class ViewEditForm

class ViewEditForm extends ViewFormBase {
    
    /**
     * The views temp store.
     *
     * @var \Drupal\Core\TempStore\SharedTempStore
     */
    protected $tempStore;
    
    /**
     * The request object.
     *
     * @var \Symfony\Component\HttpFoundation\RequestStack
     */
    protected $requestStack;
    
    /**
     * The date formatter service.
     *
     * @var \Drupal\Core\Datetime\DateFormatterInterface
     */
    protected $dateFormatter;
    
    /**
     * The element info manager.
     *
     * @var \Drupal\Core\Render\ElementInfoManagerInterface
     */
    protected $elementInfo;
    
    /**
     * The theme manager.
     *
     * @var \Drupal\Core\Theme\ThemeManagerInterface
     */
    protected $themeManager;
    
    /**
     * The module handler service.
     *
     * @var \Drupal\Core\Extension\ModuleHandlerInterface
     */
    protected $moduleHandler;
    
    /**
     * Constructs a new ViewEditForm object.
     *
     * @param \Drupal\Core\TempStore\SharedTempStoreFactory $temp_store_factory
     *   The factory for the temp store object.
     * @param \Symfony\Component\HttpFoundation\RequestStack $requestStack
     *   The request stack object.
     * @param \Drupal\Core\Datetime\DateFormatterInterface $date_formatter
     *   The date Formatter service.
     * @param \Drupal\Core\Render\ElementInfoManagerInterface $element_info
     *   The element info manager.
     * @param \Drupal\Core\Theme\ThemeManagerInterface $theme_manager
     *   The theme manager.
     * @param \Drupal\Core\Extension\ModuleHandlerInterface $module_handler
     *   The module handler service.
     */
    public function __construct(SharedTempStoreFactory $temp_store_factory, RequestStack $requestStack, DateFormatterInterface $date_formatter, ElementInfoManagerInterface $element_info, ThemeManagerInterface $theme_manager, ModuleHandlerInterface $module_handler) {
        $this->tempStore = $temp_store_factory->get('views');
        $this->requestStack = $requestStack;
        $this->dateFormatter = $date_formatter;
        $this->elementInfo = $element_info;
        $this->themeManager = $theme_manager;
        $this->moduleHandler = $module_handler;
    }
    
    /**
     * {@inheritdoc}
     */
    public static function create(ContainerInterface $container) {
        return new static($container->get('tempstore.shared'), $container->get('request_stack'), $container->get('date.formatter'), $container->get('element_info'), $container->get('theme.manager'), $container->get('module_handler'));
    }
    
    /**
     * {@inheritdoc}
     */
    public function form(array $form, FormStateInterface $form_state) {
        
        /** @var \Drupal\views_ui\ViewUI $view */
        $view = $this->entity;
        $display_id = $this->displayID;
        // Do not allow the form to be cached, because $form_state->get('view') can become
        // stale between page requests.
        // See views_ui_ajax_get_form() for how this affects #ajax.
        // @todo To remove this and allow the form to be cacheable:
        //   - Change $form_state->get('view') to $form_state->getTemporary()['view'].
        //   - Add a #process function to initialize $form_state->getTemporary()['view']
        //     on cached form submissions.
        //   - Use \Drupal\Core\Form\FormStateInterface::loadInclude().
        $form_state->disableCache();
        if ($display_id) {
            if (!$view->getExecutable()
                ->setDisplay($display_id)) {
                $form['#markup'] = $this->t('Invalid display id @display', [
                    '@display' => $display_id,
                ]);
                return $form;
            }
        }
        $form['#tree'] = TRUE;
        $form['#attached']['library'][] = 'core/drupal.dialog.ajax';
        $form['#attached']['library'][] = 'core/drupal.states';
        $form['#attached']['library'][] = 'core/drupal.tabledrag';
        $form['#attached']['library'][] = 'views_ui/views_ui.admin';
        $form['#attached']['library'][] = 'views_ui/admin.styling';
        $form += [
            '#prefix' => '',
            '#suffix' => '',
        ];
        $view_status = $view->status() ? 'enabled' : 'disabled';
        $form['#prefix'] .= '<div class="views-edit-view views-admin ' . $view_status . ' clearfix">';
        $form['#suffix'] = '</div>' . $form['#suffix'];
        $form['#attributes']['class'] = [
            'form-edit',
        ];
        if ($view->isLocked()) {
            $form['locked'] = [
                '#type' => 'container',
                '#attributes' => [
                    'class' => [
                        'view-locked',
                        'messages',
                        'messages--warning',
                    ],
                ],
                '#weight' => -10,
                'message' => [
                    '#type' => 'break_lock_link',
                    '#label' => $view->getEntityType()
                        ->getSingularLabel(),
                    '#lock' => $view->getLock(),
                    '#url' => $view->toUrl('break-lock-form'),
                ],
            ];
        }
        else {
            $form['changed'] = [
                '#type' => 'container',
                '#attributes' => [
                    'class' => [
                        'view-changed',
                        'messages',
                        'messages--warning',
                    ],
                ],
                '#children' => $this->t('You have unsaved changes.'),
                '#weight' => -10,
            ];
            if (empty($view->changed)) {
                $form['changed']['#attributes']['class'][] = 'js-hide';
            }
        }
        $form['displays'] = [
            '#prefix' => '<h1 class="unit-title clearfix">' . $this->t('Displays') . '</h1>',
            '#type' => 'container',
            '#attributes' => [
                'class' => [
                    'views-displays',
                ],
            ],
        ];
        $form['displays']['top'] = $this->renderDisplayTop($view);
        // The rest requires a display to be selected.
        if ($display_id) {
            $form_state->set('display_id', $display_id);
            // The part of the page where editing will take place.
            $form['displays']['settings'] = [
                '#type' => 'container',
                '#id' => 'edit-display-settings',
                '#attributes' => [
                    'class' => [
                        'edit-display-settings',
                    ],
                ],
            ];
            // Add a text that the display is disabled.
            if ($view->getExecutable()->displayHandlers
                ->has($display_id)) {
                if (!$view->getExecutable()->displayHandlers
                    ->get($display_id)
                    ->isEnabled()) {
                    $form['displays']['settings']['disabled']['#markup'] = $this->t('This display is disabled.');
                }
            }
            // Add the edit display content
            $tab_content = $this->getDisplayTab($view);
            $tab_content['#theme_wrappers'] = [
                'container',
            ];
            $tab_content['#attributes'] = [
                'class' => [
                    'views-display-tab',
                ],
            ];
            $tab_content['#id'] = 'views-tab-' . $display_id;
            // Mark deleted displays as such.
            $display = $view->get('display');
            if (!empty($display[$display_id]['deleted'])) {
                $tab_content['#attributes']['class'][] = 'views-display-deleted';
            }
            // Mark disabled displays as such.
            if ($view->getExecutable()->displayHandlers
                ->has($display_id) && !$view->getExecutable()->displayHandlers
                ->get($display_id)
                ->isEnabled()) {
                $tab_content['#attributes']['class'][] = 'views-display-disabled';
            }
            $form['displays']['settings']['settings_content'] = [
                '#type' => 'container',
                'tab_content' => $tab_content,
            ];
        }
        return $form;
    }
    
