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https://github.com/mackysoft/unity-serializereferenceextensions
Provide popup to specify the type of the field serialized by the [SerializeReference] attribute in the inspector.
https://github.com/mackysoft/unity-serializereferenceextensions
c-sharp csharp interface polymorphism serialization serializereference unity unity-editor
Last synced: 3 days ago
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Provide popup to specify the type of the field serialized by the [SerializeReference] attribute in the inspector.
- Host: GitHub
- URL: https://github.com/mackysoft/unity-serializereferenceextensions
- Owner: mackysoft
- License: mit
- Created: 2021-04-05T16:11:49.000Z (over 3 years ago)
- Default Branch: main
- Last Pushed: 2024-10-27T10:19:04.000Z (about 2 months ago)
- Last Synced: 2024-10-29T17:11:59.393Z (about 2 months ago)
- Topics: c-sharp, csharp, interface, polymorphism, serialization, serializereference, unity, unity-editor
- Language: C#
- Homepage: https://qiita.com/makihiro_dev/items/26daeb3e5f176934bf0a
- Size: 195 KB
- Stars: 766
- Watchers: 6
- Forks: 58
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- License: LICENSE
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README
# Unity SerializeReferenceExtensions
[](https://github.com/mackysoft/Unity-SerializeReferenceExtensions/actions/workflows/build.yaml) [](https://github.com/mackysoft/Unity-SerializeReferenceExtensions/releases) [](https://openupm.com/packages/com.mackysoft.serializereference-extensions/)
**Inspired by [this post](https://qiita.com/tsukimi_neko/items/7922b2433ed4d8616cce).**
The `SerializeReference` attribute, added in Unity 2019.3, makes it possible to serialize references to interfaces and abstract classes.
The `SubclassSelector` attribute allows you to easily set subclasses of those abstract classes in the Editor that are serialized by `SerializeReference` attribute.
#### Features
- Easily set subclass by popup.
- **[New]** Type finding by fuzzy finder.
- **[New]** Override the type name and path by the `AddTypeMenu` attribute.
- **[New]** Available `CustomPropertyDrawer` for subclasses.
- **[New]** Restore values of previous object from JSON when subclass is changed. (required Unity 2021.3 or later)
- **[New]** Copy & Paste the subclass properties. (required Unity 2021.3 or later)
- **[New]** Clear & reset the subclass properties. (required Unity 2021.3 or later)
- **[New]** Covariance / Contravariance support. (required Unity 2023.2 or later)
> See below for the reason for the limitation of versions less than Unity 2021.3.
>
> https://blog.unity.com/engine-platform/serializereference-improvements-in-unity-2021-lts
## 📥 Installation
#### Install via `.unitypackage`
Download any version from releases.
Releases: https://github.com/mackysoft/Unity-SerializeReferenceExtensions/releases
#### Install via git URL
Or, you can add this package by opening PackageManager and entering
```
https://github.com/mackysoft/Unity-SerializeReferenceExtensions.git?path=Assets/MackySoft/MackySoft.SerializeReferenceExtensions
```
from the `Add package from git URL` option.
If you are specifying a version, enter `#{VERSION}` at the end, as shown below.
```
https://github.com/mackysoft/Unity-SerializeReferenceExtensions.git?path=Assets/MackySoft/MackySoft.SerializeReferenceExtensions#1.1.9
```
#### Install via Open UPM
Or, you can install this package from the [Open UPM](https://openupm.com/packages/com.mackysoft.serializereference-extensions/) registry.
More details [here](https://openupm.com/).
```
openupm add com.mackysoft.serializereference-extensions
```
## 🔰 Usage
```cs
using System;
using UnityEngine;
public class Example : MonoBehaviour {
// The type that implements ICommand will be displayed in the popup.
[SerializeReference, SubclassSelector]
ICommand m_Command;
// Collection support
[SerializeReference, SubclassSelector]
ICommand[] m_Commands = Array.Empty();
void Start () {
m_Command?.Execute();
foreach (ICommand command in m_Commands) {
command?.Execute();
}
}
// Nested type support
[Serializable]
public class NestedCommand : ICommand {
public void Execute () {
Debug.Log("Execute NestedCommand");
}
}
}
public interface ICommand {
void Execute ();
}
[Serializable]
public class DebugCommand : ICommand {
[SerializeField]
string m_Message;
public void Execute () {
Debug.Log(m_Message);
}
}
[Serializable]
public class InstantiateCommand : ICommand {
[SerializeField]
GameObject m_Prefab;
public void Execute () {
UnityEngine.Object.Instantiate(m_Prefab,Vector3.zero,Quaternion.identity);
}
}
// Menu override support
[AddTypeMenu("Example/Add Type Menu Command")]
[Serializable]
public class AddTypeMenuCommand : ICommand {
public void Execute () {
Debug.Log("Execute AddTypeMenuCommand");
}
}
[Serializable]
public struct StructCommand : ICommand {
public void Execute () {
Debug.Log("Execute StructCommand");
}
}
```
#### Supported Types
The `SubclassSelector` attribute supports types that meet the following conditions.
- Public or nested private
- Not abstract
- Not generic
- Not unity object
- Serializable attribute is applied.
## ❓ FAQ
### If the type is renamed, the reference is lost.
It is a limitation of `SerializeReference` of Unity.
When serializing a `SerializeReference` reference, the type name, namespace, and assembly name are used, so if any of these are changed, the reference cannot be resolved during deserialization.
To solve this problem, `UnityEngine.Scripting.APIUpdating.MovedFromAttribute` can be used.
Also, [this thread](https://forum.unity.com/threads/serializereference-data-loss-when-class-name-is-changed.736874/) will be helpful.
#### References
- https://forum.unity.com/threads/serializereference-data-loss-when-class-name-is-changed.736874/
- https://issuetracker.unity3d.com/issues/serializereference-serialized-reference-data-lost-when-the-class-name-is-refactored
I welcome feature requests and bug reports in [issues](https://github.com/mackysoft/XPool/issues) and [pull requests](https://github.com/mackysoft/XPool/pulls).
If you feel that my works are worthwhile, I would greatly appreciate it if you could sponsor me.
GitHub Sponsors: https://github.com/sponsors/mackysoft