Question by UnityAccnt · Oct 02, 2019 at 12:59 AM · editor serialization editorguilayout serializedproperty serializedobject

Display function parameters in inspector

Basically trying to make my own version of the UnityEvents in the inspector, you place this script on a game object and it populates a dropdown with all the public functions. I've gotten pretty far, but I want it to create property fields for the parameters in the selected function, I'm not sure how to do it though, been trying to figure this out for quite a while to no avail.

The script to get the functions and parameters.

[ExecuteInEditMode] public class MageInteraction : MonoBehaviour {

 // For displaying the initial option in the custom editor
 public int index;
 // For getting the right methods
 public MonoBehaviour[] monoBehaviours;
 public List<MethodInfo> methods = new List<MethodInfo>();
 public List<string> methodNames = new List<string>();
 public Dictionary<string, ParameterInfo[]> methodParameters = new Dictionary<string, ParameterInfo[]>();

 private BindingFlags flags = BindingFlags.Instance | BindingFlags.Public | BindingFlags.DeclaredOnly;

 // Start is called before the first frame update
 void Start()
 {
     monoBehaviours = gameObject.GetComponents<MonoBehaviour>();
     GetFunctions();
 }

 // Update is called once per frame
 void Update()
 {
     //GetFunction();
 }

 void GetFunctions()
 {
     // Add all the methods found in the script to the list
     foreach (MonoBehaviour element in monoBehaviours)
     {
         methods.AddRange(element.GetType().GetMethods(flags));
     }

     methodNames.Clear();

     foreach (MethodInfo element in methods)
     {
         // Add all the names of the methods to a list
         methodNames.Add(element.ToString());
         // Add all the Parameters to the dictionary
         methodParameters.Add(element.ToString(), element.GetParameters());
         Debug.Log("Parameters " + methodParameters[element.ToString()].ToStringFull());
     }

     Debug.Log(methodNames.ToArray().ToStringFull());
 }

}

The custom editor to display the functions in the inspector

[CustomEditor(typeof(MageInteraction))] [CanEditMultipleObjects] public class MageInteractionEditor : Editor { public override void OnInspectorGUI() { // Update the serializedProperty - always do this in the beginning of OnInspectorGUI. serializedObject.Update();

     MageInteraction mageInteraction = (MageInteraction)target;

     // Create the dropdown in the inspector for the found methods 
     mageInteraction.index = EditorGUILayout.Popup("Function", mageInteraction.index, mageInteraction.methodNames.ToArray());
     //Debug.Log(mageInteraction.index);

     // Create a propertyfield array as large as the ParameterInfo array retrieved by getParameters
     EditorGUILayout[] guiLayouts = new EditorGUILayout[mageInteraction.methodParameters[mageInteraction.methodNames[mageInteraction.index]].Length];
     Debug.Log("GUILayouts Length: " + guiLayouts.Length);

     for (int i = 0; i < guiLayouts.Length; i++)
     {
         // Create property fields for each parameter found in the method
         //SerializedProperty prop = serializedObject.FindProperty(mageInteraction.methodParameters[mageInteraction.methodNames[mageInteraction.index]][i].Name);
         SerializedProperty prop = serializedObject.FindProperty(mageInteraction.methodParameters["Void OpenChest(Int32, System.String)"][i].Name);
         Debug.Log("SerializedProperty: " + prop);
         Debug.Log("ParameterName: " + mageInteraction.methodParameters["Void OpenChest(Int32, System.String)"][i].Name);
         //guiLayouts[i] = EditorGUILayout.PropertyField(prop);
     }

     // Apply changes to the serializedProperty - always do this in the end of OnInspectorGUI.
     serializedObject.ApplyModifiedProperties();
 }

What it looks like in the inspector alt text