    /**
     * {@inheritdoc}
     */
    protected function actions(array $form, FormStateInterface $form_state) {
        $actions = parent::actions($form, $form_state);
        unset($actions['delete']);
        $actions['cancel'] = [
            '#type' => 'submit',
            '#value' => $this->t('Cancel'),
            '#submit' => [
                '::cancel',
            ],
            '#limit_validation_errors' => [],
        ];
        if ($this->entity
            ->isLocked()) {
            $actions['submit']['#access'] = FALSE;
            $actions['cancel']['#access'] = FALSE;
        }
        return $actions;
    }
    
    /**
     * {@inheritdoc}
     */
    public function validateForm(array &$form, FormStateInterface $form_state) {
        parent::validateForm($form, $form_state);
        $view = $this->entity;
        if ($view->isLocked()) {
            $form_state->setErrorByName('', $this->t('Changes cannot be made to a locked view.'));
        }
        foreach ($view->getExecutable()
            ->validate() as $display_errors) {
            foreach ($display_errors as $error) {
                $form_state->setErrorByName('', $error);
            }
        }
    }
    
    /**
     * {@inheritdoc}
     */
    public function save(array $form, FormStateInterface $form_state) {
        $view = $this->entity;
        $executable = $view->getExecutable();
        $executable->initDisplay();
        // Go through and remove displayed scheduled for removal.
        $displays = $view->get('display');
        foreach ($displays as $id => $display) {
            if (!empty($display['deleted'])) {
                // Remove view display from view attachment under the attachments
                // options.
                $display_handler = $executable->displayHandlers
                    ->get($id);
                if ($attachments = $display_handler->getAttachedDisplays()) {
                    foreach ($attachments as $attachment) {
                        $attached_options = $executable->displayHandlers
                            ->get($attachment)
                            ->getOption('displays');
                        unset($attached_options[$id]);
                        $executable->displayHandlers
                            ->get($attachment)
                            ->setOption('displays', $attached_options);
                    }
                }
                $executable->displayHandlers
                    ->remove($id);
                unset($displays[$id]);
            }
        }
        // Rename display ids if needed.
        foreach ($executable->displayHandlers as $id => $display) {
            if (!empty($display->display['new_id']) && $display->display['new_id'] !== $display->display['id'] && empty($display->display['deleted'])) {
                $new_id = $display->display['new_id'];
                $attachments = $display->getAttachedDisplays();
                $old_id = $display->display['id'];
                $display->display['id'] = $new_id;
                unset($display->display['new_id']);
                $executable->displayHandlers
                    ->set($new_id, $display);
                $displays[$new_id] = $displays[$id];
                unset($displays[$id]);
                // Redirect the user to the renamed display to be sure that the page itself exists and doesn't throw errors.
                $form_state->setRedirect('entity.view.edit_display_form', [
                    'view' => $view->id(),
                    'display_id' => $new_id,
                ]);
                // Find attachments attached to old display id and attach them with new id.
                if ($attachments) {
                    foreach ($attachments as $attachment) {
                        $attached_options = $executable->displayHandlers
                            ->get($attachment)
                            ->getOption('displays');
                        unset($attached_options[$old_id]);
                        $attached_options[$new_id] = $new_id;
                        $executable->displayHandlers
                            ->get($attachment)
                            ->setOption('displays', $attached_options);
                    }
                }
            }
            elseif (isset($display->display['new_id'])) {
                unset($display->display['new_id']);
            }
        }
        $view->set('display', $displays);
        // @todo Revisit this when https://www.drupal.org/node/1668866 is in.
        $query = $this->requestStack
            ->getCurrentRequest()->query;
        $destination = $query->get('destination');
        if (!empty($destination)) {
            // Find out the first display which has a changed path and redirect to this URL.
            $old_view = Views::getView($view->id());
            $old_view->initDisplay();
            foreach ($old_view->displayHandlers as $id => $display) {
                // Only check for displays with a path.
                $old_path = $display->getOption('path');
                if (empty($old_path)) {
                    continue;
                }
                if ($display->getPluginId() == 'page' && $old_path == $destination && $old_path != $view->getExecutable()->displayHandlers
                    ->get($id)
                    ->getOption('path')) {
                    $destination = $view->getExecutable()->displayHandlers
                        ->get($id)
                        ->getOption('path');
                    $query->remove('destination');
                }
            }
            $form_state->setRedirectUrl(Url::fromUri("base:{$destination}"));
        }
        $view->save();
        $this->messenger()
            ->addStatus($this->t('The view %name has been saved.', [
            '%name' => $view->label(),
        ]));
        // Remove this view from cache so we can edit it properly.
        $this->tempStore
            ->delete($view->id());
    }
    
