CODEWITHSUNDEEP
fluttervariablesdartflutter-pageview
Meggy
Meggy

Reputation: 1671

Flutter/Dart - Get index number of PageView.Builder for use in a Text Widget?

I've got a PageView.builder within a StatelessWidget. I need to get the current index number of the currently viewed page to appear in a text widget in my build.

Was hoping I could simply use currentIndex.toString() as a variable in the text widget but Android Studio underlines it in red and warns me of undefined name currentIndex. How can I get the correct variable?

 class StageBuilder extends StatelessWidget {
  final List<SpeakContent> speakcrafts;
  StageBuilder(this.speakcrafts);

  final PageController controller = PageController(initialPage: 0);

  @override
  Widget build(context) {
    return PageView.builder(
      controller: controller,
      itemCount: speakcrafts.length,
      itemBuilder: (context, int currentIndex) {
        return createViewItem(speakcrafts[currentIndex], context);
      },
    );
  }

  Widget createViewItem(SpeakContent speakcraft, BuildContext context) {
  
    return Container(
        child: Text(currentIndex.toString()),
     )     
  }
}

Upvotes: 0

Views: 2931

Answers (1)

JideGuru
JideGuru

Reputation: 7660

You need to pass the currentIndex into your createViewItem

 class StageBuilder extends StatelessWidget {
  final List<SpeakContent> speakcrafts;
  StageBuilder(this.speakcrafts);

  final PageController controller = PageController(initialPage: 0);

  @override
  Widget build(context) {
    return PageView.builder(
      controller: controller,
      itemCount: speakcrafts.length,
      itemBuilder: (context, int currentIndex) {
        return createViewItem(speakcrafts[currentIndex], context, currentIndex);
      },
    );
  }

  Widget createViewItem(SpeakContent speakcraft, BuildContext context, int currentIndex) {
  
    return Container(
        child: Text(currentIndex.toString()),
     );
  }
}

Upvotes: 1

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