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a17cb7f12e
* introduce IDraggable interface * Add parameter to drag methods in IDragTarget * combines bubble/drag methods on IDragTarget and IDeleteArea to take an IDraggable element
65 lines
1.9 KiB
JavaScript
65 lines
1.9 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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* @author kozbial@google.com (Monica Kozbial)
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*/
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'use strict';
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goog.provide('Blockly.DeleteArea');
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goog.require('Blockly.BlockSvg');
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goog.require('Blockly.DragTarget');
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goog.require('Blockly.IDeleteArea');
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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 {Blockly.DragTarget}
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* @implements {Blockly.IDeleteArea}
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* @constructor
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*/
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Blockly.DeleteArea = function() {
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Blockly.DeleteArea.superClass_.constructor.call(this);
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/**
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* Whether the current block or bubble dragged over this delete area would be
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* deleted if dropped on this component.
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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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Blockly.utils.object.inherits(Blockly.DeleteArea, Blockly.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 {!Blockly.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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Blockly.DeleteArea.prototype.wouldDelete = function(element, couldConnect) {
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if (element instanceof Blockly.BlockSvg) {
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var block = /** @type {Blockly.BlockSvg} */ (element);
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var couldDeleteBlock = !block.getParent() && block.isDeletable();
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this.wouldDelete_ = couldDeleteBlock && !couldConnect;
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} else {
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this.wouldDelete_ = element.isDeletable();
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}
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return this.wouldDelete_;
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};
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