<?php
  namespace Dompdf\Frame;
  
  use IteratorAggregate;
  use Dompdf\Frame;
  
  /**
   * Pre-order IteratorAggregate
   *
   * @access private
   * @package dompdf
   */
  class FrameTreeList implements IteratorAggregate
  {
      /**
       * @var \Dompdf\Frame
       */
      protected $_root;
  
      /**
       * @param \Dompdf\Frame $root
       */
      public function __construct(Frame $root)
      {
          $this->_root = $root;
      }
  
      /**
       * @return FrameTreeIterator
       */
      public function getIterator()
      {
          return new FrameTreeIterator($this->_root);
      }
  }