Flutter Search bar not displaying all the users - flutter

Question

I have been implementing a search bar in Flutter, which works as expected when searching according to usernames, but does not display all the users when it is empty.
It only displays all the users when typing something in the search bar and completely backspacing it. The following code snippet shows its implementation:
class UsersTable extends StatefulWidget {
List<User> users;
List<Library> posts;
UsersTable(
this.users,
this.posts, {
Key? key,
}) : super(key: key);
#override
State<UsersTable> createState() => _UsersTableState();
}
class _UsersTableState extends State<UsersTable> {
List<User> _foundUsers = [];
#override
initState() {
// at the beginning, all users are shown
Future.delayed(Duration.zero, () async {
_foundUsers = widget.users;
print(_foundUsers.length);
if (mounted) setState(() {});
});
super.initState();
}
// This function is called whenever the text field changes
void _runFilter(String enteredKeyword) {
List<User> results = [];
if (enteredKeyword.trim().isEmpty) {
// if the search field is empty or only contains white-space, we'll display all users
results = widget.users;
print("if filter length");
print(results.length);
} else {
results = widget.users
.where((user) => user.username
.toLowerCase()
.contains(enteredKeyword.toLowerCase()))
.toList();
// we use the toLowerCase() method to make it case-insensitive
}
// Refresh the UI
setState(() {
_foundUsers = results;
});
}
Widget body(BuildContext context, List<User> users, List<Library> posts) {
return SafeArea(
child: Material(
child: Container(
padding: const EdgeInsets.all(defaultPadding),
decoration: const BoxDecoration(
color: boxColor,
borderRadius: BorderRadius.all(Radius.circular(10)),
),
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
mainAxisSize: MainAxisSize.min,
children: [
const Align(
alignment: Alignment.center,
child: Text(
"Active Users",
//style: Theme.of(context).textTheme.subtitle1,
style: TextStyle(
color: Colors.white,
fontSize: 20,
decoration: TextDecoration.none),
)),
const SizedBox(
height: 30,
),
TextField(
style: const TextStyle(color: Colors.white),
onChanged: (value) => _runFilter(value),
decoration: const InputDecoration(
labelStyle: TextStyle(color: Colors.white38),
labelText: 'Search',
suffixIcon: Icon(Icons.search),
suffixIconColor: Colors.white),
),
const SizedBox(
height: 20,
),
// SizedBox(
//width: double.infinity,
// child: SingleChildScrollView(
Container(
child: DataTable(
columnSpacing: 7,
columns: const [
// DataColumn(
// label: Text(
// "First Name",
// style: TextStyle(color: Colors.white),
// ),
// ),
// DataColumn(
// label: Text(
// "Last Name",
// style: TextStyle(color: Colors.white),
// ),
// ),
DataColumn(
label: Text(
"Username",
textAlign: TextAlign.center,
style: TextStyle(color: Colors.white),
),
),
DataColumn(
label: Text(
"Email ID",
textAlign: TextAlign.center,
style: TextStyle(color: Colors.white),
),
),
// DataColumn(
// label: Text(
// "DOB",
// style: TextStyle(color: Colors.white),
// ),
// ),
DataColumn(
label: Text(
"Account\nType",
textAlign: TextAlign.center,
style: TextStyle(color: Colors.white),
),
),
DataColumn(
label: Text(
"Delete\nUser",
textAlign: TextAlign.center,
style: TextStyle(color: Colors.white),
),
),
DataColumn(
label: Text(
"View\nPosts",
textAlign: TextAlign.center,
style: TextStyle(color: Colors.white),
),
),
],
rows:
//_foundUsers.isNotEmpty?
_foundUsers
.map(
(user) => DataRow(
cells: <DataCell>[
// DataCell(Text(user.first_name,
// style: TextStyle(color: Colors.white))),
// DataCell(Text(user.last_name,
// style: TextStyle(color: Colors.white))),
DataCell(Text(user.username,
textAlign: TextAlign.center,
style: TextStyle(color: Colors.white))),
DataCell(Text(user.email,
style: TextStyle(color: Colors.white))),
// DataCell(Text(user.date_of_birth,
// style: TextStyle(color: Colors.white))),
DataCell(Text(user.account_type,
textAlign: TextAlign.center,
style: TextStyle(color: Colors.white))),
DataCell(
ElevatedButton(
style: ElevatedButton.styleFrom(
primary: Colors.purple,
padding: const EdgeInsets.symmetric(
horizontal: 15, vertical: 15),
textStyle: const TextStyle(
fontSize: 12,
fontWeight: FontWeight.bold),
shadowColor: Colors.grey,
),
onPressed: () {
// if (user.username
// .compareTo('hwumazijadmin48') !=
// 0) {
BlocProvider.of<AuthenticationBloc>(context)
.add(DeleteUser(
username: user.username));
// } else {
// const Text("Cannot Delete Admin");
// }
},
child: const Text('X'),
),
),
DataCell(
ElevatedButton(
style: ElevatedButton.styleFrom(
primary: Colors.purple,
padding: const EdgeInsets.symmetric(
horizontal: 15, vertical: 15),
textStyle: const TextStyle(
fontSize: 12,
fontWeight: FontWeight.bold),
shadowColor: Colors.grey,
),
onPressed: () {
List<Library> po = [];
int i = 0;
while (i < posts.length) {
if (posts[i]
.user
.compareTo(user.username) ==
0) {
po.add(posts[i]);
}
i++;
}
Navigator.push(
context,
MaterialPageRoute(
builder: (context) => PostsTable(po),
),
);
},
child: const Text('\u{1F441}'),
),
),
],
),
)
.toList()
//: []
),
),
// ),
],
),
)
//)
));
}
Am I missing something in the code?

Answer 1

move super.initState(); above and remove Future.delayed.
#override
initState() {
super.initState();
_foundUsers = widget.users;
}
no need to setState({}); because build method will trigger after initState. Also no need for mounted because we removed asyncoperation.