();
if (pagination != null) pagination.close();
packages = [];
customerPackages = [];
deliveredPackages = [];
_packages = [];
_customerPackages = [];
}
Future<void> initDeliveredPackages(bool onlyFcs) {
if (onlyFcs) {
Future<void> loadMore({bool isCustomer}) async {
if (selectedIndex == 1)
return; // when delivered menu is not selected return
var p = isCustomer ? _customerDelivered : _delivered;
if (p.ended) return;
isLoading = true;
notifyListeners();
await p.load(onFinished: () {
isLoading = false;
notifyListeners();
});
}
Future<void> refresh({bool isCustomer}) async {
if (selectedIndex == 1)
return; // when delivered menu is not selected return
var p = isCustomer ? _customerDelivered : _delivered;
await p.refresh(onFinished: () {
notifyListeners();
});
}
Paginator _getDelivered(bool isCustomer) {
if (!isCustomer) {
if (user == null ||
!((user.hasPackages() ||
user.hasReceiving() ||
user.hasProcessing()))) return null;
user.hasProcessing()))) throw "No privilege";
}
if (pagination != null) pagination.close();
deliveredPackages = [];
endOfDeliveredPackages = false;
isLoading = false;
var pageQuery = Firestore.instance
.collection("/$packages_collection")
// .collection(
// "/users/8OTfsbVvsUOn1SLxy1OrKk7Y_yNKkVoGalPcIlcHnAY/messages")
// .orderBy("date", descending: true);
.where("is_delivered", isEqualTo: true)
.where("is_deleted", isEqualTo: false);
if (!onlyFcs) {
if (isCustomer) {
pageQuery = pageQuery.where("user_id", isEqualTo: user.id);
}
pageQuery = pageQuery.orderBy("current_status_date", descending: true);
pagination = new Pagination(pageQuery, rowPerLoad: 20);
pagination.stream.listen((doc) {
if (doc == null) {
endOfDeliveredPackages = true;
} else {
deliveredPackages.add(Package.fromMap(doc.data, doc.documentID));
// var m = Message.fromMap(doc.data, doc.documentID);
// deliveredPackages.add(Package(
// id: m.id,
// status: package_delivered_status,
// currentStatus: package_delivered_status,
// currentStatusDate: m.date,
// trackingID: (count++).toString(),
// market: m.message));
}
var paginator = new Paginator(pageQuery, rowPerLoad: 20, toObj: (data, id) {
return Package.fromMap(data, id);
});
return null;
return paginator;
}
Future<bool> loadMoreDeliveredPackages() {
if (pagination != null && !isLoading && !endOfDeliveredPackages) {
isLoading = true;
notifyListeners();
pagination.load().then((value) {
isLoading = false;
notifyListeners();
int count = 0;
Paginator _getDeliveredExample(bool onlyFcs) {
count = 1;
var pageQuery = Firestore.instance
.collection(
"/users/8OTfsbVvsUOn1SLxy1OrKk7Y_yNKkVoGalPcIlcHnAY/messages")
.orderBy("date", descending: true);
var paginator = new Paginator(pageQuery, rowPerLoad: 20, toObj: (data, id) {
var m = Message.fromMap(data, id);
return Package(
id: m.id,
status: package_delivered_status,
currentStatus: package_delivered_status,
currentStatusDate: m.date,
trackingID: (count++).toString(),
market: m.message);
});
}
return null;
return paginator;
}
Future<void> _loadPackages() async {
@@ -105,7 +135,7 @@ class PackageModel extends BaseModel {
return;
String path = "/$packages_collection";
if (listener != null) listener.cancel();
packages = [];
_packages = [];
try {
var q = Firestore.instance
@@ -114,8 +144,8 @@ class PackageModel extends BaseModel {
.where("is_deleted", isEqualTo: false);
listener = q.snapshots().listen((QuerySnapshot snapshot) {
packages.clear();
packages = snapshot.documents.map((documentSnapshot) {
_packages.clear();
_packages = snapshot.documents.map((documentSnapshot) {
var package = Package.fromMap(
