initData method
Implementation
@override
initData(Rect rect, {int? maxLines}) {
super.initData(rect);
_isInit = true;
scrollRows.clear();
centerRows.clear();
var lines = rect.height ~/ rowHeight;
_maxLines = math.min(maxLines ?? lines, lines);
for (int i = 0; i < _maxLines!; i++) {
scrollRows.add(<DanmuItem<T>>[]);
centerRows.add(null);
}
}