/**
  * Create a new sheet
  * @param  string        $title
  * @param  callback|null $callback
  * @return  LaravelExcelWriter
  */
 public function sheet($title, $callback = null)
 {
     // Clone the active sheet
     $this->sheet = $this->excel->createSheet(null, $title);
     // If a parser was set, inject it
     if ($this->parser) {
         $this->sheet->setParser($this->parser);
     }
     // Set the sheet title
     $this->sheet->setTitle($title);
     // Set the default page setup
     $this->sheet->setDefaultPageSetup();
     // Do the callback
     if ($callback instanceof Closure) {
         call_user_func($callback, $this->sheet);
     }
     // Autosize columns when no user didn't change anything about column sizing
     if (!$this->sheet->hasFixedSizeColumns()) {
         $this->sheet->setAutosize(Config::get('excel.export.autosize', false));
     }
     // Parse the sheet
     $this->sheet->parsed();
     return $this;
 }