    /**
     * Form submission handler for the 'cancel' action.
     *
     * @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.
     */
    public function cancel(array $form, FormStateInterface $form_state) {
        // Remove this view from cache so edits will be lost.
        $view = $this->entity;
        $this->tempStore
            ->delete($view->id());
        $form_state->setRedirectUrl($this->entity
            ->toUrl('collection'));
    }
    
    /**
     * Returns a renderable array representing the edit page for one display.
     */
    public function getDisplayTab($view) {
        $build = [];
        $display_id = $this->displayID;
        $display = $view->getExecutable()->displayHandlers
            ->get($display_id);
        // If the plugin doesn't exist, display an error message instead of an edit
        // page.
        if (empty($display)) {
            // @todo Improved UX for the case where a plugin is missing.
            $build['#markup'] = $this->t("Error: Display @display refers to a plugin named '@plugin', but that plugin is not available.", [
                '@display' => $display->display['id'],
                '@plugin' => $display->display['display_plugin'],
            ]);
        }
        else {
            $build['details'] = $this->getDisplayDetails($view, $display->display);
        }
        // In AJAX context, ViewUI::rebuildCurrentTab() returns this outside of form
        // context, so hook_form_view_edit_form_alter() is insufficient.
        // @todo remove this after
        //   https://www.drupal.org/project/drupal/issues/3087455 has been resolved.
        $this->moduleHandler
            ->alter('views_ui_display_tab', $build, $view, $display_id);
        // Because themes can implement hook_form_FORM_ID_alter() and because this
        // is a workaround for hook_form_view_edit_form_alter() being insufficient,
        // also invoke this on themes.
        // @todo remove this after
        //   https://www.drupal.org/project/drupal/issues/3087455 has been resolved.
        $this->themeManager
            ->alter('views_ui_display_tab', $build, $view, $display_id);
        return $build;
    }
    
