From eb253f8417815720d051a24b51e6491a6f51aa9c Mon Sep 17 00:00:00 2001
From: Jakub Melka <Jakub.Melka@seznam.cz>
Date: Fri, 11 Sep 2020 18:03:23 +0200
Subject: [PATCH] Default values for structure tree attributes

---
 PdfForQtLib/sources/pdfstructuretree.cpp | 60 ++++++++++++++++++++++++
 PdfForQtLib/sources/pdfstructuretree.h   |  4 +-
 2 files changed, 63 insertions(+), 1 deletion(-)

diff --git a/PdfForQtLib/sources/pdfstructuretree.cpp b/PdfForQtLib/sources/pdfstructuretree.cpp
index d9bfaee..969a7d6 100644
--- a/PdfForQtLib/sources/pdfstructuretree.cpp
+++ b/PdfForQtLib/sources/pdfstructuretree.cpp
@@ -112,6 +112,7 @@ static constexpr std::array<const PDFStructureTreeAttributeDefinition, PDFStruct
     PDFStructureTreeAttributeDefinition(PDFStructureTreeAttribute::Attribute::TPadding, "TPadding", true),
     PDFStructureTreeAttributeDefinition(PDFStructureTreeAttribute::Attribute::LineHeight, "LineHeight", true),
     PDFStructureTreeAttributeDefinition(PDFStructureTreeAttribute::Attribute::BaselineShift, "BaselineShift", false),
+    PDFStructureTreeAttributeDefinition(PDFStructureTreeAttribute::Attribute::TextPosition, "TextPosition", false),
     PDFStructureTreeAttributeDefinition(PDFStructureTreeAttribute::Attribute::TextDecorationType, "TextDecorationType", true),
     PDFStructureTreeAttributeDefinition(PDFStructureTreeAttribute::Attribute::TextDecorationColor, "TextDecorationColor", true),
     PDFStructureTreeAttributeDefinition(PDFStructureTreeAttribute::Attribute::TextDecorationThickness, "TextDecorationThickness", true),
@@ -283,6 +284,65 @@ bool PDFStructureTreeAttribute::isInheritable() const
     return m_definition->inheritable;
 }
 
+PDFObject PDFStructureTreeAttribute::getDefaultValue() const
+{
+    switch (m_definition->type)
+    {
+        case PDFStructureTreeAttribute::WritingMode:
+            return PDFObject::createName("LrTb");
+
+        case PDFStructureTreeAttribute::BorderStyle:
+        case PDFStructureTreeAttribute::TBorderStyle:
+        case PDFStructureTreeAttribute::TextDecorationType:
+        case PDFStructureTreeAttribute::ListNumbering:
+            return PDFObject::createName("None");
+
+        case PDFStructureTreeAttribute::BorderThickness:
+        case PDFStructureTreeAttribute::Padding:
+        case PDFStructureTreeAttribute::SpaceBefore:
+        case PDFStructureTreeAttribute::SpaceAfter:
+        case PDFStructureTreeAttribute::StartIndent:
+        case PDFStructureTreeAttribute::EndIndent:
+        case PDFStructureTreeAttribute::TextIndent:
+        case PDFStructureTreeAttribute::TPadding:
+        case PDFStructureTreeAttribute::BaselineShift:
+            return PDFObject::createReal(0.0);
+
+        case PDFStructureTreeAttribute::TextAlign:
+        case PDFStructureTreeAttribute::InlineAlign:
+            return PDFObject::createName("Start");
+
+        case PDFStructureTreeAttribute::Width:
+        case PDFStructureTreeAttribute::Height:
+        case PDFStructureTreeAttribute::GlyphOrientationVertical:
+            return PDFObject::createName("Auto");
+
+        case PDFStructureTreeAttribute::BlockAlign:
+        case PDFStructureTreeAttribute::RubyPosition:
+            return PDFObject::createName("Before");
+
+        case PDFStructureTreeAttribute::LineHeight:
+        case PDFStructureTreeAttribute::TextPosition:
+            return PDFObject::createName("Normal");
+
+        case PDFStructureTreeAttribute::RubyAlign:
+            return PDFObject::createName("Distribute");
+
+        case PDFStructureTreeAttribute::ColumnCount:
+        case PDFStructureTreeAttribute::RowSpan:
+        case PDFStructureTreeAttribute::ColSpan:
+            return PDFObject::createInteger(1);
+
+        case PDFStructureTreeAttribute::Checked:
+            return PDFObject::createName("off");
+
+        default:
+            break;
+    }
+
+    return PDFObject();
+}
+
 QString PDFStructureTreeAttribute::getUserPropertyName(const PDFObjectStorage* storage) const
 {
     if (const PDFDictionary* value = storage->getDictionaryFromObject(m_value))
diff --git a/PdfForQtLib/sources/pdfstructuretree.h b/PdfForQtLib/sources/pdfstructuretree.h
index c89c012..1bb1faa 100644
--- a/PdfForQtLib/sources/pdfstructuretree.h
+++ b/PdfForQtLib/sources/pdfstructuretree.h
@@ -99,6 +99,7 @@ public:
         TPadding,
         LineHeight,
         BaselineShift,
+        TextPosition,
         TextDecorationType,
         TextDecorationColor,
         TextDecorationThickness,
@@ -154,7 +155,8 @@ public:
     /// Returns attribute value
     const PDFObject& getValue() const { return m_value; }
 
-    /// Returns default attribute value
+    /// Returns default attribute value. If default attribute value
+    /// cannot be determined, empty object is returned.
     PDFObject getDefaultValue() const;
 
     /// Returns user property name. This function should be called only for