documentSnapshot.data, documentSnapshot.documentID);
return package;
@@ -131,7 +161,7 @@ class PackageModel extends BaseModel {
if (user == null) return;
String path = "/$packages_collection";
if (customerPackageListener != null) customerPackageListener.cancel();
customerPackages = [];
_customerPackages = [];
try {
var q = Firestore.instance
@@ -141,8 +171,8 @@ class PackageModel extends BaseModel {
.where("user_id", isEqualTo: user.id);
customerPackageListener = q.snapshots().listen((QuerySnapshot snapshot) {
customerPackages.clear();
customerPackages = snapshot.documents.map((documentSnapshot) {
_customerPackages.clear();
_customerPackages = snapshot.documents.map((documentSnapshot) {
var package = Package.fromMap(
documentSnapshot.data, documentSnapshot.documentID);
return package;

39
lib/pages/package/package_list.dart
View File

@@ -1,10 +1,10 @@
import 'package:fcs/domain/entities/package.dart';
import 'package:fcs/helpers/paginator.dart';
import 'package:fcs/helpers/theme.dart';
import 'package:fcs/pages/package/model/package_model.dart';
import 'package:fcs/pages/package/package_info.dart';
import 'package:fcs/pages/package/package_list_row.dart';
import 'package:fcs/pages/package_search/package_serach.dart';
import 'package:fcs/pages/widgets/bottom_up_page_route.dart';
import 'package:fcs/pages/widgets/local_popup_menu_button.dart';
import 'package:fcs/pages/widgets/local_popupmenu.dart';
import 'package:fcs/pages/widgets/local_text.dart';
@@ -23,43 +23,40 @@ class PackageList extends StatefulWidget {
class _PackageListState extends State<PackageList> {
bool _isLoading = false;
bool _showDelivered = false;
var _controller = ScrollController();
@override
void initState() {
super.initState();
_controller.addListener(() async {
if (_controller.position.pixels == _controller.position.maxScrollExtent) {
Provider.of<PackageModel>(context, listen: false)
.initDeliveredPackages(widget.onlyFcs);
_controller.addListener(() {
if (_showDelivered &&
_controller.position.pixels == _controller.position.maxScrollExtent) {
Provider.of<PackageModel>(context, listen: false)
.loadMoreDeliveredPackages();
.loadMore(isCustomer: !widget.onlyFcs);
}
});
}
@override
void dispose() {
super.dispose();
}
@override
Widget build(BuildContext context) {
var packageModel = Provider.of<PackageModel>(context);
bool onlyFcs = widget.onlyFcs;
var packages = _showDelivered
? packageModel.deliveredPackages
: onlyFcs ? packageModel.packages : packageModel.customerPackages;
var packages =
onlyFcs ? packageModel.packages : packageModel.customerPackages;
final popupMenu = LocalPopupMenuButton(
popmenus: [
LocalPopupMenu(
id: 1, textKey: "package.popupmenu.active", selected: true),
LocalPopupMenu(id: 2, textKey: "package.popupmenu.delivered")
id: 1,
textKey: "package.popupmenu.active",
selected: packageModel.selectedIndex == 1),
LocalPopupMenu(
id: 2,
textKey: "package.popupmenu.delivered",
selected: packageModel.selectedIndex == 2)
],
popupMenuCallback: (p) => this.setState(() {
_showDelivered = p.id == 2;
packageModel.selectedIndex = p.id;
}),
);
@@ -97,6 +94,7 @@ class _PackageListState extends State<PackageList> {
body: Column(
children: [
Expanded(
child: RefreshIndicator(
child: ListView.separated(
controller: _controller,
separatorBuilder: (context, index) => Divider(
@@ -112,6 +110,9 @@ class _PackageListState extends State<PackageList> {
package: packages[index],
);
}),
onRefresh: () =>
packageModel.refresh(isCustomer: !widget.onlyFcs),
),
),
packageModel.isLoading
? Container(