prevArticle method

SummaryArticle? prevArticle(
  1. SummaryArticle article
)

Find the previous sibling article.

Implementation

SummaryArticle? prevArticle(SummaryArticle article) {
  final level = article.level;
  SummaryArticle? prev;
  findArticle((a) {
    if (a.level == level) {
      return true;
    }
    if (a.ref != null) {
      prev = a;
    }
    return false;
  });
  return prev;
}