#drupal Experimental Block Rendering by Device. Drupal 7

Drupal Blocks with Mobile Detect

<?php

/**
 * @file
 * A test case for adding visibility settings of Desktop, Tablet and Mobile to Drupal block rendering. Dropped instead for Context + Mobile Detect Library
 */
define('MOBILE_DETECT_LIBRARY_PATH', '/sites/all/libraries/Mobile_Detect');

/**
 * Implements hook_form_alter().
 */
function example_device_blocks_form_alter(&$form, &$form_state, $form_id) {
  if (in_array($form_id, array('block_admin_configure', 'block_add_block_form', 'menu_block_add_block_form'))) {
    // If the user is a site admin, show the form, otherwise pass it silently.

    if (isset($form['module']['#value'])) {
      $module = $form['module']['#value'];
      $delta = $form['delta']['#value'];
    }
    else {
      $module = 'block';
      $delta = $form['bid']['#value'];
    }
    $form['visibility']['device_filter_settings'] = array(
      '#type' => 'fieldset',
      '#title' => t('Device Display Options'),
      '#collapsible' => TRUE,
      '#collapsed' => FALSE,
      '#weight' => 0,
      '#group' => 'visibility',
    );
    $device_options = array();


    $previous_device_options = _example_device_blocks_load($module, $delta, FALSE, '');

    if (count($previous_device_options) > 0) {
      foreach ($previous_device_options as $value) {
        $device_options[] = $value;
      }
    }

    $options = array('smalltouch' => 'Smalltouch Devices', 'tablet' => 'Tablet Devices', 'non_mobile' => 'PC/Laptop Devices');

    $form['visibility']['device_filter_settings']['device_types'] = array(
      '#type' => 'checkboxes',
      '#title' => t('Hide on'),
      '#options' => $options,
      '#required' => FALSE,
      '#description' => t('Limit block display to selected device types. When no device types are selected this block is visible on '
          . 'all devices by default. Device detection through Mobile Detect module and not CSS Media Queries.'),
      '#default_value' => $device_options,
    );

    $form['visibility']['device_filter_settings']['previous_device_options'] = array(
      '#type' => 'value',
      '#value' => $previous_device_options,
    );
    $form['#submit'][] = 'example_device_blocks_form_submit';
  }
  // Submit handler for user defined block deletion
  if ($form_id == 'block_custom_block_delete') {
    $form['#submit'][] = 'example_device_blocks_delete_submit';
  }
}

/**
 * Returns block visibility.
 * @param string $module
 * @param int $delta
 */
function _example_device_blocks_load($module, $delta, $filter = FALSE, $current_device = '') {
  $block = NULL;
  if ($filter) {
    $result = db_query("SELECT device_type FROM {example_device_blocks} WHERE module = :module AND delta = :delta AND device_type = :device_type", array(':module' => $module, ':delta' => $delta, ':device_type' => $current_device));
  }
  else {
    $result = db_query("SELECT device_type FROM {example_device_blocks} WHERE module = :module AND delta = :delta", array(':module' => $module, ':delta' => $delta));
  }
  foreach ($result as $record) {
    $block[] = $record->device_type;
  }

  return $block;
}

/**
 * Forms API submit callback called from domain_blocks_form_alter().
 */
function example_device_blocks_form_submit($form, &$form_state) {
  $values = $form_state['values'];
  if (!isset($values['module'])) {
    $values['module'] = 'block';
  }
  if (!isset($values['delta'])) {
    $values['delta'] = $values['bid'];
  }
  // Delta may be zero for other modules than block.
  if (!$values['delta'] && $values['module'] == 'block') {
    $values['delta'] = db_query("SELECT MAX(bid) FROM {block_custom}")->fetchField();
  }
  $device_types = array();

  if (!empty($values['device_types'])) {
    foreach ($values['device_types'] as $device_types_name => $device_type) {
      if (!empty($device_type)) {
        $device_types[] = $device_type;
      }
    }
  }

  example_device_blocks_save($values['module'], $values['delta'], $device_types, $values['previous_device_options']);
}

/**
 * Submit handler for user defined block deletion
 */
function example_device_blocks_delete_submit($form, &$form_state) {
  db_delete('example_device_blocks')
      ->condition('module', 'block')
      ->condition('delta', $form_state['values']['bid'])
      ->execute();
}

/**
 * @param string $module
 * @param string $delta
 */
function example_device_blocks_save($module, $delta, $device_types, $previous_device_types) {
  if (empty($device_types)) {
    if (!empty($previous_device_types)) {
      db_delete('example_device_blocks')
          ->condition('module', $module)
          ->condition('delta', $delta)
          ->execute();
    }
  }
  else {
    if (empty($previous_device_types)) {
      db_delete('example_device_blocks')
          ->condition('module', $module)
          ->condition('delta', $delta)
          ->execute();
      foreach ($device_types as $device_type) {
        $id = db_insert('example_device_blocks')
            ->fields(array(
              'module' => $module,
              'delta' => $delta,
              'device_type' => $device_type,
            ))
            ->execute();
      }
    }
    else {
      $devices_to_be_removed = array_diff($previous_device_types, $device_types);
      if (!empty($devices_to_be_removed)) {
        if (isset($devices_to_be_removed)) {
          db_delete('example_device_blocks')
              ->condition('module', $module)
              ->condition('delta', $delta)
              ->condition('device_type', $devices_to_be_removed, 'IN')
              ->execute();
        }
      }
      $devices_to_be_added = array_diff($device_types, $previous_device_types);
      if (!empty($devices_to_be_added)) {
        foreach ($devices_to_be_added as $device_type) {
          $id = db_insert('example_device_blocks')
              ->fields(array(
                'module' => $module,
                'delta' => $delta,
                'device_type' => $device_type,
              ))
              ->execute();
        }
      }
    }
  }
}

