Question

I don’t know the width of the texts in the textblock beforehand, and I want the the textblock to be aligned to the right like this, while still having the individual lines left-aligned:

                                Mr. Petersen      |
                                Elmstreet 9       |
                                888 Fantastic City|

(| donotes the right edge of the document)

It should be simple, but I can’t figure it out.

I’ve tried to put all the text in a paragraph and set paragraph.Alignment = Element.ALIGN_RIGHT, but this will rightalign the individual lines.

I’ve tried to put the paragraph in a cell inside a table, and rightalign the cell, but the cell just takes the full width of the table.

If I could just create a container that would take only the needed width, I could simply rightalign this container, so maybe that is really my question.

Answer 1

Just set the Paragraph.Align property:

using (Document document = new Document()) {
  PdfWriter.GetInstance(
    document, STREAM
  );
  document.Open();
  for (int i = 1; i < 11; ++i) {
    Paragraph p = new Paragraph(string.Format(
      "Paragraph {0}", i
    ));
    p.Alignment = Element.ALIGN_RIGHT;
    document.Add(p);
  } 
}

It even works with a long string like this:

string longString = @"
iText ® is a library that allows you to create and manipulate PDF documents. It enables developers looking to enhance web- and other applications with dynamic PDF document generation and/or manipulation.
";
Paragraph pLong = new Paragraph(longString);
pLong.Alignment = Element.ALIGN_RIGHT;
document.Add(pLong);

EDIT:
After looking at the “picture” you drew…

It doesn’t match with the title. The only way you can align individual Paragraph objects like your picture is if the “paragraph” does NOT exceed the Document object’s “content” box (for a lack of a better term). In other words, you won’t be able to get that type of alignment if the amount of text exceeds that which will fit on a single line.

With that said, if you want that type of alignment you need to:

1. Calculate the widest value from the collection of strings you intend to use.
2. Use that value to set a common left indentation value for the Paragraphs.

Something like this:

using (Document document = new Document()) {
  PdfWriter.GetInstance(
    document, STREAM
  );
  document.Open();
  List<Chunk> chunks = new List<Chunk>();
  float widest = 0f;
  for (int i = 1; i < 5; ++i) {
    Chunk c = new Chunk(string.Format(
      "Paragraph {0}", Math.Pow(i, 24)
    ));
    float w = c.GetWidthPoint();
    if (w > widest) widest = w;
    chunks.Add(c);
  } 
  float indentation = document.PageSize.Width
    - document.RightMargin
    - document.LeftMargin
    - widest
  ;
  foreach (Chunk c in chunks) {
    Paragraph p = new Paragraph(c);
    p.IndentationLeft = indentation;
    document.Add(p);
  }
}

UPDATE 2:

After reading your updated question, here’s another option that lets you add text to the left side of the “container”:

string textBlock = @"
Mr. Petersen
Elmstreet 9
888 Fantastic City  
".Trim();
// get the longest line to calcuate the container width  
var widest = textBlock.Split(
    new string[] {Environment.NewLine}
    , StringSplitOptions.None
  )
  .Aggregate(
    "", (x, y) => x.Length > y.Length ? x : y
  )
;
// throw-away Chunk; used to set the width of the PdfPCell containing
// the aligned text block
float w = new Chunk(widest).GetWidthPoint();
PdfPTable t = new PdfPTable(2);
float pageWidth = document.PageSize.Width 
  - document.LeftMargin 
  - document.RightMargin
;
t.SetTotalWidth(new float[]{ pageWidth - w, w });
t.LockedWidth = true;  
t.DefaultCell.Padding = 0;
// you can add text in the left PdfPCell if needed
t.AddCell("");
t.AddCell(textBlock);
document.Add(t);