    /**
     * Helper function to get the display details section of the edit UI.
     *
     * @param \Drupal\views_ui\ViewUI $view
     *   The ViewUI entity.
     * @param array $display
     *   The display.
     *
     * @return array
     *   A renderable page build array.
     */
    public function getDisplayDetails($view, $display) {
        $display_title = $this->getDisplayLabel($view, $display['id'], FALSE);
        $build = [
            '#theme_wrappers' => [
                'container',
            ],
            '#attributes' => [
                'id' => 'edit-display-settings-details',
            ],
        ];
        $is_display_deleted = !empty($display['deleted']);
        // The default display cannot be duplicated.
        $is_default = $display['id'] == 'default';
        // @todo Figure out why getOption doesn't work here.
        $is_enabled = $view->getExecutable()->displayHandlers
            ->get($display['id'])
            ->isEnabled();
        if ($display['id'] != 'default') {
            $build['top']['#theme_wrappers'] = [
                'container',
            ];
            $build['top']['#attributes']['id'] = 'edit-display-settings-top';
            $build['top']['#attributes']['class'] = [
                'views-ui-display-tab-actions',
                'edit-display-settings-top',
                'views-ui-display-tab-bucket',
                'clearfix',
            ];
            // The Delete, Duplicate and Undo Delete buttons.
            $build['top']['actions'] = [
                '#theme_wrappers' => [
                    'dropbutton_wrapper',
                ],
            ];
            // Because some of the 'links' are actually submit buttons, we have to
            // manually wrap each item in <li> and the whole list in <ul>.
            $build['top']['actions']['prefix']['#markup'] = '<ul class="dropbutton">';
            if (!$is_display_deleted) {
                if (!$is_enabled) {
                    $build['top']['actions']['enable'] = [
                        '#type' => 'submit',
                        '#value' => $this->t('Enable @display_title', [
                            '@display_title' => $display_title,
                        ]),
                        '#limit_validation_errors' => [],
                        '#submit' => [
                            '::submitDisplayEnable',
                            '::submitDelayDestination',
                        ],
                        '#prefix' => '<li class="enable">',
                        "#suffix" => '</li>',
                    ];
                }
                elseif ($view->status() && $view->getExecutable()->displayHandlers
                    ->get($display['id'])
                    ->hasPath()) {
                    $path = $view->getExecutable()->displayHandlers
                        ->get($display['id'])
                        ->getPath();
                    if ($path && !str_contains($path, '%')) {
                        // Wrap this in a try/catch as trying to generate links to some
                        // routes may throw a NotAcceptableHttpException if they do not
                        // respond to HTML, such as RESTExports.
                        try {
                            if (!parse_url($path, PHP_URL_SCHEME)) {
                                // @todo Views should expect and store a leading /. See:
                                //   https://www.drupal.org/node/2423913
                                $url = Url::fromUserInput('/' . ltrim($path, '/'));
                            }
                            else {
                                $url = Url::fromUri("base:{$path}");
                            }
                        } catch (NotAcceptableHttpException $e) {
                            $url = '/' . $path;
                        }
                        $build['top']['actions']['path'] = [
                            '#type' => 'link',
                            '#title' => $this->t('View @display_title', [
                                '@display_title' => $display_title,
                            ]),
                            '#options' => [
                                'alt' => [
                                    $this->t("Go to the real page for this display"),
                                ],
                            ],
                            '#url' => $url,
                            '#prefix' => '<li class="view">',
                            "#suffix" => '</li>',
                        ];
                    }
                }
                if (!$is_default) {
                    $build['top']['actions']['duplicate'] = [
                        '#type' => 'submit',
                        '#value' => $this->t('Duplicate @display_title', [
                            '@display_title' => $display_title,
                        ]),
                        '#limit_validation_errors' => [],
                        '#submit' => [
                            '::submitDisplayDuplicate',
                            '::submitDelayDestination',
                        ],
                        '#prefix' => '<li class="duplicate">',
                        "#suffix" => '</li>',
                    ];
                }
                // Always allow a display to be deleted.
                $build['top']['actions']['delete'] = [
                    '#type' => 'submit',
                    '#value' => $this->t('Delete @display_title', [
                        '@display_title' => $display_title,
                    ]),
                    '#limit_validation_errors' => [],
                    '#submit' => [
                        '::submitDisplayDelete',
                        '::submitDelayDestination',
                    ],
                    '#prefix' => '<li class="delete">',
                    "#suffix" => '</li>',
                ];
                foreach (Views::fetchPluginNames('display', NULL, [
                    $view->get('storage')
                        ->get('base_table'),
                ]) as $type => $label) {
                    if ($type == $display['display_plugin']) {
                        continue;
                    }
                    $build['top']['actions']['duplicate_as'][$type] = [
                        '#type' => 'submit',
                        '#value' => $this->t('Duplicate as @type', [
                            '@type' => $label,
                        ]),
                        '#limit_validation_errors' => [],
                        '#submit' => [
                            '::submitDuplicateDisplayAsType',
                            '::submitDelayDestination',
                        ],
                        '#prefix' => '<li class="duplicate">',
                        '#suffix' => '</li>',
                    ];
                }
            }
            else {
                $build['top']['actions']['undo_delete'] = [
                    '#type' => 'submit',
                    '#value' => $this->t('Undo delete of @display_title', [
                        '@display_title' => $display_title,
                    ]),
                    '#limit_validation_errors' => [],
                    '#submit' => [
                        '::submitDisplayUndoDelete',
                        '::submitDelayDestination',
                    ],
                    '#prefix' => '<li class="undo-delete">',
                    "#suffix" => '</li>',
                ];
            }
            if ($is_enabled) {
                $build['top']['actions']['disable'] = [
                    '#type' => 'submit',
                    '#value' => $this->t('Disable @display_title', [
                        '@display_title' => $display_title,
                    ]),
                    '#limit_validation_errors' => [],
                    '#submit' => [
                        '::submitDisplayDisable',
                        '::submitDelayDestination',
                    ],
                    '#prefix' => '<li class="disable">',
                    "#suffix" => '</li>',
                ];
            }
            $build['top']['actions']['suffix']['#markup'] = '</ul>';
            // The area above the three columns.
            $build['top']['display_title'] = [
                '#theme' => 'views_ui_display_tab_setting',
                '#description' => $this->t('Display name'),
                '#link' => $view->getExecutable()->displayHandlers
                    ->get($display['id'])
                    ->optionLink($display_title, 'display_title'),
            ];
        }
        $build['columns'] = [];
        $build['columns']['#theme_wrappers'] = [
            'container',
        ];
        $build['columns']['#attributes'] = [
            'id' => 'edit-display-settings-main',
            'class' => [
                'clearfix',
                'views-display-columns',
            ],
        ];
        $build['columns']['first']['#theme_wrappers'] = [
            'container',
        ];
        $build['columns']['first']['#attributes'] = [
            'class' => [
                'views-display-column',
                'first',
            ],
        ];
        $build['columns']['second']['#theme_wrappers'] = [
            'container',
        ];
        $build['columns']['second']['#attributes'] = [
            'class' => [
                'views-display-column',
                'second',
            ],
        ];
        $build['columns']['second']['settings'] = [];
        $build['columns']['second']['header'] = [];
        $build['columns']['second']['footer'] = [];
        $build['columns']['second']['empty'] = [];
        $build['columns']['second']['pager'] = [];
        // The third column buckets are wrapped in details.
        $build['columns']['third'] = [
            '#type' => 'details',
            '#title' => $this->t('Advanced'),
            '#theme_wrappers' => [
                'details',
            ],
            '#attributes' => [
                'class' => [
                    'views-display-column',
                    'third',
                ],
            ],
        ];
        // Collapse the details by default.
        $build['columns']['third']['#open'] = \Drupal::config('views.settings')->get('ui.show.advanced_column');
        // Each option (e.g. title, access, display as grid/table/list) fits into one
        // of several "buckets," or boxes (Format, Fields, Sort, and so on).
        $buckets = [];
        // Fetch options from the display plugin, with a list of buckets they go into.
        $options = [];
        $view->getExecutable()->displayHandlers
            ->get($display['id'])
            ->optionsSummary($buckets, $options);
        // Place each option into its bucket.
        foreach ($options as $id => $option) {
            // Each option self-identifies as belonging in a particular bucket.
            $buckets[$option['category']]['build'][$id] = $this->buildOptionForm($view, $id, $option, $display);
        }
        // Place each bucket into the proper column.
        foreach ($buckets as $id => $bucket) {
            // Let buckets identify themselves as belonging in a column.
            if (isset($bucket['column']) && isset($build['columns'][$bucket['column']])) {
                $column = $bucket['column'];
            }
            else {
                $column = 'third';
            }
            if (isset($bucket['build']) && is_array($bucket['build'])) {
                $build['columns'][$column][$id] = $bucket['build'];
                $build['columns'][$column][$id]['#theme_wrappers'][] = 'views_ui_display_tab_bucket';
                $build['columns'][$column][$id]['#title'] = !empty($bucket['title']) ? $bucket['title'] : '';
                $build['columns'][$column][$id]['#name'] = $id;
            }
        }
        $build['columns']['first']['fields'] = $this->getFormBucket($view, 'field', $display);
        $build['columns']['first']['filters'] = $this->getFormBucket($view, 'filter', $display);
        $build['columns']['first']['sorts'] = $this->getFormBucket($view, 'sort', $display);
        $build['columns']['second']['header'] = $this->getFormBucket($view, 'header', $display);
        $build['columns']['second']['footer'] = $this->getFormBucket($view, 'footer', $display);
        $build['columns']['second']['empty'] = $this->getFormBucket($view, 'empty', $display);
        $build['columns']['third']['relationships'] = $this->getFormBucket($view, 'relationship', $display);
        $build['columns']['third']['arguments'] = $this->getFormBucket($view, 'argument', $display);
        // If there is a contextual filter or a relationship set, expand the
        // Advanced column to display these values to the user.
        if (!empty($build['columns']['third']['relationships']['fields']) || !empty($build['columns']['third']['arguments']['fields'])) {
            $build['columns']['third']['#open'] = TRUE;
        }
        return $build;
    }
    
