Add project files.

Assets/Scripts/SimpleAnimationComponent/Editor/SimpleAnimationComponent-Editor.asmdef

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+{
+    "name": "SimpleAnimationComponent-Editor",
+    "references": [
+        "SimpleAnimationComponent"
+    ],
+    "optionalUnityReferences": [],
+    "includePlatforms": [
+        "Editor"
+    ],
+    "excludePlatforms": [],
+    "allowUnsafeCode": false
+}

Assets/Scripts/SimpleAnimationComponent/Editor/SimpleAnimationComponent-Editor.asmdef.meta

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+fileFormatVersion: 2
+guid: 4073e604354115342b874ea3137b12f7
+AssemblyDefinitionImporter:
+  externalObjects: {}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

Assets/Scripts/SimpleAnimationComponent/Editor/SimpleAnimationEditor.cs

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+using UnityEngine;
+using UnityEditor;
+
+[CustomEditor(typeof(SimpleAnimation))]
+public class SimpleAnimationEditor : Editor
+{
+    static class Styles
+    {
+        public static GUIContent animation = new GUIContent("Animation", "The clip that will be played if Play() is called, or if \"Play Automatically\" is enabled");
+        public static GUIContent animations = new GUIContent("Animations", "These clips will define the States the component will start with");
+        public static GUIContent playAutomatically = new GUIContent("Play Automatically", "If checked, the default clip will automatically be played");
+        public static GUIContent animatePhysics = new GUIContent("Animate Physics", "If checked, animations will be updated at the same frequency as Fixed Update");
+
+        public static GUIContent cullingMode = new GUIContent("Culling Mode", "Controls what is updated when the object has been culled");
+    }
+
+    SerializedProperty clip;
+    SerializedProperty states;
+    SerializedProperty playAutomatically;
+    SerializedProperty animatePhysics;
+    SerializedProperty cullingMode;
+
+    void OnEnable()
+    {
+        clip = serializedObject.FindProperty("m_Clip");
+        states = serializedObject.FindProperty("m_States");
+        playAutomatically = serializedObject.FindProperty("m_PlayAutomatically");
+        animatePhysics = serializedObject.FindProperty("m_AnimatePhysics");
+        cullingMode = serializedObject.FindProperty("m_CullingMode");
+    }
+
+    public override void OnInspectorGUI()
+    {
+        serializedObject.Update();
+        EditorGUILayout.PropertyField(clip, Styles.animation);
+        EditorGUILayout.PropertyField(states, Styles.animations, true);
+        EditorGUILayout.PropertyField(playAutomatically, Styles.playAutomatically);
+        EditorGUILayout.PropertyField(animatePhysics, Styles.animatePhysics);
+        EditorGUILayout.PropertyField(cullingMode, Styles.cullingMode);
+
+
+        serializedObject.ApplyModifiedProperties();
+    }
+
+    
+}
+
+[CustomPropertyDrawer(typeof(SimpleAnimation.EditorState))]
+class StateDrawer : PropertyDrawer
+{
+    class Styles
+    {
+        public static readonly GUIContent disabledTooltip = new GUIContent("", "The Default state cannot be edited, change the Animation clip to change the Default State");
+    }
+
+    // Draw the property inside the given rect
+    public override void OnGUI(Rect position, SerializedProperty property, GUIContent label)
+    {
+        // Using BeginProperty / EndProperty on the parent property means that
+        // prefab override logic works on the entire property.
+        EditorGUI.BeginProperty(position, label, property);
+
+        // Draw label
+        position = EditorGUI.PrefixLabel(position, GUIUtility.GetControlID(FocusType.Passive), label);
+
+        // Don't make child fields be indented
+        var indent = EditorGUI.indentLevel;
+        EditorGUI.indentLevel = 0;
+
+        EditorGUILayout.BeginHorizontal();
+        // Calculate rects
+        Rect clipRect = new Rect(position.x, position.y, position.width/2 - 5, position.height);
+        Rect nameRect = new Rect(position.x + position.width/2 + 5, position.y, position.width/2 - 5, position.height);
+
+
+        EditorGUI.BeginDisabledGroup(property.FindPropertyRelative("defaultState").boolValue);
+            EditorGUI.PropertyField(nameRect, property.FindPropertyRelative("clip"), GUIContent.none);
+            EditorGUI.PropertyField(clipRect, property.FindPropertyRelative("name"), GUIContent.none);
+            if (property.FindPropertyRelative("defaultState").boolValue)
+            {
+                EditorGUI.LabelField(position, Styles.disabledTooltip);
+            }
+        
+        EditorGUI.EndDisabledGroup();
+
+        EditorGUILayout.EndHorizontal();
+        // Set indent back to what it was
+        EditorGUI.indentLevel = indent;
+
+        EditorGUI.EndProperty();
+    }
+}

Assets/Scripts/SimpleAnimationComponent/Editor/SimpleAnimationEditor.cs.meta

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+fileFormatVersion: 2
+guid: b42bbe25e28af494dadccf960ecfc32e
+timeCreated: 1502472599
+licenseType: Pro
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: