SD-1592: color of line numbers is now customisable

src/AddIns/DisplayBindings/AvalonEdit.AddIn/Src/CustomizableHighlightingColorizer.cs

@@ -6,8 +6,8 @@ using System.Collections.Generic;
 using System.Diagnostics;
 using System.Linq;
 using System.Windows;
+using System.Windows.Controls;
 using System.Windows.Media;
-
 using ICSharpCode.AvalonEdit.Document;
 using ICSharpCode.AvalonEdit.Editing;
 using ICSharpCode.AvalonEdit.Highlighting;
@@ -23,18 +23,22 @@ namespace ICSharpCode.AvalonEdit.AddIn
 		public const string DefaultTextAndBackground = "Default text/background";
 		public const string SelectedText = "Selected text";
 		public const string NonPrintableCharacters = "Non-printable characters";
+		public const string LineNumbers = "Line numbers";
 		
 		public static void ApplyCustomizationsToDefaultElements(TextEditor textEditor, IEnumerable<CustomizedHighlightingColor> customizations)
 		{
 			textEditor.ClearValue(TextEditor.BackgroundProperty);
 			textEditor.ClearValue(TextEditor.ForegroundProperty);
+			textEditor.ClearValue(TextEditor.LineNumbersForegroundProperty);
 			textEditor.TextArea.ClearValue(TextArea.SelectionBorderProperty);
 			textEditor.TextArea.ClearValue(TextArea.SelectionBrushProperty);
 			textEditor.TextArea.ClearValue(TextArea.SelectionForegroundProperty);
 			textEditor.TextArea.TextView.ClearValue(TextView.NonPrintableCharacterBrushProperty);
+			
 			bool assignedDefaultText = false;
 			bool assignedSelectedText = false;
 			bool assignedNonPrintableCharacter = false;
+			bool assignedLineNumbers = false;
 			foreach (CustomizedHighlightingColor color in customizations) {
 				switch (color.Name) {
 					case DefaultTextAndBackground:
@@ -73,6 +77,14 @@ namespace ICSharpCode.AvalonEdit.AddIn
 						if (color.Foreground != null)
 							textEditor.TextArea.TextView.NonPrintableCharacterBrush = CreateFrozenBrush(color.Foreground.Value);
 						break;
+					case LineNumbers:
+						if (assignedLineNumbers)
+							continue;
+						assignedLineNumbers = true;
+						
+						if (color.Foreground != null)
+							textEditor.LineNumbersForeground = CreateFrozenBrush(color.Foreground.Value);
+						break;
 				}
 			}
 		}

src/AddIns/DisplayBindings/AvalonEdit.AddIn/Src/Options/HighlightingOptions.xaml.cs

@@ -154,6 +154,24 @@ namespace ICSharpCode.AvalonEdit.AddIn.Options
 			nonPrintChars.PropertyChanged += item_PropertyChanged;
 			listBox.Items.Add(nonPrintChars);
 			
+			// Create entry for "Line numbers"
+			IHighlightingItem lineNumbers = new SimpleHighlightingItem(
+				CustomizableHighlightingColorizer.LineNumbers,
+				ta => {
+					ta.Document.Text = "These are just" + Environment.NewLine +
+						"multiple" + Environment.NewLine +
+						"lines of" + Environment.NewLine +
+						"text";
+				})
+			{
+				Foreground = Colors.Gray
+			};
+			lineNumbers = new CustomizedHighlightingItem(customizationList, lineNumbers, null, canSetFont: false, canSetBackground: false);
+			if (language != null)
+				lineNumbers = new CustomizedHighlightingItem(customizationList, lineNumbers, language, canSetFont: false);
+			lineNumbers.PropertyChanged += item_PropertyChanged;
+			listBox.Items.Add(lineNumbers);
+			
 			// Create entry for "Bracket highlight"
 			IHighlightingItem bracketHighlight = new SimpleHighlightingItem(
 				BracketHighlightRenderer.BracketHighlight,

src/Libraries/AvalonEdit/ICSharpCode.AvalonEdit/Rendering/TextView.cs

@@ -367,10 +367,16 @@ namespace ICSharpCode.AvalonEdit.Rendering
 		#endregion
 		
 		#region Brushes
+		/// <summary>
+		/// NonPrintableCharacterBrush dependency property.
+		/// </summary>
 		public static readonly DependencyProperty NonPrintableCharacterBrushProperty =
 			DependencyProperty.Register("NonPrintableCharacterBrush", typeof(Brush), typeof(TextView),
 			                            new FrameworkPropertyMetadata(Brushes.LightGray));
 		
