Change variable in inspector depending on enum using struct

First of all, my english is bad. sorry :(

This is what I want to serialize in inspector.

 public class TouchGameInfo : MonoBehaviour {
    public InfoPerGame[] hi;
}
[System.Serializable]
public struct GameInfo
{
    public TouchGameType TouchType;
    public int Count;
    public float Seconds;
    public EasyTouch.SwipeDirection Direction;
}
[System.Serializable]
public struct InfoPerGame
{
    public int GameNumber;
    public float Timer;
    public GameInfo[] Info;
}

And this is my editor script

 [CustomEditor(typeof(GameInfo)) , CanEditMultipleObjects]
public class InspectorTest :  Editor {
    public SerializedProperty
        type_Prop,
        count_Prop,
        seconds_Prop,
        direction_Prop;
    void OnEnable()
    {
        type_Prop = serializedObject.FindProperty("TouchType");
        count_Prop = serializedObject.FindProperty("Count");
        seconds_Prop = serializedObject.FindProperty("Seconds");
        direction_Prop = serializedObject.FindProperty("Direction");
    }
    public override void OnInspectorGUI()
    {
        serializedObject.Update();
        EditorGUILayout.PropertyField(type_Prop);
        TouchGameType pdpd = (TouchGameType)type_Prop.enumValueIndex;
        switch(pdpd)
        {
            case TouchGameType.Tap :
                EditorGUILayout.PropertyField(count_Prop, new GUIContent("Count"));
                break;
            case TouchGameType.Hold :
                EditorGUILayout.PropertyField(seconds_Prop, new GUIContent("Seconds"));
                break;
            case TouchGameType.Swipe :
                EditorGUILayout.PropertyField(direction_Prop, new GUIContent("Direction"));
                break;
        }
        serializedObject.ApplyModifiedProperties();
    }
}

I want variables( Count, Seconds, Direction in GameInfo) are show just only one of them depends on TouchType in GameInfo.

But somehow, I dunno why (maybe [System.Serializable]?), It shows all of my property in inspector.

The thing that I want to do is possible in Unity 5.4 ?

inspector in my dream be like :

• Hi

     *Size : 1
       *Element 0
           *Game Number : 1
           *Timer : 2.5
           *Info
               *Size : 1
               *Element 0
                   *Touch Type : Hold
                   *Seconds : 1.5
  
  

like this .... help plz