From 986adf1754f7dbd08821e69236792bbdea9e6f39 Mon Sep 17 00:00:00 2001
From: Daniel Grunwald <daniel@danielgrunwald.de>
Date: Mon, 9 Mar 2009 20:18:54 +0000
Subject: [PATCH] Fixed two bugs introduced by Layers.

git-svn-id: svn://svn.sharpdevelop.net/sharpdevelop/trunk@3844 1ccf3a8d-04fe-1044-b7c0-cef0b8235c61
---
 .../ICSharpCode.AvalonEdit/Gui/CaretLayer.cs  |  2 ++
 .../ICSharpCode.AvalonEdit/Gui/Layer.cs       |  2 --
 .../Gui/SelectionLayer.cs                     |  7 ++++++-
 .../ICSharpCode.AvalonEdit/Gui/TextView.cs    |  1 +
 .../Gui/TextViewWeakEventManager.cs           | 19 +++++++++++++++++++
 5 files changed, 28 insertions(+), 3 deletions(-)

diff --git a/src/Libraries/AvalonEdit/ICSharpCode.AvalonEdit/Gui/CaretLayer.cs b/src/Libraries/AvalonEdit/ICSharpCode.AvalonEdit/Gui/CaretLayer.cs
index eb8a699be6..2417824559 100644
--- a/src/Libraries/AvalonEdit/ICSharpCode.AvalonEdit/Gui/CaretLayer.cs
+++ b/src/Libraries/AvalonEdit/ICSharpCode.AvalonEdit/Gui/CaretLayer.cs
@@ -23,6 +23,8 @@ namespace ICSharpCode.AvalonEdit.Gui
 		
 		public CaretLayer(TextView textView) : base(textView, KnownLayer.Caret)
 		{
+			this.IsHitTestVisible = false;
+			
 			blinkAnimation = new DoubleAnimationUsingKeyFrames();
 			blinkAnimation.KeyFrames.Add(new DiscreteDoubleKeyFrame(1, KeyTime.FromPercent(0)));
 			blinkAnimation.KeyFrames.Add(new DiscreteDoubleKeyFrame(0, KeyTime.FromPercent(0.5)));
diff --git a/src/Libraries/AvalonEdit/ICSharpCode.AvalonEdit/Gui/Layer.cs b/src/Libraries/AvalonEdit/ICSharpCode.AvalonEdit/Gui/Layer.cs
index 2d493e978d..9896cb3db0 100644
--- a/src/Libraries/AvalonEdit/ICSharpCode.AvalonEdit/Gui/Layer.cs
+++ b/src/Libraries/AvalonEdit/ICSharpCode.AvalonEdit/Gui/Layer.cs
@@ -25,8 +25,6 @@ namespace ICSharpCode.AvalonEdit.Gui
 			Debug.Assert(textView != null);
 			this.textView = textView;
 			this.knownLayer = knownLayer;
-			
-			this.IsHitTestVisible = false;
 		}
 		
 		protected override GeometryHitTestResult HitTestCore(GeometryHitTestParameters hitTestParameters)
diff --git a/src/Libraries/AvalonEdit/ICSharpCode.AvalonEdit/Gui/SelectionLayer.cs b/src/Libraries/AvalonEdit/ICSharpCode.AvalonEdit/Gui/SelectionLayer.cs
index 9f65102c69..e9ac6a89b0 100644
--- a/src/Libraries/AvalonEdit/ICSharpCode.AvalonEdit/Gui/SelectionLayer.cs
+++ b/src/Libraries/AvalonEdit/ICSharpCode.AvalonEdit/Gui/SelectionLayer.cs
@@ -17,13 +17,18 @@ namespace ICSharpCode.AvalonEdit.Gui
 		
 		public SelectionLayer(TextArea textArea) : base(textArea.TextView, KnownLayer.Selection)
 		{
+			this.IsHitTestVisible = false;
+			
 			this.textArea = textArea;
 			TextViewWeakEventManager.VisualLinesChanged.AddListener(textView, this);
+			TextViewWeakEventManager.ScrollOffsetChanged.AddListener(textView, this);
 		}
 		
 		public bool ReceiveWeakEvent(Type managerType, object sender, EventArgs e)
 		{
-			if (managerType == typeof(TextViewWeakEventManager.VisualLinesChanged)) {
+			if (managerType == typeof(TextViewWeakEventManager.VisualLinesChanged)
+			    || managerType == typeof(TextViewWeakEventManager.ScrollOffsetChanged))
+			{
 				InvalidateVisual();
 				return true;
 			}
diff --git a/src/Libraries/AvalonEdit/ICSharpCode.AvalonEdit/Gui/TextView.cs b/src/Libraries/AvalonEdit/ICSharpCode.AvalonEdit/Gui/TextView.cs
index ce1f7da8ce..427f1f8d55 100644
--- a/src/Libraries/AvalonEdit/ICSharpCode.AvalonEdit/Gui/TextView.cs
+++ b/src/Libraries/AvalonEdit/ICSharpCode.AvalonEdit/Gui/TextView.cs
@@ -935,6 +935,7 @@ namespace ICSharpCode.AvalonEdit.Gui
 			if (!scrollOffset.X.IsClose(offset)) {
 				SetScrollOffset(new Vector(offset, scrollOffset.Y));
 				InvalidateVisual();
+				textLayer.InvalidateVisual();
 			}
 		}
 		
diff --git a/src/Libraries/AvalonEdit/ICSharpCode.AvalonEdit/Gui/TextViewWeakEventManager.cs b/src/Libraries/AvalonEdit/ICSharpCode.AvalonEdit/Gui/TextViewWeakEventManager.cs
index 62128c5eee..40920c69bd 100644
--- a/src/Libraries/AvalonEdit/ICSharpCode.AvalonEdit/Gui/TextViewWeakEventManager.cs
+++ b/src/Libraries/AvalonEdit/ICSharpCode.AvalonEdit/Gui/TextViewWeakEventManager.cs
@@ -52,5 +52,24 @@ namespace ICSharpCode.AvalonEdit.Gui
 				source.VisualLinesChanged -= DeliverEvent;
 			}
 		}
+		
+		/// <summary>
+		/// Weak event manager for the <see cref="TextView.ScrollOffsetChanged"/> event.
+		/// </summary>
+		[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1034:NestedTypesShouldNotBeVisible")]
+		public sealed class ScrollOffsetChanged : WeakEventManagerBase<ScrollOffsetChanged, TextView>
+		{
+			/// <inheritdoc/>
+			protected override void StartListening(TextView source)
+			{
+				source.ScrollOffsetChanged += DeliverEvent;
+			}
+			
+			/// <inheritdoc/>
+			protected override void StopListening(TextView source)
+			{
+				source.ScrollOffsetChanged -= DeliverEvent;
+			}
+		}
 	}
 }