mirror of
https://github.com/Frooodle/Stirling-PDF.git
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feat(multi-layout): implement form field copying and transformation for multi-page PDF to keep form data (#4314)
This commit is contained in:
Balázs Szücs
GitHub
@@ -0,0 +1,658 @@
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package stirling.software.common.util;
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import java.io.IOException;
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import java.lang.reflect.Method;
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import java.util.HashMap;
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import java.util.List;
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import java.util.Map;
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import org.apache.pdfbox.cos.COSName;
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import org.apache.pdfbox.pdmodel.PDDocument;
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import org.apache.pdfbox.pdmodel.PDDocumentCatalog;
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import org.apache.pdfbox.pdmodel.PDPage;
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import org.apache.pdfbox.pdmodel.PDResources;
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import org.apache.pdfbox.pdmodel.common.PDRectangle;
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import org.apache.pdfbox.pdmodel.font.PDType1Font;
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import org.apache.pdfbox.pdmodel.font.Standard14Fonts;
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import org.apache.pdfbox.pdmodel.interactive.annotation.PDAnnotation;
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import org.apache.pdfbox.pdmodel.interactive.annotation.PDAnnotationWidget;
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import org.apache.pdfbox.pdmodel.interactive.form.*;
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import lombok.extern.slf4j.Slf4j;
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@Slf4j
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public final class FormUtils {
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private FormUtils() {}
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public static boolean hasAnyRotatedPage(PDDocument document) {
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try {
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for (PDPage page : document.getPages()) {
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int rot = page.getRotation();
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int norm = ((rot % 360) + 360) % 360;
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if (norm != 0) {
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return true;
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}
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}
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} catch (Exception e) {
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log.warn("Failed to inspect page rotations: {}", e.getMessage(), e);
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}
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return false;
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}
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public static void copyAndTransformFormFields(
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PDDocument sourceDocument,
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PDDocument newDocument,
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int totalPages,
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int pagesPerSheet,
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int cols,
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int rows,
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float cellWidth,
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float cellHeight)
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throws IOException {
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PDDocumentCatalog sourceCatalog = sourceDocument.getDocumentCatalog();
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PDAcroForm sourceAcroForm = sourceCatalog.getAcroForm();
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if (sourceAcroForm == null || sourceAcroForm.getFields().isEmpty()) {
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return;
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}
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PDDocumentCatalog newCatalog = newDocument.getDocumentCatalog();
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PDAcroForm newAcroForm = new PDAcroForm(newDocument);
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newCatalog.setAcroForm(newAcroForm);
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PDResources dr = new PDResources();
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PDType1Font helvetica = new PDType1Font(Standard14Fonts.FontName.HELVETICA);
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PDType1Font zapfDingbats = new PDType1Font(Standard14Fonts.FontName.ZAPF_DINGBATS);
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dr.put(COSName.getPDFName("Helv"), helvetica);
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dr.put(COSName.getPDFName("ZaDb"), zapfDingbats);
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newAcroForm.setDefaultResources(dr);
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newAcroForm.setDefaultAppearance("/Helv 12 Tf 0 g");
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// Do not mutate the source AcroForm; skip bad widgets during copy
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newAcroForm.setNeedAppearances(true);
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Map<String, Integer> fieldNameCounters = new HashMap<>();
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// Build widget -> field map once for efficient lookups
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Map<PDAnnotationWidget, PDField> widgetFieldMap = buildWidgetFieldMap(sourceAcroForm);
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for (int pageIndex = 0; pageIndex < totalPages; pageIndex++) {
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PDPage sourcePage = sourceDocument.getPage(pageIndex);
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List<PDAnnotation> annotations = sourcePage.getAnnotations();
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if (annotations.isEmpty()) {
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continue;
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}
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int destinationPageIndex = pageIndex / pagesPerSheet;
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int adjustedPageIndex = pageIndex % pagesPerSheet;
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int rowIndex = adjustedPageIndex / cols;
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int colIndex = adjustedPageIndex % cols;
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if (destinationPageIndex >= newDocument.getNumberOfPages()) {
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continue;
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}
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PDPage destinationPage = newDocument.getPage(destinationPageIndex);
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PDRectangle sourceRect = sourcePage.getMediaBox();
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float scaleWidth = cellWidth / sourceRect.getWidth();
