Function initSelectionObserver

packages/rrweb/src/record/observer.ts:1124–1163

(param: observerParam)

}

function initSelectionObserver(param: observerParam): listenerHandler {
  const { doc, mirror, blockClass, blockSelector, selectionCb } = param;
  let collapsed = true;

  const updateSelection = callbackWrapper(() => {
    const selection = doc.getSelection();

    if (!selection || (collapsed && selection?.isCollapsed)) return;

    collapsed = selection.isCollapsed || false;

    const ranges: SelectionRange[] = [];
    const count = selection.rangeCount || 0;

    for (let i = 0; i < count; i++) {
      const range = selection.getRangeAt(i);

      const { startContainer, startOffset, endContainer, endOffset } = range;

      const blocked =
        isBlocked(startContainer, blockClass, blockSelector, true) ||
        isBlocked(endContainer, blockClass, blockSelector, true);

      if (blocked) continue;

      ranges.push({
        start: mirror.getId(startContainer),
        startOffset,
        end: mirror.getId(endContainer),
        endOffset,
      });
    }

    selectionCb({ ranges });
  });

  updateSelection();

  return on('selectionchange', updateSelection);
}

function initCustomElementObserver({
  doc,