[PDFBOX-3812] Support auto size font for multiline PDTextField

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.0.6
• Fix Version/s: 2.0.21, 3.0.0 PDFBox
• Component/s: AcroForm
• Environment: Windows 7 and Mac OSX, Java 1.8.0_121
• Assignee: Maruan Sahyoun
• Reporter: Marek Zajac
• Created: 29/May/17 15:47
• Updated: 16/Oct/20 06:26
• Resolved: 24/Jun/20 10:08

Description

Hello, I ve got a simple pdf file "TestPDF.pdf" with just one text field named "Text1". It is set up as auto size and multiline field.

My code :

GeneratePDF.java

	File fileTemplate = new File("/Users/xxx/Downloads/TestPDF.pdf");
		PDDocument doc = null;
		try {
			doc = PDDocument.load(fileTemplate);
		} catch (IOException e) {
			e.printStackTrace();
		}
		PDDocumentCatalog catalog = doc.getDocumentCatalog();
		PDAcroForm form = catalog.getAcroForm();
		PDTextField field = (PDTextField)form.getField("Text1");
//		field.setDefaultAppearance("/Helv 0 Tf 1 0 0 rg")

		String longText = "THIS IS A VERY VERY LONG TEXT IN A MULTINLINE TEXT FIELD " 
				+ "THIS CAN BE REALY LONG TEXT FIELD CONTAINING A FULL ADDRESS OF THE CUSTOMER"
				+ "WE WANT TO HAVE AN AUTO SIZED FIELD WITH DYNAMICALY CHANGED FONT SIZE. TO TEST IT OUT WE" + "NEED AT THE END 123";
		try {
			field.setValue(longText);
//			form.flatten();
			doc.save("/Users/xxx/TestPDF_generated.pdf");
			doc.close();
		} catch (IOException e) {
			e.printStackTrace();
		}
	

Please open the attached "TestPDF_gen.pdf" file in the Adobe Acrobat. It shows the text cut off at the end. However if you click inside the field it sudenly renders text properly.

Other remarks :
1. If you open the "TestPDF_gen.pdf" file in the Preview (Mac OSX default pdf viewer) then the Text1 shows text properly auto sized.
2. If you do flat the form by uncommenting form.flatten(). Then the Text1 is cut off at the end of the text and font size is not auto. I ve tried both Adobe Acrobat and Preview. See the "TestPDF_gen_flatten.pdf"
3. I ve also tried calling setDefaultAppearance method before setting the field's value - field.setDefaultAppearance("/Helv 0 Tf 1 0 0 rg") but it did not help.

Issue Links

• is duplicated by: PDFBOX-4568 Field text poorly vertically aligned
• links to: GitHub Pull Request #78