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float scaleHeight = cellHeight / sourceRect.getHeight();
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float scale = Math.min(scaleWidth, scaleHeight);
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float x = colIndex * cellWidth + (cellWidth - sourceRect.getWidth() * scale) / 2;
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float y =
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destinationPage.getMediaBox().getHeight()
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- ((rowIndex + 1) * cellHeight
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- (cellHeight - sourceRect.getHeight() * scale) / 2);
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copyBasicFormFields(
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sourceAcroForm,
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newAcroForm,
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sourcePage,
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destinationPage,
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x,
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y,
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scale,
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pageIndex,
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fieldNameCounters,
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widgetFieldMap);
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}
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// Refresh appearances to ensure widgets render correctly across viewers
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try {
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// Use reflection to avoid compile-time dependency on PDFBox version
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Method m = newAcroForm.getClass().getMethod("refreshAppearances");
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m.invoke(newAcroForm);
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} catch (NoSuchMethodException nsme) {
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log.warn(
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"AcroForm.refreshAppearances() not available in this PDFBox version; relying on NeedAppearances.");
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} catch (Throwable t) {
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log.warn("Failed to refresh field appearances via AcroForm: {}", t.getMessage(), t);
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}
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}
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private static void copyBasicFormFields(
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PDAcroForm sourceAcroForm,
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PDAcroForm newAcroForm,
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PDPage sourcePage,
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PDPage destinationPage,
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float offsetX,
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float offsetY,
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float scale,
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int pageIndex,
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Map<String, Integer> fieldNameCounters,
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Map<PDAnnotationWidget, PDField> widgetFieldMap) {
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try {
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List<PDAnnotation> sourceAnnotations = sourcePage.getAnnotations();
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List<PDAnnotation> destinationAnnotations = destinationPage.getAnnotations();
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for (PDAnnotation annotation : sourceAnnotations) {
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if (annotation instanceof PDAnnotationWidget widgetAnnotation) {
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if (widgetAnnotation.getRectangle() == null) {
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continue;
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}
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PDField sourceField =
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widgetFieldMap != null ? widgetFieldMap.get(widgetAnnotation) : null;
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if (sourceField == null) {
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continue; // skip widgets without a matching field
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}
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if (sourceField instanceof PDTextField pdtextfield) {
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createSimpleTextField(
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newAcroForm,
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destinationPage,
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destinationAnnotations,
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pdtextfield,
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widgetAnnotation,
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offsetX,
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offsetY,
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scale,
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pageIndex,
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fieldNameCounters);
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} else if (sourceField instanceof PDCheckBox pdCheckBox) {
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createSimpleCheckBoxField(
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newAcroForm,
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destinationPage,
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destinationAnnotations,
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pdCheckBox,
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widgetAnnotation,
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offsetX,
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offsetY,
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scale,
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pageIndex,
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fieldNameCounters);
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} else if (sourceField instanceof PDRadioButton pdRadioButton) {
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createSimpleRadioButtonField(
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newAcroForm,
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destinationPage,
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destinationAnnotations,
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pdRadioButton,
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widgetAnnotation,
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offsetX,
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offsetY,
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scale,
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pageIndex,
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fieldNameCounters);
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} else if (sourceField instanceof PDComboBox pdComboBox) {
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createSimpleComboBoxField(
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newAcroForm,
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destinationPage,
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destinationAnnotations,
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pdComboBox,
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widgetAnnotation,
