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Adding null safety #12

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259 changes: 117 additions & 142 deletions lib/screens/note_list.dart
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Original file line number Diff line number Diff line change
@@ -1,170 +1,145 @@
import 'dart:async';
import 'package:flutter/material.dart';
import 'package:flutter_app/models/note.dart';
import 'package:flutter_app/utils/database_helper.dart';
import 'package:flutter_app/screens/note_detail.dart';
import 'package:flutter_apps/models/note.dart';
import 'package:flutter_apps/utils/database_helper.dart';
import 'package:sqflite/sqflite.dart';

import 'note_detail.dart';

class NoteList extends StatefulWidget {

@override
State<StatefulWidget> createState() {

return NoteListState();
}
@override
_NoteListState createState() => _NoteListState();
}

class NoteListState extends State<NoteList> {
class _NoteListState extends State<NoteList> {
int count = 0;
DatabaseHelper databaseHelper = DatabaseHelper();
List<Note>? noteList;

DatabaseHelper databaseHelper = DatabaseHelper();
List<Note> noteList;
int count = 0;

@override
@override
Widget build(BuildContext context) {

if (noteList == null) {
noteList = List<Note>();
updateListView();
}
if (noteList == null) {
noteList = <Note>[];
updateListView();
print("Build");
}

return Scaffold(

appBar: AppBar(
title: Text('Notes'),
),

body: getNoteListView(),

floatingActionButton: FloatingActionButton(
onPressed: () {
debugPrint('FAB clicked');
navigateToDetail(Note('', '', 2), 'Add Note');
},

tooltip: 'Add Note',

child: Icon(Icons.add),

),
appBar: AppBar(
title: Text('Notes'),
),
body: getNoteListView(),
floatingActionButton: FloatingActionButton(
onPressed: () {
print("FAB clicked");
navigateToDetail(Note('', '', 2), 'Add Note');
},
tooltip: 'Add Note',
child: Icon(Icons.add),
),
);
}

ListView getNoteListView() {

TextStyle titleStyle = Theme.of(context).textTheme.subhead;

return ListView.builder(
itemCount: count,
itemBuilder: (BuildContext context, int position) {
return Card(
color: Colors.white,
elevation: 2.0,
child: ListTile(

leading: CircleAvatar(
backgroundColor: getPriorityColor(this.noteList[position].priority),
child: getPriorityIcon(this.noteList[position].priority),
),

title: Text(this.noteList[position].title, style: titleStyle,),

subtitle: Text(this.noteList[position].date),

trailing: GestureDetector(
child: Icon(Icons.delete, color: Colors.grey,),
onTap: () {
_delete(context, noteList[position]);
},
),


onTap: () {
debugPrint("ListTile Tapped");
navigateToDetail(this.noteList[position],'Edit Note');
},

),
);
},
);
TextStyle? titleStyle = Theme.of(context).textTheme.subtitle1;

return ListView.builder(
itemCount: count,
itemBuilder: (BuildContext context, int position) {
return Card(
color: Colors.white,
elevation: 2.0,
child: ListTile(
leading: CircleAvatar(
backgroundColor:
getPriorityColor(this.noteList![position].priority!),
child: getPriorityIcon(this.noteList![position].priority!),
),
title: Text(
this.noteList![position].title!,
style: titleStyle,
),
subtitle: Text(this.noteList![position].date!),
trailing: GestureDetector(
child: Icon(
Icons.delete,
color: Colors.grey,
),
onTap: () {
_delete(context, noteList![position]);
},
),
onTap: () {
print("ListTile Tapped");
navigateToDetail(this.noteList![position], 'Edit Note');
},
),
);
},
);
}

// Returns the priority color
Color getPriorityColor(int priority) {
switch (priority) {
case 1:
return Colors.red;
break;
case 2:
return Colors.yellow;
break;

default:
return Colors.yellow;
}
}

// Returns the priority icon
Icon getPriorityIcon(int priority) {
switch (priority) {
case 1:
return Icon(Icons.play_arrow);
break;
case 2:
return Icon(Icons.keyboard_arrow_right);
break;

default:
return Icon(Icons.keyboard_arrow_right);
}
}

void _delete(BuildContext context, Note note) async {
// Colors according to the priority
Color getPriorityColor(int priority) {
switch (priority) {
case 1:
return Colors.red;
case 2:
return Colors.yellow;
default:
return Colors.yellow;
}
}

int result = await databaseHelper.deleteNote(note.id);
if (result != 0) {
_showSnackBar(context, 'Note Deleted Successfully');
updateListView();
}
}
// Icon according to the priority
Icon getPriorityIcon(int priority) {
switch (priority) {
case 1:
return Icon(Icons.play_arrow);
case 2:
return Icon(Icons.keyboard_arrow_right);
default:
return Icon(Icons.keyboard_arrow_right);
}
}

void _showSnackBar(BuildContext context, String message) {
void _delete(BuildContext context, Note note) async {
int result = await databaseHelper.deleteNote(note.id!);
if (result != 0) {
_showSnackBar(context, 'Note Deleted Successfully!');
updateListView();
}
}

final snackBar = SnackBar(content: Text(message));
Scaffold.of(context).showSnackBar(snackBar);
}
void _showSnackBar(BuildContext context, String message) {
final snackBar = SnackBar(content: Text(message));
ScaffoldMessenger.of(context).showSnackBar(snackBar);
}

void navigateToDetail(Note note, String title) async {
bool result = await Navigator.push(context, MaterialPageRoute(builder: (context) {
return NoteDetail(note, title);
}));
bool result = await Navigator.push(
context,
MaterialPageRoute(
builder: (context) {
return NoteDetail(note, title);
},
),
);

if (result == true) {
updateListView();
}
if (result == true) {
updateListView();
}
}

void updateListView() {

final Future<Database> dbFuture = databaseHelper.initializeDatabase();
dbFuture.then((database) {

Future<List<Note>> noteListFuture = databaseHelper.getNoteList();
noteListFuture.then((noteList) {
setState(() {
this.noteList = noteList;
this.count = noteList.length;
});
});
});
final Future<Database> dbFuture = databaseHelper.initializeDatabase();
dbFuture.then((database) {
Future<List<Note>> noteListFuture = databaseHelper.getNoteList();
noteListFuture.then((noteList) {
setState(() {
this.noteList = noteList;
this.count = noteList.length;
});
});
});
}
}