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;
+
+namespace PdfSharpCore.Pdf.AcroForms
+{
+    /// <summary>
+    /// Represents the radio button field.
+    /// </summary>
+    public sealed class PdfRadioButtonField : PdfButtonField
+    {
+        /// <summary>
+        /// Initializes a new instance of PdfRadioButtonField.
+        /// </summary>
+        internal PdfRadioButtonField(PdfDocument document)
+            : base(document)
+        {
+            _document = document;
+        }
+
+        internal PdfRadioButtonField(PdfDictionary dict)
+            : base(dict)
+        { }
+
+        /// <summary>
+        /// Gets or sets the index of the selected radio button in a radio button group.
+        /// </summary>
+        public int SelectedIndex
+        {
+            get
+            {
+                string value = Elements.GetString(Keys.V);
+                return IndexInOptStrings(value);
+            }
+            set
+            {
+                PdfArray opt = Elements[Keys.Opt] as PdfArray;
+
+                if (opt == null)
+                    opt = Elements[Keys.Kids] as PdfArray;
+
+                if (opt != null)
+                {
+                    int count = opt.Elements.Count;
+                    if (value < 0 || value >= count)
+                        throw new ArgumentOutOfRangeException("value");
+                    Elements.SetName(Keys.V, opt.Elements[value].ToString());
+                }
+            }
+        }
+
+        int IndexInOptStrings(string value)
+        {
+            PdfArray opt = Elements[Keys.Opt] as PdfArray;
+            if (opt != null)
+            {
+                int count = opt.Elements.Count;
+                for (int idx = 0; idx < count; idx++)
+                {
+                    PdfItem item = opt.Elements[idx];
+                    if (item is PdfString)
+                    {
+                        if (item.ToString() == value)
+                            return idx;
+                    }
+                }
+            }
+            return -1;
+        }
+
+        /// <summary>
+        /// Predefined keys of this dictionary. 
+        /// The description comes from PDF 1.4 Reference.
+        /// </summary>
+        public new class Keys : PdfButtonField.Keys
+        {
+            /// <summary>
+            /// (Optional; inheritable; PDF 1.4) An array of text strings to be used in
+            /// place of the V entries for the values of the widget annotations representing
+            /// the individual radio buttons. Each element in the array represents
+            /// the export value of the corresponding widget annotation in the
+            /// Kids array of the radio button field.
+            /// </summary>
+            [KeyInfo(KeyType.Array | KeyType.Optional)]
+            public const string Opt = "/Opt";
+
+            /// <summary>
+            /// Gets the KeysMeta for these keys.
+            /// </summary>
+            internal static DictionaryMeta Meta
+            {
+                get { return _meta ?? (_meta = CreateMeta(typeof(Keys))); }
+            }
+            static DictionaryMeta _meta;
+        }
+
+        /// <summary>
+        /// Gets the KeysMeta of this dictionary type.
+        /// </summary>
+        internal override DictionaryMeta Meta
+        {
+            get { return Keys.Meta; }
+        }
+    }
+}