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offsetX,
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offsetY,
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scale,
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pageIndex,
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fieldNameCounters);
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} else if (sourceField instanceof PDListBox pdlistbox) {
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createSimpleListBoxField(
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newAcroForm,
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destinationPage,
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destinationAnnotations,
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pdlistbox,
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widgetAnnotation,
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offsetX,
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offsetY,
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scale,
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pageIndex,
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fieldNameCounters);
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} else if (sourceField instanceof PDSignatureField pdSignatureField) {
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createSimpleSignatureField(
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newAcroForm,
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destinationPage,
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destinationAnnotations,
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pdSignatureField,
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widgetAnnotation,
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offsetX,
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offsetY,
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scale,
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pageIndex,
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fieldNameCounters);
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} else if (sourceField instanceof PDPushButton pdPushButton) {
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createSimplePushButtonField(
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newAcroForm,
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destinationPage,
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destinationAnnotations,
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pdPushButton,
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widgetAnnotation,
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offsetX,
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offsetY,
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scale,
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pageIndex,
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fieldNameCounters);
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}
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}
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}
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} catch (Exception e) {
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log.warn(
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"Failed to copy basic form fields for page {}: {}",
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pageIndex,
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e.getMessage(),
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e);
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}
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}
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private static void createSimpleTextField(
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PDAcroForm newAcroForm,
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PDPage destinationPage,
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List<PDAnnotation> destinationAnnotations,
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PDTextField sourceField,
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PDAnnotationWidget sourceWidget,
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float offsetX,
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float offsetY,
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float scale,
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int pageIndex,
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Map<String, Integer> fieldNameCounters) {
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try {
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PDTextField newTextField = new PDTextField(newAcroForm);
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newTextField.setDefaultAppearance("/Helv 12 Tf 0 g");
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boolean initialized =
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initializeFieldWithWidget(
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newAcroForm,
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destinationPage,
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destinationAnnotations,
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newTextField,
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sourceField.getPartialName(),
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"textField",
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sourceWidget,
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offsetX,
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offsetY,
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scale,
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pageIndex,
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fieldNameCounters);
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if (!initialized) {
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return;
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}
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if (sourceField.getValueAsString() != null) {
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newTextField.setValue(sourceField.getValueAsString());
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}
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} catch (Exception e) {
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log.warn(
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"Failed to create text field '{}': {}",
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sourceField.getPartialName(),
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e.getMessage(),
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e);
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}
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}
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private static void createSimpleCheckBoxField(
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PDAcroForm newAcroForm,
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PDPage destinationPage,
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List<PDAnnotation> destinationAnnotations,
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PDCheckBox sourceField,
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PDAnnotationWidget sourceWidget,
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float offsetX,
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float offsetY,
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float scale,
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int pageIndex,
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Map<String, Integer> fieldNameCounters) {
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try {
