From a4f24af5a8b2ebd43d2e8fb3dd43300e9280dc32 Mon Sep 17 00:00:00 2001
From: Matt Moening <matt.moening@matterhackers.com>
Date: Mon, 16 Nov 2015 12:27:31 -0800
Subject: [PATCH] Implemented scrolling in the terminal widget

---
 .../TerminalWindow/TextScrollWidget.cs        | 31 ++++++++++++++++++-
 1 file changed, 30 insertions(+), 1 deletion(-)

diff --git a/PrinterControls/TerminalWindow/TextScrollWidget.cs b/PrinterControls/TerminalWindow/TextScrollWidget.cs
index 824095d2b..7fba1113b 100644
--- a/PrinterControls/TerminalWindow/TextScrollWidget.cs
+++ b/PrinterControls/TerminalWindow/TextScrollWidget.cs
@@ -227,5 +227,34 @@ namespace MatterHackers.MatterControl
 
 			base.OnDraw(graphics2D);
 		}
-	}
+
+        public override void OnMouseWheel(MouseEventArgs mouseEvent)
+        {
+            base.OnMouseWheel(mouseEvent);
+            double scrollDelta = (mouseEvent.WheelDelta / ((visibleLines.Count) * 60.0));
+
+            if (scrollDelta < 0)//Rounding seems to favor scrolling up, compinsating scroll down to feel as smooth
+            {
+                scrollDelta *= 2;
+            }
+            else if (Position0To1 == 0)//IF we scroll up at the bottum get pop out from the "on screen" chunck
+            {
+                scrollDelta = (NumVisibleLines/(double)visibleLines.Count);
+            }
+
+            double newPos = Position0To1 + scrollDelta;
+            
+            if(newPos > 1)
+            {
+                newPos = 1;
+            }
+            else if(newPos < 0)
+            {
+                newPos = 0;
+            }
+
+            Position0To1 = newPos;
+        }
+
+    }
 }
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