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a3b52aaab3
* Migrate core/events/events.js to ES6 const/let * Migrate core/events/events.js to goog.module * Migrate core/events/events.js to named requires * clang-format core/events/events.js * Migrate Blockly core to use getRecordUndo/setRecordUndo * Update core/events.js to reflect latest guidance around exporting mutable fields
117 lines
2.6 KiB
JavaScript
117 lines
2.6 KiB
JavaScript
/**
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* @license
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* Copyright 2018 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 Abstract class for events fired as a result of actions in
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* Blockly's editor.
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* @author fraser@google.com (Neil Fraser)
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*/
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'use strict';
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goog.module('Blockly.Events.Abstract');
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goog.module.declareLegacyNamespace();
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const Events = goog.require('Blockly.Events');
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/* eslint-disable-next-line no-unused-vars */
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const Workspace = goog.requireType('Blockly.Workspace');
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/**
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* Abstract class for an event.
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* @constructor
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*/
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const Abstract = function() {
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/**
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* Whether or not the event is blank (to be populated by fromJson).
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* @type {?boolean}
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*/
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this.isBlank = null;
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/**
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* The workspace identifier for this event.
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* @type {string|undefined}
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*/
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this.workspaceId = undefined;
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/**
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* The event group id for the group this event belongs to. Groups define
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* events that should be treated as an single action from the user's
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* perspective, and should be undone together.
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* @type {string}
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*/
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this.group = Events.getGroup();
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/**
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* Sets whether the event should be added to the undo stack.
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* @type {boolean}
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*/
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this.recordUndo = Events.getRecordUndo();
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};
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/**
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* Whether or not the event is a UI event.
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* @type {boolean}
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*/
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Abstract.prototype.isUiEvent = false;
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/**
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* Encode the event as JSON.
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* @return {!Object} JSON representation.
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*/
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Abstract.prototype.toJson = function() {
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const json = {'type': this.type};
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if (this.group) {
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json['group'] = this.group;
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}
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return json;
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};
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/**
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* Decode the JSON event.
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* @param {!Object} json JSON representation.
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*/
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Abstract.prototype.fromJson = function(json) {
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this.isBlank = false;
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this.group = json['group'];
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};
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/**
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* Does this event record any change of state?
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* @return {boolean} True if null, false if something changed.
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*/
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Abstract.prototype.isNull = function() {
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return false;
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};
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/**
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* Run an event.
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* @param {boolean} _forward True if run forward, false if run backward (undo).
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*/
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Abstract.prototype.run = function(_forward) {
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// Defined by subclasses.
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};
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/**
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* Get workspace the event belongs to.
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* @return {!Workspace} The workspace the event belongs to.
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* @throws {Error} if workspace is null.
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* @protected
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*/
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Abstract.prototype.getEventWorkspace_ = function() {
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let workspace;
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if (this.workspaceId) {
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workspace = goog.module.get('Blockly.Workspace').getById(this.workspaceId);
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}
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if (!workspace) {
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throw Error(
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'Workspace is null. Event must have been generated from real' +
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' Blockly events.');
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}
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return workspace;
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};
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exports = Abstract;
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