How do you get a list of project scripts at edit-time?

Question

I have a custom class called MyCustomClass.

I would like to provide a UI selector in the editor so that the user can choose from one of their own classes that derives from MyCustomClass.

Either something similar to an ObjectField (which doesn't work for this purpose) where a user can open up a selector that lists all the objects you specify, or, a dropdown menu that lists all the objects you specify.

Then when the user selects one, I can set a backing variable to the user's choice, and store it on another class for later use at runtime.

My question is, how do I obtain a list of classes from within an editor script, both a CustomInspector, and an EditorWindow?

EditorGUILayout.ObjectField doesn't seem to work. I get an "InvalidCastException" error, yet when I print the member I feed that function, and the returned result, both print as being of type MyCustomClass. So I think that is an editor bug. I also tried Object.FindObjectsOfTypeIncludingAssets however I see some strange behaviour with this, as follows:

 // Returns all meshes.
 Mesh[] meshes = (Mesh[])Object.FindObjectsOfTypeIncludingAssets( typeof( Mesh ) );

 // Returns all shaders, including built in shaders.
 Shaders[] shaders = (Shader[])Object.FindObjectsOfTypeIncludingAssets( typeof( Shader ) );
     
 // Returns every single asset.
 MyCustomClass[] myClasses = (MyCustomClass[])Object.FindObjectsOfTypeIncludingAssets( typeof( MyCustomClass) );

Any information and help appreciated, perhaps there is a solution I have not considered, and am approaching this the wrong way.

Answer 1

Best Answer

Answer by Ian Smithers · Jan 03, 2013 at 10:20 AM

Hello, I managed to find a solution as follows - hope this helps if anyone has a similar task:

     public static MonoScript[] GetScriptAssetsOfType<T>()
     {
         MonoScript[] scripts = (MonoScript[])Object.FindObjectsOfTypeIncludingAssets( typeof( MonoScript ) );
         
         List<MonoScript> result = new List<MonoScript>();
         
         foreach( MonoScript m in scripts )
         {
             if( m.GetClass() != null && m.GetClass().IsSubclassOf( typeof( T ) ) )
             {
                 result.Add( m );
             }
         }
         return result.ToArray();
     }

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Shinzironine · Apr 01, 2014 at 10:39 AM 0

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Unity crashes when I iterate over array "scripts". I'm calling your method OnGui in editor script. Do you know why this could happen?

Shinzironine · Apr 02, 2014 at 05:38 AM 0

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The problem was in the fact that the script is also finding Shaders, so you need an additional check. s.GetType() != typeof(Shader)

Answer 2

Answer by CodeMasterMike · Jan 03, 2013 at 06:30 AM

When I retrieve all methods from a single script, I use reflection to get a list of all methods:

 Assembly []referencedAssemblies = System.AppDomain.CurrentDomain.GetAssemblies();
 for(int i = 0; i < referencedAssemblies.Length; ++i)
 {
     System.Type type = referencedAssemblies[i].GetType( scriptNameString );
     
     if( type != null )
     {    // I want all the declared methods from the specific class.
         System.Reflection.MethodInfo []methods = type.GetMethods(BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.DeclaredOnly);
     }
 }

Maybe you can use some similar way to get out all classes from a single script.

Good luck!

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Ian Smithers · Jan 03, 2013 at 06:36 AM 0

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Thanks for the post, I realized my question title could have been misleading so I edited it. For clarification, I need to get a list of all the scripts in the project, that match a certain type, at edit-time. So lets say I have 100 scripts, and 25 of them all derive from MyCustomClass, I want to let the user choose one of these from a custom editor UI. Currently I can only get Unity assets (such as Meshes or Shaders) or all assets, as in my code snippet. Hopefully that clears it up, thanks again, cheers!

CodeMasterMike · Jan 03, 2013 at 06:41 AM 0

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Ah, okey that makes it a little clearer.

You can get all scripts (which are monobehavior type scripts) by this function:

 Component []objectCompoentList = currentGameObject.GetComponents(typeof(MonoBehaviour));

Maybe you can sort out those who aren't derived from the MyCustomClass somehow.

Ian Smithers · Jan 03, 2013 at 06:45 AM 0

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That will get scripts from a selected GameObject, but I am attempting to get the scripts in the project, the actual raw script assets themselves, similar to how they appear in the project view - except I wish to filter them and then display a filtered list of them in the custom editor.

Answer 3

Answer by glitchers · Jul 15, 2016 at 09:54 AM

Unity has made Object. FindObjectsOfTypeIncludingAssets obsolete and recommends you use Resources. FindObjectsOfTypeAll but this will not find all assets.

I have written a small piece of code that you can use in Editor only that takes a generic type and will return all objects in your project regardless of if they have been loaded yet.

 public static List<T> FindAssetsByType<T>() where T : UnityEngine.Object
 {
     List<T> assets = new List<T>();

     string[] guids = AssetDatabase.FindAssets(string.Format("t:{0}", typeof(T)));

     for( int i = 0; i < guids.Length; i++ )
     {
         string assetPath = AssetDatabase.GUIDToAssetPath( guids[i] );
         T asset = AssetDatabase.LoadAssetAtPath<T>( assetPath );

         if( asset != null )
         {
             assets.Add(asset);
         }
     }
     return assets;
 }

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How do you get a list of project scripts at edit-time?

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