I have a code that changes text when the button is clicked:
// New Game route
class NewGameRoute extends StatelessWidget {
const NewGameRoute({key});
@override
Widget build(BuildContext context) {
return const MaterialApp(
debugShowCheckedModeBanner: false,
title: 'New Game',
home: ListFromCSV1(),
);
}
}
class ListFromCSV1 extends StatefulWidget {
const ListFromCSV1({Key? key}) : super(key: key);
@override
_ListFromCSVState1 createState() => _ListFromCSVState1();
}
class _ListFromCSVState1 extends State<ListFromCSV1> {
List<List<dynamic>> _listData = [
[""]
];
int _listCount = 0;
bool _isFirstLoad = true;
@override
initState() {
_loadCSV();
}
// This function is only triggered at init, so we only load csv once
void _loadCSV() async {
String _rawData = await rootBundle.loadString("files/Text.csv");
_listData = const CsvToListConverter().convert(_rawData);
}
// This function is triggered when my button is pressed
void _nextCSV() {
setState(() {
_listData = _listData;
_listCount < _listData.length - 1
? _isFirstLoad ? _isFirstLoad = false
: _listCount
: _listCount;
});
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: const Text('New Game'),
),
body: Container(
height: MediaQuery
.of(context)
.size
.height,
decoration: BoxDecoration(
image: DecorationImage(
image: AssetImage('files/main.jpg'), fit: BoxFit.cover)),
child: Column(
mainAxisSize: MainAxisSize.min,
children: <Widget>[
// const SizedBox(height: 30),
ClipRRect(
borderRadius: BorderRadius.circular(4),
child: Stack(
children: <Widget>[
Positioned.fill(
child: Container(
decoration: const BoxDecoration(
image: DecorationImage(
image: AssetImage('files/sheet.jpg'),
fit: BoxFit.cover)),
),
),
Text(_listData[_listCount][0]),
],
),
),
// const SizedBox(height: 30),
ClipRRect(
borderRadius: BorderRadius.circular(4),
child: Row(
mainAxisAlignment: MainAxisAlignment.spaceAround,
children: [
TextButton(
style: TextButton.styleFrom(
padding: const EdgeInsets.all(16.0),
primary: Colors.white,
textStyle: const TextStyle(fontSize: 20),
),
// onPressed: () {},
onPressed: _nextCSV,
child: const Text('OK'),
),
TextButton(
style: TextButton.styleFrom(
padding: const EdgeInsets.all(16.0),
primary: Colors.white,
textStyle: const TextStyle(fontSize: 20),
),
onPressed: () {},
// onPressed: _nextCSV,
child: const Text('Hide'),
),
],
),
),
// const SizedBox(height: 30),
],
),
),
);
}
}
I need to do the same for pictures used as backgrounds. But there is a certain condition.
By default, my user should see the picture that is specified in the code:
image: AssetImage('files/main.jpg'), fit: BoxFit.cover)),
Next, my user must click on the OK button and there are two options: 2.1 If _listData_listCount is empty, then the picture does not change. 2.2. If _listData_listCount is not empty (for example, images/02.jpg), then the user should see this picture.
The path to the image my user sees should be saved so that the next time my user opens this app, he/she will see it.
Here is a small file for testing: FILE
Thanks in advance.
CodePudding user response：
i think you should add condition in the AssetImage like isListEmpty then it should be like this, and images/02.jpg in asset folder already. Use Shared Ppreferences to store that in local maybe
AssetImage( isListEmpty ? 'files/main.jpg' : 'images/02.jpg')
CodePudding user response：
Hope this helps.
class ListFromCSV extends StatefulWidget {
const ListFromCSV({Key? key}) : super(key: key);
@override
_ListFromCSVState createState() => _ListFromCSVState();
}
class _ListFromCSVState extends State<ListFromCSV> {
List<List<dynamic>> _listData = [
[""]
];
int _listCount = 0;
bool _isFirstLoad = true;
String assetPath = "assets/files/main.jpeg";
@override
void initState() {
_loadCSV();
}
// This function is only triggered at init, so we only load csv once
void _loadCSV() async {
String rawData = await rootBundle.loadString("assets/files/Text.csv");
_listData = const CsvToListConverter().convert(rawData);
assetPath = _listData[_listCount][1] == "" ? "assets/files/main.jpeg" : _listData[_listCount][1];
}
// This function is triggered when my button is pressed
void _nextCSV() {
setState(() {
_listData = _listData;
_listCount < _listData.length - 1
? _isFirstLoad
? _isFirstLoad = false
: _listCount
: _listCount;
assetPath = _listData[_listCount][1] == "" ? assetPath : _listData[_listCount][1];
});
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: const Text('New Game'),
),
body: Container(
height: MediaQuery.of(context).size.height,
decoration: BoxDecoration(
image: DecorationImage(
image: AssetImage("assets/files/sheet.jpeg"), fit: BoxFit.cover)),
child: Column(
mainAxisSize: MainAxisSize.min,
children: <Widget>[
// const SizedBox(height: 30),
ClipRRect(
borderRadius: BorderRadius.circular(4),
child: Stack(
children: <Widget>[
Positioned.fill(
child: Container(
decoration: BoxDecoration(
image: DecorationImage(
image: AssetImage(assetPath),
fit: BoxFit.cover)),
),
),
Text(_listData[_listCount][0]),
],
),
),
// const SizedBox(height: 30),
ClipRRect(
borderRadius: BorderRadius.circular(4),
child: Row(
mainAxisAlignment: MainAxisAlignment.spaceAround,
children: [
TextButton(
style: TextButton.styleFrom(
padding: const EdgeInsets.all(16.0),
primary: Colors.white,
textStyle: const TextStyle(fontSize: 20),
),
// onPressed: () {},
onPressed: _nextCSV,
child: const Text('OK'),
),
TextButton(
style: TextButton.styleFrom(
padding: const EdgeInsets.all(16.0),
primary: Colors.white,
textStyle: const TextStyle(fontSize: 20),
),
onPressed: () {},
// onPressed: _nextCSV,
child: const Text('Hide'),
),
],
),
),
// const SizedBox(height: 30),
],
),
),
);
}
}
Do not forget to add the images pubsec.yaml file and in CSV mention the correct path.