Flutter : Use function from another file in widget - flutter

Question

I'm using flutter and i'm completely a newbie with this framework. I'm trying to use the visibility widget to show and hide a Row.
I'm trying to use this widget when I declare the variable bool _isVisible = false in a stateful or stateless widget, but I have a problem when I want to show and hide the row() through a widget from another dart file. I don't know how to do it. To solve this problem i'm trying to create a dart file for create a function and variable bool _isVisible = false; so that all widgets can access but I am unable to use the bool variable and the function of this dart file in my widgets.
in this picture: ontap in the green circle i want the pink color all the row() with the rating and the button to be hidden.
A screenshot of the issue from my application
P.S: sorry for my english
This is the widget( AnimeMovieDialog ) with the rating section that i want to be hidden (or show) when user tap on the CardAnimeMovie widget.
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
#override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Tutorial by Woolha.com',
home: AnimeMovieDialog(),
debugShowCheckedModeBanner: false,
);
}
}
class AnimeMovieDialog extends StatefulWidget {
#override
_AnimeMovieDialogState createState() => _AnimeMovieDialogState();
}
class _AnimeMovieDialogState extends State<AnimeMovieDialog> {
double _rating = 1;
double count = 1;
bool _isVisible = true;
void _change() {
setState(() {
_isVisible = !_isVisible;
print("tap succes");
});
}
void _close() {
setState(() {
_isVisible = false;
});
}
#override
Widget build(BuildContext context) {
double width = MediaQuery.of(context).size.width;
double height = MediaQuery.of(context).size.height;
return SafeArea(
child: Visibility(
visible: _isVisible,
child: Stack(children: [
Container(
width: width,
height: height,
decoration: BoxDecoration(color: Color(0xffffff).withOpacity(0.6)),
),
Center(
child: SingleChildScrollView(
child: Container(
width: width / 1.05,
height: height / 1.2,
decoration: BoxDecoration(color: Color(0xff212529)),
child: Column(
children: [
Row(
children: [
Container(
width: width / 1.05,
height: 60,
decoration: BoxDecoration(color: Color(0xff212529)),
child: Row(
mainAxisAlignment: MainAxisAlignment.center,
children: [
Padding(
padding:
const EdgeInsets.fromLTRB(4.0, 5, 35, 0),
child: GestureDetector(
onTap: () {
_close();
},
child: Container(
width: 65,
height: 45,
color: Colors.blue,
child: Icon(Icons.clear,
color: Colors.white)),
),
),
Container(
width: width / 2,
height: height / 2,
child: TextField(
cursorColor: Colors.orange,
style: TextStyle(
color: Colors.white,
),
maxLines: 1,
decoration: InputDecoration(
enabledBorder: UnderlineInputBorder(
borderSide: BorderSide(
color: Colors.white)),
focusedBorder: UnderlineInputBorder(
borderSide: BorderSide(
color: Colors.orange)),
border: UnderlineInputBorder(
borderSide: BorderSide(
color: Colors.white)),
hintText: 'Rechercher',
hintStyle:
TextStyle(color: Colors.white),
)),
),
Padding(
padding:
const EdgeInsets.fromLTRB(15, 0, 8, 0),
child: Container(
child: Icon(Icons.search,
color: Colors.white)),
)
],
),
)
],
),
Row(
children: [
Container(
width: width / 1.05,
height: height / 1.5,
child: ListView(
children: [
CardAnimeMovie(),
CardAnimeMovie(),
CardAnimeMovie(),
CardAnimeMovie(),
CardAnimeMovie(),
CardAnimeMovie()
],
),
)
],
),
Row(children: [
Column(
children: [
Container(
width: width / 2,
height: height / 11.25,
color: null,
child: Row(
children: [
Padding(
padding: const EdgeInsets.fromLTRB(
25, 0, 0, 0),
child: GFRating(
onChanged: (value) {
setState(() {
_rating = value;
});
},
value: _rating,
size: 25,
color: Colors.orange,
borderColor: Colors.orange,
),
)
],
)),
],
),
Padding(
padding: const EdgeInsets.fromLTRB(35, 0, 8, 0),
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
crossAxisAlignment: CrossAxisAlignment.center,
children: [
Container(
width: width / 3,
height: height / 18,
decoration: BoxDecoration(
color: Colors.orange,
borderRadius: BorderRadius.only(
topLeft: Radius.circular(25.0),
topRight: Radius.circular(25.0),
bottomLeft: Radius.circular(25.0),
bottomRight: Radius.circular(25.0))),
child: TextButton(
style: TextButton.styleFrom(
primary: Colors.blue,
onSurface: Colors.red,
),
onPressed: null,
child: Text('Noter',
style: TextStyle(
color: Colors.white,
fontFamily: 'DBIcons',
fontSize: 17)),
),
),
],
),
)
])
],
)),
),
),
]),
),
);
}
}
This is the movie resume (green in the picture)
class CardAnimeMovie extends StatefulWidget {
#override
_CardAnimeMovieState createState() => _CardAnimeMovieState();
}
class _CardAnimeMovieState extends State<CardAnimeMovie> {
// bool _visible = false;
// void ratechange() {
// setState(() {
// _visible = !_visible;
// });
// }
#override
Widget build(BuildContext context) {
double width = MediaQuery.of(context).size.width;
double height = MediaQuery.of(context).size.height;
return Padding(
padding: const EdgeInsets.all(2.0),
child: GestureDetector(
onTap: () {
ratechange();
},
child: Container(
width: width / 5,
height: height / 3.2,
decoration: BoxDecoration(color: Color(0xff272824)),
child: Row(
children: [
Column(children: [
Container(
width: width / 2.1,
height: height / 3.2,
child: Image.network(
'https://image.noelshack.com/fichiers/2014/31/1406628082-btlbdfqiyaasamj.jpg',
fit: BoxFit.cover,
),
)
]),
Column(children: [
Container(
width: width / 2.15,
height: height / 3.2,
decoration: BoxDecoration(
border: Border(
bottom: BorderSide(color: Colors.white, width: 0.5),
),
),
child: Padding(
padding: const EdgeInsets.fromLTRB(15, 5, 0, 0),
child: Column(
crossAxisAlignment: CrossAxisAlignment.end,
mainAxisAlignment: MainAxisAlignment.start,
children: [
Row(
children: [
Text(
'Titre : oeuvre',
style: TextStyle(
color: Colors.white,
fontFamily: 'DBIcons',
fontSize: 18,
),
)
],
),
SizedBox(
height: 0.5,
),
Row(
children: [
Text(
'Auteur : XXXX',
style: TextStyle(
color: Colors.white,
fontFamily: 'DBIcons',
fontSize: 18,
),
)
],
),
SizedBox(height: 7),
Row(
children: [
Container(
width: width / 2.5,
height: height / 5,
child: Text(
"Résume : Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries,",
style: TextStyle(
color: Colors.white,
fontFamily: 'DBIcons',
fontSize: 18,
),
),
)
],
)
],
),
),
)
])
],
)),
),
);
}
}

Answer 1

You can give function to another dart file and with this you can invoke function in another dart file.
For example:
class AnotherWidget extends StatelessWidget{
final Function myFunction;
AnotherWidget ({this.myFunction});
#override
Widget build(BuildContext context) {
return FlatButton(onPressed: myFunction,....);
}