public virtual void AccessibleAttributesInsertionTest01()
{
PdfReader reader = new PdfReader(sourceFolder + "taggedDocumentWithAttributes.pdf");
PdfWriter writer = new PdfWriter(destinationFolder + "accessibleAttributesInsertionTest01.pdf");
PdfDocument document = new PdfDocument(reader, writer);
TagTreePointer pointer = new TagTreePointer(document);
// 2 attributes
AccessibilityProperties properties = pointer.MoveToKid(0).GetProperties();
PdfStructureAttributes testAttr = new PdfStructureAttributes("test");
testAttr.AddIntAttribute("N", 4);
properties.AddAttributes(testAttr);
testAttr = new PdfStructureAttributes("test");
testAttr.AddIntAttribute("N", 0);
properties.AddAttributes(0, testAttr);
testAttr = new PdfStructureAttributes("test");
testAttr.AddIntAttribute("N", 5);
properties.AddAttributes(4, testAttr);
testAttr = new PdfStructureAttributes("test");
testAttr.AddIntAttribute("N", 2);
properties.AddAttributes(2, testAttr);
try {
properties.AddAttributes(10, testAttr);
NUnit.Framework.Assert.Fail();
}
catch (Exception e) {
NUnit.Framework.Assert.IsTrue(ExceptionUtil.IsOutOfRange(e));
}
document.Close();
CompareResult("accessibleAttributesInsertionTest01.pdf", "cmp_accessibleAttributesInsertionTest01.pdf", "diffAttributes01_"
);
}
public virtual void TagTreePointerTest02()
{
FileStream fos = new FileStream(destinationFolder + "tagTreePointerTest02.pdf", FileMode.Create);
PdfWriter writer = new PdfWriter(fos);
writer.SetCompressionLevel(CompressionConstants.NO_COMPRESSION);
PdfDocument document = new PdfDocument(writer);
document.SetTagged();
PdfPage page = document.AddNewPage();
TagTreePointer tagPointer = new TagTreePointer(document);
tagPointer.SetPageForTagging(page);
PdfCanvas canvas = new PdfCanvas(page);
canvas.BeginText();
PdfFont standardFont = PdfFontFactory.CreateFont(StandardFonts.COURIER);
canvas.SetFontAndSize(standardFont, 24).SetTextMatrix(1, 0, 0, 1, 32, 512);
PdfStructureAttributes attributes = new PdfStructureAttributes("random attributes");
attributes.AddTextAttribute("hello", "world");
tagPointer.AddTag(StandardRoles.P).AddTag(StandardRoles.SPAN).GetProperties().SetActualText("Actual text for span is: Hello World"
).SetLanguage("en-GB").AddAttributes(attributes);
canvas.OpenTag(tagPointer.GetTagReference()).ShowText("Hello ").CloseTag();
canvas.SetFontAndSize(standardFont, 30).OpenTag(tagPointer.GetTagReference()).ShowText("World").CloseTag();
canvas.EndText().Release();
page.Flush();
document.Close();
CompareResult("tagTreePointerTest02.pdf", "cmp_tagTreePointerTest02.pdf", "diff02_");
}
public override AccessibilityProperties AddAttributes(int index, PdfStructureAttributes attributes)
{
if (attributes == null)
{
return(this);
}
PdfObject attributesObject = GetBackingElem().GetAttributes(false);
PdfObject combinedAttributes = AccessibilityPropertiesToStructElem.CombineAttributesList(attributesObject,
index, JavaCollectionsUtil.SingletonList(attributes), GetBackingElem().GetPdfObject().GetAsNumber(PdfName
.R));
GetBackingElem().SetAttributes(combinedAttributes);
return(this);
}
public override AccessibilityProperties AddAttributes(int index, PdfStructureAttributes attributes)
{
if (attributes != null)
{
if (index > 0)
{
attributesList.Add(index, attributes);
}
else
{
attributesList.Add(attributes);
}
}
return(this);
}
public virtual void AccessibleAttributesInsertionTest02()
{
PdfReader reader = new PdfReader(sourceFolder + "taggedDocumentWithAttributes.pdf");
PdfWriter writer = new PdfWriter(destinationFolder + "accessibleAttributesInsertionTest02.pdf");
PdfDocument document = new PdfDocument(reader, writer);
TagTreePointer pointer = new TagTreePointer(document);
PdfStructureAttributes testAttrDict = new PdfStructureAttributes("test");
// 1 attribute array
pointer.MoveToKid(1).GetProperties().AddAttributes(testAttrDict);
pointer.MoveToRoot();
// 3 attributes
pointer.MoveToKid(2).GetProperties().AddAttributes(testAttrDict);
pointer.MoveToRoot();
// 1 attribute dictionary
pointer.MoveToKid(0).MoveToKid(StandardRoles.LI).MoveToKid(StandardRoles.LBODY).GetProperties().AddAttributes
(testAttrDict);
// no attributes
