tangheem/lib/widgets/auto_scroll_view/aya_scroll_view.dart

import 'package:flutter/material.dart';
import 'package:tangheem/widgets/auto_scroll_view/scroll_id.dart';

class AyaScrollViewer extends StatefulWidget {
  final ScrollToId scrollToId;
  final List<ScrollContent> children;
  final Axis scrollDirection;

  AyaScrollViewer({@required this.children, @required this.scrollToId, this.scrollDirection = Axis.vertical});

  @override
  _InteractiveScrollViewerState createState() => _InteractiveScrollViewerState();
}

class _InteractiveScrollViewerState extends State<AyaScrollViewer> {
  List<String> _idList = [];

  @override
  void initState() {
    super.initState();
    setData();
  }

  void setData() {
    widget.scrollToId.scrollDirection = widget.scrollDirection;
    _idList = [];
    widget.scrollToId.scrollContentsList = [];
    for (ScrollContent scrollContents in widget.children) {
      if (_idList.contains(scrollContents.id)) {
        throw Exception('Do not use the same id');
      } else {
        _idList.add(scrollContents.id);
      }
      widget.scrollToId.scrollContentsList.add(ScrollContentWithKey.fromWithout(scrollContents));
    }
  }

  @override
  void didUpdateWidget(covariant AyaScrollViewer oldWidget) {
    if (widget.children != oldWidget.children) {
      setData();
    }
    super.didUpdateWidget(oldWidget);
  }

  @override
  Widget build(BuildContext context) {
    return SingleChildScrollView(
      scrollDirection: widget.scrollDirection,
      controller: widget.scrollToId.scrollController,
      physics: BouncingScrollPhysics(),
      child: buildContent(),
    );
  }

  Widget buildContent() {
    if (widget.scrollDirection == Axis.vertical) {
      return Column(
        children: widget.scrollToId.scrollContentsList.map((scrollContents) {
          return buildRepaintBoundary(scrollContents);
        }).toList(),
      );
    } else {
      return Row(
        children: widget.scrollToId.scrollContentsList.map((scrollContents) {
          return buildRepaintBoundary(scrollContents);
        }).toList(),
      );
    }
  }

  RepaintBoundary buildRepaintBoundary(ScrollContentWithKey scrollContents) {
    return RepaintBoundary(
      key: scrollContents.key,
      child: scrollContents.child,
    );
  }
}