vendor: import KillerPDF 1.7.5 source (GPL-3.0) as the base for MMD PDF

2026-08-27 06:58:22 +02:00
commit 532485a830
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+#region PDFsharp - A .NET library for processing PDF
+//
+// Authors:
+//   Stefan Lange
+//
+// Copyright (c) 2005-2016 empira Software GmbH, Cologne Area (Germany)
+//
+// http://www.PdfSharpCore.com
+// http://sourceforge.net/projects/pdfsharp
+//
+// Permission is hereby granted, free of charge, to any person obtaining a
+// copy of this software and associated documentation files (the "Software"),
+// to deal in the Software without restriction, including without limitation
+// the rights to use, copy, modify, merge, publish, distribute, sublicense,
+// and/or sell copies of the Software, and to permit persons to whom the
+// Software is furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included
+// in all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 
+// DEALINGS IN THE SOFTWARE.
+#endregion
+
+using System;
+using System.Collections.Generic;
+using System.Diagnostics;
+using PdfSharpCore.Pdf.Annotations;
+
+namespace PdfSharpCore.Pdf.AcroForms
+{
+    /// <summary>
+    /// Represents the base class for all button fields.
+    /// </summary>
+    public abstract class PdfButtonField : PdfAcroField
+    {
+        /// <summary>
+        /// Initializes a new instance of the <see cref="PdfButtonField"/> class.
+        /// </summary>
+        protected PdfButtonField(PdfDocument document)
+            : base(document)
+        { }
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="PdfButtonField"/> class.
+        /// </summary>
+        protected PdfButtonField(PdfDictionary dict)
+            : base(dict)
+        { }
+
+        /// <summary>
+        /// Gets the name which represents the opposite of /Off.
+        /// </summary>
+        protected string GetNonOffValue()
+        {
+            // Try to get the information from the appearance dictionaray.
+            // Just return the first key that is not /Off.
+            // I'm not sure what is the right solution to get this value.
+            PdfDictionary ap = Elements[PdfAnnotation.Keys.AP] as PdfDictionary;
+            if (ap != null)
+            {
+                PdfDictionary n = ap.Elements["/N"] as PdfDictionary;
+                if (n != null)
+                {
+                    foreach (string name in n.Elements.Keys)
+                        if (name != "/Off")
+                            return name;
+                }
+            }
+            return null;
+        }
+
+        internal override void GetDescendantNames(ref List<string> names, string partialName)
+        {
+            string t = Elements.GetString(PdfAcroField.Keys.T);
+            // HACK: ??? 
+            if (t == "")
+                t = "???";
+            Debug.Assert(t != "");
+            if (t.Length > 0)
+            {
+                if (!String.IsNullOrEmpty(partialName))
+                    names.Add(partialName + "." + t);
+                else
+                    names.Add(t);
+            }
+        }
+
+        /// <summary>
+        /// Predefined keys of this dictionary. 
+        /// The description comes from PDF 1.4 Reference.
+        /// </summary>
+        public new class Keys : PdfAcroField.Keys
+        {
+            // Pushbuttons have no additional entries.
+        }
+    }
+}