Created
October 6, 2020 19:40
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Sample Flutter Likert
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import 'package:flutter/material.dart'; | |
void main() => runApp(MyApp()); | |
/// This is the main application widget. | |
class MyApp extends StatelessWidget { | |
static const String _title = 'Flutter Code Sample'; | |
@override | |
Widget build(BuildContext context) { | |
return MaterialApp( | |
title: _title, | |
home: Scaffold( | |
appBar: AppBar(title: const Text(_title)), | |
body: MyStatefulWidget(), | |
), | |
); | |
} | |
} | |
class LabeledRadio extends StatelessWidget { | |
const LabeledRadio({ | |
this.label, | |
this.padding, | |
this.groupValue, | |
this.value, | |
this.onChanged, | |
this.itemOrder, | |
}); | |
final String label; | |
final EdgeInsets padding; | |
final int groupValue; | |
final int value; | |
final Function onChanged; | |
final int itemOrder; | |
@override | |
Widget build(BuildContext context) { | |
return InkWell( | |
onTap: () { | |
if (value != groupValue) onChanged(value); | |
}, | |
child: CustomPaint( | |
painter: _LinePainter(itemOrder), | |
child: Padding( | |
padding: padding, | |
child: Row( | |
children: <Widget>[ | |
Radio<int>( | |
groupValue: groupValue, | |
value: value, | |
onChanged: (int newValue) { | |
onChanged(newValue); | |
}, | |
), | |
Text(label), | |
], | |
), | |
), | |
), | |
); | |
} | |
} | |
/// This is the stateful widget that the main application instantiates. | |
class MyStatefulWidget extends StatefulWidget { | |
MyStatefulWidget({Key key}) : super(key: key); | |
@override | |
_MyStatefulWidgetState createState() => _MyStatefulWidgetState(); | |
} | |
/// This is the private State class that goes with MyStatefulWidget. | |
class _MyStatefulWidgetState extends State<MyStatefulWidget> { | |
int _selectedVal = -1; | |
@override | |
Widget build(BuildContext context) { | |
return Scaffold( | |
body: Column( | |
mainAxisAlignment: MainAxisAlignment.center, | |
children: <LabeledRadio>[ | |
LabeledRadio( | |
label: 'Strongly Disagree', | |
padding: const EdgeInsets.symmetric(horizontal: 5.0), | |
value: 2, | |
groupValue: _selectedVal, | |
onChanged: (int newValue) { | |
setState(() { | |
_selectedVal = newValue; | |
}); | |
}, | |
itemOrder: _LinePainter.FIRST_ITEM, | |
), | |
LabeledRadio( | |
label: 'Disagree', | |
padding: const EdgeInsets.symmetric(horizontal: 5.0), | |
value: 3, | |
groupValue: _selectedVal, | |
onChanged: (int newValue) { | |
setState(() { | |
_selectedVal = newValue; | |
}); | |
}, | |
itemOrder: _LinePainter.MIDDLE_ITEM, | |
), | |
LabeledRadio( | |
label: 'Neutral', | |
padding: const EdgeInsets.symmetric(horizontal: 5.0), | |
value: 4, | |
groupValue: _selectedVal, | |
onChanged: (int newValue) { | |
setState(() { | |
_selectedVal = newValue; | |
}); | |
}, | |
itemOrder: _LinePainter.MIDDLE_ITEM, | |
), | |
LabeledRadio( | |
label: 'Agree', | |
padding: const EdgeInsets.symmetric(horizontal: 5.0), | |
value: 5, | |
groupValue: _selectedVal, | |
onChanged: (int newValue) { | |
setState(() { | |
_selectedVal = newValue; | |
}); | |
}, | |
itemOrder: _LinePainter.MIDDLE_ITEM, | |
), | |
LabeledRadio( | |
label: 'Strongly Agree', | |
padding: const EdgeInsets.symmetric(horizontal: 5.0), | |
value: 6, | |
groupValue: _selectedVal, | |
onChanged: (int newValue) { | |
setState(() { | |
_selectedVal = newValue; | |
}); | |
}, | |
itemOrder: _LinePainter.LAST_ITEM, | |
), | |
], | |
), | |
); | |
} | |
} | |
class _LinePainter extends CustomPainter { | |
static const FIRST_ITEM = -1; | |
static const MIDDLE_ITEM = 0; | |
static const LAST_ITEM = 1; | |
int buttonType; | |
_LinePainter(this.buttonType); | |
@override | |
void paint(Canvas canvas, Size size) { | |
final p = Paint() | |
..color = Colors.black | |
..strokeWidth = 2; | |
if (buttonType == MIDDLE_ITEM || buttonType == LAST_ITEM) { | |
canvas.drawLine(Offset(29, 0), Offset(29, (size.height / 2) - 9), p); | |
} | |
if (buttonType == FIRST_ITEM || buttonType == MIDDLE_ITEM) { | |
canvas.drawLine( | |
Offset(29, (size.height / 2) + 9), Offset(29, size.height), p); | |
} | |
} | |
@override | |
bool shouldRepaint(_LinePainter oldDelegate) => false; | |
} |
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