# all files / diagram-js/lib/features/modeling/cmd/ MoveConnectionHandler.js

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     import { forEach } from 'min-dash';

    import {
      add as collectionAdd,
      remove as collectionRemove
    } from '../../../util/Collections';

    /**
     * A handler that implements reversible moving of connections.
     *
     * The handler differs from the layout connection handler in a sense
     * that it preserves the connection layout.
     */
    export default function MoveConnectionHandler() { }

    MoveConnectionHandler.prototype.execute = function(context) {

      var connection = context.connection,
          delta = context.delta;

      var newParent = context.newParent || connection.parent,
          newParentIndex = context.newParentIndex,
          oldParent = connection.parent;

      // save old parent in context
      context.oldParent = oldParent;
      context.oldParentIndex = collectionRemove(oldParent.children, connection);

      // add to new parent at position
      collectionAdd(newParent.children, connection, newParentIndex);

      // update parent
      connection.parent = newParent;

      // update waypoint positions
      forEach(connection.waypoints, function(p) {
        p.x += delta.x;
        p.y += delta.y;

        if (p.original) {
          p.original.x += delta.x;
          p.original.y += delta.y;
        }
      });

      return connection;
    };

    MoveConnectionHandler.prototype.revert = function(context) {

      var connection = context.connection,
          newParent = connection.parent,
          oldParent = context.oldParent,
          oldParentIndex = context.oldParentIndex,
          delta = context.delta;

      // remove from newParent
      collectionRemove(newParent.children, connection);

      // restore previous location in old parent
      collectionAdd(oldParent.children, connection, oldParentIndex);

      // restore parent
      connection.parent = oldParent;

      // revert to old waypoint positions
      forEach(connection.waypoints, function(p) {
        p.x -= delta.x;
        p.y -= delta.y;

        if (p.original) {
          p.original.x -= delta.x;
          p.original.y -= delta.y;
        }
      });

      return connection;
    };