From ec82e6fe687ba1e302ffcf68cb8ea50ddf134407 Mon Sep 17 00:00:00 2001
From: Chris Forbes <chrisf@ijw.co.nz>
Date: Sat, 7 May 2011 11:57:31 +1200
Subject: [PATCH] make ScrollPanelWidget mouse interaction cheaper

---
 OpenRA.Game/Widgets/ScrollPanelWidget.cs | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/OpenRA.Game/Widgets/ScrollPanelWidget.cs b/OpenRA.Game/Widgets/ScrollPanelWidget.cs
index 93d383ece7..a98188c69f 100644
--- a/OpenRA.Game/Widgets/ScrollPanelWidget.cs
+++ b/OpenRA.Game/Widgets/ScrollPanelWidget.cs
@@ -160,11 +160,12 @@ namespace OpenRA.Widgets
 			
 			if (ThumbPressed && mi.Event == MouseInputEvent.Move)
 			{				
-				var ScrollbarHeight = RenderBounds.Height - 2 * ScrollbarWidth;
-				var thumbHeight = ContentHeight == 0 ? 0 : (int)(ScrollbarHeight*Math.Min(RenderBounds.Height*1f/ContentHeight, 1f));
+				var rb = RenderBounds;
+				var ScrollbarHeight = rb.Height - 2 * ScrollbarWidth;
+				var thumbHeight = ContentHeight == 0 ? 0 : (int)(ScrollbarHeight*Math.Min(rb.Height*1f/ContentHeight, 1f));
 				var oldOffset = ListOffset;
-				ListOffset += (int)((lastMouseLocation.Y - mi.Location.Y)*(ContentHeight - RenderBounds.Height)*1f/(ScrollbarHeight - thumbHeight));
-				ListOffset = Math.Min(0,Math.Max(RenderBounds.Height - ContentHeight, ListOffset));
+				ListOffset += (int)((lastMouseLocation.Y - mi.Location.Y)*(ContentHeight - rb.Height)*1f/(ScrollbarHeight - thumbHeight));
+				ListOffset = Math.Min(0,Math.Max(rb.Height - ContentHeight, ListOffset));
 				
 				if (oldOffset != ListOffset)
 					lastMouseLocation = mi.Location;