Method _getTreeRepositionData

/**
 * Method to get various data necessary to make room in the tree at a location
 * for a node and its children.  The returned data object includes conditions
 * for SQL WHERE clauses for updating left and right id values to make room for
 * the node as well as the new left and right ids for the node.
 *
 * @param   object   $referenceNode  A node object with at least a 'lft' and 'rgt' with
 *                                   which to make room in the tree around for a new node.
 * @param   integer  $nodeWidth      The width of the node for which to make room in the tree.
 * @param   string   $position       The position relative to the reference node where the room
 *                                   should be made.
 *
 * @return  mixed    Boolean false on failure or data object on success.
 *
 * @since   1.7.0
 */
protected function _getTreeRepositionData($referenceNode, $nodeWidth, $position = 'before')
{
    // Make sure the reference an object with a left and right id.
    if (!\is_object($referenceNode) || !(isset($referenceNode->lft) && isset($referenceNode->rgt))) {
        return false;
    }
    // A valid node cannot have a width less than 2.
    if ($nodeWidth < 2) {
        return false;
    }
    $k = $this->_tbl_key;
    $data = new \stdClass();
    // Run the calculations and build the data object by reference position.
    switch ($position) {
        case 'first-child':
            $data->left_where = 'lft > ' . $referenceNode->lft;
            $data->right_where = 'rgt >= ' . $referenceNode->lft;
            $data->new_lft = $referenceNode->lft + 1;
            $data->new_rgt = $referenceNode->lft + $nodeWidth;
            $data->new_parent_id = $referenceNode->{$k};
            $data->new_level = $referenceNode->level + 1;
            break;
        case 'last-child':
            $data->left_where = 'lft > ' . $referenceNode->rgt;
            $data->right_where = 'rgt >= ' . $referenceNode->rgt;
            $data->new_lft = $referenceNode->rgt;
            $data->new_rgt = $referenceNode->rgt + $nodeWidth - 1;
            $data->new_parent_id = $referenceNode->{$k};
            $data->new_level = $referenceNode->level + 1;
            break;
        case 'before':
            $data->left_where = 'lft >= ' . $referenceNode->lft;
            $data->right_where = 'rgt >= ' . $referenceNode->lft;
            $data->new_lft = $referenceNode->lft;
            $data->new_rgt = $referenceNode->lft + $nodeWidth - 1;
            $data->new_parent_id = $referenceNode->parent_id;
            $data->new_level = $referenceNode->level;
            break;
        default:
        case 'after':
            $data->left_where = 'lft > ' . $referenceNode->rgt;
            $data->right_where = 'rgt > ' . $referenceNode->rgt;
            $data->new_lft = $referenceNode->rgt + 1;
            $data->new_rgt = $referenceNode->rgt + $nodeWidth;
            $data->new_parent_id = $referenceNode->parent_id;
            $data->new_level = $referenceNode->level;
            break;
    }
    if ($this->_debug) {
        echo "\nRepositioning Data for {$position}\n-----------------------------------\nLeft Where:    {$data->left_where}" . "\nRight Where:   {$data->right_where}\nNew Lft:       {$data->new_lft}\nNew Rgt:       {$data->new_rgt}" . "\nNew Parent ID: {$data->new_parent_id}\nNew Level:     {$data->new_level}\n";
    }
    return $data;
}