Any way to expose C# interfaces to the inspector and choose which class, struct or script to instantiate?

mvinicius2k · December 4, 2023, 2:00am

The value instantiated is shown in inspector only when the field is initialized. But when the field is uninitialized the inspector show “null”. Is possible choose an object that implements that interface by inspector?

mafiesto4 · December 5, 2023, 8:45am

We do have feature for objects of specific type where user can click small + button to create object of that type. Maybe in future we could add sth similar for interfaces with picker for object type.

mvinicius2k · December 7, 2023, 1:10pm

Thanks. Exploring the source code I found these files

github.com

FlaxEngine/FlaxEngine/blob/74b77bfa4ce499a0497526b4e4ea84d48bb8b429/Source/Editor/CustomEditors/Editors/ObjectSwitcherEditor.cs

// Copyright (c) 2012-2023 Wojciech Figat. All rights reserved.

using System;
using FlaxEditor.GUI;
using FlaxEditor.Scripting;
using FlaxEngine.Utilities;

namespace FlaxEditor.CustomEditors.Editors
{
    /// <summary>
    /// Base implementation of the inspector used to edit properties of the given abstract or interface type that contain a setter to assign a derived implementation type.
    /// </summary>
    public abstract class ObjectSwitcherEditor : CustomEditor
    {
        /// <summary>
        /// Defines type that can be assigned to the modified property.
        /// </summary>
        public struct OptionType
        {
            /// <summary>

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github.com

FlaxEngine/FlaxEngine/blob/74b77bfa4ce499a0497526b4e4ea84d48bb8b429/Source/Editor/CustomEditors/Editors/IBrushEditor.cs

// Copyright (c) 2012-2023 Wojciech Figat. All rights reserved.

using FlaxEngine;
using FlaxEngine.GUI;

namespace FlaxEditor.CustomEditors.Editors
{
    /// <summary>
    /// Default implementation of the inspector used to edit <see cref="IBrush"/> type properties.
    /// </summary>
    /// <seealso cref="IBrush"/>
    /// <seealso cref="ObjectSwitcherEditor"/>
    [CustomEditor(typeof(IBrush)), DefaultEditor]
    public sealed class IBrushEditor : ObjectSwitcherEditor
    {
        /// <inheritdoc />
        protected override OptionType[] Options => new[]
        {
            new OptionType("null", null),
            new OptionType("Texture", typeof(TextureBrush)),

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Extend the ObjectSwitcherEditor for a interface works, except the types that are script, the field resets when toggle to play mode