Function SwapPlugin

modular/sortable.esm.js:2688–2754

()

var lastSwapEl;
function SwapPlugin() {
  function Swap() {
    this.defaults = {
      swapClass: 'sortable-swap-highlight'
    };
  }
  Swap.prototype = {
    dragStart: function dragStart(_ref) {
      var dragEl = _ref.dragEl;
      lastSwapEl = dragEl;
    },
    dragOverValid: function dragOverValid(_ref2) {
      var completed = _ref2.completed,
        target = _ref2.target,
        onMove = _ref2.onMove,
        activeSortable = _ref2.activeSortable,
        changed = _ref2.changed,
        cancel = _ref2.cancel;
      if (!activeSortable.options.swap) return;
      var el = this.sortable.el,
        options = this.options;
      if (target && target !== el) {
        var prevSwapEl = lastSwapEl;
        if (onMove(target) !== false) {
          toggleClass(target, options.swapClass, true);
          lastSwapEl = target;
        } else {
          lastSwapEl = null;
        }
        if (prevSwapEl && prevSwapEl !== lastSwapEl) {
          toggleClass(prevSwapEl, options.swapClass, false);
        }
      }
      changed();
      completed(true);
      cancel();
    },
    drop: function drop(_ref3) {
      var activeSortable = _ref3.activeSortable,
        putSortable = _ref3.putSortable,
        dragEl = _ref3.dragEl;
      var toSortable = putSortable || this.sortable;
      var options = this.options;
      lastSwapEl && toggleClass(lastSwapEl, options.swapClass, false);
      if (lastSwapEl && (options.swap || putSortable && putSortable.options.swap)) {
        if (dragEl !== lastSwapEl) {
          toSortable.captureAnimationState();
          if (toSortable !== activeSortable) activeSortable.captureAnimationState();
          swapNodes(dragEl, lastSwapEl);
          toSortable.animateAll();
          if (toSortable !== activeSortable) activeSortable.animateAll();
        }
      }
    },
    nulling: function nulling() {
      lastSwapEl = null;
    }
  };