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85 lines
2.5 KiB
JavaScript
85 lines
2.5 KiB
JavaScript
/**
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* @license
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* Copyright 2021 Google LLC
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* SPDX-License-Identifier: Apache-2.0
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*/
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/**
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* @fileoverview The abstract class for a component that can delete a block or
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* bubble that is dropped on top of it.
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*/
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'use strict';
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/**
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* The abstract class for a component that can delete a block or
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* bubble that is dropped on top of it.
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* @class
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*/
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goog.module('Blockly.DeleteArea');
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const object = goog.require('Blockly.utils.object');
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const {BlockSvg} = goog.require('Blockly.BlockSvg');
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const {DragTarget} = goog.require('Blockly.DragTarget');
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/* eslint-disable-next-line no-unused-vars */
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const {IDeleteArea} = goog.require('Blockly.IDeleteArea');
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/* eslint-disable-next-line no-unused-vars */
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const {IDraggable} = goog.requireType('Blockly.IDraggable');
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/**
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* Abstract class for a component that can delete a block or bubble that is
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* dropped on top of it.
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* @extends {DragTarget}
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* @implements {IDeleteArea}
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* @constructor
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* @alias Blockly.DeleteArea
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*/
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const DeleteArea = function() {
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DeleteArea.superClass_.constructor.call(this);
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/**
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* Whether the last block or bubble dragged over this delete area would be
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* deleted if dropped on this component.
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* This property is not updated after the block or bubble is deleted.
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* @type {boolean}
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* @protected
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*/
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this.wouldDelete_ = false;
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};
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object.inherits(DeleteArea, DragTarget);
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/**
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* Returns whether the provided block or bubble would be deleted if dropped on
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* this area.
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* This method should check if the element is deletable and is always called
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* before onDragEnter/onDragOver/onDragExit.
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* @param {!IDraggable} element The block or bubble currently being
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* dragged.
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* @param {boolean} couldConnect Whether the element could could connect to
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* another.
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* @return {boolean} Whether the element provided would be deleted if dropped on
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* this area.
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*/
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DeleteArea.prototype.wouldDelete = function(element, couldConnect) {
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if (element instanceof BlockSvg) {
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const block = /** @type {BlockSvg} */ (element);
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const couldDeleteBlock = !block.getParent() && block.isDeletable();
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this.updateWouldDelete_(couldDeleteBlock && !couldConnect);
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} else {
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this.updateWouldDelete_(element.isDeletable());
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}
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return this.wouldDelete_;
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};
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/**
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* Updates the internal wouldDelete_ state.
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* @param {boolean} wouldDelete The new value for the wouldDelete state.
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* @protected
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*/
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DeleteArea.prototype.updateWouldDelete_ = function(wouldDelete) {
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this.wouldDelete_ = wouldDelete;
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};
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exports.DeleteArea = DeleteArea;
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