Access clientHeight from Content

Ionic Framework ionic-v3
1

I need to detect scroll position and if person not on the bottom of the scroll view - disable autoscroll. Checked how scrollBottom() calculating position and pulled it to my code:

              var topPos = this.content.getScrollTop()
              var bottomPos = this.content._scrollEle.scrollHeight-this.content._scrollEle.clientHeight;

....

              if (topPos >= bottomPos-10) {
                setTimeout(() => {
                  this.content.scrollToBottom();
                }, 200);
              }

scrollHeight I can get from getContentDimensions() method, but what the right way of getting clientHeight?