E2EEChat/lib/view/add_friend.dart

import 'package:dio/dio.dart';
import 'package:e2ee_chat/common/api.dart';
import 'package:e2ee_chat/common/global.dart';
import 'package:e2ee_chat/l10n/localization_intl.dart';
import 'package:e2ee_chat/presenter/login.dart';
import 'package:e2ee_chat/presenter/theme.dart';
import 'package:flutter/material.dart';
import 'package:provider/provider.dart';
import 'package:fluttertoast/fluttertoast.dart';

class AddFriendView extends StatefulWidget {
  @override
  _AddFriendViewState createState() => _AddFriendViewState();
}

class _AddFriendViewState extends State<AddFriendView> {
  TextEditingController _unameController = new TextEditingController();
  GlobalKey _formKey = new GlobalKey<FormState>();

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: Text(GmLocalizations.of(context).searchUser)),
      body: Padding(
        padding: const EdgeInsets.all(16.0),
        child: Form(
          key: _formKey,
          autovalidateMode: AutovalidateMode.always, // TODO: what is AutovalidateMode?
          child: Column(
            children: <Widget>[
              TextFormField(
                  controller: _unameController,
                  decoration: InputDecoration(
                    labelText: GmLocalizations.of(context).userName,
                    hintText: GmLocalizations.of(context).userNameOrEmail,
                    prefixIcon: Icon(Icons.search),
                  ),
                  validator: (v) {
                    return v!.trim().isNotEmpty ? null : GmLocalizations.of(context).userNameRequired;
                  }),
              Padding(
                padding: const EdgeInsets.only(top: 25),
                child: ConstrainedBox(
                  constraints: BoxConstraints.expand(height: 55.0),
                  child: ElevatedButton(
                    style: ButtonStyle(
                      //TODO: something wrong with text color
                      textStyle: MaterialStateProperty.all<TextStyle>(TextStyle(color: Colors.white)),
                    ),
                    onPressed: _findUser,
                    child: Text(GmLocalizations.of(context).search),
                  ),
                ),
              ),
            ],
          ),
        ),
      ),
    );
  }

  void _findUser() async {


    // 提交前，先验证各个表单字段是否合法
    if ((_formKey.currentState as FormState).validate()) {
      Fluttertoast.showToast(msg: GmLocalizations.of(context).loading);
      bool result = await Api().addFriend(_unameController.text);
      if (!result) {
        Fluttertoast.showToast(msg: "发送好友申请失败");
      } else {
        Fluttertoast.showToast(msg: "好友申请已发送");
      }
    }
    // TODO: get user details
  }
}