Added support for full row coloring

Terminal.Gui/Views/TableView.cs

@@ -384,13 +384,15 @@ namespace Terminal.Gui {
 		}
 		private void RenderRow(int row, int rowToRender, ColumnToRender[] columnsToRender)
 		{
+			var rowScheme = (Style.RowColorGetter?.Invoke(rowToRender,Table.Rows[rowToRender])) ?? ColorScheme;
+
 			//render start of line
 			if(style.ShowVerticalCellLines)
 				AddRune(0,row,Driver.VLine);
 
 			//start by clearing the entire line
 			Move (0,row);
-			Driver.SetAttribute (FullRowSelect &&  IsSelected(0,rowToRender) ? ColorScheme.HotFocus : ColorScheme.Normal);
+			Driver.SetAttribute (FullRowSelect &&  IsSelected(0,rowToRender) ? rowScheme.HotFocus : rowScheme.Normal);
 			Driver.AddStr (new string(' ',Bounds.Width));
 
 			// Render cells for each visible header for the current row
@@ -410,20 +412,20 @@ namespace Terminal.Gui {
 
 				// Render the (possibly truncated) cell value
 				var representation = GetRepresentation(val,colStyle);
-				var scheme = (colStyle?.ColorGetter?.Invoke(val)) ?? ColorScheme;
+				var scheme = (colStyle?.ColorGetter?.Invoke(rowToRender,val)) ?? rowScheme;
 
 				Driver.SetAttribute (isSelectedCell ? scheme.HotFocus : scheme.Normal);
 				
 				Driver.AddStr (TruncateOrPad(val,representation, current.Width, colStyle));
 
 				// Reset color scheme to normal for drawing separators if we drew text with custom scheme
-				if(scheme != ColorScheme) {
-					Driver.SetAttribute (isSelectedCell ? ColorScheme.HotFocus : ColorScheme.Normal);
+				if(scheme != rowScheme) {
+					Driver.SetAttribute (isSelectedCell ? rowScheme.HotFocus : rowScheme.Normal);
 				}
 
 				// If not in full row select mode always, reset color scheme to normal and render the vertical line (or space) at the end of the cell
 				if (!FullRowSelect)
-					Driver.SetAttribute (ColorScheme.Normal);
+					Driver.SetAttribute (rowScheme.Normal);
 
 				RenderSeparator(current.X-1,row,false);
 
@@ -1115,6 +1117,14 @@ namespace Terminal.Gui {
 			return colStyle != null ? colStyle.GetRepresentation(value): value.ToString();
 		}
 
+		/// <summary>
+		/// Delegate for providing color to <see cref="TableView"/> cells based on the value being rendered
+		/// </summary>
+		/// <param name="rowIdx">The row index of <see cref="DataTable.Rows"/> collection being rendered</param>
+		/// <param name="value">The full value in the table being rendered in this cell</param>
+		/// <returns></returns>
+		public delegate ColorScheme CellColorGetterDelegate(int rowIdx, object value);
+
 
 		#region Nested Types
 		/// <summary>
@@ -1144,7 +1154,7 @@ namespace Terminal.Gui {
 			/// Defines a delegate for returning a custom color scheme per cell based on cell values.
 			/// Return null for the default
 			/// </summary>
-			public Func<object, ColorScheme> ColorGetter;
+			public CellColorGetterDelegate ColorGetter;
 
 			/// <summary>
 			/// Defines the format for values e.g. "yyyy-MM-dd" for dates
@@ -1231,6 +1241,11 @@ namespace Terminal.Gui {
 			/// </summary>
 			public Dictionary<DataColumn, ColumnStyle> ColumnStyles { get; set; } = new Dictionary<DataColumn, ColumnStyle> ();
 
+			/// <summary>
+			/// Delegate for coloring specific rows in a different color.  For cell color <see cref="ColumnStyle.ColorGetter"/>
+			/// </summary>
+			/// <value></value>
+			public Func<int,DataRow,ColorScheme> RowColorGetter {get;set;}
 
 			/// <summary>
 			/// Determines rendering when the last column in the table is visible but it's

UICatalog/Scenarios/TableEditor.cs

@@ -23,8 +23,11 @@ namespace UICatalog.Scenarios {
 		private MenuItem miCellLines;
 		private MenuItem miFullRowSelect;
 		private MenuItem miExpandLastColumn;
+		private MenuItem miAlternatingColors;
 
 		ColorScheme redColorScheme;
+		ColorScheme redColorSchemeAlt;
+		ColorScheme alternatingColorScheme;
 
 		public override void Setup ()
 		{
@@ -57,6 +60,7 @@ namespace UICatalog.Scenarios {
 					miExpandLastColumn = new MenuItem ("_ExpandLastColumn", "", () => ToggleExpandLastColumn()){Checked = tableView.Style.ExpandLastColumn, CheckType = MenuItemCheckStyle.Checked },
 					new MenuItem ("_AllLines", "", () => ToggleAllCellLines()),
 					new MenuItem ("_NoLines", "", () => ToggleNoCellLines()),
+					miAlternatingColors = new MenuItem ("Alternating Colors", "", () => ToggleAlternatingColors()){CheckType = MenuItemCheckStyle.Checked},
 					new MenuItem ("_ClearColumnStyles", "", () => ClearColumnStyles()),
 				}),
 			});
@@ -95,6 +99,21 @@ namespace UICatalog.Scenarios {
 				Focus = Colors.Base.Focus,
 				Normal = Application.Driver.MakeAttribute(Color.Red,Color.Blue)
 			};
+
+			alternatingColorScheme = new ColorScheme(){
+
+				Disabled = Colors.Base.Disabled,
+				HotFocus = Colors.Base.HotFocus,
+				Focus = Colors.Base.Focus,
+				Normal = Application.Driver.MakeAttribute(Color.White,Color.BrightBlue)
+			};
+			redColorSchemeAlt = new ColorScheme(){
+
+				Disabled = Colors.Base.Disabled,
+				HotFocus = Colors.Base.HotFocus,
+				Focus = Colors.Base.Focus,
+				Normal = Application.Driver.MakeAttribute(Color.Red,Color.BrightBlue)
+			};
 		}
 
 		private void SetupScrollBar ()
@@ -233,6 +252,21 @@ namespace UICatalog.Scenarios {
 
 			tableView.Update();
 		}
+
+		private void ToggleAlternatingColors()
+		{
+			//toggle menu item
+			miAlternatingColors.Checked = !miAlternatingColors.Checked;
+
+			if(miAlternatingColors.Checked){
+				tableView.Style.RowColorGetter = (i,r)=> {return i%2==0 ? alternatingColorScheme : null;};
+			}
+			else
+			{
+				tableView.Style.RowColorGetter = null;
+			}
+			tableView.SetNeedsDisplay();
+		}
 		
 
 		private void CloseExample ()
@@ -277,9 +311,9 @@ namespace UICatalog.Scenarios {
 								// not a double
 								TextAlignment.Left,
 				
-				ColorGetter = (v)=>v is double d ? 
+				ColorGetter = (i,v)=>v is double d ? 
 								// color 0 and negative values red
-								d <= 0.0000001 ? redColorScheme : 
+								d <= 0.0000001 ? i%2==0 && miAlternatingColors.Checked ? redColorSchemeAlt: redColorScheme : 
 								// use normal scheme for positive values
 								null:
 								// not a double