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<?php |
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/** |
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* @package dompdf |
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* @link https://github.com/dompdf/dompdf |
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* @license http://www.gnu.org/copyleft/lesser.html GNU Lesser General Public License |
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*/ |
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namespace Dompdf\Frame; |
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|
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use Iterator; |
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use Dompdf\Frame; |
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|
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/** |
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* Pre-order Iterator |
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* |
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* Returns frames in preorder traversal order (parent then children) |
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* |
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* @package dompdf |
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*/ |
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class FrameTreeIterator implements Iterator |
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{ |
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/** |
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* @var Frame |
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*/ |
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protected $_root; |
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|
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/** |
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* @var Frame[] |
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*/ |
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protected $_stack = []; |
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|
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/** |
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* @var int |
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*/ |
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protected $_num; |
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|
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/** |
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* @param Frame $root |
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*/ |
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public function __construct(Frame $root) |
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{ |
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$this->_stack[] = $this->_root = $root; |
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$this->_num = 0; |
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} |
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|
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public function rewind(): void |
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{ |
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$this->_stack = [$this->_root]; |
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$this->_num = 0; |
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} |
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|
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/** |
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* @return bool |
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*/ |
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public function valid(): bool |
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{ |
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return count($this->_stack) > 0; |
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} |
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|
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/** |
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* @return int |
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*/ |
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public function key(): int |
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{ |
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return $this->_num; |
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} |
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|
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/** |
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* @return Frame |
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*/ |
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public function current(): Frame |
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{ |
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return end($this->_stack); |
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} |
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|
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public function next(): void |
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{ |
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$b = array_pop($this->_stack); |
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$this->_num++; |
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|
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// Push all children onto the stack in reverse order |
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if ($c = $b->get_last_child()) { |
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$this->_stack[] = $c; |
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while ($c = $c->get_prev_sibling()) { |
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$this->_stack[] = $c; |
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} |
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} |
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} |
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} |
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|
