Customize section class

[tp7309]

You can define an section class as you like, the only requirement is implement ExpandableListSection, this is to provide item data list in section. Like this:

class Section implements ExpandableListSection<Widget> {
  bool expanded;
  Widget header;
  List<Widget> items;

  @override
  List<Widget> getItems() {
    return items;
  }

  @override
  bool isSectionExpanded() {
    return expanded;
  }

  @override
  void setSectionExpanded(bool expanded) {
    this.expanded = expanded;
  }
}
``

[emvaized]

With this implementation of Section class I get the following error:

[tp7309]

class Section implements ExpandableListSection<Widget> {}
//so:
SliverExpandableChildDelegate<Widget, Section>()