PageUrlQrCodeBlock.php in Page URL QR Code Block 8

Contains \Drupal\page_url_qr_code_block\Plugin\Block\page_url_qr_code_block.

Namespace

Drupal\page_url_qr_code_block\Plugin\Block

File

src/Plugin/Block/PageUrlQrCodeBlock.php

<?php

/**
 * @file
 * Contains \Drupal\page_url_qr_code_block\Plugin\Block\page_url_qr_code_block.
 */
namespace Drupal\page_url_qr_code_block\Plugin\Block;

use Drupal\Core\Block\BlockBase;
use Drupal\Core\Block\BlockPluginInterface;
use Drupal\Core\Form\FormStateInterface;

/**
 * Provides my custom block.
 *
 * @Block(
 *   id = "page_url_qr_code_block",
 *   admin_label = @Translation("Page URL QR Code"),
 *   category = @Translation("Blocks")
 * )
 */
class PageUrlQrCodeBlock extends BlockBase implements BlockPluginInterface {

  /**
   * Constructs a new BookNavigationBlock instance.
   *
   * @param array $configuration
   *   A configuration array containing information about the plugin instance.
   * @param string $plugin_id
   *   The plugin_id for the plugin instance.
   * @param mixed $plugin_definition
   *   The plugin implementation definition.
   */
  public function __construct(array $configuration, $plugin_id, $plugin_definition) {
    parent::__construct($configuration, $plugin_id, $plugin_definition);
  }

  /**
   * {@inheritdoc}
   */
  public function defaultConfiguration() {
    $default_config = \Drupal::config('page_url_qr_code_block.settings');
    return array(
      'page_url_qr_code_caption' => $default_config
        ->get('page_url_qr_code_block.page_url_qr_code_caption'),
      'page_url_qr_code_alt' => $default_config
        ->get('page_url_qr_code_block.page_url_qr_code_alt'),
      'page_url_qr_code_width_height' => $default_config
        ->get('page_url_qr_code_block.page_url_qr_code_width_height'),
      'page_url_qr_code_api' => $default_config
        ->get('page_url_qr_code_block.page_url_qr_code_api'),
    );
  }

  /**
   * {@inheritdoc}
   */
  function blockForm($form, FormStateInterface $form_state) {
    $form = parent::blockForm($form, $form_state);
    $config = $this
      ->getConfiguration();
    $form['page_url_qr_code_caption'] = array(
      '#type' => 'textfield',
      '#title' => t('Caption'),
      '#description' => t('Will display under the QR Code'),
      '#default_value' => isset($config['page_url_qr_code_caption']) ? $config['page_url_qr_code_caption'] : 'Page URL',
    );
    $form['page_url_qr_code_alt'] = array(
      '#type' => 'textfield',
      '#title' => t('Alt Text'),
      '#default_value' => isset($config['page_url_qr_code_alt']) ? $config['page_url_qr_code_alt'] : 'QR code for this page URL',
    );
    $form['page_url_qr_code_width_height'] = array(
      '#type' => 'textfield',
      '#title' => t('QR Code Width & Height'),
      '#description' => t('Width & Height will be same. i.e. 150'),
      '#default_value' => isset($config['page_url_qr_code_width_height']) ? $config['page_url_qr_code_width_height'] : '150',
    );
    $form['page_url_qr_code_api'] = array(
      '#type' => 'radios',
      '#title' => t('Select API'),
      '#description' => t('Select other API where Google is restricted'),
      '#options' => array(
        'google' => 'Google API (recommended)',
        'liantu' => 'Liantu API',
      ),
      '#default_value' => isset($config['page_url_qr_code_api']) ? $config['page_url_qr_code_api'] : 'google',
    );
    return $form;
  }

  /**
   * {@inheritdoc}
   */
  public function blockSubmit($form, FormStateInterface $form_state) {
    $this->configuration['page_url_qr_code_caption'] = $form_state
      ->getValue('page_url_qr_code_caption');
    $this->configuration['page_url_qr_code_alt'] = $form_state
      ->getValue('page_url_qr_code_alt');
    $this->configuration['page_url_qr_code_width_height'] = $form_state
      ->getValue('page_url_qr_code_width_height');
    $this->configuration['page_url_qr_code_api'] = $form_state
      ->getValue('page_url_qr_code_api');
  }

  /**
   * {@inheritdoc}
   */
  public function build() {
    global $base_url;
    $path = \Drupal::request()
      ->getRequestUri();
    $path = \Drupal::service('path.alias_manager')
      ->getAliasByPath($path);
    $width = $this->configuration['page_url_qr_code_width_height'];
    $api = $this->configuration['page_url_qr_code_api'];
    $page_url = urlencode($base_url . $path);
    if ('liantu' == $api) {
      $url = "//qr.liantu.com/api.php?bg=ffffff&w={$width}&text={$page_url}";
    }
    else {
      $url = "//chart.apis.google.com/chart?chs={$width}x{$width}&cht=qr&chl={$page_url}";
    }
    return array(
      '#theme' => 'page_url_qr_code_block',
      '#url' => $url,
      '#alt' => $this->configuration['page_url_qr_code_alt'],
      '#width' => $width,
      '#height' => $this->configuration['page_url_qr_code_width_height'],
      '#caption' => $this->configuration['page_url_qr_code_caption'],
      '#attached' => array(
        'library' => array(
          'page_url_qr_code_block/page_url_qr_code_block_style',
        ),
      ),
      '#cache' => [
        'contexts' => [
          'url',
        ],
        'max-age' => 0,
      ],
    );
  }

}

Classes

Name	Description
PageUrlQrCodeBlock	Provides my custom block.