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item_list_page.dart
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item_list_page.dart
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import 'package:beamer/beamer.dart';
import 'package:flutter/cupertino.dart';
import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:flutter_bloc/flutter_bloc.dart';
import 'package:flutter_shopping_app/constant/enum.dart';
import 'package:flutter_shopping_app/helper/responsive_helper.dart';
import 'package:flutter_shopping_app/ui/common/base/app_wrapper.dart';
import 'package:flutter_shopping_app/ui/common/custom_paginator.dart';
import 'package:flutter_shopping_app/ui/common/item/bloc/product_item_cubit.dart';
import 'package:flutter_shopping_app/ui/common/item/item_card.dart';
import 'package:flutter_shopping_app/ui/common/item/item_loader.dart';
import 'package:get_it/get_it.dart';
class ItemListLocation extends BeamLocation {
ItemListLocation({BeamState state}) : super(state);
@override
List<String> get pathBlueprints => ['/trending', '/featured', '/topSelling'];
@override
List<BeamPage> buildPages(BuildContext context, BeamState state) {
final ITEM_TYPE _itemListType =
state.pathBlueprintSegments.contains('trending')
? ITEM_TYPE.trending
: state.pathBlueprintSegments.contains('featured')
? ITEM_TYPE.featured
: ITEM_TYPE.topSelling;
return [
BeamPage(
key: ValueKey('item-${describeEnum(_itemListType)}'),
title: 'Items',
child: ItemListPage(_itemListType),
)
];
}
}
class ItemListPage extends StatelessWidget {
final ITEM_TYPE type;
const ItemListPage(this.type, {Key key}) : super(key: key);
@override
Widget build(BuildContext context) {
return Container(
color: Colors.white,
child: SafeArea(
child: Scaffold(
appBar: AppBar(
centerTitle: false,
title: Text(describeEnum(type)),
leading: IconButton(
icon: Icon(Icons.arrow_back_ios),
onPressed: () => _goBack(context),
),
elevation: 0),
body: BlocProvider<ProductItemCubit>(
create: (context) =>
GetIt.I.get<ProductItemCubit>()..loadProducts(type: type),
child: AppWrapper(child: _ItemListPage(type)))),
),
);
}
_goBack(BuildContext context) {
if (context.canBeamBack) {
context.beamBack();
} else {
context.beamToNamed('/');
}
}
}
class _ItemListPage extends StatefulWidget {
final ITEM_TYPE type;
const _ItemListPage(this.type, {Key key}) : super(key: key);
@override
_ItemListPageState createState() => _ItemListPageState();
}
class _ItemListPageState extends State<_ItemListPage> {
final int _pageOffset = 100;
ScrollController _controller;
ProductItemCubit _bloc;
@override
void initState() {
super.initState();
_controller = ScrollController()..addListener(_scrollListener);
_bloc = context.read<ProductItemCubit>();
}
@override
void dispose() {
_controller.dispose();
super.dispose();
}
_scrollListener() {
//load the next page only if we have reached the end of the list minus offset
//if we are not in loading state or error state
//and if the list have next data to be fetched
if (_controller.position.maxScrollExtent <=
_controller.offset + _pageOffset &&
!_bloc.state.loading &&
!_bloc.state.hasError &&
_bloc.state.pagedItem.hasNext) {
_loadProducts();
}
}
@override
Widget build(BuildContext context) {
final ResponsiveHelper _respHelper = ResponsiveHelper(context: context);
return BlocBuilder<ProductItemCubit, ProductItemState>(
builder: (context, state) {
if (!state.loading && state.hasNoData)
return EmptyCard(
responsiveHelper: _respHelper,
);
return Column(
crossAxisAlignment: CrossAxisAlignment.center,
children: [
Expanded(
child: GridView.builder(
padding: EdgeInsets.all(_respHelper.defaultGap),
// controller: _controller,
itemCount: state.hasError
? state.size + 1
: state.loading
? state.pagedItem.perPage
: state.size,
itemBuilder: (BuildContext context, int index) {
if (index >= state.size)
return ItemLoaderCard(
errorMsg: state.error,
retry: () => _retry(context),
responsiveHelper: _respHelper,
);
else
return ItemCard(
item: state.items[index],
responsiveHelper: _respHelper,
);
},
gridDelegate: SliverGridDelegateWithFixedCrossAxisCount(
childAspectRatio: _respHelper.isDesktop
? 1.1
: _respHelper.isTablet()
? 1
: 1.2,
crossAxisCount:
_getOptimalCrossAxisCount(context, _respHelper),
mainAxisSpacing: _respHelper.defaultSmallGap,
crossAxisSpacing: 0,
)),
),
CustomPaginator(
state.pagedItem,
onPageChanged: _onPageChanged,
disabled: state.loading,
),
],
);
});
}
_onPageChanged(int page) {
_loadProducts(page: page);
}
int _getOptimalCrossAxisCount(
BuildContext context, ResponsiveHelper _respHelper) {
return _respHelper.isDesktop
? 4
: _respHelper.isTablet()
? 3
: 2;
}
_loadProducts({page}) {
_bloc.loadProducts(type: widget.type, page: page, appendData: false);
}
_retry(BuildContext context) {
_loadProducts();
}
}