subpagelist.php

<?php
/**
 * Field plugin Subpagelist
 *
 * @package   Kirby CMS
 * @author    Flo Kosiol <git@flokosiol.de>
 * @link      http://flokosiol.de
 * @version   customized version for https://github.com/flokosiol/kirby-subpagelist/issues/6
 */

class SubpagelistField extends BaseField {

  const LANG_DIR = 'languages';

  /**
   * Assets
   */
  public static $assets = array(
    'css' => array(
      'subpagelist.css',
    ),
  );


  /**
   * Constructor
   */
  public function __construct() {
    
    $baseDir = __DIR__ . DS . self::LANG_DIR . DS;
    $lang    = panel()->language();
    
    if (file_exists($baseDir . $lang . '.php')) {
      require $baseDir . $lang . '.php';
    } 
    else {
      require $baseDir . 'en.php';
    }

  }

  /**
   * Set field property and default value if required
   *
   * @param string $option
   * @param mixed  $value
   */
  public function __set($option, $value) {
      
    /* Set given value */
    $this->$option = $value;

    /* Validation */
    switch($option) {
      case 'flip':
        if(!is_bool($value))
          $this->flip = false;
        break;          
    }
  }
    
  /**
   * Generate label markup
   *
   * @return string
   */
  public function label() {
    
    $label = parent::label();
    $label->addClass('hgroup-title');
    
    return $label;

  }

  /**
   * Generate field content markup
   *
   * @return string
   */
  public function content() {

    $wrapper = new Brick('div');
    $wrapper->addClass('subpagelist');

    $children = $this->subpages();
    
    // add pagination to the subpages
    $limit = ($this->limit()) ? $this->limit() : 1000;
    $children = $children->paginate($limit, array('page' => get('page')));

    // use custom template instead of existing snippet
    $wrapper->html(tpl::load(__DIR__ . DS . 'template.php', array(
      'title'      => l('pages.show.subpages.title'),
      'page'       => $this->page(),
      'subpages'   => $children,
      'addbutton'  => !api::maxPages($this, $this->subpages()->max()),
      'pagination' => $children->pagination(),
    )));

    return $wrapper;

  }


  /**
   * Get subpages
   *
   * @return object
   */
  public function subpages() {

    $field = &$this;
    $subpages = $this->page()->children();

    if (isset($this->flip) && $this->flip == TRUE) {
      $subpages = $subpages->flip();
    } 

    return $subpages;
  }

}

template.php

<?php if ($subpages()->count() > 0): ?>

  <?php 
    # copy and paste the sidebar subpages snippet from here: panel/app/snippets/pages/sidebar/subpages.php
    # inside this code replace the snippet for a single subpage (new Snippet('pages/sidebar/subpage', array('subpage' => $subpage)))
    # with the content of this file: panel/app/snippets/pages/sidebar/subpage.php
    # adjust the template as you like
  ?>

<?php else: ?>
  
  <div class="input input-with-items">
    <div class="item subpagelist-item-empty">
      <?php echo l::get('subpagelist.empty') ?>
    </div>
  </div>
  
<?php endif ?>