我正在尝试使用graphql_flutter插件从graphql api中获取数据，如果偏移量为0，则使用偏移量进行分页，如果偏移量增加1，它将获取前10个项目，因此当我使用graphql的fetchmore回调方法时，它会查询它再次调用我的构建器方法，它再次刷新我的列表，一旦用户滚动到最大位置，我不想要我想要的数据加载从那个位置它不应该重新加载我的列表并添加数据它只是将数据添加到我的列表下面是我的查询
我的构建方法代码
Widget build(BuildContext context) {
// TODO: implement build
MoengageFlutter.getInstance()
.trackEvent(StringConstants.loanListingScreen, null);
// Analytics().logCustomEvent(StringConstants.loanListingScreen, null);
// if (offset == 0) {
getLoanProducts =
"""query(\$offset: Int!, \$confKey: String!, \$operator: String!) {
user{
products(product_id: "",filter:[{
setting_type: "sort",
setting: [
{
conf_key: \$confKey,
operator: \$operator
},
]
}
], limit: 10, offset: \$offset) {
total
data{
id
name
loan_type
partner_id
internal_rating
playstore_rating
interest_rate_min
interest_rate_max
loan_amount_min
loan_amount_max
processing_fee_percentage
processing_fee_min
processing_fee_max
required_documents
duration_min
duration_max
duration_min_unit
duration_max_unit
app_url
partner {
id
name
logo
short_description
term_link
support_contact
support_email
}
}
}
}
}""";
// }
// productListingBloc.getProductListingBloc(getLoanProducts).then((value){
// print(value);
// });
return Query(
options: QueryOptions(document: gql(getLoanProducts), variables: {
"offset": offset,
"confKey": confKey,
"operator": _operator
}),
builder: (QueryResult result,
{VoidCallback refetch, FetchMore fetchMore}) {
if (result.hasException) {
return Container(
width: ResponsiveRenderer().widthOfItem(context),
child: UnknownErrorState(
errorImage: StringConstants.unknownErrorStateImage,
text: StringConstants.unknownErrorStateText,
titleText: StringConstants.unknownErrorOccurredText,
));
}
if (result.isLoading) {
return offset == 0
? Center(
child: CircularProgressIndicator(),
)
: Center(child: CircularProgressIndicator());
}
return Scaffold(
backgroundColor: Colors.white,
appBar: !_isAppBar
? AppBar(
automaticallyImplyLeading: false,
elevation: 0,
backgroundColor: HexColor(ColorConstants.white),
)
: AppBar(
automaticallyImplyLeading: false,
title: Container(
child: TextCustom(
text: StringConstants.loansText,
textAlign: TextAlign.left,
hexColor: ColorConstants.black,
fontSize: DimensionConstants.textSize18,
fontWeight: FontWeight.w500,
),
),
actions: [
InkWell(
onTap: () {
MoengageFlutter.getInstance().trackEvent(
StringConstants.sortButtonLoanListing, null);
Analytics().logCustomEvent(
StringConstants.sortButtonLoanListing, null);
showSortBottomSheet(refetch);
},
child: Container(
margin: EdgeInsets.only(
right: DimensionConstants.margin16,
top: DimensionConstants.margin12),
child: Row(
children: [
Container(
margin: EdgeInsets.only(
right: DimensionConstants.margin8),
child:
SvgPicture.asset("assets/loan/sort.svg"),
),
TextCustom(
text: StringConstants.sortText,
hexColor: ColorConstants.black,
fontSize: DimensionConstants.textSize14,
),
],
),
),
)
],
elevation: 0,
backgroundColor: Colors.white,
),
body: BlocBuilder<NetworkBloc, NetworkState>(
builder: (context, state) {
if (state is ConnectionFailure) {
return Center(
child: UnknownErrorState(
errorImage: StringConstants.noInternetStateImage,
titleText: StringConstants.noInternetStateText,
text: StringConstants.noInternetStateSubText,
),
);
}
ProductListing listData = ProductListing.fromJson(result.data);
if (listData.user.products == null ||
listData.user.products.data.length == 0) {
return Container(
child: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: [
Container(
child: Image.asset(
"assets/loan/loan_error_state.png",
width: ResponsiveRenderer().widthOfItem(context) *
0.8,
height:
ResponsiveRenderer().heightOfItem(context) *
0.4,
),
),
Container(
margin: EdgeInsets.only(
top: DimensionConstants.margin16),
child: TextCustom(
text: StringConstants.noLoansFoundText,
fontSize: DimensionConstants.textSize16,
fontWeight: FontWeight.w500,
),
),
Container(
margin: EdgeInsets.only(
top: DimensionConstants.margin16),
child: TextCustom(
text: StringConstants
.checkLocationAndPersonalDetails,
fontSize: DimensionConstants.textSize12,
hexColor: ColorConstants.greyDark,
),
),
InkWell(
onTap: () {
MoengageFlutter.getInstance().trackEvent(
StringConstants.editProfileButtonLoanListing,
null);
Analytics().logCustomEvent(
StringConstants.editProfileButtonLoanListing,
null);
Navigator.of(context)
.pushNamed(MyProfile.routeName,
arguments: MyProfile(
phoneNumber: null,
));
},
child: Container(
margin: EdgeInsets.only(
top: DimensionConstants.margin16),
child: TextCustom(
text: StringConstants.editProfileText,
fontSize: DimensionConstants.textSize14,
fontWeight: FontWeight.w500,
hexColor: ColorConstants.blue,
),
),
),
],
),
),
);
} else {
_scrollController
..addListener(() {
if (_scrollController.position.pixels ==
_scrollController.position.maxScrollExtent) {
if (total > current) {
offset++;
FetchMoreOptions opts = FetchMoreOptions(
variables: {
'offset': offset,
"confKey": confKey,
"operator": _operator
},
document: gql(getLoanProducts),
updateQuery:
(previousResultData, fetchMoreResultData) {
print(fetchMoreResultData);
final List<dynamic> repos = [
...previousResultData['user']['products']
['data'] as List<dynamic>,
...fetchMoreResultData['user']['products']
['data'] as List<dynamic>
];
fetchMoreResultData['user']['products']['data'] =
repos;
productList = repos;
return fetchMoreResultData;
},
);
fetchMore(opts);
}
}
});
current =
(offset * limit) + listData.user.products.data.length;
total = listData.user.products.total;
return Column(
children: [
// Container(
// margin: EdgeInsets.only(
// left: DimensionConstants.margin12,
// top: DimensionConstants.margin16),
// child: TextCustom(
// text: StringConstants.loanListingDescription,
// textAlign: TextAlign.left,
// fontSize: DimensionConstants.margin14,
// hexColor: ColorConstants.black,
// ),
// ),
// _sortAndFilter(),
Expanded(
child: ListView.builder(
controller: _scrollController,
shrinkWrap: true,
itemCount: listData.user.products.data.length,
itemBuilder: (context, index) {
return Container(
padding: EdgeInsets.only(
top: DimensionConstants.margin16,
bottom: DimensionConstants.margin16),
child: CardCustomLoanList(
listData: listData, index: index));
}),
),
],
);
}
}));
});
}```
here fetch more calling builder method again which is refreshing my whole list I don't want to refresh my whole list
Please anyone knows any better way to do this?
[1]: https://pub.dev/packages/graphql_flutter