cake_wallet/lib/src/widgets/collapsible_standart_list.dart

import 'package:cake_wallet/src/widgets/standard_list.dart';
import 'package:flutter/material.dart';

class CollapsibleSectionList extends SectionStandardList {
  CollapsibleSectionList(
      {required BuildContext context,
        required int sectionCount,
        required int Function(int sectionIndex) itemCounter,
        required Widget Function(BuildContext context, int sectionIndex, int itemIndex) itemBuilder,
        Color? themeColor,
        Color? dividerThemeColor,
        Widget Function(BuildContext context, int sectionIndex)? sectionTitleBuilder,
        bool hasTopSeparator = false})
      : super(
          context: context,
          hasTopSeparator: hasTopSeparator,
          sectionCount: sectionCount,
          itemCounter: itemCounter,
          itemBuilder: itemBuilder,
          sectionTitleBuilder: sectionTitleBuilder,
          themeColor: themeColor,
          dividerThemeColor: dividerThemeColor);

  @override
  List<Widget> transform(
      bool hasTopSeparator,
      BuildContext context,
      int sectionCount,
      int Function(int sectionIndex) itemCounter,
      Widget Function(BuildContext context, int sectionIndex, int itemIndex) itemBuilder,
      Widget Function(BuildContext context, int sectionIndex)? sectionTitleBuilder,
      Color? themeColor,
      Color? dividerThemeColor) {
    final items = <Widget>[];

    for (var sectionIndex = 0; sectionIndex < sectionCount; sectionIndex++) {
      final itemCount = itemCounter(sectionIndex);

      items.add(Theme(
        data: ThemeData(
            textTheme: TextTheme(subtitle1: TextStyle(color: themeColor,fontFamily: 'Lato')),
            backgroundColor: dividerThemeColor,
            unselectedWidgetColor: themeColor,
            accentColor: themeColor)
            .copyWith(dividerColor: Colors.transparent),
        child: Padding(
          padding: const EdgeInsets.only(left: 24.0),
          child: ListTileTheme(
            contentPadding: EdgeInsets.only(right: 16,top:sectionIndex>0?26:0),
            child: ExpansionTile(
              title: sectionTitleBuilder == null
                  ? Container()
                  : Container(child: buildTitle(items, sectionIndex, context)),
              initiallyExpanded: true,
              children: buildSection(itemCount, items, sectionIndex, context),
            ),
          ),
        ),
      ));

    }

    items.add(StandardListSeparator(padding: EdgeInsets.only(left: 24)));
    return items;
  }

  @override
  Widget buildTitle(
      List<Widget> items, int sectionIndex, BuildContext context) {
    if (sectionTitleBuilder == null) {
      throw Exception('Cannot to build title. sectionTitleBuilder is null');
    }
    return sectionTitleBuilder!.call(context, sectionIndex);
  }

  @override
  List<Widget> buildSection(int itemCount, List<Widget> items, int sectionIndex,
      BuildContext context) {
    final List<Widget> section = [];

    for (var itemIndex = 0; itemIndex < itemCount; itemIndex++) {
      final item = itemBuilder(context, sectionIndex, itemIndex);

      section.add(StandardListSeparator());

      section.add(item);

    }
    return section;
  }
}