From fd777e56b3c208be2d0c1faf82e007fe0715ac5c Mon Sep 17 00:00:00 2001
From: Tim Young <tim.young@lightsys.org>
Date: Sat, 17 Mar 2018 12:07:51 -0500
Subject: [PATCH] Get ctrl-y working - redo.

---
 EduNetworkBuilder/NetworkBuilder.cs | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/EduNetworkBuilder/NetworkBuilder.cs b/EduNetworkBuilder/NetworkBuilder.cs
index c2cc105..9aa0696 100644
--- a/EduNetworkBuilder/NetworkBuilder.cs
+++ b/EduNetworkBuilder/NetworkBuilder.cs
@@ -62,6 +62,7 @@ namespace EduNetworkBuilder
 
         private List<HelpURL> HelpURLs = new List<HelpURL>();
         private List<Network> storedNetworkStates = new List<Network>(); //for ctrl-z going back in time to past state
+        private List<Network> ForwardstoredNetworkStates = new List<Network>(); //for ctrl-y going forward to a ctrl-y state
 
         public BuilderWindow(string FirstArg="")
         {
@@ -234,10 +235,20 @@ namespace EduNetworkBuilder
             {
                 if(storedNetworkStates.Count > 0)
                 {
+                    ForwardstoredNetworkStates.Insert(0, myNetwork);//So we can ctrl-y to this state.  Undo the undo
                     ChangeToPastState(storedNetworkStates[0]);
                     storedNetworkStates.RemoveAt(0);
                 }
             }
+            if (e.KeyCode == Keys.Y && e.Modifiers == Keys.Control)
+            {
+                if (ForwardstoredNetworkStates.Count > 0)
+                {
+                    storedNetworkStates.Insert(0, myNetwork);
+                    ChangeToPastState(ForwardstoredNetworkStates[0]);
+                    ForwardstoredNetworkStates.RemoveAt(0);
+                }
+            }
             //MessageBox.Show(e.KeyCode.ToString());
         }
 
@@ -246,6 +257,7 @@ namespace EduNetworkBuilder
             if (storedNetworkStates.Count > 0 && toStore.Equals(storedNetworkStates[0]))
                 return; //The states are identical.  Do not store this state.
             storedNetworkStates.Insert(0,Network.DeepClone(toStore));
+            ForwardstoredNetworkStates.Clear();
             int maxCount = 30;
             if(storedNetworkStates.Count > maxCount)
             {
@@ -259,6 +271,7 @@ namespace EduNetworkBuilder
         public void ClearStoredNetworkStates()
         {
             storedNetworkStates.Clear();
+            ForwardstoredNetworkStates.Clear();
         }
 
         /// <summary>