    /**
     * Submit handler to add a restore a removed display to a view.
     */
    public function submitDisplayUndoDelete($form, FormStateInterface $form_state) {
        $view = $this->entity;
        // Create the new display
        $id = $form_state->get('display_id');
        $displays = $view->get('display');
        $displays[$id]['deleted'] = FALSE;
        $view->set('display', $displays);
        // Store in cache
        $view->cacheSet();
        // Redirect to the top-level edit page.
        $form_state->setRedirect('entity.view.edit_display_form', [
            'view' => $view->id(),
            'display_id' => $id,
        ]);
    }
    
    /**
     * Submit handler to enable a disabled display.
     */
    public function submitDisplayEnable($form, FormStateInterface $form_state) {
        $view = $this->entity;
        $id = $form_state->get('display_id');
        // setOption doesn't work because this would might affect upper displays
        $view->getExecutable()->displayHandlers
            ->get($id)
            ->setOption('enabled', TRUE);
        // Store in cache
        $view->cacheSet();
        // Redirect to the top-level edit page.
        $form_state->setRedirect('entity.view.edit_display_form', [
            'view' => $view->id(),
            'display_id' => $id,
        ]);
    }
    
    /**
     * Submit handler to disable display.
     */
    public function submitDisplayDisable($form, FormStateInterface $form_state) {
        $view = $this->entity;
        $id = $form_state->get('display_id');
        $view->getExecutable()->displayHandlers
            ->get($id)
            ->setOption('enabled', FALSE);
        // Store in cache
        $view->cacheSet();
        // Redirect to the top-level edit page.
        $form_state->setRedirect('entity.view.edit_display_form', [
            'view' => $view->id(),
            'display_id' => $id,
        ]);
    }
    
    /**
     * Submit handler to delete a display from a view.
     */
    public function submitDisplayDelete($form, FormStateInterface $form_state) {
        $view = $this->entity;
        $display_id = $form_state->get('display_id');
        // Mark the display for deletion.
        $displays = $view->get('display');
        $displays[$display_id]['deleted'] = TRUE;
        $view->set('display', $displays);
        $view->cacheSet();
        // Redirect to the top-level edit page. The first remaining display will
        // become the active display.
        $form_state->setRedirectUrl($view->toUrl('edit-form'));
    }
    
    /**
     * Regenerate the current tab for AJAX updates.
     *
     * @param \Drupal\views_ui\ViewUI $view
     *   The view to regenerate its tab.
     * @param \Drupal\Core\Ajax\AjaxResponse $response
     *   The response object to add new commands to.
     * @param string $display_id
     *   The display ID of the tab to regenerate.
     */
    public function rebuildCurrentTab(ViewUI $view, AjaxResponse $response, $display_id) {
        $this->displayID = $display_id;
        if (!$view->getExecutable()
            ->setDisplay('default')) {
            return;
        }
        // Regenerate the main display area.
        $build = $this->getDisplayTab($view);
        $response->addCommand(new HtmlCommand('#views-tab-' . $display_id, $build));
        // Regenerate the top area so changes to display names and order will appear.
        $build = $this->renderDisplayTop($view);
        $response->addCommand(new ReplaceCommand('#views-display-top', $build));
    }
    
    /**
     * Render the top of the display so it can be updated during ajax operations.
     */
    public function renderDisplayTop(ViewUI $view) {
        $display_id = $this->displayID;
        $element['#theme_wrappers'][] = 'views_ui_container';
        $element['#attributes']['class'] = [
            'views-display-top',
            'clearfix',
        ];
        $element['#attributes']['id'] = [
            'views-display-top',
        ];
        // Extra actions for the display
        $element['extra_actions'] = [
            '#type' => 'dropbutton',
            '#attributes' => [
                'id' => 'views-display-extra-actions',
            ],
            '#links' => [
                'edit-details' => [
                    'title' => $this->t('Edit view name/description'),
                    'url' => Url::fromRoute('views_ui.form_edit_details', [
                        'js' => 'nojs',
                        'view' => $view->id(),
                        'display_id' => $display_id,
                    ]),
                    'attributes' => [
                        'class' => [
                            'views-ajax-link',
                        ],
                    ],
                ],
                'analyze' => [
                    'title' => $this->t('Analyze view'),
                    'url' => Url::fromRoute('views_ui.form_analyze', [
                        'js' => 'nojs',
                        'view' => $view->id(),
                        'display_id' => $display_id,
                    ]),
                    'attributes' => [
                        'class' => [
                            'views-ajax-link',
                        ],
                    ],
                ],
                'duplicate' => [
                    'title' => $this->t('Duplicate view'),
                    'url' => $view->toUrl('duplicate-form'),
                ],
                'reorder' => [
                    'title' => $this->t('Reorder displays'),
                    'url' => Url::fromRoute('views_ui.form_reorder_displays', [
                        'js' => 'nojs',
                        'view' => $view->id(),
                        'display_id' => $display_id,
                    ]),
                    'attributes' => [
                        'class' => [
                            'views-ajax-link',
                        ],
                    ],
                ],
            ],
        ];
        if ($view->access('delete')) {
            $element['extra_actions']['#links']['delete'] = [
                'title' => $this->t('Delete view'),
                'url' => $view->toUrl('delete-form'),
            ];
        }
        // Let other modules add additional links here.
        $this->moduleHandler
            ->alter('views_ui_display_top_links', $element['extra_actions']['#links'], $view, $display_id);
        if (isset($view->type) && $view->type != $this->t('Default')) {
            if ($view->type == $this->t('Overridden')) {
                $element['extra_actions']['#links']['revert'] = [
                    'title' => $this->t('Revert view'),
                    'href' => "admin/structure/views/view/{$view->id()}/revert",
                    'query' => [
                        'destination' => $view->toUrl('edit-form')
                            ->toString(),
                    ],
                ];
            }
            else {
                $element['extra_actions']['#links']['delete'] = [
                    'title' => $this->t('Delete view'),
                    'url' => $view->toUrl('delete-form'),
                ];
            }
        }
        // Determine the displays available for editing.
        if ($tabs = $this->getDisplayTabs($view)) {
            if ($display_id) {
                $tabs[$display_id]['#active'] = TRUE;
            }
            $tabs['#prefix'] = '<h2 class="visually-hidden">' . $this->t('Secondary tabs') . '</h2><ul id = "views-display-menu-tabs" class="tabs secondary">';
            $tabs['#suffix'] = '</ul>';
            $element['tabs'] = $tabs;
        }
        // Buttons for adding a new display.
        foreach (Views::fetchPluginNames('display', NULL, [
            $view->get('base_table'),
        ]) as $type => $label) {
            $element['add_display'][$type] = [
                '#type' => 'submit',
                '#value' => $this->t('Add @display', [
                    '@display' => $label,
                ]),
                '#limit_validation_errors' => [],
                '#submit' => [
                    '::submitDisplayAdd',
                    '::submitDelayDestination',
                ],
                '#attributes' => [
                    'class' => [
                        'add-display',
                    ],
                    'data-drupal-dropdown-label' => $label,
                ],
                // Allow JavaScript to remove the 'Add ' prefix from the button label when
                // placing the button in an "Add" dropdown menu.
'#process' => array_merge([
                    'views_ui_form_button_was_clicked',
                ], $this->elementInfo
                    ->getInfoProperty('submit', '#process', [])),
                '#values' => [
                    $this->t('Add @display', [
                        '@display' => $label,
                    ]),
                    $label,
                ],
            ];
        }
        // In AJAX context, ViewUI::rebuildCurrentTab() returns this outside of form
        // context, so hook_form_view_edit_form_alter() is insufficient.
        // @todo remove this after
        //   https://www.drupal.org/project/drupal/issues/3087455 has been resolved.
        $this->moduleHandler
            ->alter('views_ui_display_top', $element, $view, $display_id);
        // Because themes can implement hook_form_FORM_ID_alter() and because this
        // is a workaround for hook_form_view_edit_form_alter() being insufficient,
        // also invoke this on themes.
        // @todo remove this after
        //   https://www.drupal.org/project/drupal/issues/3087455 has been resolved.
        $this->themeManager
            ->alter('views_ui_display_top', $element, $view, $display_id);
        return $element;
    }
    
