@shockpkg/core/esm/dispatcher.mjs

shockpkg core

/**
 * Event dispatcher.
 */
export class Dispatcher {
  /**
   * Event context.
   */

  /**
   * Event handlers.
   */
  _handlers = new Set();

  /**
   * Event dispatcher constructor.
   *
   * @param context Context object.
   */
  constructor(context) {
    this._context = context;
  }

  /**
   * Add listener.
   *
   * @param handler Event handler.
   */
  on(handler) {
    this._handlers.add(handler);
  }

  /**
   * Remove listener.
   *
   * @param handler Event handler.
   */
  off(handler) {
    this._handlers.delete(handler);
  }

  /**
   * Trigger handlers.
   *
   * @param event Event data.
   * @returns Handler count.
   */
  trigger(event) {
    const self = this._context;
    let i = 0;
    for (const cb of this._handlers) {
      cb.call(self, event);
      i++;
    }
    return i;
  }
}
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