#region PDFsharp - A .NET library for processing PDF
//
// Authors:
//   Stefan Lange
//
// Copyright (c) 2005-2017 empira Software GmbH, Cologne Area (Germany)
//
// http://www.pdfsharp.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

#if GDI
using System.Drawing;
using System.Drawing.Imaging;
#endif
#if WPF
using System.Windows.Media;
#endif

namespace PdfSharp.Pdf.Advanced
{
    /// <summary>
    /// Represents a PDF group XObject.
    /// </summary>
    public abstract class PdfGroupAttributes : PdfDictionary
    {
        internal PdfGroupAttributes(PdfDocument thisDocument)
            : base(thisDocument)
        {
            Elements.SetName(Keys.Type, "/Group");
        }

        /// <summary>
        /// Predefined keys of this dictionary.
        /// </summary>
        public class Keys : KeysBase
        {
            /// <summary>
            ///(Optional) The type of PDF object that this dictionary describes;
            ///if present, must be Group for a group attributes dictionary.
            /// </summary>
            [KeyInfo(KeyType.Name | KeyType.Optional)]
            public const string Type = "/Type";

            /// <summary>
            /// (Required) The group subtype, which identifies the type of group whose
            /// attributes this dictionary describes and determines the format and meaning
            /// of the dictionary’s remaining entries. The only group subtype defined in
            /// PDF 1.4 is Transparency. Other group subtypes may be added in the future.
            /// </summary>
            [KeyInfo(KeyType.Name | KeyType.Required)]
            public const string S = "/S";

            /// <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; }
        }
    }
}