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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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* Linked-list Iterator |
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* |
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* Returns children in order and allows for the list to change during iteration, |
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* provided the changes occur to or after the current element. |
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* |
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* @package dompdf |
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*/ |
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class FrameListIterator 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 $parent; |
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|
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/** |
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* @var Frame|null |
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*/ |
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protected $cur; |
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|
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/** |
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* @var Frame|null |
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*/ |
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protected $prev; |
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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 $frame |
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*/ |
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public function __construct(Frame $frame) |
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{ |
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$this->parent = $frame; |
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$this->rewind(); |
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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->cur = $this->parent->get_first_child(); |
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$this->prev = null; |
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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 $this->cur !== null; |
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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|null |
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*/ |
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public function current(): ?Frame |
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{ |
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return $this->cur; |
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} |
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|
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public function next(): void |
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{ |
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if ($this->cur === null) { |
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return; |
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} |
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|
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if ($this->cur->get_parent() === $this->parent) { |
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$this->prev = $this->cur; |
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$this->cur = $this->cur->get_next_sibling(); |
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$this->num++; |
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} else { |
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// Continue from the previous child if the current frame has been |
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// moved to another parent |
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$this->cur = $this->prev !== null |
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? $this->prev->get_next_sibling() |
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: $this->parent->get_first_child(); |
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} |
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} |
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} |
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|
