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https://issues.apache.org/jira/browse/PDFBOX-2873?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14624034#comment-14624034
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Maruan Sahyoun commented on PDFBOX-2873:
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Let me add some background first. An interactive form field in a PDF consists
of two entries - the field and the annotation. Both are dictionaries which can
be combined in one as the dictionary keys are unique between annotations and
fields. The key /Ff belongs to the field dictionary, the key /F belongs to the
annotation dictionary. As the same field might be represented multiple times
visually a field might have multiple annotation assigned to it. So above code
only works if the field has a single annotation.
To get the annotation(s) associated with the field you can call
{{field.getWidgets()}} wich gives you a list of {{PDAnnotationWidget}}. With
these you can use methods such as {{setHidden}}.
So in fact you don't set the annotation flags on top of the field. You set them
for the annotation.
> Make bitfields public in PDField like in PDAnnotation
> -----------------------------------------------------
>
> Key: PDFBOX-2873
> URL: https://issues.apache.org/jira/browse/PDFBOX-2873
> Project: PDFBox
> Issue Type: Improvement
> Components: PDModel
> Affects Versions: 2.0.0
> Reporter: Roberto Nibali
> Priority: Minor
> Original Estimate: 1h
> Remaining Estimate: 1h
>
> I need to set COSName.FF and COSName.F dictionary entries to amend a broken
> fields clone from one PDF to another. Here is part of the code to illustrate
> what I'm trying to achieve:
> String fieldToHideName = "01.024";
> String fieldToShowName = "01.0251";
> PDField fieldToHide =
> tplDoc.getDocumentCatalog().getAcroForm().getField(fieldToHideName);
> PDField fieldToShow =
> tplDoc.getDocumentCatalog().getAcroForm().getField(fieldToShowName);
> fieldToHide.getCOSObject().setFlag(COSName.F,
> PDAnnotation.FLAG_HIDDEN, true);
> fieldToShow.getCOSObject().setFlag(COSName.F,
> PDAnnotation.FLAG_INVISIBLE, false);
> fieldToShow.getCOSObject().setFlag(COSName.FF,
> PDFields.FLAG_READ_ONLY, true);
> The last one is not possible because the PDField's static flags are private
> instead of public. I know there are methods to call, but I believe in this
> case the resulting code is easier to read and more straight-forward to write.
> After all we're talking about setting flags. For some reason the
> PDAnnotation's static flags are public.
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