Changing the Slider Height - flutter

Question

I've tried a lot, but I can't change the height of AlertDialog when I use Slider. I saw here on the Forum the suggestion to use ConstrainedBox. Did n't work. Is there a better way to show the Slider?
#override
Widget build(BuildContext context) {
return ConstrainedBox(
constraints: BoxConstraints(maxHeight: 100.0),
child: AlertDialog(
title: Text('Selecione a velocidade'),
content: Container(
child: Slider(
value: _fontSize,
label: _fontSize.round().toString(),
min: 20,
max: 200,
divisions: 18,
onChanged: (value) {
setState(() {
_fontSize = value;
});
},
),
),
actions: <Widget>[
FlatButton(
onPressed: () {
print('cancelar');
// Use the second argument of Navigator.pop(...) to pass
// back a result to the page that opened the dialog
Navigator.pop(context, _fontSize);
},
child: Text('Cancelar'),
),
FlatButton(
onPressed: () {
print('salvar');
// Use the second argument of Navigator.pop(...) to pass
// back a result to the page that opened the dialog
Navigator.pop(context, _fontSize);
},
child: Text('Salvar'),
),
FlatButton(
onPressed: () {
print('aplicar');
// Use the second argument of Navigator.pop(...) to pass
// back a result to the page that opened the dialog
Navigator.pop(context, _fontSize);
},
child: Text('Aplicar'),
),
],
),
);
}
I attached an image showing how AlertDialog looks.

Answer 1

You need to define the height for the Container which outside the Slider.
content: Container(
height:50, // define any height you want here
child: Slider(
This is how the output looked like.

Answer 2

Try this.
Dart pad to show your output
Let me know if it work out for you or not.
Code is here
#override
Widget build(BuildContext context) {
return FittedBox(
child: AlertDialog(
title: Text('Selecione a velocidade'),
content: Container(
child: Slider(
value: _fontSize,
label: _fontSize.round().toString(),
min: 20,
max: 200,
divisions: 18,
onChanged: (value) {
setState(() {
_fontSize = value;
});
},
),
),
actions: <Widget>[
FlatButton(
onPressed: () {
print('cancelar');
// Use the second argument of Navigator.pop(...) to pass
// back a result to the page that opened the dialog
Navigator.pop(context, _fontSize);
},
child: Text('Cancelar'),
),
FlatButton(
onPressed: () {
print('salvar');
// Use the second argument of Navigator.pop(...) to pass
// back a result to the page that opened the dialog
Navigator.pop(context, _fontSize);
},
child: Text('Salvar'),
),
FlatButton(
onPressed: () {
print('aplicar');
// Use the second argument of Navigator.pop(...) to pass
// back a result to the page that opened the dialog
Navigator.pop(context, _fontSize);
},
child: Text('Aplicar'),
),
],
),
);
}
}