AutoPatientInfoRecorder/src/AntdUI/Lib/SVG/SvgDocument.cs

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// THIS FILE IS PART OF SVG PROJECT
// THE SVG PROJECT IS AN OPENSOURCE LIBRARY LICENSED UNDER THE MS-PL License.
// COPYRIGHT (C) svg-net. ALL RIGHTS RESERVED.
// GITHUB: https://github.com/svg-net/SVG

using AntdUI.Svg.Exceptions;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Xml;

namespace AntdUI.Svg
{
    /// <summary>
    /// The class used to create and load SVG documents.
    /// </summary>
    public class SvgDocument : SvgFragment, ITypeDescriptorContext
    {
        private SvgElementIdManager _idManager;

        private Dictionary<string, IEnumerable<SvgFontFace>> _fontDefns = null;

        internal Dictionary<string, IEnumerable<SvgFontFace>> FontDefns()
        {
            if (_fontDefns == null)
            {
                _fontDefns = (from f in Descendants().OfType<SvgFontFace>()
                              group f by f.FontFamily into family
                              select family).ToDictionary(f => f.Key, f => (IEnumerable<SvgFontFace>)f);
            }
            return _fontDefns;
        }

        public Uri BaseUri { get; set; }

        /// <summary>
        /// Gets an <see cref="SvgElementIdManager"/> for this document.
        /// </summary>
        protected internal virtual SvgElementIdManager IdManager
        {
            get
            {
                if (_idManager == null)
                {
                    _idManager = new SvgElementIdManager(this);
                }

                return _idManager;
            }
        }

        /// <summary>
        /// Overwrites the current IdManager with a custom implementation. 
        /// Be careful with this: If elements have been inserted into the document before,
        /// you have to take care that the new IdManager also knows of them.
        /// </summary>
        /// <param name="manager"></param>