+		/// <summary>
+		/// Gets/sets the Brush used for displaying non-printable characters.
+		/// </summary>
 		public Brush NonPrintableCharacterBrush {
 			get { return (Brush)GetValue(NonPrintableCharacterBrushProperty); }
 			set { SetValue(NonPrintableCharacterBrushProperty, value); }

src/Libraries/AvalonEdit/ICSharpCode.AvalonEdit/TextEditor.cs

@@ -4,6 +4,7 @@
 using System;
 using System.ComponentModel;
 using System.IO;
+using System.Linq;
 using System.Text;
 using System.Windows;
 using System.Windows.Controls;
@@ -11,6 +12,7 @@ using System.Windows.Controls.Primitives;
 using System.Windows.Data;
 using System.Windows.Input;
 using System.Windows.Markup;
+using System.Windows.Media;
 using System.Windows.Threading;
 using ICSharpCode.AvalonEdit.Document;
 using ICSharpCode.AvalonEdit.Editing;
@@ -449,7 +451,7 @@ namespace ICSharpCode.AvalonEdit
 		
 		#region ShowLineNumbers
 		/// <summary>
-		/// IsReadOnly dependency property.
+		/// ShowLineNumbers dependency property.
 		/// </summary>
 		public static readonly DependencyProperty ShowLineNumbersProperty =
 			DependencyProperty.Register("ShowLineNumbers", typeof(bool), typeof(TextEditor),
@@ -470,6 +472,7 @@ namespace ICSharpCode.AvalonEdit
 			if ((bool)e.NewValue) {
 				leftMargins.Insert(0, new LineNumberMargin());
 				leftMargins.Insert(1, DottedLineMargin.Create());
+				leftMargins[0].SetValue(Control.ForegroundProperty, editor.LineNumbersForeground);
 			} else {
 				for (int i = 0; i < leftMargins.Count; i++) {
 					if (leftMargins[i] is LineNumberMargin) {
@@ -484,6 +487,33 @@ namespace ICSharpCode.AvalonEdit
 		}
 		#endregion
 		
+		#region LineNumbersForeground
+		/// <summary>
+		/// LineNumbersForeground dependency property.
+		/// </summary>
+		public static readonly DependencyProperty LineNumbersForegroundProperty =
+			DependencyProperty.Register("LineNumbersForeground", typeof(Brush), typeof(TextEditor),
+			                            new FrameworkPropertyMetadata(Brushes.Gray, OnLineNumbersForegroundChanged));
+		
+		/// <summary>
+		/// Gets/sets the Brush used for displaying the foreground color of line numbers.
+		/// </summary>
+		public Brush LineNumbersForeground {
+			get { return (Brush)GetValue(LineNumbersForegroundProperty); }
+			set { SetValue(LineNumbersForegroundProperty, value); }
+		}
+		
+		static void OnLineNumbersForegroundChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
+		{
+			TextEditor editor = (TextEditor)d;
+			var lineNumberMargin = editor.TextArea.LeftMargins.FirstOrDefault(margin => margin is LineNumberMargin) as LineNumberMargin;;
+			
+			if (lineNumberMargin != null) {
+				lineNumberMargin.SetValue(Control.ForegroundProperty, e.NewValue);
+			}
+		}
+		#endregion
+		
 		#region TextBoxBase-like methods
 		/// <summary>
 		/// Appends text to the end of the document.

src/Libraries/AvalonEdit/ICSharpCode.AvalonEdit/themes/generic.xaml

@@ -9,7 +9,6 @@
 	</ResourceDictionary.MergedDictionaries>
 	
 	<Style TargetType="{x:Type editing:LineNumberMargin}">
-		<Setter Property="TextBlock.Foreground" Value="Gray"/>
 		<Setter Property="Control.Cursor" Value="/ICSharpCode.AvalonEdit;component/themes/RightArrow.cur"/>
 	</Style>
 </ResourceDictionary>