Fix #2520: The matched pairs are hardly visible in the dark theme

ILSpy/TextView/BracketHighlightRenderer.cs

@@ -81,6 +81,8 @@ namespace ICSharpCode.ILSpy.TextView
 			if (this.result != result)
 			{
 				this.result = result;
+				this.borderPen = (Pen)textView.FindResource(Themes.ResourceKeys.BracketHighlightBorderPen);
+				this.backgroundBrush = (SolidColorBrush)textView.FindResource(Themes.ResourceKeys.BracketHighlightBackgroundBrush);
 				textView.InvalidateLayer(this.Layer);
 			}
 		}
@@ -90,11 +92,8 @@ namespace ICSharpCode.ILSpy.TextView
 			if (textView == null)
 				throw new ArgumentNullException("textView");
 
-			this.borderPen = new Pen(new SolidColorBrush(Color.FromArgb(52, 0, 0, 255)), 1);
+			this.borderPen = (Pen)textView.FindResource(Themes.ResourceKeys.BracketHighlightBorderPen);
-			this.borderPen.Freeze();
+			this.backgroundBrush = (SolidColorBrush)textView.FindResource(Themes.ResourceKeys.BracketHighlightBackgroundBrush);
-
-			this.backgroundBrush = new SolidColorBrush(Color.FromArgb(22, 0, 0, 255));
-			this.backgroundBrush.Freeze();
 
 			this.textView = textView;
 

ILSpy/Themes/DarkTheme.xaml

@@ -29,6 +29,9 @@
 	<Color x:Key="{x:Static SystemColors.InactiveBorderColorKey}">#434346</Color>
 	<Color x:Key="{x:Static SystemColors.InactiveCaptionTextColorKey}">#808080</Color>
 
+	<SolidColorBrush x:Key="{x:Static themes:ResourceKeys.BracketHighlightBackgroundBrush}" Color="#443399FF" />
+	<Pen x:Key="{x:Static themes:ResourceKeys.BracketHighlightBorderPen}" Brush="#883399FF" Thickness="1" />
+
 	<SolidColorBrush x:Key="{x:Static SystemColors.ControlLightLightBrushKey}" Color="#333337" />
 	<SolidColorBrush x:Key="{x:Static SystemColors.ControlLightBrushKey}" Color="#464646" />
 	<SolidColorBrush x:Key="{x:Static SystemColors.ControlBrushKey}" Color="#252526" />

ILSpy/Themes/LightTheme.xaml

@@ -1,6 +1,7 @@
 <ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
-                    xmlns:styles="urn:TomsToolbox.Wpf.Styles">
+                    xmlns:styles="urn:TomsToolbox.Wpf.Styles"
+                    xmlns:themes="clr-namespace:ICSharpCode.ILSpy.Themes">
 	<ResourceDictionary.MergedDictionaries>
 		<ResourceDictionary Source="/AvalonDock.Themes.VS2013;component/lighttheme.xaml" />
 	</ResourceDictionary.MergedDictionaries>
@@ -26,6 +27,9 @@
 	<Color x:Key="{x:Static SystemColors.InactiveBorderColorKey}">#CCCEDB</Color>
 	<Color x:Key="{x:Static SystemColors.InactiveCaptionTextColorKey}">#808080</Color>
 
+	<SolidColorBrush x:Key="{x:Static themes:ResourceKeys.BracketHighlightBackgroundBrush}" Color="#160000FF" />
+	<Pen x:Key="{x:Static themes:ResourceKeys.BracketHighlightBorderPen}" Brush="#340000FF" Thickness="1" />
+
 	<SolidColorBrush x:Key="{x:Static SystemColors.ControlLightLightBrushKey}" Color="#FCFCFC" />
 	<SolidColorBrush x:Key="{x:Static SystemColors.ControlLightBrushKey}" Color="#D8D8E0" />
 	<SolidColorBrush x:Key="{x:Static SystemColors.ControlBrushKey}" Color="#F5F5F5" />

ILSpy/Themes/ResourceKeys.cs

@@ -7,5 +7,7 @@ namespace ICSharpCode.ILSpy.Themes
 		public static ResourceKey TextMarkerBackgroundColor = new ComponentResourceKey(typeof(ResourceKeys), "TextMarkerBackgroundColor");
 		public static ResourceKey TextMarkerDefinitionBackgroundColor = new ComponentResourceKey(typeof(ResourceKeys), "TextMarkerDefinitionBackgroundColor");
 		public static ResourceKey LinkTextForegroundBrush = new ComponentResourceKey(typeof(ResourceKeys), "LinkTextForegroundBrush");
+		public static ResourceKey BracketHighlightBackgroundBrush = new ComponentResourceKey(typeof(ResourceKeys), "BracketHighlightBackgroundBrush");
+		public static ResourceKey BracketHighlightBorderPen = new ComponentResourceKey(typeof(ResourceKeys), "BracketHighlightBorderPen");
 	}
 }