Widget _buildBlockStyleCollapse(BuildContext context) {
    return TDCollapse(
      style: TDCollapseStyle.block,
      expansionCallback: (int index, bool isExpanded) {
        setState(() {
          _blockStyleData[index].isExpanded = !isExpanded;
        });
      },
      children: _blockStyleData.map((CollapseDataItem item) {
        return TDCollapsePanel(
          headerBuilder: (BuildContext context, bool isExpanded) {
            return Text(item.headerValue);
          },
          isExpanded: item.isExpanded,
          body: const Text(randomString),
        );
      }).toList(),
    );
  }