Class that lets you edit key/value pair thingies

gistfile1.cs

[System.Serializable]
public class PrefabsAndGhosts
{
	public static string unnamedPrefabName = "New Prefab";
	public bool ghostsExpanded = false;
	public bool prefabsExpanded = false;
	public const string UniqueIndicator = "-";
	public PrefabRef newPrefab = new PrefabRef();
	PrefabRef[] prefabs = new PrefabRef[] {};
	List<PrefabRef> deleteEntries = new List<PrefabRef>();
	public bool DrawPrefabsFoldout(Object parent, List<PrefabRef> prefabList) {
		prefabsExpanded = EditorGUILayout.Foldout(prefabsExpanded, "Prefabs");
		if (prefabsExpanded) {
			DrawPrefabs(parent, prefabList);
		}
		return prefabsExpanded;
	}
	public void DrawPrefabs(Object parent, List<PrefabRef> prefabList) {
		// we need to avoid mutating the list between the layout and repaint event
		// this is a quick hack to accomplish that:
		// Todo: be more explicit about handling layout / Repaint events.
		bool isDirty = false;
		if (Event.current.type == EventType.layout) {
			if (deleteEntries.Count > 0) {
				Undo.RegisterUndo(EditorUtility.CollectDeepHierarchy(new Object[] {parent}), "Delete Prefab");
				foreach (PrefabRef pr in deleteEntries) {
					prefabList.Remove(pr);
					isDirty = true;
				}
				deleteEntries.Clear();
			}
			prefabs = prefabList.ToArray();
		}
		List<string> similarNames = new List<string>();
		string withFocus = string.Empty;
		for (int i=0; i< prefabs.Length; i++) {
			EditorGUILayout.BeginHorizontal();
			EditorGUIUtility.LookLikeInspector();
			GUILayout.Space(12);
			PrefabRef pr = prefabs[i];
			// only for backward compatibility, delete soon
			if (string.IsNullOrEmpty(pr.name)) {
				pr.name = pr.prefab.name;
			}
			if (string.IsNullOrEmpty(pr.newName)) {
				pr.newName = pr.name;
			} 
			GUI.SetNextControlName(parent.name + "_prefabName"+i);
			string changedName = EditorGUILayout.TextField(pr.newName);
			if (changedName != pr.newName) {
				Undo.RegisterUndo(EditorUtility.CollectDeepHierarchy(new Object[] {parent}), "Change Prefab Name");
				pr.newName = changedName;
			}
			withFocus = GUI.GetNameOfFocusedControl();
			if (withFocus != parent.name + "_prefabName"+i && pr.newName != pr.name) {
				foreach (PrefabRef pre in prefabs) {
					if (pre.name == pre.newName && pre.name.Contains(pr.newName)) similarNames.Add(pre.name);
				}
				string newName = pr.newName;
				pr.newName = pr.name;
				Undo.RegisterUndo(EditorUtility.CollectDeepHierarchy(new Object[] {parent}), "Change Prefab Name");
				pr.name = Util.MakeUnique(newName, UniqueIndicator, similarNames);
				pr.newName = pr.name;
				similarNames.Clear();
			}
			GUI.SetNextControlName(parent.name + "_prefab"+i);
			GameObject updatePrefab = (GameObject) EditorGUILayout.ObjectField(pr.prefab, typeof(GameObject), false);
			withFocus = GUI.GetNameOfFocusedControl();
			if (updatePrefab != pr.prefab) {
				Undo.RegisterUndo(EditorUtility.CollectDeepHierarchy(new Object[] {parent}), "Change Prefab Reference");
				if (pr.name.StartsWith(pr.prefab.name)) {
					foreach (PrefabRef pre in prefabs) {
						if (pre != pr && pre.name.Contains(updatePrefab.name)) similarNames.Add(pre.name);
					}
					pr.name = Util.MakeUnique(updatePrefab.name, UniqueIndicator, similarNames);
					pr.newName = pr.name;
					similarNames.Clear();
				}
				pr.prefab = updatePrefab;
			}
			EditorGUIUtility.LookLikeControls();
			if (GUILayout.Button("-", GUILayout.Width(21))) {
				deleteEntries.Add(pr);
			}
			EditorGUILayout.EndHorizontal();
		}
		
		EditorGUILayout.BeginHorizontal();
		GUILayout.Space(12);
		GUI.SetNextControlName(parent.name +"_newPrefabName");
		string nameToUse = (string.IsNullOrEmpty(newPrefab.name)) ? unnamedPrefabName : newPrefab.name;
		string chosenPrefabName = EditorGUILayout.TextField(nameToUse);
		GUI.SetNextControlName(parent.name +"_newPrefab");
		GameObject chosenPrefab = (GameObject) EditorGUILayout.ObjectField(newPrefab.prefab, typeof(GameObject), false);
		withFocus = GUI.GetNameOfFocusedControl();
		if (withFocus != parent.name +"_newPrefabName" && chosenPrefab != null) {
			if (chosenPrefabName == unnamedPrefabName || 
				( newPrefab.prefab != null 
				  && chosenPrefab != newPrefab.prefab 
				  && chosenPrefabName.Contains(newPrefab.name)
				)
			) {
				chosenPrefabName = chosenPrefab.name;
			}
		}
		foreach (PrefabRef pr in prefabs) {
			if (pr.name.Contains(chosenPrefabName)) similarNames.Add(pr.name);
		}
		newPrefab.name = Util.MakeUnique(chosenPrefabName, UniqueIndicator, similarNames);
		newPrefab.newName = newPrefab.name;
		similarNames.Clear();
		if (newPrefab.prefab != chosenPrefab) {
			newPrefab.prefab = chosenPrefab;
		}
		if (chosenPrefab == null) {
			GUI.enabled = false;
		} else {
			GUI.enabled = true;
		}
		bool makeNew = GUILayout.Button("+", GUILayout.Width(21));
		GUI.enabled = true;
		if (makeNew) {
			Undo.RegisterUndo(EditorUtility.CollectDeepHierarchy(new Object[] {parent}), "Add Prefab");
			newPrefab.prefab = chosenPrefab;
			prefabList.Add(newPrefab);
			newPrefab = new PrefabRef();
			isDirty = true;
		}
		EditorGUILayout.EndHorizontal();
		if (isDirty) {
			EditorUtility.SetDirty(parent);
		}
	
	}
}