@xiamh/block-shareable-procedures-custom/src/events_procedure_parameter_delete.ts

A plugin that adds procedure blocks which are backed by explicit data models.

/**
 * @license
 * Copyright 2022 Google LLC
 * SPDX-License-Identifier: Apache-2.0
 */

import * as Blockly from 'blockly/core';
import {ProcedureParameterBase, ProcedureParameterBaseJson} from './events_procedure_parameter_base';


/**
 * Notifies listeners that a parameter has been removed from a procedure.
 */
export class ProcedureParameterDelete extends ProcedureParameterBase {
  static readonly TYPE = 'procedure_parameter_delete';

  /** A string used to check the type of the event. */
  type = ProcedureParameterDelete.TYPE;

  /**
   * Constructs the procedure parameter delete event.
   * @param workspace The workspace this event is associated with.
   * @param procedure The procedure model this event is associated with.
   * @param parameter The parameter model that was just removed from the
   *     procedure.
   * @param index The index the parameter was at before it was removed.
   */
  constructor(
      workspace: Blockly.Workspace,
      procedure: Blockly.procedures.IProcedureModel,
      parameter: Blockly.procedures.IParameterModel,
      readonly index: number) {
    super(workspace, procedure, parameter);
  }

  /**
   * Replays the event in the workspace.
   * @param forward if true, play the event forward (redo), otherwise play it
   *     backward (undo).
   */
  run(forward: boolean) {
    const workspace = this.getEventWorkspace_();
    const procedureMap = workspace.getProcedureMap();
    const procedureModel = procedureMap.get(this.procedure.getId());
    if (!procedureModel) {
      throw new Error(
          'Cannot add a parameter to a procedure that does not exist ' +
          'in the procedure map');
    }
    if (forward) {
      procedureModel.deleteParameter(this.index);
    } else {
      procedureModel.insertParameter(this.parameter, this.index);
    }
  }

  /**
   * Encode the event as JSON.
   * @returns JSON representation.
   */
  toJson(): ProcedureParameterDeleteJson {
    const json = super.toJson() as ProcedureParameterDeleteJson;
    json['index'] = this.index;
    return json;
  }

  /**
   * Deserializes the JSON event.
   * @param json The JSON representation of a procedure parameter delete event.
   * @param workspace The workspace to deserialize the event into.
   * @returns The new procedure parameter delete event.
   * @internal
   */
  static fromJson(
      json: ProcedureParameterDeleteJson,
      workspace: Blockly.Workspace
  ): ProcedureParameterDelete {
    const {procedure, parameter} = ProcedureParameterBase.findMatchingParameter(
        workspace, json['procedureId'], json['parameterId']);
    if (!parameter) {
      throw new Error('Cannot delete a non existant parameter');
    }
    return new ProcedureParameterDelete(
        workspace, procedure, parameter, json['index']);
  }
}

export interface ProcedureParameterDeleteJson extends
    ProcedureParameterBaseJson {
  index: number;
}

Blockly.registry.register(
    Blockly.registry.Type.EVENT,
    ProcedureParameterDelete.TYPE,
    ProcedureParameterDelete);