E2EEChat/lib/view/session.dart

import 'package:e2ee_chat/common/global.dart';
import 'package:e2ee_chat/presenter/session.dart';
import 'package:flutter/material.dart';
import 'package:flutter_slidable/flutter_slidable.dart';
import 'package:provider/provider.dart';

class SessionList extends StatefulWidget {
  @override
  _SessionListState createState() => _SessionListState();
}

class _SessionListState extends State<SessionList> {
  @override
  Widget build(BuildContext context) {
    return ChangeNotifierProvider<SessionListModel>(
      create: (context) {
        return SessionListModel();
      },
      child: Builder(
        builder: (context) {
          var provider = Provider.of<SessionListModel>(context);
          return ListView.builder(
              itemCount: provider.count,
              itemBuilder: (context, index) {
                var _item = provider.sessions[index];
                return Slidable(
                  actionPane: SlidableDrawerActionPane(),
                  actionExtentRatio: 0.25,
                  secondaryActions: <Widget>[
                    IconSlideAction(
                      caption: '取消置顶',
                      color: Colors.black45,
                      icon: Icons.more_horiz,
                      onTap: () {},
                    ),
                    IconSlideAction(
                      caption: '删除',
                      color: Colors.redAccent,
                      icon: Icons.delete,
                      onTap: () => {},
                    ),
                  ],
                  child: Padding(
                    padding: EdgeInsets.only(left: 36, bottom: 20, top: 20),
                    child: Row(
                      crossAxisAlignment: CrossAxisAlignment.start,
                      children: <Widget>[
                        Expanded(child: SessionItem(_item)),
                        _item.isStick
                            ? Container(
                                width: 40,
                                height: 48,
                                margin: EdgeInsets.only(top: 10, right: 10),
                                child: Icon(Icons.star))
                            : Padding(
                                padding: EdgeInsets.symmetric(horizontal: 24),
                              )
                      ],
                    ),
                  ),
                );
              });
        },
      ),
    );
  }
}

class SessionItem extends StatelessWidget {
  final SessionModel model;

  SessionItem(this.model);

  @override
  Widget build(BuildContext context) {
    final message = model.lastMessage;
    return Row(
      mainAxisAlignment: MainAxisAlignment.spaceBetween,
      children: <Widget>[
        model.avatar ?? Global.defaultAvatar,
        Expanded(
          child: Column(
            children: <Widget>[
              Padding(
                padding: EdgeInsets.symmetric(vertical: 8),
                child: Row(
                  mainAxisAlignment: MainAxisAlignment.spaceBetween,
                  children: <Widget>[
                    Expanded(
                      child: Text(
                        model.chatName,
                        style: TextStyle(fontSize: 34),
                        overflow: TextOverflow.ellipsis,
                      ),
                    ),
                    Text(
                      model.lastMessage != null ? _formatDate(model.lastMessage!.time) : "",
                      style: TextStyle(fontSize: 26),
                      overflow: TextOverflow.ellipsis,
                    ),
                  ],
                ),
              ),
              Row(
                mainAxisAlignment: MainAxisAlignment.spaceBetween,
                children: <Widget>[
                  Expanded(
                    child: RichText(
                      text: TextSpan(children: [
                        TextSpan(
                          text: model.isAtYou ? "[@你]" : "",
                          style: TextStyle(fontSize: 28),
                        ),
                        TextSpan(
                          text: model.isSpecialAttention ? "[特别关注]" : "",
                          style: TextStyle(fontSize: 28),
                        ),
                        TextSpan(
                          text: model.isAtAll ? "[@所有人]" : "",
                          style: TextStyle(fontSize: 28),
                        ),
                        TextSpan(
                          text: model.lastMessage?.content.target?.plaintext ?? "",
                          style: TextStyle(fontSize: 28),
                        )
                      ]),
                      overflow: TextOverflow.ellipsis,
                    ),
                  ),
                  (model.unReadCount > 0 && !model.isDND)
                      ? Container(
                          width: 32,
                          height: 32,
                          alignment: Alignment.center,
                          decoration: BoxDecoration(borderRadius: BorderRadius.circular(20)),
                          child: Text(
                            model.unReadCount.toString(),
                            style: TextStyle(color: Colors.white, fontSize: 26),
                          ))
                      : Container(),
                  model.isDND
                      ? Row(
                          children: <Widget>[
                            Icon(Icons.visibility_off),
                            model.unReadCount > 0
                                ? Icon(
                                    Icons.chat_bubble,
                                    color: Colors.red,
                                  ) // TODO: 小红点
                                : Container()
                          ],
                        )
                      : Container()
                ],
              )
            ],
          ),
        )
      ],
    );
  }

  String _formatDate(int time) {
    DateTime dateTime = DateTime.fromMillisecondsSinceEpoch(time);
    return "${dateTime.hour}:${dateTime.minute}";
  }
}