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
  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(),
            ),
          ],
        ),
      ),
    );
  }

  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);
    });
  }

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

  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],
        );
      },
    );
  }
}