[英]onTap go to next list item (Flutter)
我有一個顯示列表的ListView.builder,當我點擊一個項目時,它會在下一頁顯示該項目的詳細信息(FlashcardDetailsPage)。
當我點擊FlashcardDetailsPage類中的IconButton時,我想顯示下一個列表項。 所以我希望這個按鈕跳到下一個列表項。 有任何想法嗎?
class FlashcardListView extends StatelessWidget {
@override
Widget build(BuildContext context) {
return ListView.builder(
itemCount: allFlashcards.length,
itemBuilder: (context, int index) {
return ListTile(
title: Text(allFlashcards[index].actReg),
subtitle: Text(allFlashcards[index].question),
onTap: () {
Navigator.push(
context,
MaterialPageRoute(
builder: (context) => FlashcardDetailPage(
flashcardToShow: allFlashcards[index]),
),
);
},
);
});
}
}
class FlashcardDetailPage extends StatefulWidget {
final Flashcard flashcardToShow;
FlashcardDetailPage({Key key, @required this.flashcardToShow})
: super(key: key);
@override
_FlashcardDetailPageState createState() => _FlashcardDetailPageState();
}
class _FlashcardDetailPageState extends State<FlashcardDetailPage> {
@override
Widget build(BuildContext context) {
return Scaffold(
backgroundColor: Color.fromRGBO(242, 242, 242, 1),
appBar: AppBar(
centerTitle: true,
title: Text(widget.flashcardToShow.actReg),
),
body: Column(
children: <Widget>[
Container(
child: Card(
margin: EdgeInsetsDirectional.fromSTEB(20, 20, 20, 0),
child: Center(
child: Text(
widget.flashcardToShow.question,
textAlign: TextAlign.center,
style: TextStyle(fontSize: 30),
),
)),
),
Container(
height: 100.0,
child: Row(
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
children: <Widget>[
IconButton(
icon: Icon(Icons.skip_next),
iconSize: 32.0,
),
],
),
),
],
),
);
}
}
你可以用顯示下一張卡的另一張屏幕替換屏幕:
IconButton(
icon: Icon(Icons.skip_next),
iconSiz: 32,
onTap: () {
int currentIndex = allFlashcards.indexOf(widget.flashcardToShow);
if (currentIndex >= allFlashcards.length) return;
var nextFlashcard = allFlashcards[currentIndex + 1];
Navigator.of(context).pushReplacement(MaterialPageRoute(
builder: (ctx) => FlashDetailsPage(flashcardToShow: nextFlashcard)
));
},
)
謝謝馬塞爾的方向! 我用你的邏輯方法。 為了避免每次按下按鈕都打開一個新頁面,我做了這個並且它正在工作:
void _skipFlashcard () {
setState(() {
int currentIndex = allFlashcards.indexOf(widget.flashcardToShow);
var nextFlashcard = allFlashcards[currentIndex + 1];
widget.flashcardToShow = nextFlashcard;
});
}
IconButton(
icon: Icon(Icons.skip_next),
iconSize: 32.0,
onPressed: _skipFlashcard,
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