WorkflowStateDeleteForm.php

<?php

namespace Drupal\workflows\Form;

use Drupal\workflows\WorkflowInterface;
use Drupal\Core\Form\ConfirmFormBase;
use Drupal\Core\Form\FormStateInterface;
use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;

/**
 * Builds the form to delete states from Workflow entities.
 *
 * @internal
 */
class WorkflowStateDeleteForm extends ConfirmFormBase {
    
    /**
     * The workflow entity the state being deleted belongs to.
     *
     * @var \Drupal\workflows\WorkflowInterface
     */
    protected $workflow;
    
    /**
     * The state being deleted.
     *
     * @var string
     */
    protected $stateId;
    
    /**
     * {@inheritdoc}
     */
    public function getFormId() {
        return 'workflow_state_delete_form';
    }
    
    /**
     * {@inheritdoc}
     */
    public function getQuestion() {
        return $this->t('Are you sure you want to delete %state from %workflow?', [
            '%state' => $this->workflow
                ->getTypePlugin()
                ->getState($this->stateId)
                ->label(),
            '%workflow' => $this->workflow
                ->label(),
        ]);
    }
    
    /**
     * {@inheritdoc}
     */
    public function getCancelUrl() {
        return $this->workflow
            ->toUrl();
    }
    
    /**
     * {@inheritdoc}
     */
    public function getConfirmText() {
        return $this->t('Delete');
    }
    
    /**
     * Form constructor.
     *
     * @param array $form
     *   An associative array containing the structure of the form.
     * @param \Drupal\Core\Form\FormStateInterface $form_state
     *   The current state of the form.
     * @param \Drupal\workflows\WorkflowInterface $workflow
     *   The workflow entity being edited.
     * @param string|null $workflow_state
     *   The workflow state being deleted.
     *
     * @return array
     *   The form structure.
     */
    public function buildForm(array $form, FormStateInterface $form_state, WorkflowInterface $workflow = NULL, $workflow_state = NULL) {
        if (!$workflow->getTypePlugin()
            ->hasState($workflow_state)) {
            throw new NotFoundHttpException();
        }
        $this->workflow = $workflow;
        $this->stateId = $workflow_state;
        if ($this->workflow
            ->getTypePlugin()
            ->workflowStateHasData($this->workflow, $this->workflow
            ->getTypePlugin()
            ->getState($this->stateId))) {
            $form['#title'] = $this->getQuestion();
            $form['description'] = [
                '#markup' => $this->t('This workflow state is in use. You cannot remove this workflow state until you have removed all content using it.'),
            ];
            return $form;
        }
        return parent::buildForm($form, $form_state);
    }
    
    /**
     * {@inheritdoc}
     */
    public function submitForm(array &$form, FormStateInterface $form_state) {
        $workflow_label = $this->workflow
            ->getTypePlugin()
            ->getState($this->stateId)
            ->label();
        $this->workflow
            ->getTypePlugin()
            ->deleteState($this->stateId);
        $this->workflow
            ->save();
        $this->messenger()
            ->addStatus($this->t('State %label deleted.', [
            '%label' => $workflow_label,
        ]));
        $form_state->setRedirectUrl($this->getCancelUrl());
    }

}