text: /**
   * @license
   * Copyright 2021 Google LLC
   * SPDX-License-Identifier: Apache-2.0
   */
  
  /**
   * @fileoverview The abstract class for a component with custom behaviour when a
   * block or bubble is dragged over or dropped on top of it.
   */
  
  'use strict';
  
  /**
   * The abstract class for a component with custom behaviour when a
   * block or bubble is dragged over or dropped on top of it.
   * @class
   */
  goog.module('Blockly.DragTarget');
  
  /* eslint-disable-next-line no-unused-vars */
  const {IDragTarget} = goog.require('Blockly.IDragTarget');
  /* eslint-disable-next-line no-unused-vars */
  const {IDraggable} = goog.requireType('Blockly.IDraggable');
  /* eslint-disable-next-line no-unused-vars */
  const {Rect} = goog.requireType('Blockly.utils.Rect');
  
  
  /**
   * Abstract class for a component with custom behaviour when a block or bubble
   * is dragged over or dropped on top of it.
   * @implements {IDragTarget}
   * @constructor
   * @alias Blockly.DragTarget
   */
  const DragTarget = function() {};
  
  /**
   * Returns the bounding rectangle of the drag target area in pixel units
   * relative to the Blockly injection div.
   * @return {?Rect} The component's bounding box. Null if drag
   *   target area should be ignored.
   */
  DragTarget.prototype.getClientRect;
  
  /**
   * Handles when a cursor with a block or bubble enters this drag target.
   * @param {!IDraggable} _dragElement The block or bubble currently being
   *   dragged.
   */
  DragTarget.prototype.onDragEnter = function(_dragElement) {
    // no-op
  };
  
  /**
   * Handles when a cursor with a block or bubble is dragged over this drag
   * target.
   * @param {!IDraggable} _dragElement The block or bubble currently being
   *   dragged.
   */
  DragTarget.prototype.onDragOver = function(_dragElement) {
    // no-op
  };
  
  /**
   * Handles when a cursor with a block or bubble exits this drag target.
   * @param {!IDraggable} _dragElement The block or bubble currently being
   *   dragged.
   */
  DragTarget.prototype.onDragExit = function(_dragElement) {
    // no-op
  };
  
  /**
   * Handles when a block or bubble is dropped on this component.
   * Should not handle delete here.
   * @param {!IDraggable} _dragElement The block or bubble currently being
   *   dragged.
   */
  DragTarget.prototype.onDrop = function(_dragElement) {
    // no-op
  };
  
  /**
   * Returns whether the provided block or bubble should not be moved after being
   * dropped on this component. If true, the element will return to where it was
   * when the drag started.
   * @param {!IDraggable} _dragElement The block or bubble currently being
   *   dragged.
   * @return {boolean} Whether the block or bubble provided should be returned to
   *     drag start.
   */
  DragTarget.prototype.shouldPreventMove = function(_dragElement) {
    return false;
  };
  
  exports.DragTarget = DragTarget;
  