Method shouldScrollLyricIntoView

js/ReadingSystem.js:527–536

* 判断歌词是否需要滚动到可视区域 * @param {HTMLElement} activeLine - 活跃的歌词行 * @returns {boolean}

(activeLine)

   * @returns {boolean}
   */
  shouldScrollLyricIntoView(activeLine) {
    if (!this.dom.lyricsContainer) return true;

    const containerRect = this.dom.lyricsContainer.getBoundingClientRect();
    const lineRect = activeLine.getBoundingClientRect();
    const topThreshold = containerRect.top + containerRect.height * this.config.UI.LYRIC_SCROLL_THRESHOLD;
    const bottomThreshold = containerRect.bottom - containerRect.height * this.config.UI.LYRIC_SCROLL_THRESHOLD;

    return lineRect.top < topThreshold || lineRect.bottom > bottomThreshold;
  }

  // =========================================================================
  // 单句循环