From 397b097c469db89a49e5a6c2035a0beee2e4d117 Mon Sep 17 00:00:00 2001
From: Jay Berkenbilt <ejb@ql.org>
Date: Thu, 21 Jun 2018 15:00:00 -0400
Subject: Allow setting a form field's value

---
 libqpdf/QPDFAcroFormDocumentHelper.cc | 35 +++++++++++++++++++++++++++++
 libqpdf/QPDFFormFieldObjectHelper.cc  | 42 +++++++++++++++++++++++++++++++++++
 2 files changed, 77 insertions(+)

(limited to 'libqpdf')

diff --git a/libqpdf/QPDFAcroFormDocumentHelper.cc b/libqpdf/QPDFAcroFormDocumentHelper.cc
index 7e70fd92..46648ed9 100644
--- a/libqpdf/QPDFAcroFormDocumentHelper.cc
+++ b/libqpdf/QPDFAcroFormDocumentHelper.cc
@@ -250,3 +250,38 @@ QPDFAcroFormDocumentHelper::traverseField(
             QPDFFormFieldObjectHelper(our_field);
     }
 }
+
+bool
+QPDFAcroFormDocumentHelper::getNeedAppearances()
+{
+    bool result = false;
+    QPDFObjectHandle acroform = this->qpdf.getRoot().getKey("/AcroForm");
+    if (acroform.isDictionary() &&
+        acroform.getKey("/NeedAppearances").isBool())
+    {
+        result = acroform.getKey("/NeedAppearances").getBoolValue();
+    }
+    return result;
+}
+
+void
+QPDFAcroFormDocumentHelper::setNeedAppearances(bool val)
+{
+    QPDFObjectHandle acroform = this->qpdf.getRoot().getKey("/AcroForm");
+    if (! acroform.isDictionary())
+    {
+        this->qpdf.getRoot().warnIfPossible(
+            "ignoring call to QPDFAcroFormDocumentHelper::setNeedAppearances"
+            " on a file that lacks an /AcroForm dictionary");
+        return;
+    }
+    if (val)
+    {
+        acroform.replaceKey("/NeedAppearances",
+                            QPDFObjectHandle::newBool(true));
+    }
+    else
+    {
+        acroform.removeKey("/NeedAppearances");
+    }
+}
diff --git a/libqpdf/QPDFFormFieldObjectHelper.cc b/libqpdf/QPDFFormFieldObjectHelper.cc
index e6445af3..283b632d 100644
--- a/libqpdf/QPDFFormFieldObjectHelper.cc
+++ b/libqpdf/QPDFFormFieldObjectHelper.cc
@@ -1,5 +1,6 @@
 #include <qpdf/QPDFFormFieldObjectHelper.hh>
 #include <qpdf/QTC.hh>
+#include <qpdf/QPDFAcroFormDocumentHelper.hh>
 
 QPDFFormFieldObjectHelper::Members::~Members()
 {
@@ -188,3 +189,44 @@ QPDFFormFieldObjectHelper::getQuadding()
     }
     return result;
 }
+
+void
+QPDFFormFieldObjectHelper::setFieldAttribute(
+    std::string const& key, QPDFObjectHandle value)
+{
+    this->oh.replaceKey(key, value);
+}
+
+void
+QPDFFormFieldObjectHelper::setFieldAttribute(
+    std::string const& key, std::string const& utf8_value)
+{
+    this->oh.replaceKey(key, QPDFObjectHandle::newUnicodeString(utf8_value));
+}
+
+void
+QPDFFormFieldObjectHelper::setV(
+    QPDFObjectHandle value, bool need_appearances)
+{
+    setFieldAttribute("/V", value);
+    if (need_appearances)
+    {
+        QPDF* qpdf = this->oh.getOwningQPDF();
+        if (! qpdf)
+        {
+            throw std::logic_error(
+                "QPDFFormFieldObjectHelper::setV called with"
+                " need_appearances = true on an object that is"
+                " not associated with an owning QPDF");
+        }
+        QPDFAcroFormDocumentHelper(*qpdf).setNeedAppearances(true);
+    }
+}
+
+void
+QPDFFormFieldObjectHelper::setV(
+    std::string const& utf8_value, bool need_appearances)
+{
+    setV(QPDFObjectHandle::newUnicodeString(utf8_value),
+         need_appearances);
+}
-- 
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