public function setIndentationLevel($level)
{
$oldLevel = $this->getIndentationLevel();
parent::setIndentationLevel($level);
$this->_spaces = $this->createSpaces();
if ($this->hasChildren()) {
$children = $this->getChildren();
for ($i = 0, $len = count($children); $i < $len; $i++) {
$childNode = $children[$i];
$currentLevel = $this->getIndentationLevel();
$childLevel = $childNode->getIndentationLevel();
$oldDiff = $childLevel - $oldLevel;
$newLevel = $currentLevel + $oldDiff;
$childNode->setIndentationLevel($newLevel);
}
}
}