Preserve QExcell vertical alignment

src/io/excellOffice.ts

@@ -852,11 +852,13 @@ export function xlsxStylesXmlToCellFormatTable(stylesXml?: unknown): Array<CellF
     const numberFormat = normalizedNumberFormat(numberFormats[numberAttribute(record.numFmtId)]);
     const alignment = childRecord(record, "alignment");
     const horizontalAlign = normalizedHorizontalAlign(String(alignment.horizontal || ""));
+    const verticalAlign = normalizedVerticalAlign(String(alignment.vertical || ""));
     const wrapText = booleanAttribute(alignment.wrapText);
     return normalizedCellFormat({
       ...fontFormat,
       ...fillFormat,
       ...(horizontalAlign ? { horizontalAlign } : {}),
+      ...(verticalAlign ? { verticalAlign } : {}),
       ...(wrapText ? { wrapText: true } : {}),
       ...(numberFormat ? { numberFormat } : {})
     }) ?? undefined;
@@ -902,10 +904,11 @@ function buildStylesXml(styleRegistry = createCellStyleRegistry([])) {
 
     const applyFont = fontId > 0 ? ' applyFont="1"' : "";
     const applyFill = fillId > 0 ? ' applyFill="1"' : "";
-    const applyAlignment = format.horizontalAlign || format.wrapText ? ' applyAlignment="1"' : "";
+    const applyAlignment = format.horizontalAlign || format.verticalAlign || format.wrapText ? ' applyAlignment="1"' : "";
     const applyNumberFormat = numFmtId > 0 ? ' applyNumberFormat="1"' : "";
     const alignmentAttributes = [
       format.horizontalAlign ? `horizontal="${format.horizontalAlign}"` : "",
+      format.verticalAlign ? `vertical="${xlsxVerticalAlignValue(format.verticalAlign)}"` : "",
       format.wrapText ? 'wrapText="1"' : ""
     ]
       .filter(Boolean)
@@ -950,7 +953,7 @@ function cellFormatKey(format: CellFormat | undefined) {
     return "";
   }
 
-  return `${normalized.bold ? "1" : "0"}|${normalized.italics ? "1" : "0"}|${normalized.underline ? "1" : "0"}|${normalized.strike ? "1" : "0"}|${normalized.fontSize ?? ""}|${normalized.fontFamily ?? ""}|${normalized.textColor ?? ""}|${normalized.fillColor ?? ""}|${normalized.horizontalAlign ?? ""}|${normalized.wrapText ? "1" : "0"}|${normalized.numberFormat ?? ""}`;
+  return `${normalized.bold ? "1" : "0"}|${normalized.italics ? "1" : "0"}|${normalized.underline ? "1" : "0"}|${normalized.strike ? "1" : "0"}|${normalized.fontSize ?? ""}|${normalized.fontFamily ?? ""}|${normalized.textColor ?? ""}|${normalized.fillColor ?? ""}|${normalized.horizontalAlign ?? ""}|${normalized.verticalAlign ?? ""}|${normalized.wrapText ? "1" : "0"}|${normalized.numberFormat ?? ""}`;
 }
 
 function fontStyleKey(format: CellFormat) {
@@ -963,6 +966,7 @@ function normalizedCellFormat(format: CellFormat | undefined): CellFormat | null
   const textColor = normalizeFillColor(format?.textColor);
   const fillColor = normalizeFillColor(format?.fillColor);
   const horizontalAlign = normalizedHorizontalAlign(format?.horizontalAlign);
+  const verticalAlign = normalizedVerticalAlign(format?.verticalAlign);
   const numberFormat = normalizedNumberFormat(format?.numberFormat);
   const fontSize = normalizedFontSize(format?.fontSize);
   const fontFamily = normalizedFontFamily(format?.fontFamily);
@@ -976,6 +980,7 @@ function normalizedCellFormat(format: CellFormat | undefined): CellFormat | null
     ...(textColor ? { textColor } : {}),
     ...(fillColor ? { fillColor } : {}),
     ...(horizontalAlign ? { horizontalAlign } : {}),
+    ...(verticalAlign ? { verticalAlign } : {}),
     ...(format?.wrapText ? { wrapText: true } : {}),
     ...(numberFormat ? { numberFormat } : {})
   };
@@ -1049,6 +1054,19 @@ function normalizedHorizontalAlign(value?: string) {
   return normalized === "left" || normalized === "center" || normalized === "right" ? normalized : "";
 }
 
+function normalizedVerticalAlign(value?: string) {
+  const normalized = value?.trim().toLowerCase() ?? "";
+  if (normalized === "center" || normalized === "middle") {
+    return "middle";
+  }
+
+  return normalized === "top" || normalized === "bottom" ? normalized : "";
+}
+
+function xlsxVerticalAlignValue(value: CellFormat["verticalAlign"]) {
+  return value === "middle" ? "center" : value;
+}
+
 function booleanAttribute(value: unknown) {
   const normalized = String(value ?? "").trim().toLowerCase();
   return normalized === "1" || normalized === "true";