Function _handleAutoScroll

plugins/AutoScroll/AutoScroll.js:98–144

(evt, fallback)

		},

		_handleAutoScroll(evt, fallback) {
			const x = (evt.touches ? evt.touches[0] : evt).clientX,
				y = (evt.touches ? evt.touches[0] : evt).clientY,

				elem = document.elementFromPoint(x, y);

			touchEvt = evt;

			// IE does not seem to have native autoscroll,
			// Edge's autoscroll seems too conditional,
			// MACOS Safari does not have autoscroll,
			// Firefox and Chrome are good
			if (fallback || this.options.forceAutoScrollFallback || Edge || IE11OrLess || Safari) {
				autoScroll(evt, this.options, elem, fallback);

				// Listener for pointer element change
				let ogElemScroller = getParentAutoScrollElement(elem, true);
				if (
					scrolling &&
					(
						!pointerElemChangedInterval ||
						x !== lastAutoScrollX ||
						y !== lastAutoScrollY
					)
				) {
					pointerElemChangedInterval && clearPointerElemChangedInterval();
					// Detect for pointer elem change, emulating native DnD behaviour
					pointerElemChangedInterval = setInterval(() => {
						let newElem = getParentAutoScrollElement(document.elementFromPoint(x, y), true);
						if (newElem !== ogElemScroller) {
							ogElemScroller = newElem;
							clearAutoScrolls();
						}
						autoScroll(evt, this.options, newElem, fallback);
					}, 10);
					lastAutoScrollX = x;
					lastAutoScrollY = y;
				}
			} else {
				// if DnD is enabled (and browser has good autoscrolling), first autoscroll will already scroll, so get parent autoscroll of first autoscroll
				if (!this.options.bubbleScroll || getParentAutoScrollElement(elem, true) === getWindowScrollingElement()) {
					clearAutoScrolls();
					return;
				}
				autoScroll(evt, this.options, getParentAutoScrollElement(elem, false), false);
			}
		}
	};

	return Object.assign(AutoScroll, {