Issue #2749583 by jigarius, FiNeX, crutch, Jeff Burnz, mlncn, tedbow: Remove hook_toolbar()

<?php

/**

 * @file

 * Contains hooks.

 */

use Drupal\Component\Serialization\Json;

use Drupal\Core\Url;

/**

 * Implements hook_toolbar().

 */

function block_visibility_groups_admin_toolbar() {

  $route = \Drupal::routeMatch();

  $json_params = Json::encode($route->getRawParameters()->all());

  $encoded_parameters = urlencode($json_params);

  /** @var \Drupal\block_visibility_groups_admin\GroupInfo $group_info */

  $group_info = \Drupal::getContainer()

    ->get('block_visibility_groups_admin.lister');

  if ($active_groups = $group_info->getActiveGroups()) {

    $url = Url::fromRoute('block_visibility_groups_admin.active_groups',

      [

        'active_group_ids' => implode(',', array_keys($active_groups)),

      ]

    );

    $link_title = t('Manage Active Groups');

  }

  else {

    // No active Groups.

    $url = Url::fromRoute('block_visibility_groups_admin.group_create',

      [

        'route_name' => $route->getRouteName(),

        'parameters' => $encoded_parameters,

      ]

    );

    $link_title = t('Create new visibility Group');

  }

  $items['block_visibility_groups_admin'] = [

    '#type' => 'toolbar_item',

    'tab' => [

      '#type' => 'link',

      '#title' => t('Block Visibility Groups'),

      '#url' => $url,

      '#attributes' => [

        'title' => $link_title,

        'data-dialog-type' => 'modal',

        'data-dialog-options' => Json::encode([

          'width' => 700,

        ]),

        'class' => ['toolbar-icon', 'use-ajax'],

      ],

    ],

    // @todo Fix caching

    '#cache' => [

      'max-age' => 0,

    ],

  ];

  return $items;

}