Made color methods in TextView protected virtual

Terminal.Gui/Views/TextView.cs

@@ -1333,17 +1333,46 @@ namespace Terminal.Gui {
 			}
 		}
 
-		void ColorNormal ()
+		/// <summary>
+		/// Sets the driver to the default color for the control where no text is being rendered.  Defaults to <see cref="ColorScheme.Normal"/>.
+		/// </summary>
+		protected virtual void ColorNormal ()
 		{
 			Driver.SetAttribute (ColorScheme.Normal);
 		}
 
-		void ColorSelection ()
+		/// <summary>
+		/// Sets the <see cref="View.Driver"/> to an appropriate color for rendering the given <paramref name="idx"/> of the
+		/// current <paramref name="line"/>.  Override to provide custom coloring by calling <see cref="ConsoleDriver.SetAttribute(Attribute)"/>
+		/// Defaults to <see cref="ColorScheme.Normal"/>.
+		/// </summary>
+		/// <param name="line"></param>
+		/// <param name="idx"></param>
+		protected virtual void ColorNormal (List<Rune> line, int idx)
+		{
+			Driver.SetAttribute (ColorScheme.Normal);
+		}
+
+		/// <summary>
+		/// Sets the <see cref="View.Driver"/> to an appropriate color for rendering the given <paramref name="idx"/> of the
+		/// current <paramref name="line"/>.  Override to provide custom coloring by calling <see cref="ConsoleDriver.SetAttribute(Attribute)"/>
+		/// Defaults to <see cref="ColorScheme.Focus"/>.
+		/// </summary>
+		/// <param name="line"></param>
+		/// <param name="idx"></param>
+		protected virtual void ColorSelection (List<Rune> line, int idx)
 		{
 			Driver.SetAttribute (ColorScheme.Focus);
 		}
 
-		void ColorUsed ()
+		/// <summary>
+		/// Sets the <see cref="View.Driver"/> to an appropriate color for rendering the given <paramref name="idx"/> of the
+		/// current <paramref name="line"/>.  Override to provide custom coloring by calling <see cref="ConsoleDriver.SetAttribute(Attribute)"/>
+		/// Defaults to <see cref="ColorScheme.HotFocus"/>.
+		/// </summary>
+		/// <param name="line"></param>
+		/// <param name="idx"></param>
+		protected virtual void ColorUsed (List<Rune> line, int idx)
 		{
 			Driver.SetAttribute (ColorScheme.HotFocus);
 		}
@@ -1667,12 +1696,12 @@ namespace Terminal.Gui {
 					var rune = idxCol >= lineRuneCount ? ' ' : line [idxCol];
 					var cols = Rune.ColumnWidth (rune);
 					if (idxCol < line.Count && selecting && PointInSelection (idxCol, idxRow)) {
-						ColorSelection ();
+						ColorSelection (line, idxCol);
 					} else if (idxCol == currentColumn && idxRow == currentRow && !selecting && !Used
 						&& HasFocus && idxCol < lineRuneCount) {
-						ColorUsed ();
+						ColorUsed (line, idxCol);
 					} else {
-						ColorNormal ();
+						ColorNormal (line,idxCol);
 					}
 
 					if (rune == '\t' && TabWidth > 0) {

UICatalog/Scenarios/SyntaxHighlighting.cs

@@ -0,0 +1,66 @@
+
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using Terminal.Gui;
+using static UICatalog.Scenario;
+
+
+namespace UICatalog.Scenarios {
+	[ScenarioMetadata (Name: "Syntax Highlighting", Description: "Text editor with keyword highlighting")]
+	[ScenarioCategory ("Controls")]
+	class SyntaxHighlighting : Scenario {
+
+			public override void Setup ()
+			{
+				Win.Title = this.GetName ();
+				Win.Y = 1; // menu
+				Win.Height = Dim.Fill (1); // status bar
+				Top.LayoutSubviews ();
+
+				var menu = new MenuBar (new MenuBarItem [] {
+				new MenuBarItem ("_File", new MenuItem [] {
+					new MenuItem ("_Quit", "", () => Quit()),
+				})
+				});
+				Top.Add (menu);
+
+				var textView = new SqlTextView () {
+					X = 0,
+					Y = 0,
+					Width = Dim.Fill (),
+					Height = Dim.Fill (1),
+				};
+
+
+				Win.Add (textView);
+
+				var statusBar = new StatusBar (new StatusItem [] {
+				new StatusItem(Key.CtrlMask | Key.Q, "~^Q~ Quit", () => Quit()),
+
+			});
+
+
+				Top.Add (statusBar);
+			}
+
+
+			private void Quit ()
+			{
+				Application.RequestStop ();
+			}
+
+		private class SqlTextView : TextView{
+
+
+
+			protected override void ColorNormal (List<System.Rune> line, int idx)
+			{
+				Driver.SetAttribute (Driver.MakeAttribute (Color.Green, Color.Black));				
+			}
+		}
+	}
+}