/**
 * Implements hook_block_list_alter().
 * @param type $blocks
 */
function example_device_blocks_block_list_alter(&$blocks) {
  if (!path_is_admin(current_path())) {
    $browser = _example_device_blocks_get_browser();
    $current_device = '';
    if ($browser['is_mobile']) {
      $current_device = 'smalltouch';
    }
    if ($browser['is_tablet']) {
      $current_device = 'tablet';
    }
    if ($browser['is_desktop']) {
      $current_device = 'non_mobile';
    }
    if ($browser['is_mobile'] || $browser['is_tablet'] || $browser['is_desktop']) {
      foreach ($blocks as $key => $block) {
        if ($block->region != -1) {
          $device_options = _example_device_blocks_load($block->module, $block->delta, TRUE, $current_device);
          if (!empty($device_options)) {
            unset($blocks[$key]);
          }
        }
      }
    }
  }
}

/**
 * Return a device context.
 * Wrapper for mobile_detect_get_object()
 */
function _example_device_blocks_get_browser($setcookie = FALSE) {
  $browser['is_mobile'] = NULL;
  $browser['is_tablet'] = NULL;
  $browser['is_desktop'] = NULL;
  $browser['md_debug'] = NULL;
  $browser['current_device'] = 'undetected';
  if (!isset($_COOKIE['current_device']) || $_COOKIE['current_device'] == 'undetected') {
    if (function_exists('mobile_detect_get_object')) {
      $detect = mobile_detect_get_object();
      if ($detect) {
        $browser['md_debug'] = $detect;
        $browser['is_mobile'] = $detect->isMobile();
        $browser['is_tablet'] = $detect->isTablet();
        if (!$browser['is_tablet'] && !$browser['is_mobile']) {
          $browser['is_desktop'] = TRUE;
        }

        if ($browser['is_mobile']) {
          $browser['current_device'] = 'smalltouch';
        }
        if ($browser['is_tablet']) {
          $browser['current_device'] = 'tablet';
        }
        if ($browser['is_desktop']) {
          $browser['current_device'] = 'non_mobile';
        }
      }
    }
    if ($setcookie) {
      $params = session_get_cookie_params();
      setcookie("md_debug", $browser['md_debug'], REQUEST_TIME + 7200, $params['path'], $params['domain'], $params['secure'], $params['httponly']);
      setcookie("current_device", $browser['current_device'], REQUEST_TIME + 7200, $params['path'], $params['domain'], $params['secure'], $params['httponly']);
      setcookie("is_mobile", $browser['is_mobile'], REQUEST_TIME + 7200, $params['path'], $params['domain'], $params['secure'], $params['httponly']);
      setcookie("is_tablet", $browser['is_tablet'], REQUEST_TIME + 7200, $params['path'], $params['domain'], $params['secure'], $params['httponly']);
      setcookie("is_desktop", $browser['is_desktop'], REQUEST_TIME + 7200, $params['path'], $params['domain'], $params['secure'], $params['httponly']);
    }
  }
  else {
    $browser['current_device'] = isset($_COOKIE['current_device']) ? $_COOKIE['current_device'] : $browser['current_device'];
    $browser['md_debug'] = isset($_COOKIE['md_debug']) ? $_COOKIE['md_debug'] : $browser['md_debug'];
    $browser['is_mobile'] = isset($_COOKIE['is_mobile']) ? $_COOKIE['is_mobile'] : $browser['is_mobile'];
    $browser['is_tablet'] = isset($_COOKIE['is_tablet']) ? $_COOKIE['is_tablet'] : $browser['is_tablet'];
    $browser['is_desktop'] = isset($_COOKIE['is_desktop']) ? $_COOKIE['is_desktop'] : $browser['is_desktop'];
  }

  return $browser;
}

/**
 * Called via settings.inc; needs to be added to settings.php manually.
 */
function example_device_blocks_mobile_detect_preboot() {
  $browser = _example_device_blocks_get_browser(TRUE);
  if (is_array($browser)) {
    _example_device_blocks_add_query_string('device=' . $browser['current_device']);
  }
}

function _example_device_blocks_add_query_string($str) {
  if (isset($_SERVER['REQUEST_URI'])) {
    if (strpos($_SERVER['REQUEST_URI'], '?') === FALSE) {
      $_SERVER['REQUEST_URI'] .= ('?' . $str);
    }
    else {
      $_SERVER['REQUEST_URI'] .= ('&' . $str);
    }
  }
}