Dear Hans,
after checking signature fields, such as the one in:
\nopdfcompression
\setupinteraction[state=start]
\setuppapersize[A6, landscape]
\setuplayout[page]
\starttext
\setupfield[sl][horizontal]
[frame=on, width=1tw, height=1th]
\definefield[Signature][signature][sl]
\field[Signature]
\stoptext
I have found Ulrike’s reply to
https://github.com/latex3/hyperref/issues/335 and the PDF output
validated fine against Arlington.
In short, signature fields may have a widget annotation children, but
the parent should be only a signature field and the child should be only
a widget annotation (not having entries from each other).
Also `/NeedAppearances true` with signature fields cause display (and
probably other) issues with “Acrobat” (so I’m replacing it with
`/SigFlags 1` [the document contains empty signature fields]).
I attach a patch with the commented keys and the extra conditionals to
avoid empty signature fields having `/NeedAppearances true` (providing
`SigFlags 1` instead).
Could you please consider merging it in ConTeXt?
Many thanks for your help,
Pablo
--- mkxl/lpdf-fld.lmt 2025-10-31 22:08:42.939179063 +0100
+++ "lpdf-fld (copy).lmt" 2025-11-05 16:38:24.754558059 +0100
@@ -112,6 +112,7 @@
local pdf_no_rect = pdfarray { 0, 0, 0, 0 }
local signature = nil
+local signature_field = nil
local splitter = lpeg.splitat("=>")
@@ -936,6 +937,8 @@
end
if type == "signed" then
signature = true
+ elseif type == "signature" then
+ signature_field = true
end
end
for name, field in sortedhash(radios) do
@@ -955,10 +958,12 @@
}
if signature then
acroform.SigFlags = 3
+ elseif signature_field then
+ acroform.SigFlags = 1
elseif pdfmajorversion() == 1 then
acroform.NeedAppearances = true
else
- -- depricated
+ -- deprecated
end
if sometext or somefont then
checkpdfdocencoding()
@@ -1124,18 +1129,19 @@
local length = tonumber(specification.length or 0) or 0
local value = lpdf.registersignature(field.values)
local d = pdfdictionary {
- Subtype = pdf_widget,
+ -- Subtype = pdf_widget, -- belongs to widget
T = pdfunicode(specification.title),
- F = fieldplus(specification),
- Ff = fieldflag(specification),
+ -- F = fieldplus(specification), -- belongs to widget
+ Ff = fieldflag(specification), -- not required, default value
OC = fieldlayer(specification),
DA = fieldsurrounding(specification),
AA = fieldactions(specification),
FT = pdf_sig,
Q = fieldalignment(specification),
- MaxLen = length == 0 and 1000 or length,
- DV = not value and text or nil,
- V = value or text,
+ -- MaxLen = length == 0 and 1000 or length, -- only for text fields
+ MK = fieldrendering(specification),
+ -- DV = not value and text or nil, -- not in a signature
+ -- V = value or text, -- added only when signing
}
save_parent(field,specification,d)
end
@@ -1171,10 +1177,10 @@
Parent = pdfreference(parent.pobj),
F = fieldplus(specification),
OC = fieldlayer(specification),
- DA = fieldsurrounding(specification),
+ -- DA = fieldsurrounding(specification), --belongs to field
AA = fieldactions(specification),
MK = fieldrendering(specification),
- Q = fieldalignment(specification),
+ -- Q = fieldalignment(specification), --belongs to field
-- AP = pdfdictionary {
-- N = pdfreference(lpdf.flushstreamobject("q 0 0 100 100 re f Q"))
-- }
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