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<?php
namespace Dompdf\Frame;
use Iterator;
use Dompdf\Frame;
/**
* Pre-order Iterator
*
* Returns frames in preorder traversal order (parent then children)
*
* @access private
* @package dompdf
*/
class FrameTreeIterator implements Iterator
{
/**
* @var Frame
*/
protected $_root;
/**
* @var array
*/
protected $_stack = [];
/**
* @var int
*/
protected $_num;
/**
* @param Frame $root
*/
public function __construct(Frame $root)
{
$this->_stack[] = $this->_root = $root;
$this->_num = 0;
}
/**
*
*/
public function rewind()
{
$this->_stack = [$this->_root];
$this->_num = 0;
}
/**
* @return bool
*/
public function valid()
{
return count($this->_stack) > 0;
}
/**
* @return int
*/
public function key()
{
return $this->_num;
}
/**
* @return Frame
*/
public function current()
{
return end($this->_stack);
}
/**
* @return Frame
*/
public function next()
{
$b = end($this->_stack);
// Pop last element
unset($this->_stack[key($this->_stack)]);
$this->_num++;
// Push all children onto the stack in reverse order
if ($c = $b->get_last_child()) {
$this->_stack[] = $c;
while ($c = $c->get_prev_sibling()) {
$this->_stack[] = $c;
}
}
return $b;
}
}
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