mirror of
https://github.com/scratchfoundation/scratch-blocks.git
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113 lines
2.9 KiB
JavaScript
113 lines
2.9 KiB
JavaScript
/**
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* @license
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* Visual Blocks Editor
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*
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* Copyright 2018 Google Inc.
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* https://developers.google.com/blockly/
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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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.provide('Blockly.Events.Abstract');
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goog.require('Blockly.Events');
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goog.require('goog.array');
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goog.require('goog.math.Coordinate');
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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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Blockly.Events.Abstract = function() {
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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 = Blockly.Events.group_;
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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 = Blockly.Events.recordUndo;
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};
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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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Blockly.Events.Abstract.prototype.toJson = function() {
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var json = {
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'type': this.type
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};
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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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Blockly.Events.Abstract.prototype.fromJson = function(json) {
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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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* By default we assume events are non-null. Subclasses may override to
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* indicate that they do not change state.
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* @return {boolean} False if something changed.
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*/
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Blockly.Events.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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Blockly.Events.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 {Blockly.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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Blockly.Events.Abstract.prototype.getEventWorkspace_ = function() {
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var workspace = Blockly.Workspace.getById(this.workspaceId);
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if (!workspace) {
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throw Error('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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