I'm evaluating pdfbox for filling in form fields from a template pdf file.
>From what I can tell, pdfbox does not support autosize font. While it will
>retain the font size 0 setting, the text that is placed into the fields is not
>autosized (until you alter the value manually).
Option A:
Is there some kind of command to execute before saving the pdf to force it to
autosize?
Option B:
Do some math and calculate a new font size. I've done this (see code below) but
you obviously lose the ability to autosize if the user ends up modifying a
value.
Is there a way to do this math and set the initial display font size but leave
the DA alone with autosize set?
I'm guessing this would be done by setting some other COSName String similar to
setting the COSName.DA. However, I can't find much information on these.
Any help is appreciated. Code is below;
//item.field_value is the value I'm sticking into the form field
if (field instanceof PDTextbox)
{
int len = item.field_value.length();
if (len>2)
{
COSDictionary dict = field.getDictionary();
COSString defaultAppearance = (COSString)
dict.getDictionaryObject(COSName.DA);
if (defaultAppearance != null)
{
//split the DA to grab the font size
String[] da = defaultAppearance.getString().split(" ");
List<String> da2 = new ArrayList<String>();
//loop through and remove any empty strings
// because for some reason when the font size is 0
there is an empty extra string in the way
for(int x=0; x<da.length; x++)
{
if (da[x].length()!=0)
da2.add(da[x]);
}
//Move back to a String[] (I'm new to java)
da = da2.toArray(da);
if (da.length >= 2) //only process if there are at
least two characters
{
if (da[1].equals("0")) //If font size is
actually autosized
{
COSArray fieldAreaArray = (COSArray)
dict.getDictionaryObject(COSName.RECT);
PDRectangle rect = new
PDRectangle(fieldAreaArray);
float width = rect.getWidth();
int size = (int)(width / len * 1.92);
//doing stupid math to estimate new font size
if (size > 12)
size = 12;
else if (size < 8)
size = 8;
String customSize = "/Helv " + size + "
Tf 0 g";
dict.setString(COSName.DA, customSize);
//Set the new font size here
field = new PDTextbox(acroForm, dict);
//Create as a new field (as seen in other threads)
}
}
}
}
}
field.setValue(item.field_value); //Set the field value
Jarrod
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