Issue #3300504 by mxh: Provide explicit events for customizing the confirmation form

eca_vbo.confirm:

  path: '/views-bulk-operations/eca-vbo-confirm/{view_id}/{display_id}'

  defaults:

    _form: '\Drupal\eca_vbo\Form\EcaVboConfirm'

    _title: 'Confirm execution'

  requirements:

    _views_bulk_operation_access: 'TRUE'

  options:

    _admin_route: TRUE

   */

  public const FORM_SUBMIT = 'eca_vbo.form_submit';

  /**

   * Identifies the \Drupal\eca_vbo\Event\VboConfirmFormBuildEvent event.

   *

   * @Event

   *

   * @var string

   */

  public const CONFIRM_FORM_BUILD = 'eca_vbo.confirm_form_build';

  /**

   * Identifies the \Drupal\eca_vbo\Event\VboConfirmFormValidateEvent event.

   *

   * @Event

   *

   * @var string

   */

  public const CONFIRM_FORM_VALIDATE = 'eca_vbo.confirm_form_validate';

  /**

   * Identifies the \Drupal\eca_vbo\Event\VboConfirmFormSubmitEvent event.

   *

   * @Event

   *

   * @var string

   */

  public const CONFIRM_FORM_SUBMIT = 'eca_vbo.confirm_form_submit';

}

<?php

namespace Drupal\eca_vbo\Event;

/**

 * Dispatches when an VBO confirm execution form is being build up.

 *

 * @internal

 *   This class is not meant to be used as a public API. It is subject for name

 *   change or may be removed completely, also on minor version updates.

 */

class VboConfirmFormBuildEvent extends VboFormEventBase {}

<?php

namespace Drupal\eca_vbo\Event;

/**

 * Dispatches when an VBO confirm execution form is being submitted.

 *

 * @internal

 *   This class is not meant to be used as a public API. It is subject for name

 *   change or may be removed completely, also on minor version updates.

 */

class VboConfirmFormSubmitEvent extends VboFormEventBase {}

<?php

namespace Drupal\eca_vbo\Event;

/**

 * Dispatches when an VBO confirm execution form is being validated.

 *

 * @internal

 *   This class is not meant to be used as a public API. It is subject for name

 *   change or may be removed completely, also on minor version updates.

 */

class VboConfirmFormValidateEvent extends VboFormEventBase {}