/**
* Move a node under the same parent node or under a new node.
* New position of the node can be specified
*
* @param int $id ID of the node to move
* @param int $parent_id ID of the (new) parent node
* @param int $position New position of the node. Position is zero based.
* @return boolean
*/
public function moveNode($id, $parent_id, $position = null)
{
$primaryKey = $this->_table->schema()->primaryKey();
$primaryKey = count($primaryKey) == 1 ? $primaryKey[0] : $primaryKey;
$parent_id_fieldname = $this->config('model_parent_id_fieldname');
$sort_fieldname = $this->config('model_sort_fieldname');
$connection = $this->_table->connection();
$connection->begin();
$result = true;
/*
* Get moved node
*/
$node = $this->_table->get($id);
/*
* Get current nodes positions of (new) siblings
*/
$current_children = $this->_table->query()->where([$parent_id_fieldname => $parent_id])->order([$sort_fieldname => 'asc']);
$new_sort_children = [];
foreach ($current_children as $current_position => $current_child) {
if ($current_child->{$primaryKey} != $id) {
$new_sort_children[] = $current_child;
}
}
/*
* Default position is after all siblings
*/
$position = isset($position) ? $position : $current_children->count();
$position = $position >= 0 ? $position : 0;
$position = $position <= count($new_sort_children) ? $position : count($new_sort_children);
/*
* Insert moved node at position
*/
array_splice($new_sort_children, $position, 0, array($node));
/*
* If node has a new parent -> save it
*/
if ($node->{$parent_id_fieldname} != $parent_id) {
$query = $this->_table->query()->update()->set([$parent_id_fieldname => $parent_id])->where([$primaryKey => $id]);
if (!$query->execute()) {
$result = false;
}
}
/*
* Update positions
*/
foreach ($new_sort_children as $index => $new_sort_child) {
$query = $this->_table->query()->update()->set([$sort_fieldname => $index * 10])->where([$primaryKey => $new_sort_child->{$primaryKey}]);
if (!$query->execute()) {
$result = false;
}
}
/***********/
if ($result) {
$connection->commit();
} else {
$connection->rollback();
}
return $result;
}
/**
* Auxiliary function used to automatically alter the value of both the left and
* right columns by a certain amount that match the passed conditions
*
* @param int $shift the value to use for operating the left and right columns
* @param string $dir The operator to use for shifting the value (+/-)
* @param string $conditions a SQL snipped to be used for comparing left or right
* against it.
* @param bool $mark whether to mark the updated values so that they can not be
* modified by future calls to this function.
* @return void
*/
protected function _sync($shift, $dir, $conditions, $mark = false)
{
$config = $this->config();
foreach ([$config['left'], $config['right']] as $field) {
$query = $this->_scope($this->_table->query());
$mark = $mark ? '*-1' : '';
$template = sprintf('%s = (%s %s %s)%s', $field, $field, $dir, $shift, $mark);
$query->update()->set($query->newExpr()->add($template));
$query->where("{$field} {$conditions}");
$query->execute();
}
}
