Это будет работать отлично, проверьте это. Проверьте код ниже:
class HomeScreen extends StatelessWidget {
final String description =
"Flutter is Google’s mobile UI framework for crafting high-quality native interfaces on iOS and Android in record time. Flutter works with existing code, is used by developers and organizations around the world, and is free and open source.";
@override
Widget build(BuildContext context) {
return new Scaffold(
appBar: new AppBar(
title: const Text("Demo App"),
),
body: new Container(
child: new ExpandText(text: description),
),
);
}
}
class ExpandText extends StatefulWidget {
final String text;
ExpandText({@required this.text});
@override
_ExpandTextState createState() => new _ExpandTextState();
}
class _ExpandTextState extends State<ExpandText> {
String firstHalf;
String secondHalf;
bool flag = true;
@override
void initState() {
super.initState();
if (widget.text.length > 50) {
firstHalf = widget.text.substring(0, 50);
secondHalf = widget.text.substring(50, widget.text.length);
} else {
firstHalf = widget.text;
secondHalf = "";
}
}
@override
Widget build(BuildContext context) {
return new Container(
padding: new EdgeInsets.symmetric(horizontal: 10.0, vertical: 10.0),
child: secondHalf.isEmpty
? new Text(firstHalf)
: new Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
new Text(flag ? (firstHalf + "...") : (firstHalf + secondHalf)),
new InkWell(
child: new Row(
mainAxisAlignment: MainAxisAlignment.end,
children: <Widget>[
new Text(
flag ? "show more" : "show less",
style: new TextStyle(color: Colors.blue),
),
],
),
onTap: () {
setState(() {
flag = !flag;
});
},
),
],
),
);
}
}
Выход:
Надеюсь, это поможет.