// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
 
using System.CodeDom;
using System.Collections;
using System.ComponentModel;
using System.ComponentModel.Design.Serialization;
 
namespace System.Windows.Forms.Design;
 
public partial class ControlDesigner
{
    // Custom code dom serializer for the DesignerControlCollection. We need this so we can filter out controls
    // that aren't sited in the host's container.
    internal class DesignerControlCollectionCodeDomSerializer : CollectionCodeDomSerializer
    {
        protected override object? SerializeCollection(
            IDesignerSerializationManager manager,
            CodeExpression? targetExpression,
            Type targetType,
            ICollection originalCollection,
            ICollection valuesToSerialize)
        {
            List<IComponent> subset = [];
            if (valuesToSerialize is not null && valuesToSerialize.Count > 0)
            {
                foreach (object val in valuesToSerialize)
                {
                    if (val is IComponent { Site: not null and not INestedSite } comp)
                    {
                        subset.Add(comp);
                    }
                }
            }
 
            return base.SerializeCollection(manager, targetExpression, targetType, originalCollection, subset);
        }
    }
}