Background and border color transparency support for textboxes when color is undefined

Author: Chudy20007

Diff for: docs/changes/2.x/2.0.0.md

@@ -5,6 +5,7 @@
 ## Enhancements
 
 - IOFactory : Added extractVariables method to extract variables from a document [@sibalonat](https://github.com/sibalonat) in [#2515](https://github.com/PHPOffice/PHPWord/pull/2515)
+- TextBox: Added support for background and border color transparency [@chudy20007](https://github.com/Chudy20007) in [#2555](https://github.com/PHPOffice/PHPWord/pull/2555)
 
 ### Bug fixes
 

Diff for: src/PhpWord/Writer/Word2007/Element/TextBox.php

@@ -50,6 +50,13 @@ public function write(): void
 
         if ($style->getBgColor()) {
             $xmlWriter->writeAttribute('fillcolor', $style->getBgColor());
+        } else {
+            $xmlWriter->writeAttribute('filled', 'f');
+        }
+
+        if (!$style->getBorderColor()) {
+            $xmlWriter->writeAttribute('stroked', 'f');
+            $xmlWriter->writeAttribute('strokecolor', 'white');
         }
 
         $styleWriter->write();

Diff for: tests/PhpWordTests/Writer/Word2007/Element/TextBoxTest.php

@@ -0,0 +1,84 @@
+<?php
+
+declare(strict_types=1);
+
+namespace PhpOffice\PhpWordTests\Writer\Word2007\Element;
+
+use PhpOffice\PhpWord\Element\TextBox as TextBoxElement;
+use PhpOffice\PhpWord\Shared\XMLWriter;
+use PhpOffice\PhpWord\Style\TextBox as TextBoxStyle;
+use PhpOffice\PhpWord\Writer\Word2007\Element\TextBox;
+use PHPUnit\Framework\TestCase;
+
+class TextBoxTest extends TestCase
+{
+    /**
+     * @dataProvider textBoxColorProvider
+     */
+    public function testTextBoxGeneratesCorrectXml(
+        ?string $bgColor,
+        ?string $borderColor,
+        string $expectedFillColorAttribute,
+        string $expectedBorderColorAttribute
+    ): void {
+        // Arrange
+        $xmlWriter = new XMLWriter();
+        $style = new TextBoxStyle();
+
+        if ($bgColor !== null) {
+            $style->setBgColor($bgColor);
+        }
+
+        if ($borderColor !== null) {
+            $style->setBorderColor($borderColor);
+        }
+
+        $textBoxElement = new TextBoxElement($style);
+        $textBox = new TextBox($xmlWriter, $textBoxElement);
+
+        // Act
+        $textBox->write();
+        $output = $xmlWriter->getData();
+
+        // Assert
+        self::assertStringContainsString($expectedFillColorAttribute, $output, 'Background color should be applied.');
+        self::assertStringContainsString($expectedBorderColorAttribute, $output, 'Border color should be applied correctly.');
+    }
+
+    /**
+     * Data provider for testing different combinations of background and border colors.
+     */
+    protected function textBoxColorProvider(): array
+    {
+        return [
+            // Case 1: Background color set, border color set
+            'With both colors' => [
+                '#FF0000',
+                '#000000',
+                'fillcolor="#FF0000"',
+                'stroke color="#000000"',
+            ],
+            // Case 2: Background color set, no border color
+            'With background only' => [
+                '#00FF00',
+                null,
+                'fillcolor="#00FF00"',
+                'stroked="f" strokecolor="white"',
+            ],
+            // Case 3: No background color, border color set
+            'With border only' => [
+                null,
+                '#123456',
+                'filled="f"',
+                'stroke color="#123456"',
+            ],
+            // Case 4: Neither background nor border color set
+            'Without any colors' => [
+                null,
+                null,
+                'filled="f"',
+                'stroked="f" strokecolor="white"',
+            ],
+        ];
+    }
+}