fix(pptx): handle self-closing bodyPr in empty element handler for vertical alignment

Self-closing <a:bodyPr anchor="ctr"/> was only handled in handle_start
but not in handle_empty, causing vertical text alignment to be lost
when bodyPr had no child elements.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Signed-off-by: Yonghye Kwon <developer.0hye@gmail.com>

Author: developer0hye

crates/office2pdf/src/parser/pptx_shape_style_tests.rs

@@ -468,3 +468,47 @@ fn test_textbox_fill_from_style_fill_ref() {
     let tb = text_box_data(&page.elements[1]);
     assert_eq!(tb.fill, None, "Text overlay should have no fill");
 }
+
+#[test]
+fn test_split_textbox_preserves_alignment() {
+    // roundRect with centered text, solidFill, and bodyPr anchor="ctr".
+    let shape_xml = r#"<p:sp><p:nvSpPr><p:cNvPr id="2" name="Shape"/><p:cNvSpPr/><p:nvPr/></p:nvSpPr><p:spPr><a:xfrm><a:off x="0" y="0"/><a:ext cx="1696720" cy="650158"/></a:xfrm><a:prstGeom prst="roundRect"><a:avLst/></a:prstGeom><a:solidFill><a:srgbClr val="003481"/></a:solidFill></p:spPr><p:txBody><a:bodyPr rtlCol="0" anchor="ctr"/><a:lstStyle/><a:p><a:pPr algn="ctr"/><a:r><a:rPr lang="en-US"/><a:t>Random Sample</a:t></a:r></a:p></p:txBody></p:sp>"#.to_string();
+    let slide_xml = make_slide_xml(&[shape_xml]);
+    let data = build_test_pptx(SLIDE_CX, SLIDE_CY, &[slide_xml]);
+    let parser = PptxParser;
+    let (doc, _warnings) = parser.parse(&data, &ConvertOptions::default()).unwrap();
+
+    let page = first_fixed_page(&doc);
+    // Should be split into Shape + TextBox
+    assert_eq!(page.elements.len(), 2, "Expected Shape + TextBox pair");
+
+    // TextBox overlay should preserve vertical and horizontal alignment
+    let tb = text_box_data(&page.elements[1]);
+    assert_eq!(
+        tb.vertical_align,
+        TextBoxVerticalAlign::Center,
+        "Vertical align should be Center"
+    );
+    // Check paragraph alignment
+    let para = match &tb.content[0] {
+        Block::Paragraph(p) => p,
+        _ => panic!("Expected Paragraph"),
+    };
+    assert_eq!(
+        para.style.alignment,
+        Some(Alignment::Center),
+        "Paragraph alignment should be Center"
+    );
+    assert_eq!(
+        para.runs[0].text, "Random Sample",
+        "Text content should be preserved"
+    );
+
+    // Verify Typst output contains #align(center)
+    let typst_output = crate::render::typst_gen::generate_typst(&doc).unwrap();
+    assert!(
+        typst_output.source.contains("#align(center)"),
+        "Typst output should contain #align(center) for centered paragraph, got:\n{}",
+        typst_output.source,
+    );
+}

crates/office2pdf/src/parser/pptx_slides.rs

@@ -1172,6 +1172,14 @@ impl<'a> SlideXmlParser<'a> {
                     .map(pptx_dash_to_border_style)
                     .unwrap_or(BorderLineStyle::Solid);
             }
+            // Handle self-closing <a:bodyPr anchor="ctr"/> (no child elements).
+            b"bodyPr" if self.in_shape && self.in_txbody => {
+                extract_pptx_text_box_body_props(
+                    e,
+                    &mut self.text_box_padding,
+                    &mut self.text_box_vertical_align,
+                );
+            }
             b"prstGeom" if self.shape.in_sp_pr => {
                 if let Some(prst) = get_attr_str(e, b"prst") {
                     self.shape.prst_geom = Some(prst);