This package encapsulates Sqflite Table defined by RowModel, it encapsulats all the CRUD operations
First we define the table Structure using Tabledef and Fieldefs
// It defines the table and fields that que repository creates // and manage CRUD operations // / //
table = TableDef(tableName: 'notes',
fields: [
FieldDef('id', DbType.integer, primaryKey: true, primaryKeyType: PrimaryKeyType.integer_auto_incremental),
FieldDef('title', DbType.text),
FieldDef('description', DbType.text),
FieldDef('priority', DbType.integer),
FieldDef('date', DbType.datetime)]
);After we define the RowModel
Must create the props and implement
class Note extends RowModel {
int get id => this['id'];
String get title => this['title'];
String get description => this['description'];
int get priority => this['priority'];
DateTime get date => this['date'];
set title(String newTitle) {
if (newTitle.length <= 255) {
this['title'] = newTitle;
}
}
set description(String newDescription) {
if (newDescription.length <= 255) {
this['description'] = newDescription;
}
}
set priority(int newPriority) {
if (newPriority >= 1 && newPriority <= 2) {
this['priority'] = newPriority;
}
}
set date(DateTime newDate) {
this['date'] = newDate;
}
Note(TableDef tableDef, [title, date, priority, description])
: super(tableDef) {
if (!loaded()) this.newRecord();
this['title'] = title;
this['description'] = description;
this['priority'] = priority;
this['date'] = date;
}
}At last we inherit from SqfRepository
class NoteRepository extends SqfRepository<Note> {
NoteRepository() : super();
Note addNew(String title, DateTime date, int priority, [String description]) {
Note newNote = Note(this.table, title, date, priority, description);
rows.add(newNote);
this.current = newNote;
return newNote;
}Define the table structure and when the class its instantiate, it creates the table
@override
getTableDefiniton() {
table = TableDef(tableName: 'notes', fields: [
FieldDef('id', DbType.integer,
primaryKey: true,
primaryKeyType: PrimaryKeyType.integer_auto_incremental),
FieldDef('title', DbType.text),
FieldDef('description', DbType.text),
FieldDef('priority', DbType.integer),
FieldDef('date', DbType.datetime)
]);
}
@override
Note getNewRow() {
return Note(table);
}
}Then we can use in widgets and sign for change notifications Code for list
class NoteListState extends NotifiableState<NoteList> {
NoteRepository noteRepo;
@override
void initState() {
noteRepo = NoteRepository();
noteRepo.addListener(this);
super.initState();
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text('Notes'),
),
body: getNoteListView(),
floatingActionButton: FloatingActionButton(
onPressed: () {
debugPrint('FAB clicked');
noteRepo.addNew('',DateTime.now(),2);
navigateToDetail('Add Note');
},
tooltip: 'Add Note',
child: Icon(Icons.add),
),
);
}
ListView getNoteListView() {
TextStyle titleStyle = Theme.of(context).textTheme.subhead;
return ListView.builder(
itemCount: noteRepo.rows.length,
itemBuilder: (BuildContext context, int position) {
return Card(
color: Colors.white,
elevation: 2.0,
child: ListTile(
leading: CircleAvatar(
backgroundColor:
getPriorityColor(noteRepo.rows[position]['priority']),
child: getPriorityIcon(noteRepo.rows[position]['priority']),
),
title: Text(
//noteRepo.rows[position]['title'] work's this way either
noteRepo.rows[position].title,
style: titleStyle,
),
subtitle: Text(DateFormat.yMMMMd().format(noteRepo.rows[position].date)),
trailing: GestureDetector(
child: Icon(
Icons.delete,
color: Colors.grey,
),
onTap: () {
_delete(context, noteRepo.rows[position]);
},
),
onTap: () {
debugPrint("ListTile Tapped");
noteRepo.setCurrent(noteRepo.rows[position]);
navigateToDetail('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 {
int result = await noteRepo.delete(note);
if (result == 1) {
_showSnackBar(context, 'Note Deleted Successfully');
}
}
void _showSnackBar(BuildContext context, String message) {
final snackBar = SnackBar(content: Text(message));
Scaffold.of(context).showSnackBar(snackBar);
}
void navigateToDetail(String title) async {
await Navigator.push(context, MaterialPageRoute(builder: (context) {
return NoteDetail(title);
}));
}
Code for detail
class NoteDetail extends StatefulWidget {
final String appBarTitle;
Note note;
NoteDetail(this.appBarTitle);
@override
NotifiableState<StatefulWidget> createState() {
return NoteDetailState(this.appBarTitle);
}
}
class NoteDetailState extends NotifiableState<NoteDetail> {
static var _priorities = ['High', 'Low'];
String appBarTitle;
Note note;
TextEditingController titleController = TextEditingController();
TextEditingController descriptionController = TextEditingController();
