Grid/Action/RowAction.php
public function render($row)
    {
        foreach ($this->callbacks as $callback) {
            if (is_callable($callback)) {
                if (null === call_user_func($callback, $this, $row)) {
                    return;
                }
            }
        }

        return $this;
    }
public function render($row)
    {
        foreach ($this->callbacks as $callback) {
            if (is_callable($callback)) {
                if (null === call_user_func($callback, $this, $row)) {
                    return;
                }
            }
        }

        return $this;
    }
Render action for row.

@param Row $row

@return RowAction|null