AutoPatientInfoRecorder/src/AntdUI/Lib/SVG/Document Structure/SvgUse.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 System;
using System.Collections.Generic;
using System.Drawing;
using System.Drawing.Drawing2D;

namespace AntdUI.Svg
{
    public class SvgUse : SvgVisualElement
    {
        public override string ClassName { get => "use"; }

        private Uri _referencedElement;

        [SvgAttribute("href", SvgAttributeAttribute.XLinkNamespace)]
        public virtual Uri ReferencedElement
        {
            get { return _referencedElement; }
            set { _referencedElement = value; }
        }

        private bool ElementReferencesUri(SvgElement element, List<Uri> elementUris)
        {
            var useElement = element as SvgUse;
            if (useElement != null)
            {
                if (elementUris.Contains(useElement.ReferencedElement))
                {
                    return true;
                }
                // also detect cycles in referenced elements
                var refElement = OwnerDocument.IdManager.GetElementById(useElement.ReferencedElement);
                if (refElement is SvgUse)
                {
                    elementUris.Add(useElement.ReferencedElement);
                }
                return useElement.ReferencedElementReferencesUri(elementUris);
            }
            var groupElement = element as SvgGroup;
            if (groupElement != null)
            {
                foreach (var child in groupElement.Children)
                {
                    if (ElementReferencesUri(child, elementUris))
                    {
                        return true;
                    }
                }
            }
            return false;
        }

        private bool ReferencedElementReferencesUri(List<Uri> elementUris)
        {
            var refElement = OwnerDocument.IdManager.GetElementById(ReferencedElement);
            return ElementReferencesUri(refElement, elementUris);