mirror of
https://github.com/google/blockly.git
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Beka Westberg
111 lines
2.5 KiB
TypeScript
111 lines
2.5 KiB
TypeScript
/**
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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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*/
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/**
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* Abstract class for events fired as a result of actions in
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* Blockly's editor.
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* @class
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*/
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import {Workspace} from '../workspace';
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import * as eventUtils from './utils';
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/**
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* Abstract class for an event.
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* @alias Blockly.Events.Abstract
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*/
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export abstract class Abstract {
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/** Whether or not the event is blank (to be populated by fromJson). */
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isBlank: boolean|null = null;
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/** The workspace identifier for this event. */
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workspaceId?: string = undefined;
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group: string;
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recordUndo: boolean;
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/** Whether or not the event is a UI event. */
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isUiEvent = false;
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/** Type of this event. */
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type?: string = undefined;
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/** @alias Blockly.Events.Abstract */
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constructor() {
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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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*/
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this.group = eventUtils.getGroup();
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/** Sets whether the event should be added to the undo stack. */
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this.recordUndo = eventUtils.getRecordUndo();
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}
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/**
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* Encode the event as JSON.
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* @return JSON representation.
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*/
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toJson(): AnyDuringMigration {
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const json = {'type': this.type};
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if (this.group) {
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(json as AnyDuringMigration)['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 json JSON representation.
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*/
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fromJson(json: AnyDuringMigration) {
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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 True if null, false if something changed.
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*/
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isNull(): boolean {
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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 _forward True if run forward, false if run backward (undo).
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*/
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run(_forward: boolean) {}
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// Defined by subclasses.
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/**
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* Get workspace the event belongs to.
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* @return The workspace the event belongs to.
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* @throws {Error} if workspace is null.
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* @internal
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*/
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getEventWorkspace_(): Workspace {
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let workspace;
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if (this.workspaceId) {
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workspace = 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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}
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