    /**
     * Submit handler for form buttons that do not complete a form workflow.
     *
     * The Edit View form is a multistep form workflow, but with state managed by
     * the SharedTempStore rather than $form_state->setRebuild(). Without this
     * submit handler, buttons that add or remove displays would redirect to the
     * destination parameter (e.g., when the Edit View form is linked to from a
     * contextual link). This handler can be added to buttons whose form submission
     * should not yet redirect to the destination.
     */
    public function submitDelayDestination($form, FormStateInterface $form_state) {
        $request = $this->requestStack
            ->getCurrentRequest();
        $destination = $request->query
            ->get('destination');
        $redirect = $form_state->getRedirect();
        // If there is a destination, and redirects are not explicitly disabled, add
        // the destination as a query string to the redirect and suppress it for the
        // current request.
        if (isset($destination) && $redirect !== FALSE) {
            // Create a valid redirect if one does not exist already.
            if (!$redirect instanceof Url) {
                $redirect = Url::createFromRequest($request);
            }
            // Add the current destination to the redirect unless one exists already.
            $options = $redirect->getOptions();
            if (!isset($options['query']['destination'])) {
                $options['query']['destination'] = $destination;
                $redirect->setOptions($options);
            }
            $form_state->setRedirectUrl($redirect);
            $request->query
                ->remove('destination');
        }
    }
    
    /**
     * Submit handler to duplicate a display for a view.
     */
    public function submitDisplayDuplicate($form, FormStateInterface $form_state) {
        $view = $this->entity;
        $display_id = $this->displayID;
        // Create the new display.
        $displays = $view->get('display');
        $display = $view->getExecutable()
            ->newDisplay($displays[$display_id]['display_plugin']);
        $new_display_id = $display->display['id'];
        $displays[$new_display_id] = $displays[$display_id];
        $displays[$new_display_id]['id'] = $new_display_id;
        $view->set('display', $displays);
        // By setting the current display the changed marker will appear on the new
        // display.
        $view->getExecutable()->current_display = $new_display_id;
        $view->cacheSet();
        // Redirect to the new display's edit page.
        $form_state->setRedirect('entity.view.edit_display_form', [
            'view' => $view->id(),
            'display_id' => $new_display_id,
        ]);
    }
    
    /**
     * Submit handler to add a display to a view.
     */
    public function submitDisplayAdd($form, FormStateInterface $form_state) {
        $view = $this->entity;
        // Create the new display.
        $parents = $form_state->getTriggeringElement()['#parents'];
        $display_type = array_pop($parents);
        $display = $view->getExecutable()
            ->newDisplay($display_type);
        $display_id = $display->display['id'];
        // A new display got added so the asterisks symbol should appear on the new
        // display.
        $view->getExecutable()->current_display = $display_id;
        $view->cacheSet();
        // Redirect to the new display's edit page.
        $form_state->setRedirect('entity.view.edit_display_form', [
            'view' => $view->id(),
            'display_id' => $display_id,
        ]);
    }
    
    /**
     * Submit handler to Duplicate a display as another display type.
     */
    public function submitDuplicateDisplayAsType($form, FormStateInterface $form_state) {
        
        /** @var \Drupal\views\ViewEntityInterface $view */
        $view = $this->entity;
        $display_id = $this->displayID;
        // Create the new display.
        $parents = $form_state->getTriggeringElement()['#parents'];
        $display_type = array_pop($parents);
        $new_display_id = $view->duplicateDisplayAsType($display_id, $display_type);
        // By setting the current display the changed marker will appear on the new
        // display.
        $view->getExecutable()->current_display = $new_display_id;
        $view->cacheSet();
        // Redirect to the new display's edit page.
        $form_state->setRedirect('entity.view.edit_display_form', [
            'view' => $view->id(),
            'display_id' => $new_display_id,
        ]);
    }
    
