mirror of
https://github.com/google/blockly.git
synced 2026-01-04 15:40:08 +01:00
90b3f75d82
Our files are up to a decade old, and have churned so much, that the initial author of the file no longer has much meaning. Furthermore, this will encourage developers to post to the developer group, rather than emailing Googlers (usually me) directly.
85 lines
2.5 KiB
JavaScript
85 lines
2.5 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 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');
|
|
const object = goog.require('Blockly.utils.object');
|
|
const {BlockSvg} = goog.require('Blockly.BlockSvg');
|
|
|
|
|
|
/**
|
|
* Abstract class for a component that can delete a block or bubble that is
|
|
* dropped on top of it.
|
|
* @extends {DragTarget}
|
|
* @implements {IDeleteArea}
|
|
* @constructor
|
|
* @alias Blockly.DeleteArea
|
|
*/
|
|
const DeleteArea = function() {
|
|
DeleteArea.superClass_.constructor.call(this);
|
|
|
|
/**
|
|
* 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;
|
|
};
|
|
object.inherits(DeleteArea, DragTarget);
|
|
|
|
/**
|
|
* 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.
|
|
*/
|
|
DeleteArea.prototype.wouldDelete = function(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
|
|
*/
|
|
DeleteArea.prototype.updateWouldDelete_ = function(wouldDelete) {
|
|
this.wouldDelete_ = wouldDelete;
|
|
};
|
|
|
|
exports = DeleteArea;
|