clickIndexBar method

void clickIndexBar(
  1. int index
)

点击索引，列表滑动

Implementation

void clickIndexBar(int index) {
  if (index == 0) {
    _scrollController.jumpTo(0);
    return;
  }
  double position = 0;
  int length = 0;
  // 计算位置
  for (int i = 0; i < _mList.length; i++) {
    if (_mList[index].letter == _mList[i].letter) {
      position = i * widget.itemHeadHeight! + length * widget.itemHeight!;
    }
    length += _mList[i].data!.length;
  }
  _scrollController.jumpTo(position);
}