NoteDetailState(this.appBarTitle);
@override
void initState() {
note = Repository.of<NoteRepository>().current;
super.initState();
}
@override
Widget build(BuildContext context) {
TextStyle textStyle = Theme.of(context).textTheme.title;
titleController.text = note.title;
descriptionController.text = note.description;
return WillPopScope(
onWillPop: () {
// Write some code to control things, when user press Back navigation button in device navigationBar
moveToLastScreen();
},
child: Scaffold(
appBar: AppBar(
title: Text(appBarTitle),
leading: IconButton(
icon: Icon(Icons.arrow_back),
onPressed: () {
// Write some code to control things, when user press back button in AppBar
moveToLastScreen();
}),
),
body: Padding(
padding: EdgeInsets.only(top: 15.0, left: 10.0, right: 10.0),
child: ListView(
children: <Widget>[
// First element
ListTile(
title: DropdownButton(
items: _priorities.map((String dropDownStringItem) {
return DropdownMenuItem<String>(
value: dropDownStringItem,
child: Text(dropDownStringItem),
);
}).toList(),
style: textStyle,
value: getPriorityAsString(note.priority),
onChanged: (valueSelectedByUser) {
setState(() {
debugPrint('User selected $valueSelectedByUser');
updatePriorityAsInt(valueSelectedByUser);
});
}),
),
// Second Element
Padding(
padding: EdgeInsets.only(top: 15.0, bottom: 15.0),
child: TextField(
controller: titleController,
style: textStyle,
onChanged: (value) {
debugPrint('Something changed in Title Text Field');
updateTitle();
},
decoration: InputDecoration(
labelText: 'Title',
labelStyle: textStyle,
border: OutlineInputBorder(
borderRadius: BorderRadius.circular(5.0))),
),
),
// Third Element
Padding(
padding: EdgeInsets.only(top: 15.0, bottom: 15.0),
child: TextField(
controller: descriptionController,
style: textStyle,
onChanged: (value) {
debugPrint('Something changed in Description Text Field');
updateDescription();
},
decoration: InputDecoration(
labelText: 'Description',
labelStyle: textStyle,
border: OutlineInputBorder(
borderRadius: BorderRadius.circular(5.0))),
),
),
// Fourth Element
Padding(
padding: EdgeInsets.only(top: 15.0, bottom: 15.0),
child: Row(
children: <Widget>[
Expanded(
child: RaisedButton(
color: Theme.of(context).primaryColorDark,
textColor: Theme.of(context).primaryColorLight,
child: Text(
'Save',
textScaleFactor: 1.5,
),
onPressed: () {
debugPrint("Save button clicked");
_save();
},
),
),
Container(
width: 5.0,
),
Expanded(
child: RaisedButton(
color: Theme.of(context).primaryColorDark,
textColor: Theme.of(context).primaryColorLight,
child: Text(
'Delete',
textScaleFactor: 1.5,
),
onPressed: () {
debugPrint("Delete button clicked");
_delete();
},
),
),
],
),
),
],
),
),
));
}
void moveToLastScreen() {
Navigator.pop(context, true);
}
// Convert the String priority in the form of integer before saving it to Database
void updatePriorityAsInt(String value) {
switch (value) {
case 'High':
note.priority = 1;
break;
case 'Low':
note.priority = 2;
break;
}
}
// Convert int priority to String priority and display it to user in DropDown
String getPriorityAsString(int value) {
String priority;
switch (value) {
case 1:
priority = _priorities[0]; // 'High'
break;
case 2:
priority = _priorities[1]; // 'Low'
break;
}
return priority;
}
// Update the title of Note object
void updateTitle() {
note.title = titleController.text;
}
// Update the description of Note object
void updateDescription() {
note.description = descriptionController.text;
}
// Save data to database
void _save() async {
moveToLastScreen();
note.date = DateTime.now();
int result;
if (note.id != null) {
// Case 1: Update operation
result = await Repository.of<NoteRepository>().update(note);
} else {
// Case 2: Insert Operation
result = await Repository.of<NoteRepository>().insert(note);
}
if (result != 0) {
// Success
_showAlertDialog('Status', 'Note Saved Successfully');
} else {
// Failure
_showAlertDialog('Status', 'Problem Saving Note');
}
}
void _delete() async {
moveToLastScreen();
// Case 1: If user is trying to delete the NEW NOTE i.e. he has come to
// the detail page by pressing the FAB of NoteList page.
if (note.id == null) {
_showAlertDialog('Status', 'No Note was deleted');
return;
}
// Case 2: User is trying to delete the old note that already has a valid ID.
int result = await Repository.of<NoteRepository>().delete(note);
if (result != 0) {
_showAlertDialog('Status', 'Note Deleted Successfully');
} else {
_showAlertDialog('Status', 'Error Occured while Deleting Note');
}
}
void _showAlertDialog(String title, String message) {
AlertDialog alertDialog = AlertDialog(
title: Text(title),
content: Text(message),
);
showDialog(context: context, builder: (_) => alertDialog);
}
}