Method [onDragOver]

src/Sortable/Sortable.js:221–261

* Drag over handler * @private * @param {DragOverEvent} event - Drag over event

(event)

   * @param {DragOverEvent} event - Drag over event
   */
  [onDragOver](event) {
    if (event.over === event.originalSource || event.over === event.source) {
      return;
    }

    const {source, over, overContainer} = event;
    const oldIndex = this.index(source);

    const sortableSortEvent = new SortableSortEvent({
      dragEvent: event,
      currentIndex: oldIndex,
      source,
      over,
    });

    this.trigger(sortableSortEvent);

    if (sortableSortEvent.canceled()) {
      return;
    }

    const children = this.getDraggableElementsForContainer(overContainer);
    const moves = move({source, over, overContainer, children});

    if (!moves) {
      return;
    }

    const {oldContainer, newContainer} = moves;
    const newIndex = this.index(source);

    const sortableSortedEvent = new SortableSortedEvent({
      dragEvent: event,
      oldIndex,
      newIndex,
      oldContainer,
      newContainer,
    });

    this.trigger(sortableSortedEvent);
  }

  /**
   * Drag stop handler