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https://issues.apache.org/jira/browse/PDFBOX-1982?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13932914#comment-13932914
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John Hewson commented on PDFBOX-1982:
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Idea for further work:
One of the issues I've discovered is that form field inheritance is not really
handled in a consistent manner, for example, PDFieldFactory#isButton performs
ad-hoc inheritance for the button field, but not the other types of field,
while PDField#getKids is used within field classes to perform ad-hoc
inheritance also. Some methods such as getWidget use this to perform
inheritance but most others, such as getFieldFlags do not. Fixing this will
need some fairly substantial changes so can be done in a new issue.
> Standardise AcroForm Fields
> ---------------------------
>
> Key: PDFBOX-1982
> URL: https://issues.apache.org/jira/browse/PDFBOX-1982
> Project: PDFBox
> Issue Type: Improvement
> Components: AcroForm
> Affects Versions: 2.0.0
> Reporter: John Hewson
> Assignee: John Hewson
> Fix For: 2.0.0
>
>
> While working on adding the patch in PDFBOX-1847 I noticed that the digital
> signature form field, PDSignature is deprecated, having been replaced by
> PDSignatureField.
> Currently some aspects of the fields do not correspond with the PDF
> specification, in particular the hierarchy of the fields and their naming.
> There are currently 43 open issues for the AcroForm component and no issues
> have been closed since 2011, so I've attempted some basic refactoring to give
> us a clean slate for adding new features and fixing old bugs.
> Here's the current hierarchy of fields in PDFBox:
> PDField
> PDChoiceButton
> PDCheckbox
> PDRadioCollection
> PDPushButton
> PDVariableText
> PDChoiceField
> PDTextbox
> PDSignatureField
> PDUnknownField
> And here's the actual hierarchy from the PDF specification:
> Field
> Button
> Check Box
> Radio Button
> Pushbutton
> Text
> Choice
> List Box
> Combo Box
> Signature
> Note that PDPushButton and PDTextbox are in the wrong place in the hierarchy
> and List Box and Combo Box are missing.
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