pointer.MoveToKid(StandardRoles.P).MoveToKid(StandardRoles.SPAN).GetProperties().AddAttributes(testAttrDict
);
document.Close();
CompareResult("accessibleAttributesInsertionTest02.pdf", "cmp_accessibleAttributesInsertionTest02.pdf", "diffAttributes02_"
);
}
public override AccessibilityProperties AddAttributes(PdfStructureAttributes attributes)
{
return(AddAttributes(-1, attributes));
}
public virtual AccessibilityProperties AddAttributes(int index, PdfStructureAttributes attributes)
{
return(this);
}
protected void ManipulatePdf(String dest)
{
PdfDocument pdfDocument = new PdfDocument(new PdfWriter(dest));
pdfDocument.SetTagged();
Document doc = new Document(pdfDocument);
Table table = new Table(UnitValue.CreatePercentArray(3)).UseAllAvailableWidth();
// Initialize ID strings beforehand. Every ID should be unique across the document
PdfString[] headersId =
{
// Since '/ID' is a `byte string` according to specification we are not passing
// encoding to the constructor of the PdfString
new PdfString("header_id_0"), new PdfString("header_id_1"), new PdfString("header_id_2")
};
PdfName idTreeName = new PdfName("IDTree");
PdfNameTree idTree = new PdfNameTree(pdfDocument.GetCatalog(), idTreeName);
for (int i = 0; i < 3; ++i)
{
Cell c = new Cell().Add(new Paragraph("Header " + (i + 1)));
c.GetAccessibilityProperties().SetRole(StandardRoles.TH);
table.AddHeaderCell(c);
PdfString headerId = headersId[i];
// Use custom renderer for cell header element in order to add ID to its tag
CellRenderer renderer = new StructIdCellRenderer(c, doc, headerId, idTree);
c.SetNextRenderer(renderer);
}
List <TaggingHintKey> colSpanHints = new List <TaggingHintKey>();
for (int i = 0; i < 4; i++)
{
Cell c;
if (i < 3)
{
c = new Cell().Add(new Paragraph((i + 1).ToString()));
}
else
{
// Colspan creation
c = new Cell(1, 3).Add(new Paragraph((i + 1).ToString()));
}
if (i < 3)
{
// Correct table tagging requires marking which headers correspond to the given cell.
// The correspondence is defined by header cells tags IDs. For table cells without
// col/row spans it's easy to reference a header: just add proper
// PdfStructureAttributes to it. Table cells with col spans are processed below.
PdfStructureAttributes tableAttributes = new PdfStructureAttributes("Table");
PdfArray headers;
headers = new PdfArray(headersId[i % headersId.Length]);
tableAttributes.GetPdfObject().Put(PdfName.Headers, headers);
c.GetAccessibilityProperties().AddAttributes(tableAttributes);
}
else
{
// When we add PdfStructureAttributes to the element these attributes override any
// attributes generated for it automatically. E.g. cells with colspan require properly
// generated attributes which describe the colspan (e.g. which columns this cell spans).
// So here we will use a different approach: fetch the tag which will be created for
// the cell and modify attributes object directly.
TaggingHintKey colSpanCellHint = LayoutTaggingHelper.GetOrCreateHintKey(c);
colSpanHints.Add(colSpanCellHint);
}
table.AddCell(c);
}
doc.Add(table);
// After table has been drawn on the page, we can modify the colspan cells tags
foreach (TaggingHintKey colSpanHint in colSpanHints)
{
WaitingTagsManager waitingTagsManager = pdfDocument.GetTagStructureContext().GetWaitingTagsManager();
TagTreePointer p = new TagTreePointer(pdfDocument);
// Move tag pointer to the colspan cell using its hint
if (!waitingTagsManager.TryMovePointerToWaitingTag(p, colSpanHint))
{
// It is not expected to happen ever if immediate-flush is enabled (which is by default),
// otherwise this should be done after the flush
throw new InvalidOperationException("A work-around does not work. A tag for the cell is " +
"not created or cannot be found.");
}
foreach (PdfStructureAttributes attr in p.GetProperties().GetAttributesList())
{
if ("Table".Equals(attr.GetAttributeAsEnum("O")))
{
// Specify all the headers for the column spanning (all of 3)
PdfArray headers = new PdfArray(headersId);
attr.GetPdfObject().Put(PdfName.Headers, headers);
break;
}
}
}
pdfDocument.GetStructTreeRoot().GetPdfObject().Put(idTreeName, idTree.BuildTree()
.MakeIndirect(pdfDocument));
doc.Close();
}
