_onDragOver: function()

in src/OrchardCore.Themes/TheAdmin/Assets/js/Sortable.js [569:703]
110 lines of code
52 McCabe index (conditional complexity)

		_onDragOver: function (/**Event*/evt) {
			var el = this.el,
				target,
				dragRect,
				revert,
				options = this.options,
				group = options.group,
				groupPut = group.put,
				isOwner = (activeGroup === group),
				canSort = options.sort;

			if (evt.preventDefault !== void 0) {
				evt.preventDefault();
				!options.dragoverBubble && evt.stopPropagation();
			}

			moved = true;

			if (activeGroup && !options.disabled &&
				(isOwner
					? canSort || (revert = !rootEl.contains(dragEl)) // Reverting item into the original list
					: activeGroup.pull && groupPut && (
						(activeGroup.name === group.name) || // by Name
						(groupPut.indexOf && ~groupPut.indexOf(activeGroup.name)) // by Array
					)
				) &&
				(evt.rootEl === void 0 || evt.rootEl === this.el) // touch fallback
			) {
				// Smart auto-scrolling
				_autoScroll(evt, options, this.el);

				if (_silent) {
					return;
				}

				target = _closest(evt.target, options.draggable, el);
				dragRect = dragEl.getBoundingClientRect();

				if (revert) {
					_cloneHide(true);

					if (cloneEl || nextEl) {
						rootEl.insertBefore(dragEl, cloneEl || nextEl);
					}
					else if (!canSort) {
						rootEl.appendChild(dragEl);
					}

					return;
				}


				if ((el.children.length === 0) || (el.children[0] === ghostEl) ||
					(el === evt.target) && (target = _ghostIsLast(el, evt))
				) {

					if (target) {
						if (target.animated) {
							return;
						}

						targetRect = target.getBoundingClientRect();
					}

					_cloneHide(isOwner);

					if (_onMove(rootEl, el, dragEl, dragRect, target, targetRect) !== false) {
						if (!dragEl.contains(el)) {
							el.appendChild(dragEl);
							parentEl = el; // actualization
						}

						this._animate(dragRect, dragEl);
						target && this._animate(targetRect, target);
					}
				}
				else if (target && !target.animated && target !== dragEl && (target.parentNode[expando] !== void 0)) {
					if (lastEl !== target) {
						lastEl = target;
						lastCSS = _css(target);
						lastParentCSS = _css(target.parentNode);
					}


					var targetRect = target.getBoundingClientRect(),
						width = targetRect.right - targetRect.left,
						height = targetRect.bottom - targetRect.top,
						floating = /left|right|inline/.test(lastCSS.cssFloat + lastCSS.display)
							|| (lastParentCSS.display == 'flex' && lastParentCSS['flex-direction'].indexOf('row') === 0),
						isWide = (target.offsetWidth > dragEl.offsetWidth),
						isLong = (target.offsetHeight > dragEl.offsetHeight),
						halfway = (floating ? (evt.clientX - targetRect.left) / width : (evt.clientY - targetRect.top) / height) > 0.5,
						nextSibling = target.nextElementSibling,
						moveVector = _onMove(rootEl, el, dragEl, dragRect, target, targetRect),
						after
					;

					if (moveVector !== false) {
						_silent = true;
						setTimeout(_unsilent, 30);

						_cloneHide(isOwner);

						if (moveVector === 1 || moveVector === -1) {
							after = (moveVector === 1);
						}
						else if (floating) {
							var elTop = dragEl.offsetTop,
								tgTop = target.offsetTop;

							if (elTop === tgTop) {
								after = (target.previousElementSibling === dragEl) && !isWide || halfway && isWide;
							} else {
								after = tgTop > elTop;
							}
						} else {
							after = (nextSibling !== dragEl) && !isLong || halfway && isLong;
						}

						if (!dragEl.contains(el)) {
							if (after && !nextSibling) {
								el.appendChild(dragEl);
							} else {
								target.parentNode.insertBefore(dragEl, after ? nextSibling : target);
							}
						}

						parentEl = dragEl.parentNode; // actualization

						this._animate(dragRect, dragEl);
						this._animate(targetRect, target);
					}
				}
			}
		},