dmn-js-shared/lib/base/viewer/Viewer.js

Shared components used by dmn-js

import { Injector } from 'didi';
import core from './core';

/**
 * A base for React-style viewers.
 */
export default class Viewer {
  constructor(options = {}) {
    let {
      injector
    } = options;
    if (!injector) {
      let {
        modules,
        config
      } = this._init(options);
      injector = createInjector(config, modules);
    }
    this.get = injector.get;
    this.invoke = injector.invoke;
    this.get('eventBus').fire('viewer.init');
  }

  /**
   * Intialize and return modules and config used for creation.
   *
   * @param  {Object} options
   *
   * @return {Object} { modules=[], config }
   */
  _init(options) {
    let {
      modules,
      ...config
    } = options;
    return {
      modules,
      config
    };
  }

  /**
   * Destroy. This results in removing the attachment from the container.
   */
  destroy() {
    const eventBus = this.get('eventBus');
    eventBus.fire('viewer.destroy');
  }

  /**
   * Clear. Should be used to reset the state of any stateful services.
   */
  clear() {
    const eventBus = this.get('eventBus');
    eventBus.fire('viewer.clear');
  }
}

// helpers //////////////////////

function createInjector(config, modules) {
  const bootstrapModules = [{
    config: ['value', config]
  }, core].concat(modules || []);
  const injector = new Injector(bootstrapModules);
  injector.init();
  return injector;
}
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