tastudio/lua - add onqueryitembg event to the lua library, this is called during each cell's background color drawing callback, and gives the opportunity for lua to override the color.

BizHawk.Client.Common/lua/LuaLibraryBase.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Drawing;
 using System.Linq;
 
 using LuaInterface;
@@ -63,5 +64,30 @@ namespace BizHawk.Client.Common
 		{
 			return (uint)(double)luaArg;
 		}
+
+		protected static Color? ToColor(object color)
+		{
+			if (color == null)
+			{
+				return null;
+			}
+
+			double tryNum = double.NaN;
+
+			var result = double.TryParse(color.ToString(), out tryNum);
+
+			if (result)
+			{
+				var stringResult = ((int)tryNum).ToString();
+				return ColorTranslator.FromHtml(stringResult);
+			}
+
+			if (!string.IsNullOrWhiteSpace(color.ToString()))
+			{
+				return Color.FromName(color.ToString());
+			}
+
+			return null;
+		}
 	}
 }

BizHawk.Client.EmuHawk/tools/Lua/Libraries/EmuLuaLibrary.Tastudio.cs

@@ -125,5 +125,28 @@ namespace BizHawk.Client.EmuHawk
 
 			return false;
 		}
+
+		[LuaMethodAttributes(
+			"onqueryitembg",
+			"called during the background draw event of the tastudio listview"
+		)]
+		public void OnQueryItemBg(LuaFunction luaf)
+		{
+			if (Engaged())
+			{
+				Tastudio.QueryItemBgColorCallback = (int index, string name) =>
+				{
+					var result = luaf.Call(index, name);
+
+					if (result != null)
+					{
+						var color = ToColor(result[0]);
+						return color;
+					}
+
+					return null;
+				};
+			}
+		}
 	}
 }

BizHawk.Client.EmuHawk/tools/TAStudio/TAStudio.ListView.cs

@@ -95,8 +95,32 @@ namespace BizHawk.Client.EmuHawk
 			}
 		}
 
+		#region Event callbacks
+
+		public Func<int, string, Color?> QueryItemBgColorCallback { get; set; }
+
+		public Color? GetColorOverride(int index, InputRoll.RollColumn column)
+		{
+			if (QueryItemBgColorCallback != null)
+			{
+				return QueryItemBgColorCallback(index, column.Name);
+			}
+
+			return null;
+		}
+
+		#endregion
+
 		private void TasView_QueryItemBkColor(int index, InputRoll.RollColumn column, ref Color color)
 		{
+			var overrideColor = GetColorOverride(index, column);
+
+			if (overrideColor.HasValue)
+			{
+				color = overrideColor.Value;
+				return;
+			}
+
 			string columnName = column.Name;
 
 			if (columnName == MarkerColumnName)