keep state inside SearchDelegate #43582
Description
I have FutureBuilder>>ListView widgets Inside @OverRide buildResults(BuildContext context) method. I navigate to a new screen on list view item tap. but when i pop from the new screen the future is called again. Also i have pagination in the main list view, so when the user tap on item 100 for ex. after popping from the new screen, the main listview it will rebuild from the beginning
class DataSearch extends SearchDelegate<String>{
@override
List<Widget> buildActions(BuildContext context) {
return [
IconButton(
icon: Icon(Icons.clear),
onPressed: () {
query = '';
})
];
}
@override
ThemeData appBarTheme(BuildContext context) {
final ThemeData theme = Theme.of(context);
return theme.copyWith(
inputDecorationTheme: InputDecorationTheme(
hintStyle: TextStyle(color: theme.primaryTextTheme.title.color)),
primaryColor: theme.primaryColor,
primaryIconTheme: theme.primaryIconTheme,
primaryColorBrightness: theme.primaryColorBrightness,
primaryTextTheme: theme.primaryTextTheme,
textTheme: theme.textTheme.copyWith(
title: theme.textTheme.title
.copyWith(color: theme.primaryTextTheme.title.color)));
}
@override
Widget buildLeading(BuildContext context) {
return IconButton(
icon: AnimatedIcon(
icon: AnimatedIcons.menu_arrow, progress: transitionAnimation),
onPressed: () {
close(context, null);
});
}
@override
Widget buildResults(BuildContext context) {
SearchProvider searchProvider =
Provider.of<SearchProvider>(context, listen: false);
return query.isEmpty == true ? Container() : FutureBuilder(
future: searchProvider.fetchData(query),
builder: (context, snapshot) {
switch (snapshot.connectionState) {
case ConnectionState.waiting:
return Center(
child: SpinKitHourGlass(
color: Colors.greenAccent,
));
break;
default:
if (snapshot.hasError) {
return Center(child: Text("Error: ${snapshot.error}"));
} else {
return Consumer<SearchProvider>(
builder: (context, provider, child) => ImageList(
models: snapshot.data,
isSearch: true,
),
);
}
}
});
}
@override
Widget buildSuggestions(BuildContext context) {
return Container();
}
}