[Flutter] 메모 9

메모 삭제 기능

 

 

---

홈 페이지

 

[screens/home_page.dart]

import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:memo/model/memo.dart';
import 'write_page.dart';
import 'package:memo/repository/db_helper.dart';

class HomePage extends StatefulWidget {
  final String title;
  HomePage({Key key, this.title}) : super(key: key);

  @override
  _HomePageState createState() => _HomePageState();
}

class _HomePageState extends State<HomePage> {
  String deleteId = '';

  Future<String> _calculation = Future<String>.delayed(
    Duration(seconds: 2),
    () => 'Data Loaded',
  );

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Column(
        children: <Widget>[
          Padding(
            padding: EdgeInsets.only(left: 20, top: 40, bottom: 20),
            child: Container(
              child: Text(
                '메모',
                style: TextStyle(fontSize: 36, color: Colors.blue),
              ),
              alignment: Alignment.centerLeft,
            ),
          ),
          Expanded(
            child: memoBuilder(context),
          )
        ],
      ),
      floatingActionButton: FloatingActionButton.extended(
        onPressed: () {
          print('[+ 메모 추가 액션버튼] 클릭');
          Navigator.push(
              context, MaterialPageRoute(builder: (context) => WritePage()));
        },
        tooltip: '+',
        label: Text('메모 추가'),
        icon: Icon(Icons.add),
      ),
    );
  }

  Future<List<Memo>> loadMemo() async {
    DBHelper dbHelper = DBHelper();
    return await dbHelper.selectMemos();
  }

  Future<void> deleteMemo(String id) async {
    DBHelper dbHelper = DBHelper();
    return await dbHelper.deleteMemo(id);
  }

  void showAlertDialog(BuildContext context) async {
    await showDialog(
        context: context,
        barrierDismissible: false,
        builder: (BuildContext context) {
          return AlertDialog(
            title: Text('삭제 경고'),
            content: Text('정말 삭제하시겠습니까?\n삭제된 메모는 복구되지 않습니다.'),
            actions: [
              FlatButton(
                child: Text('삭제'),
                onPressed: () {
                  Navigator.pop(context, '삭제');
                  setState(() {
                    deleteMemo(deleteId);
                  });
                  deleteId = '';
                },
              ),
              FlatButton(
                child: Text('취소'),
                onPressed: () {
                  deleteId = '';
                  Navigator.pop(context, '취소');
                },
              )
            ],
          );
        });
  }

  Widget memoBuilder(BuildContext parentContext) {
    return FutureBuilder(
      builder: (context, snapshot) {
        if (!snapshot.hasData || snapshot.data.isEmpty) {
          return Center(
              child: Text(
            '지금 바로 "메모 추가" 버튼을 눌러\n 새 메모를 추가해보세요!',
            style: TextStyle(
              fontSize: 15,
              color: Colors.blueAccent,
            ),
            textAlign: TextAlign.center,
          ));
        } else {
          return ListView.builder(
            itemCount: snapshot.data.length,
            itemBuilder: (context, index) {
              Memo memo = snapshot.data[index];
              return InkWell(
                onTap: () {
                  print('탭 클릭');
                },
                onLongPress: () {
                  print('길게 누름');
                  print(memo.id);
                  deleteId = memo.id;
                  setState(() {
                    showAlertDialog(parentContext);
                  });
                },
                child: Container(
                  height: 90,
                  margin:
                      EdgeInsets.only(left: 20, top: 0, bottom: 15, right: 20),
                  padding:
                      EdgeInsets.only(left: 15, top: 10, bottom: 15, right: 15),
                  alignment: Alignment.center,
                  child: Column(
                    children: [
                      Container(
                        child: Text(
                          memo.title,
                          style: TextStyle(
                              fontSize: 20, fontWeight: FontWeight.w500),
                        ),
                        alignment: Alignment.topLeft,
                      ),
                      Container(
                        child: Text(
                          memo.text,
                          style: TextStyle(fontSize: 15),
                          textAlign: TextAlign.left,
                        ),
                        alignment: Alignment.topLeft,
                      ),
                      Container(
                        child: Text(
                          '최종 수정 시간 : ${memo.editedTime.split('.')[0]}',
                          style: TextStyle(fontSize: 12),
                        ),
                        alignment: Alignment.bottomRight,
                      ),
                    ],
                  ),
                  decoration: BoxDecoration(
                    color: Colors.white,
                    border: Border.all(color: Colors.blue, width: 1),
                    boxShadow: [BoxShadow(color: Colors.blue, blurRadius: 3)],
                    borderRadius: BorderRadius.circular(12),
                  ),
                ),
              );
            },
          );
        }
      },
      future: loadMemo(),
    );
  }
}