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PDCheckBox newCheckBox = new PDCheckBox(newAcroForm);
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boolean initialized =
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initializeFieldWithWidget(
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newAcroForm,
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destinationPage,
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destinationAnnotations,
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newCheckBox,
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sourceField.getPartialName(),
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"checkBox",
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sourceWidget,
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offsetX,
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offsetY,
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scale,
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pageIndex,
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fieldNameCounters);
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if (!initialized) {
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return;
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}
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if (sourceField.isChecked()) {
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newCheckBox.check();
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} else {
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newCheckBox.unCheck();
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}
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} catch (Exception e) {
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log.warn(
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"Failed to create checkbox field '{}': {}",
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sourceField.getPartialName(),
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e.getMessage(),
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e);
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}
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}
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private static void createSimpleRadioButtonField(
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PDAcroForm newAcroForm,
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PDPage destinationPage,
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List<PDAnnotation> destinationAnnotations,
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PDRadioButton sourceField,
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PDAnnotationWidget sourceWidget,
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float offsetX,
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float offsetY,
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float scale,
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int pageIndex,
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Map<String, Integer> fieldNameCounters) {
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try {
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PDRadioButton newRadioButton = new PDRadioButton(newAcroForm);
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boolean initialized =
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initializeFieldWithWidget(
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newAcroForm,
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destinationPage,
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destinationAnnotations,
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newRadioButton,
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sourceField.getPartialName(),
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"radioButton",
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sourceWidget,
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offsetX,
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offsetY,
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scale,
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pageIndex,
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fieldNameCounters);
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if (!initialized) {
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return;
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}
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if (sourceField.getExportValues() != null) {
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newRadioButton.setExportValues(sourceField.getExportValues());
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}
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if (sourceField.getValue() != null) {
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newRadioButton.setValue(sourceField.getValue());
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}
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} catch (Exception e) {
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log.warn(
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"Failed to create radio button field '{}': {}",
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sourceField.getPartialName(),
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e.getMessage(),
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e);
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}
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}
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private static void createSimpleComboBoxField(
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PDAcroForm newAcroForm,
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PDPage destinationPage,
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List<PDAnnotation> destinationAnnotations,
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PDComboBox sourceField,
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PDAnnotationWidget sourceWidget,
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float offsetX,
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float offsetY,
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float scale,
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int pageIndex,
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Map<String, Integer> fieldNameCounters) {
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try {
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PDComboBox newComboBox = new PDComboBox(newAcroForm);
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boolean initialized =
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initializeFieldWithWidget(
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newAcroForm,
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destinationPage,
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destinationAnnotations,
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newComboBox,
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sourceField.getPartialName(),
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"comboBox",
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sourceWidget,
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offsetX,
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offsetY,
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scale,
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pageIndex,
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fieldNameCounters);
|
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if (!initialized) {
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return;
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}