    /**
     * Build a renderable array representing one option on the edit form.
     *
     * This function might be more logical as a method on an object, if a suitable
     * object emerges out of refactoring.
     */
    public function buildOptionForm(ViewUI $view, $id, $option, $display) {
        $option_build = [];
        $option_build['#theme'] = 'views_ui_display_tab_setting';
        $option_build['#description'] = $option['title'];
        $option_build['#link'] = $view->getExecutable()->displayHandlers
            ->get($display['id'])
            ->optionLink($option['value'], $id, '', empty($option['desc']) ? '' : $option['desc']);
        $option_build['#links'] = [];
        if (!empty($option['links']) && is_array($option['links'])) {
            foreach ($option['links'] as $link_id => $link_value) {
                $option_build['#settings_links'][] = $view->getExecutable()->displayHandlers
                    ->get($display['id'])
                    ->optionLink($option['setting'], $link_id, 'views-button-configure', $link_value);
            }
        }
        if (!empty($view->getExecutable()->displayHandlers
            ->get($display['id'])->options['defaults'][$id])) {
            $display_id = 'default';
            $option_build['#defaulted'] = TRUE;
        }
        else {
            $display_id = $display['id'];
            if (!$view->getExecutable()->displayHandlers
                ->get($display['id'])
                ->isDefaultDisplay()) {
                if ($view->getExecutable()->displayHandlers
                    ->get($display['id'])
                    ->defaultableSections($id)) {
                    $option_build['#overridden'] = TRUE;
                }
            }
        }
        $option_build['#attributes']['class'][] = Html::cleanCssIdentifier($display_id . '-' . $id);
        return $option_build;
    }
    
