Current File : /home2/selectio/www/bharath/a1tex.in/vendor/dompdf/dompdf/src/Frame/FrameListIterator.php
<?php
/**
* @package dompdf
* @link https://github.com/dompdf/dompdf
* @license http://www.gnu.org/copyleft/lesser.html GNU Lesser General Public License
*/
namespace Dompdf\Frame;
use Iterator;
use Dompdf\Frame;
/**
* Linked-list Iterator
*
* Returns children in order and allows for the list to change during iteration,
* provided the changes occur to or after the current element.
*
* @package dompdf
*/
class FrameListIterator implements Iterator
{
/**
* @var Frame
*/
protected $parent;
/**
* @var Frame|null
*/
protected $cur;
/**
* @var Frame|null
*/
protected $prev;
/**
* @var int
*/
protected $num;
/**
* @param Frame $frame
*/
public function __construct(Frame $frame)
{
$this->parent = $frame;
$this->rewind();
}
public function rewind(): void
{
$this->cur = $this->parent->get_first_child();
$this->prev = null;
$this->num = 0;
}
/**
* @return bool
*/
public function valid(): bool
{
return $this->cur !== null;
}
/**
* @return int
*/
public function key(): int
{
return $this->num;
}
/**
* @return Frame|null
*/
public function current(): ?Frame
{
return $this->cur;
}
public function next(): void
{
if ($this->cur === null) {
return;
}
if ($this->cur->get_parent() === $this->parent) {
$this->prev = $this->cur;
$this->cur = $this->cur->get_next_sibling();
$this->num++;
} else {
// Continue from the previous child if the current frame has been
// moved to another parent
$this->cur = $this->prev !== null
? $this->prev->get_next_sibling()
: $this->parent->get_first_child();
}
}
}
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