Envelope/mobile/lib/views/main/friend_list.dart

import 'package:flutter/material.dart';
import '/models/friends.dart';
import '/views/main/friend_list_item.dart';

class FriendList extends StatefulWidget {
  final List<Friend> friends;
  const FriendList({
    Key? key,
    required this.friends,
  }) : super(key: key);

  @override
  State<FriendList> createState() => _FriendListState();
}

class _FriendListState extends State<FriendList> {
  List<Friend> friends = [];
  List<Friend> friendsDuplicate = [];

  @override
  void initState() {
    super.initState();
    friends.addAll(widget.friends);
    setState(() {});
  }

  void filterSearchResults(String query) {
    List<Friend> dummySearchList = [];
    dummySearchList.addAll(widget.friends);

    if(query.isNotEmpty) {
      List<Friend> dummyListData = [];
      dummySearchList.forEach((item) {
        if(item.username.toLowerCase().contains(query)) {
          dummyListData.add(item);
        }
      });
      setState(() {
        friends.clear();
        friends.addAll(dummyListData);
      });
      return;
    }

    setState(() {
      friends.clear();
      friends.addAll(widget.friends);
    });
  }

  Widget list() {
    if (friends.isEmpty) {
      return const Center(
          child: Text('No Friends'),
      );
    }

    return ListView.builder(
        itemCount: friends.length,
        shrinkWrap: true,
        padding: const EdgeInsets.only(top: 16),
        physics: const NeverScrollableScrollPhysics(),
        itemBuilder: (context, i) {
          return FriendListItem(
              friend: friends[i],
          );
        },
    );
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
        body: SingleChildScrollView(
            physics: const BouncingScrollPhysics(),
            child: Column(
                crossAxisAlignment: CrossAxisAlignment.start,
                children: <Widget>[
                  SafeArea(
                      child: Padding(
                          padding: const EdgeInsets.only(left: 16,right: 16,top: 10),
                          child: Row(
                              mainAxisAlignment: MainAxisAlignment.spaceBetween,
                              children: <Widget>[
                                const Text("Friends",style: TextStyle(fontSize: 32,fontWeight: FontWeight.bold),),
                                Container(
                                    padding: const EdgeInsets.only(left: 8,right: 8,top: 2,bottom: 2),
                                    height: 30,
                                    decoration: BoxDecoration(
                                        borderRadius: BorderRadius.circular(20),
                                        color: Theme.of(context).colorScheme.tertiary
                                    ),
                                    child: Row(
                                        children: <Widget>[
                                          Icon(
                                              Icons.add,
                                              color: Theme.of(context).primaryColor,
                                              size: 20
                                          ),
                                          const SizedBox(width: 2,),
                                          const Text(
                                              "Add",
                                              style: TextStyle(
                                                  fontSize: 14,
                                                  fontWeight: FontWeight.bold
                                              )
                                          ),
                                        ],
                                    ),
                                )
                              ],
                          ),
                    ),
                ),
                Padding(
                    padding: const EdgeInsets.only(top: 16,left: 16,right: 16),
                    child: TextField(
                        decoration: const InputDecoration(
                                hintText: "Search...",
                                prefixIcon: Icon(
                                    Icons.search,
                                    size: 20
                                ),
                        ),
                        onChanged: (value) => filterSearchResults(value.toLowerCase())
                    ),
                ),
                Padding(
                        padding: const EdgeInsets.only(top: 16,left: 16,right: 16),
                        child: list(),
                ),
            ],
        ),
      ),
    );
  }
}