    /**
     * Add information about a section to a display.
     */
    public function getFormBucket(ViewUI $view, $type, $display) {
        $executable = $view->getExecutable();
        $executable->setDisplay($display['id']);
        $executable->initStyle();
        $types = $executable->getHandlerTypes();
        $build = [
            '#theme_wrappers' => [
                'views_ui_display_tab_bucket',
            ],
        ];
        $build['#overridden'] = FALSE;
        $build['#defaulted'] = FALSE;
        $build['#name'] = $type;
        $build['#title'] = $types[$type]['title'];
        $rearrange_url = Url::fromRoute('views_ui.form_rearrange', [
            'js' => 'nojs',
            'view' => $view->id(),
            'display_id' => $display['id'],
            'type' => $type,
        ]);
        $class = 'icon compact rearrange';
        // Different types now have different rearrange forms, so we use this switch
        // to get the right one.
        switch ($type) {
            case 'filter':
                // The rearrange form for filters contains the and/or UI, so override
                // the used path.
                $rearrange_url = Url::fromRoute('views_ui.form_rearrange_filter', [
                    'js' => 'nojs',
                    'view' => $view->id(),
                    'display_id' => $display['id'],
                ]);
                // @todo Add another class to have another symbol for filter rearrange.
                $class = 'icon compact rearrange';
                break;
            case 'field':
                // Fetch the style plugin info so we know whether to list fields or not.
                $style_plugin = $executable->style_plugin;
                $uses_fields = $style_plugin && $style_plugin->usesFields();
                if (!$uses_fields) {
                    $build['fields'][] = [
                        '#markup' => $this->t('The selected style or row format does not use fields.'),
                        '#theme_wrappers' => [
                            'views_ui_container',
                        ],
                        '#attributes' => [
                            'class' => [
                                'views-display-setting',
                            ],
                        ],
                    ];
                    return $build;
                }
                break;
            case 'header':
            case 'footer':
            case 'empty':
                if (!$executable->display_handler
                    ->usesAreas()) {
                    $build[$type][] = [
                        '#markup' => $this->t('The selected display type does not use @type plugins', [
                            '@type' => $type,
                        ]),
                        '#theme_wrappers' => [
                            'views_ui_container',
                        ],
                        '#attributes' => [
                            'class' => [
                                'views-display-setting',
                            ],
                        ],
                    ];
                    return $build;
                }
                break;
        }
        // Create an array of actions to pass to links template.
        $actions = [];
        $count_handlers = count($executable->display_handler
            ->getHandlers($type));
        // Create the add text variable for the add action.
        $add_text = $this->t('Add <span class="visually-hidden">@type</span>', [
            '@type' => $types[$type]['ltitle'],
        ]);
        $actions['add'] = [
            'title' => $add_text,
            'url' => Url::fromRoute('views_ui.form_add_handler', [
                'js' => 'nojs',
                'view' => $view->id(),
                'display_id' => $display['id'],
                'type' => $type,
            ]),
            'attributes' => [
                'class' => [
                    'icon compact add',
                    'views-ajax-link',
                ],
                'id' => 'views-add-' . $type,
            ],
        ];
        if ($count_handlers > 0) {
            // Create the rearrange text variable for the rearrange action.
            $rearrange_text = $type == 'filter' ? $this->t('And/Or Rearrange <span class="visually-hidden">filter criteria</span>') : $this->t('Rearrange <span class="visually-hidden">@type</span>', [
                '@type' => $types[$type]['ltitle'],
            ]);
            $actions['rearrange'] = [
                'title' => $rearrange_text,
                'url' => $rearrange_url,
                'attributes' => [
                    'class' => [
                        $class,
                        'views-ajax-link',
                    ],
                    'id' => 'views-rearrange-' . $type,
                ],
            ];
        }
        // Render the array of links
        $build['#actions'] = [
            '#type' => 'dropbutton',
            '#links' => $actions,
            '#attributes' => [
                'class' => [
                    'views-ui-settings-bucket-operations',
                ],
            ],
        ];
        if (!$executable->display_handler
            ->isDefaultDisplay()) {
            if (!$executable->display_handler
                ->isDefaulted($types[$type]['plural'])) {
                $build['#overridden'] = TRUE;
            }
            else {
                $build['#defaulted'] = TRUE;
            }
        }
        static $relationships = NULL;
        if (!isset($relationships)) {
            // Get relationship labels.
            $relationships = [];
            foreach ($executable->display_handler
                ->getHandlers('relationship') as $id => $handler) {
                $relationships[$id] = $handler->adminLabel();
            }
        }
        // Filters can now be grouped so we do a little bit extra:
        $groups = [];
        $grouping = FALSE;
        if ($type == 'filter') {
            $group_info = $executable->display_handler
                ->getOption('filter_groups');
            // If there is only one group but it is using the "OR" filter, we still
            // treat it as a group for display purposes, since we want to display the
            // "OR" label next to items within the group.
            if (!empty($group_info['groups']) && (count($group_info['groups']) > 1 || current($group_info['groups']) == 'OR')) {
                $grouping = TRUE;
                $groups = [
                    0 => [],
                ];
            }
        }
        $build['fields'] = [];
        foreach ($executable->display_handler
            ->getOption($types[$type]['plural']) as $id => $field) {
            // Build the option link for this handler ("Node: ID = article").
            $build['fields'][$id] = [];
            $build['fields'][$id]['#theme'] = 'views_ui_display_tab_setting';
            $handler = $executable->display_handler
                ->getHandler($type, $id);
            if ($handler->broken()) {
                $build['fields'][$id]['#class'][] = 'broken';
                $field_name = $handler->adminLabel();
                $build['fields'][$id]['#link'] = Link::fromTextAndUrl($field_name, new Url('views_ui.form_handler', [
                    'js' => 'nojs',
                    'view' => $view->id(),
                    'display_id' => $display['id'],
                    'type' => $type,
                    'id' => $id,
                ], [
                    'attributes' => [
                        'class' => [
                            'views-ajax-link',
                        ],
                    ],
                ]))
                    ->toString();
                continue;
            }
            $field_name = $handler->adminLabel(TRUE);
            if (!empty($field['relationship']) && !empty($relationships[$field['relationship']])) {
                $field_name = '(' . $relationships[$field['relationship']] . ') ' . $field_name;
            }
            $description = $handler->adminSummary();
            $link_text = $field_name . (empty($description) ? '' : " ({$description})");
            $link_attributes = [
                'class' => [
                    'views-ajax-link',
                ],
            ];
            if (!empty($field['exclude'])) {
                $link_attributes['class'][] = 'views-field-excluded';
                // Add a [hidden] marker, if the field is excluded.
                $link_text .= ' [' . $this->t('hidden') . ']';
            }
            $build['fields'][$id]['#link'] = Link::fromTextAndUrl($link_text, new Url('views_ui.form_handler', [
                'js' => 'nojs',
                'view' => $view->id(),
                'display_id' => $display['id'],
                'type' => $type,
                'id' => $id,
            ], [
                'attributes' => $link_attributes,
            ]))
                ->toString();
            $build['fields'][$id]['#class'][] = Html::cleanCssIdentifier($display['id'] . '-' . $type . '-' . $id);
            if ($executable->display_handler
                ->useGroupBy() && $handler->usesGroupBy()) {
                $build['fields'][$id]['#settings_links'][] = Link::fromTextAndUrl(new FormattableMarkup('<span class="label">@text</span>', [
                    '@text' => $this->t('Aggregation settings'),
                ]), new Url('views_ui.form_handler_group', [
                    'js' => 'nojs',
                    'view' => $view->id(),
                    'display_id' => $display['id'],
                    'type' => $type,
                    'id' => $id,
                ], [
                    'attributes' => [
                        'class' => [
                            'views-button-configure',
                            'views-ajax-link',
                        ],
                        'title' => $this->t('Aggregation settings'),
                    ],
                ]))
                    ->toString();
            }
            if ($handler->hasExtraOptions()) {
                $build['fields'][$id]['#settings_links'][] = Link::fromTextAndUrl(new FormattableMarkup('<span class="label">@text</span>', [
                    '@text' => $this->t('Settings'),
                ]), new Url('views_ui.form_handler_extra', [
                    'js' => 'nojs',
                    'view' => $view->id(),
                    'display_id' => $display['id'],
                    'type' => $type,
                    'id' => $id,
                ], [
                    'attributes' => [
                        'class' => [
                            'views-button-configure',
                            'views-ajax-link',
                        ],
                        'title' => $this->t('Settings'),
                    ],
                ]))
                    ->toString();
            }
            if ($grouping) {
                $gid = $handler->options['group'];
                // Show in default group if the group does not exist.
                if (empty($group_info['groups'][$gid])) {
                    $gid = 0;
                }
                $groups[$gid][] = $id;
            }
        }
        // If using grouping, re-order fields so that they show up properly in the list.
        if ($type == 'filter' && $grouping) {
            $store = $build['fields'];
            $build['fields'] = [];
            foreach ($groups as $gid => $contents) {
                // Display an operator between each group.
                if (!empty($build['fields'])) {
                    $build['fields'][] = [
                        '#theme' => 'views_ui_display_tab_setting',
                        '#class' => [
                            'views-group-text',
                        ],
                        '#link' => $group_info['operator'] == 'OR' ? $this->t('OR') : $this->t('AND'),
                    ];
                }
                // Display an operator between each pair of filters within the group.
                $keys = array_keys($contents);
                $last = end($keys);
                foreach ($contents as $key => $pid) {
                    if ($key != $last) {
                        $operator = $group_info['groups'][$gid] == 'OR' ? $this->t('OR') : $this->t('AND');
                        $store[$pid]['#link'] = new FormattableMarkup('@link <span>@operator</span>', [
                            '@link' => $store[$pid]['#link'],
                            '@operator' => $operator,
                        ]);
                    }
                    $build['fields'][$pid] = $store[$pid];
                }
            }
        }
        return $build;
    }

}