mirror of
https://github.com/google/blockly.git
synced 2026-01-08 01:20:12 +01:00
9e8c5ea8ed
* refactor: update several files to es6 classes * refactor: update several files to es6 classes * chore: add some type casts for specificity about event types * chore: run formatter * chore: rebuild
86 lines
2.4 KiB
JavaScript
86 lines
2.4 KiB
JavaScript
/**
|
|
* @license
|
|
* Copyright 2021 Google LLC
|
|
* SPDX-License-Identifier: Apache-2.0
|
|
*/
|
|
|
|
/**
|
|
* @fileoverview The abstract class for a component that can delete a block or
|
|
* bubble that is dropped on top of it.
|
|
*/
|
|
|
|
'use strict';
|
|
|
|
/**
|
|
* The abstract class for a component that can delete a block or
|
|
* bubble that is dropped on top of it.
|
|
* @class
|
|
*/
|
|
goog.module('Blockly.DeleteArea');
|
|
|
|
const {BlockSvg} = goog.require('Blockly.BlockSvg');
|
|
const {DragTarget} = goog.require('Blockly.DragTarget');
|
|
/* eslint-disable-next-line no-unused-vars */
|
|
const {IDeleteArea} = goog.require('Blockly.IDeleteArea');
|
|
/* eslint-disable-next-line no-unused-vars */
|
|
const {IDraggable} = goog.requireType('Blockly.IDraggable');
|
|
|
|
|
|
/**
|
|
* Abstract class for a component that can delete a block or bubble that is
|
|
* dropped on top of it.
|
|
* @extends {DragTarget}
|
|
* @implements {IDeleteArea}
|
|
*/
|
|
class DeleteArea extends DragTarget {
|
|
/**
|
|
* @alias Blockly.DeleteArea
|
|
*/
|
|
constructor() {
|
|
super();
|
|
|
|
/**
|
|
* Whether the last block or bubble dragged over this delete area would be
|
|
* deleted if dropped on this component.
|
|
* This property is not updated after the block or bubble is deleted.
|
|
* @type {boolean}
|
|
* @protected
|
|
*/
|
|
this.wouldDelete_ = false;
|
|
}
|
|
|
|
/**
|
|
* Returns whether the provided block or bubble would be deleted if dropped on
|
|
* this area.
|
|
* This method should check if the element is deletable and is always called
|
|
* before onDragEnter/onDragOver/onDragExit.
|
|
* @param {!IDraggable} element The block or bubble currently being
|
|
* dragged.
|
|
* @param {boolean} couldConnect Whether the element could could connect to
|
|
* another.
|
|
* @return {boolean} Whether the element provided would be deleted if dropped
|
|
* on this area.
|
|
*/
|
|
wouldDelete(element, couldConnect) {
|
|
if (element instanceof BlockSvg) {
|
|
const block = /** @type {BlockSvg} */ (element);
|
|
const couldDeleteBlock = !block.getParent() && block.isDeletable();
|
|
this.updateWouldDelete_(couldDeleteBlock && !couldConnect);
|
|
} else {
|
|
this.updateWouldDelete_(element.isDeletable());
|
|
}
|
|
return this.wouldDelete_;
|
|
}
|
|
|
|
/**
|
|
* Updates the internal wouldDelete_ state.
|
|
* @param {boolean} wouldDelete The new value for the wouldDelete state.
|
|
* @protected
|
|
*/
|
|
updateWouldDelete_(wouldDelete) {
|
|
this.wouldDelete_ = wouldDelete;
|
|
}
|
|
}
|
|
|
|
exports.DeleteArea = DeleteArea;
|