fluffychat/lib/views/home_view_parts/contact_list.dart

import 'dart:async';

import 'package:adaptive_page_layout/adaptive_page_layout.dart';
import 'package:fluffychat/components/avatar.dart';
import 'package:fluffychat/components/default_app_bar_search_field.dart';
import 'package:fluffychat/components/list_items/contact_list_tile.dart';
import 'package:fluffychat/components/matrix.dart';
import 'package:flutter/material.dart';
import '../../utils/client_presence_extension.dart';
import 'package:flutter_gen/gen_l10n/l10n.dart';

class ContactList extends StatefulWidget {
  final Stream onAppBarButtonTap;

  const ContactList({Key key, this.onAppBarButtonTap}) : super(key: key);
  @override
  _ContactListState createState() => _ContactListState();
}

class _ContactListState extends State<ContactList> {
  String _searchQuery = '';
  final ScrollController _scrollController = ScrollController();
  StreamSubscription _onAppBarButtonTapSub;
  final GlobalKey<DefaultAppBarSearchFieldState> _searchField = GlobalKey();

  @override
  void initState() {
    _onAppBarButtonTapSub =
        widget.onAppBarButtonTap.where((i) => i == 0).listen((_) async {
      await _scrollController.animateTo(
        _scrollController.position.minScrollExtent,
        duration: Duration(milliseconds: 200),
        curve: Curves.ease,
      );
      WidgetsBinding.instance.addPostFrameCallback(
        (_) => _searchField.currentState.requestFocus(),
      );
    });
    super.initState();
  }

  @override
  void dispose() {
    _onAppBarButtonTapSub?.cancel();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return ListView(
      controller: _scrollController,
      children: [
        Padding(
          padding: EdgeInsets.all(12),
          child: DefaultAppBarSearchField(
            key: _searchField,
            hintText: L10n.of(context).search,
            prefixIcon: Icon(Icons.search_outlined),
            onChanged: (t) => setState(() => _searchQuery = t),
            padding: EdgeInsets.zero,
          ),
        ),
        ListTile(
          leading: CircleAvatar(
            backgroundColor: Theme.of(context).primaryColor,
            foregroundColor: Colors.white,
            child: Icon(Icons.add_outlined),
            radius: Avatar.defaultSize / 2,
          ),
          title: Text(L10n.of(context).addNewContact),
          onTap: () =>
              AdaptivePageLayout.of(context).pushNamed('/newprivatechat'),
        ),
        Divider(height: 1),
        StreamBuilder<Object>(
            stream: Matrix.of(context).client.onSync.stream,
            builder: (context, snapshot) {
              final contactList = Matrix.of(context)
                  .client
                  .contactList
                  .where((p) => p.senderId
                      .toLowerCase()
                      .contains(_searchQuery.toLowerCase()))
                  .toList();
              if (contactList.isEmpty) {
                return Container(
                  padding: EdgeInsets.all(16),
                  alignment: Alignment.center,
                  child: Text(
                    'No contacts found...',
                    textAlign: TextAlign.center,
                  ),
                );
              }
              return ListView.builder(
                physics: NeverScrollableScrollPhysics(),
                shrinkWrap: true,
                padding: EdgeInsets.only(bottom: 24),
                itemCount: contactList.length,
                itemBuilder: (context, i) =>
                    ContactListTile(contact: contactList[i]),
              );
            }),
      ],
    );
  }
}