captain-ui/es/common/scroll.js

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export default {
  getScrollEventTarget: function getScrollEventTarget(element, rootParent) {
    if (rootParent === void 0) {
      rootParent = window;
    }

    var node = element;

    while (node && node.tagName !== 'HTML' && node.tagName !== 'BODY' && node.nodeType === 1 && node !== rootParent) {
      var _window$getComputedSt = window.getComputedStyle(node),
          overflowY = _window$getComputedSt.overflowY;

      if (overflowY === 'scroll' || overflowY === 'auto') {
        return node;
      }

      node = node.parentNode;
    }

    return rootParent;
  },
  getScrollTop: function getScrollTop(element) {
    return 'scrollTop' in element ? element.scrollTop : element.pageYOffset;
  },
  setScrollTop: function setScrollTop(element, value) {
    'scrollTop' in element ? element.scrollTop = value : element.scrollTo(element.scrollX, value);
  },
  getElementTop: function getElementTop(element) {
    return (element === window ? 0 : element.getBoundingClientRect().top) + this.getScrollTop(window);
  },
  getVisibleHeight: function getVisibleHeight(element) {
    return element === window ? element.innerHeight : element.getBoundingClientRect().height;
  }
};