/**
* If node does not have a display order or a sibling node has the same display order value the display order is set to the next available number.
* @param \Navinator\Node $node the node to set the display order of
* @param int $displayOrder The display order of the node in relation to it's siblings
*/
protected function autoSetNodeDisplayOrder(\Navinator\Node $node, $displayOrder = null)
{
// keep the same by default
$newNodeDisplayOrder = $displayOrder;
$siblings = $node->getSiblings($this);
if ($displayOrder == null) {
if (empty($siblings)) {
$newNodeDisplayOrder = 1;
} else {
$newNodeDisplayOrder = max($this->getNodeDisplayOrders($siblings)) + 1;
}
} else {
$siblingDisplayOrders = $this->getNodeDisplayOrders($siblings);
// if the desired display order is already taken
if (in_array($displayOrder, $siblingDisplayOrders)) {
//find first gap in sort order list after desired position
$start = $displayOrder;
sort($siblingDisplayOrders);
if ($displayOrder == 1 && count($siblings) == 1) {
$newNodeDisplayOrder = 2;
} else {
foreach ($siblingDisplayOrders as $v) {
if ($v <= $displayOrder) {
continue;
}
if ($start + 1 != $v) {
$newNodeDisplayOrder = $start + 1;
break;
}
$start = $v;
}
}
}
}
$this->node_display_order[$node->getPath()] = $newNodeDisplayOrder;
}