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if (sourceField.getOptions() != null) {
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newComboBox.setOptions(sourceField.getOptions());
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}
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if (sourceField.getValue() != null && !sourceField.getValue().isEmpty()) {
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newComboBox.setValue(sourceField.getValue());
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}
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} catch (Exception e) {
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log.warn(
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"Failed to create combo box field '{}': {}",
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sourceField.getPartialName(),
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e.getMessage(),
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e);
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}
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}
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private static void createSimpleListBoxField(
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||||
PDAcroForm newAcroForm,
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PDPage destinationPage,
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List<PDAnnotation> destinationAnnotations,
|
||||
PDListBox sourceField,
|
||||
PDAnnotationWidget sourceWidget,
|
||||
float offsetX,
|
||||
float offsetY,
|
||||
float scale,
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int pageIndex,
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Map<String, Integer> fieldNameCounters) {
|
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|
||||
try {
|
||||
PDListBox newListBox = new PDListBox(newAcroForm);
|
||||
|
||||
boolean initialized =
|
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initializeFieldWithWidget(
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||||
newAcroForm,
|
||||
destinationPage,
|
||||
destinationAnnotations,
|
||||
newListBox,
|
||||
sourceField.getPartialName(),
|
||||
"listBox",
|
||||
sourceWidget,
|
||||
offsetX,
|
||||
offsetY,
|
||||
scale,
|
||||
pageIndex,
|
||||
fieldNameCounters);
|
||||
|
||||
if (!initialized) {
|
||||
return;
|
||||
}
|
||||
|
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if (sourceField.getOptions() != null) {
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||||
newListBox.setOptions(sourceField.getOptions());
|
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}
|
||||
if (sourceField.getValue() != null && !sourceField.getValue().isEmpty()) {
|
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newListBox.setValue(sourceField.getValue());
|
||||
}
|
||||
} catch (Exception e) {
|
||||
log.warn(
|
||||
"Failed to create list box field '{}': {}",
|
||||
sourceField.getPartialName(),
|
||||
e.getMessage(),
|
||||
e);
|
||||
}
|
||||
}
|
||||
|
||||
private static void createSimpleSignatureField(
|
||||
PDAcroForm newAcroForm,
|
||||
PDPage destinationPage,
|
||||
List<PDAnnotation> destinationAnnotations,
|
||||
PDSignatureField sourceField,
|
||||
PDAnnotationWidget sourceWidget,
|
||||
float offsetX,
|
||||
float offsetY,
|
||||
float scale,
|
||||
int pageIndex,
|
||||
Map<String, Integer> fieldNameCounters) {
|
||||
|
||||
try {
|
||||
PDSignatureField newSignatureField = new PDSignatureField(newAcroForm);
|
||||
|
||||
boolean initialized =
|
||||
initializeFieldWithWidget(
|
||||
newAcroForm,
|
||||
destinationPage,
|
||||
destinationAnnotations,
|
||||
newSignatureField,
|
||||
sourceField.getPartialName(),
|
||||
"signature",
|
||||
sourceWidget,
|
||||
offsetX,
|
||||
offsetY,
|
||||
scale,
|
||||
pageIndex,
|
||||
fieldNameCounters);
|
||||
|
||||
if (!initialized) {
|
||||
return;
|
||||
}
|
||||
} catch (Exception e) {
|
||||
log.warn(
|
||||
"Failed to create signature field '{}': {}",
|
||||
sourceField.getPartialName(),
|
||||
e.getMessage(),
|
||||
e);
|
||||
}
|
||||
}
|
||||
|
||||
private static void createSimplePushButtonField(
|
||||
PDAcroForm newAcroForm,
|
||||
PDPage destinationPage,
|
||||
List<PDAnnotation> destinationAnnotations,
|
||||
PDPushButton sourceField,
|
||||
PDAnnotationWidget sourceWidget,
|
||||
float offsetX,
|
||||
float offsetY,
|
||||
float scale,
|
||||
int pageIndex,
|
||||
Map<String, Integer> fieldNameCounters) {
|
||||
|
||||
try {
|
||||
PDPushButton newPushButton = new PDPushButton(newAcroForm);
|
||||
|
||||
boolean initialized =
|
||||
initializeFieldWithWidget(
|
||||
newAcroForm,
|
||||
destinationPage,
|
||||
destinationAnnotations,
|
||||
newPushButton,
|
||||
sourceField.getPartialName(),
|
||||
"pushButton",
|
||||
sourceWidget,
|
||||
offsetX,
|
||||
offsetY,
|
||||
scale,
|
||||
pageIndex,
|
||||
fieldNameCounters);
|
||||
|
||||
} catch (Exception e) {
|
||||
log.warn(
|
||||
"Failed to create push button field '{}': {}",
|
||||
sourceField.getPartialName(),
|
||||
e.getMessage(),
|
||||
e);
|
||||
}
|
||||
}
|
||||
|
||||
private static <T extends PDTerminalField> boolean initializeFieldWithWidget(
|
||||
PDAcroForm newAcroForm,
|
||||
PDPage destinationPage,
|
||||
List<PDAnnotation> destinationAnnotations,
|
||||
T newField,
|
||||
String originalName,
|
||||
String fallbackName,
|
||||
PDAnnotationWidget sourceWidget,
|
||||
float offsetX,
|
||||
float offsetY,
|
||||
float scale,
|
||||
int pageIndex,
|
||||
Map<String, Integer> fieldNameCounters) {
|
||||
|
||||
String baseName = (originalName != null) ? originalName : fallbackName;
|
||||
String newFieldName = generateUniqueFieldName(baseName, pageIndex, fieldNameCounters);
|
||||
newField.setPartialName(newFieldName);
|
||||
|
||||
PDAnnotationWidget newWidget = new PDAnnotationWidget();
|
||||
PDRectangle sourceRect = sourceWidget.getRectangle();
|
||||
if (sourceRect == null) {
|
||||
return false;
|
||||
}
|
||||
|
||||
float newX = (sourceRect.getLowerLeftX() * scale) + offsetX;
|
||||
float newY = (sourceRect.getLowerLeftY() * scale) + offsetY;
|
||||
float newWidth = sourceRect.getWidth() * scale;
|
||||
float newHeight = sourceRect.getHeight() * scale;
|
||||
newWidget.setRectangle(new PDRectangle(newX, newY, newWidth, newHeight));
|
||||
newWidget.setPage(destinationPage);
|
||||
|
||||
newField.getWidgets().add(newWidget);
|
||||
newWidget.setParent(newField);
|
||||
newAcroForm.getFields().add(newField);
|
||||
destinationAnnotations.add(newWidget);
|
||||
return true;
|
||||
}
|
||||
|
||||
private static String generateUniqueFieldName(
|
||||
String originalName, int pageIndex, Map<String, Integer> fieldNameCounters) {
|
||||
String baseName = "page" + pageIndex + "_" + originalName;
|
||||
|
||||
Integer counter = fieldNameCounters.get(baseName);
|
||||
if (counter == null) {
|
||||
counter = 0;
|
||||
} else {
|
||||
counter++;
|
||||
}
|
||||
fieldNameCounters.put(baseName, counter);
|
||||
|
||||
return counter == 0 ? baseName : baseName + "_" + counter;
|
||||
}
|
||||
|
||||
private static Map<PDAnnotationWidget, PDField> buildWidgetFieldMap(PDAcroForm acroForm) {
|
||||
Map<PDAnnotationWidget, PDField> map = new HashMap<>();
|
||||
if (acroForm == null) {
|
||||
return map;
|
||||
}
|
||||
try {
|
||||
for (PDField field : acroForm.getFieldTree()) {
|
||||
List<PDAnnotationWidget> widgets = field.getWidgets();
|
||||
if (widgets != null) {
|
||||
for (PDAnnotationWidget w : widgets) {
|
||||
if (w != null) {
|
||||
map.put(w, field);
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
} catch (Exception e) {
|
||||
log.warn("Failed to build widget->field map: {}", e.getMessage(), e);
|
||||
}
|
||||
return map;
|
||||
}
|
||||
}
|
||||
Reference in New Issue
Block a user