dotnet/src/webdriver/BiDi/Input/Origin.cs

// <copyright file="Origin.cs" company="Selenium Committers">
// Licensed to the Software Freedom Conservancy (SFC) under one
// or more contributor license agreements.  See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.  The SFC licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License.  You may obtain a copy of the License at
//
//   http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied.  See the License for the
// specific language governing permissions and limitations
// under the License.
// </copyright>

using System.Text.Json;
using System.Text.Json.Serialization;
using OpenQA.Selenium.BiDi.Json;

namespace OpenQA.Selenium.BiDi.Input;

[JsonConverter(typeof(Converter))]
public abstract record Origin
{
    internal sealed class Converter : JsonConverter<Origin>
    {
        public override Origin Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
        {
            throw new NotImplementedException();
        }

        public override void Write(Utf8JsonWriter writer, Origin value, JsonSerializerOptions options)
        {
            if (value is ViewportOrigin)
            {
                writer.WriteStringValue("viewport");
            }
            else if (value is PointerOrigin)
            {
                writer.WriteStringValue("pointer");
            }
            else if (value is ElementOrigin element)
            {
                writer.WriteStartObject();
                writer.WriteString("type", "element");
                writer.WritePropertyName("element");

                JsonSerializer.Serialize(writer, element.Element, options.GetTypeInfo<Script.ISharedReference>());

                writer.WriteEndObject();
            }
        }
    }
}

public sealed record ViewportOrigin() : Origin;

public sealed record PointerOrigin() : Origin;

public sealed record ElementOrigin(Script.ISharedReference Element) : Origin;