Adding row attributes.

src/Spout/Common/Entity/Row.php

@@ -6,6 +6,12 @@
 
 class Row
 {
+    /**
+     * The extended attributes in this row
+     * @var string[]
+     */
+    protected $attributes = [];
+
     /**
      * The cells in this row
      * @var Cell[]
@@ -30,6 +36,26 @@ public function __construct(array $cells, $style)
             ->setStyle($style);
     }
 
+    /**
+     * @return array
+     */
+    public function getAttributes()
+    {
+        return $this->attributes;
+    }
+
+    /**
+     * @param string $name
+     * @param $value
+     * @return Row
+     */
+    public function setAttribute(string $name, $value)
+    {
+        $this->attributes[$name] = (string) $value;
+
+        return $this;
+    }
+
     /**
      * @return Cell[] $cells
      */

src/Spout/Writer/XLSX/Manager/WorksheetManager.php

@@ -151,7 +151,12 @@ private function addNonEmptyRow(Worksheet $worksheet, Row $row)
         $rowIndexOneBased = $worksheet->getLastWrittenRowIndex() + 1;
         $numCells = $row->getNumCells();
 
-        $rowXML = '<row r="' . $rowIndexOneBased . '" spans="1:' . $numCells . '">';
+        $defaultAttributes = [
+            'r' => $rowIndexOneBased,
+            'spans' => '1:' . $numCells,
+        ];
+
+        $rowXML = $this->getRowXML(array_merge($row->getAttributes(), $defaultAttributes));
 
         foreach ($row->getCells() as $columnIndexZeroBased => $cell) {
             $registeredStyle = $this->applyStyleAndRegister($cell, $rowStyle);
@@ -275,6 +280,20 @@ private function getCellXMLFragmentForNonEmptyString($cellValue)
         return $cellXMLFragment;
     }
 
+    /**
+     * @param array $attributes
+     * @return string
+     */
+    private function getRowXML(array $attributes)
+    {
+        $attributes = array_map(function($key) use ($attributes)
+        {
+            return $key . '="' . $this->stringsEscaper->escape($attributes[$key]) . '"';
+        }, array_keys($attributes));
+
+        return '<row ' . implode(' ', $attributes) . '>';
+    }
+
     /**
      * {@inheritdoc}
      */