Test if some elements fits in a page

[Filipe Sousa-3]

I have been doing some experiments with ColumnText to see if some
iText element fits in the page. I'm witting 38 time the word "Hello"
and 5 times the word "World". If the last 5 words does not fit in the
page I want them in a new page. Here is what I did

Document doc = new Document();
try {
  PdfWriter w = PdfWriter.getInstance(doc, new
FileOutputStream("/home/fsousa/test.pdf"));
  doc.open();

  ColumnText ct = new ColumnText(w.getDirectContent());
  ct.setSimpleColumn(doc.left(), doc.bottom(), doc.right(), doc.top());

  for (int i = 0; i < 38; ++i)
    ct.addElement(new Phrase(i + ". Hello"));

  int status = ct.go();
  while (ColumnText.hasMoreText(status)) {
    doc.newPage();
    ct.setYLine(doc.top());
    status = ct.go();
  }

  float y = ct.getYLine();

  for (int i = 0; i < 5; ++i)
    ct.addElement(new Phrase(i + ". World\n"));

  status = ct.go(true);
  if (ColumnText.hasMoreText(status))
    ct.setText(null);

  for (int i = 0; i < 5; ++i)
    ct.addElement(new Phrase(i + ". World\n"));

  if (ColumnText.hasMoreText(status)) {
    doc.newPage();
    ct.setYLine(doc.top());
  } else
    ct.setYLine(y);

  ct.go();

} catch (FileNotFoundException e) {
  e.printStackTrace();
} catch (DocumentException e) {
  e.printStackTrace();
}
doc.close();

It works but I have to call ct.setText(null) to clear the remaining
elements in ColumnText. I could use ct.addText() instead of
ct.addElement() and calling ct.clearChunks(). Is this the right thing
or is there a better way.
--
Filipe Sousa

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[Paulo Soares-3]

The better way is to create a new ColumnText, the first one is "spent" anyway.

Paulo

> -----Original Message-----
> From: natros [mailto:natros@...]
> Sent: Thursday, July 02, 2009 12:32 PM
> To: itext-questions@...
> Subject: [iText-questions] Test if some elements fits in a page
>
> I have been doing some experiments with ColumnText to see if some
> iText element fits in the page. I'm witting 38 time the word "Hello"
> and 5 times the word "World". If the last 5 words does not fit in the
> page I want them in a new page. Here is what I did
>
> Document doc = new Document();
> try {
>   PdfWriter w = PdfWriter.getInstance(doc, new
> FileOutputStream("/home/fsousa/test.pdf"));
>   doc.open();
>
>   ColumnText ct = new ColumnText(w.getDirectContent());
>   ct.setSimpleColumn(doc.left(), doc.bottom(), doc.right(),
> doc.top());
>
>   for (int i = 0; i < 38; ++i)
>     ct.addElement(new Phrase(i + ". Hello"));
>
>   int status = ct.go();
>   while (ColumnText.hasMoreText(status)) {
>     doc.newPage();
>     ct.setYLine(doc.top());
>     status = ct.go();
>   }
>
>   float y = ct.getYLine();
>
>   for (int i = 0; i < 5; ++i)
>     ct.addElement(new Phrase(i + ". World\n"));
>
>   status = ct.go(true);
>   if (ColumnText.hasMoreText(status))
>     ct.setText(null);
>
>   for (int i = 0; i < 5; ++i)
>     ct.addElement(new Phrase(i + ". World\n"));
>
>   if (ColumnText.hasMoreText(status)) {
>     doc.newPage();
>     ct.setYLine(doc.top());
>   } else
>     ct.setYLine(y);
>
>   ct.go();
>
> } catch (FileNotFoundException e) {
>   e.printStackTrace();
> } catch (DocumentException e) {
>   e.printStackTrace();
> }
> doc.close();
>
> It works but I have to call ct.setText(null) to clear the remaining
> elements in ColumnText. I could use ct.addText() instead of
> ct.addElement() and calling ct.clearChunks(). Is this the right thing
> or is there a better way.
> --
> Filipe Sousa

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