Add functionality to shift RowRange and ColumnRange

src/PhpSpreadsheet/Cell/CellAddress.php

@@ -66,6 +66,7 @@ class CellAddress
     {
         self::validateColumnAndRow($columnId, $rowId);
 
+        /** @phpstan-ignore-next-line */
         return new static(Coordinate::stringFromColumnIndex($columnId) . ((string) $rowId), $worksheet);
     }
 
@@ -81,6 +82,7 @@ class CellAddress
      */
     public static function fromCellAddress($cellAddress, ?Worksheet $worksheet = null): self
     {
+        /** @phpstan-ignore-next-line */
         return new static($cellAddress, $worksheet);
     }
 

src/PhpSpreadsheet/Cell/ColumnRange.php

@@ -67,6 +67,22 @@ class ColumnRange
         return $this->to - $this->from + 1;
     }
 
+    public function shiftDown(int $offset = 1): self
+    {
+        $newFrom = $this->from + $offset;
+        $newFrom = ($newFrom < 1) ? 1 : $newFrom;
+
+        $newTo = $this->to + $offset;
+        $newTo = ($newTo < 1) ? 1 : $newTo;
+
+        return self::fromColumnIndexes($newFrom, $newTo, $this->worksheet);
+    }
+
+    public function shiftUp(int $offset = 1): self
+    {
+        return $this->shiftDown(0 - $offset);
+    }
+
     public function from(): string
     {
         return Coordinate::stringFromColumnIndex($this->from);

src/PhpSpreadsheet/Cell/RowRange.php

@@ -58,6 +58,22 @@ class RowRange
         return $this->to - $this->from + 1;
     }
 
+    public function shiftRight(int $offset = 1): self
+    {
+        $newFrom = $this->from + $offset;
+        $newFrom = ($newFrom < 1) ? 1 : $newFrom;
+
+        $newTo = $this->to + $offset;
+        $newTo = ($newTo < 1) ? 1 : $newTo;
+
+        return new self($newFrom, $newTo, $this->worksheet);
+    }
+
+    public function shiftLeft(int $offset = 1): self
+    {
+        return $this->shiftRight(0 - $offset);
+    }
+
     public function toCellRange(): CellRange
     {
         return new CellRange(

tests/PhpSpreadsheetTests/Cell/ColumnRangeTest.php

@@ -62,4 +62,28 @@ class ColumnRangeTest extends TestCase
         self::assertSame(3, $columnRange->columnCount());
         self::assertSame('C1:E1048576', (string) $columnRange->toCellRange());
     }
+
+    public function testColumnRangeNext(): void
+    {
+        $columnRange = new ColumnRange('C', 'E');
+        $columnRangeNext = $columnRange->shiftDown(3);
+
+        self::assertSame('F', $columnRangeNext->from());
+        self::assertSame('H', $columnRangeNext->to());
+
+        // Check that original Column Range isn't changed
+        self::assertSame('C:E', (string) $columnRange);
+    }
+
+    public function testColumnRangePrevious(): void
+    {
+        $columnRange = new ColumnRange('C', 'E');
+        $columnRangeNext = $columnRange->shiftUp();
+
+        self::assertSame('B', $columnRangeNext->from());
+        self::assertSame('D', $columnRangeNext->to());
+
+        // Check that original Column Range isn't changed
+        self::assertSame('C:E', (string) $columnRange);
+    }
 }

tests/PhpSpreadsheetTests/Cell/RowRangeTest.php

@@ -48,4 +48,28 @@ class RowRangeTest extends TestCase
         self::assertSame(3, $rowRange->rowCount());
         self::assertSame('A3:XFD5', (string) $rowRange->toCellRange());
     }
+
+    public function testRowRangeNext(): void
+    {
+        $rowRange = new RowRange(3, 5);
+        $rowRangeNext = $rowRange->shiftRight(3);
+
+        self::assertSame(6, $rowRangeNext->from());
+        self::assertSame(8, $rowRangeNext->to());
+
+        // Check that original Row Range isn't changed
+        self::assertSame('3:5', (string) $rowRange);
+    }
+
+    public function testRowRangePrevious(): void
+    {
+        $rowRange = new RowRange(3, 5);
+        $rowRangeNext = $rowRange->shiftLeft();
+
+        self::assertSame(2, $rowRangeNext->from());
+        self::assertSame(4, $rowRangeNext->to());
+
+        // Check that original Row Range isn't changed
+        self::assertSame('3:5', (string) $rowRange);
+    }
 }