checkOffset method

bool checkOffset(
  1. double? offset
)

check offset illegal true is OK false is illegal

Implementation

bool checkOffset(double? offset) {
  if (offset == null) return false;

  calculateTotalHeight();

  if (offset >= maxOffset && offset <= 0) {
    return true;
  } else {
    if (offset <= maxOffset && offset > _lyricOffset) {
      return true;
    }
  }
  LyricsLog.logD("越界取消偏移 可偏移：$maxOffset 目标偏移：$offset 当前：$_lyricOffset ");
  return false;
}