Clear selection and caret position when TextArea.Document is changed.

git-svn-id: svn://svn.sharpdevelop.net/sharpdevelop/trunk@5254 1ccf3a8d-04fe-1044-b7c0-cef0b8235c61

src/Libraries/AvalonEdit/ICSharpCode.AvalonEdit.Tests/Editing/ChangeDocumentTests.cs

@@ -0,0 +1,65 @@
+// <file>
+//     <copyright see="prj:///doc/copyright.txt"/>
+//     <license see="prj:///doc/license.txt"/>
+//     <owner name="Daniel Grunwald"/>
+//     <version>$Revision$</version>
+// </file>
+
+
+using System;
+using System.Text;
+using ICSharpCode.AvalonEdit.Document;
+using NUnit.Framework;
+
+namespace ICSharpCode.AvalonEdit.Editing
+{
+	[TestFixture]
+	public class ChangeDocumentTests
+	{
+		[Test]
+		public void ClearCaretAndSelectionOnDocumentChange()
+		{
+			TextArea textArea = new TextArea();
+			textArea.Document = new TextDocument("1\n2\n3\n4th line");
+			textArea.Caret.Offset = 6;
+			textArea.Selection = new SimpleSelection(3, 6);
+			textArea.Document = new TextDocument("1\n2nd");
+			Assert.AreEqual(0, textArea.Caret.Offset);
+			Assert.AreEqual(new TextLocation(1, 1), textArea.Caret.Location);
+			Assert.AreSame(Selection.Empty, textArea.Selection);
+		}
+		
+		[Test]
+		public void SetDocumentToNull()
+		{
+			TextArea textArea = new TextArea();
+			textArea.Document = new TextDocument("1\n2\n3\n4th line");
+			textArea.Caret.Offset = 6;
+			textArea.Selection = new SimpleSelection(3, 6);
+			textArea.Document = null;
+			Assert.AreEqual(0, textArea.Caret.Offset);
+			Assert.AreEqual(new TextLocation(1, 1), textArea.Caret.Location);
+			Assert.AreSame(Selection.Empty, textArea.Selection);
+		}
+		
+		[Test]
+		public void CheckEventOrderOnDocumentChange()
+		{
+			TextArea textArea = new TextArea();
+			TextDocument newDocument = new TextDocument();
+			StringBuilder b = new StringBuilder();
+			textArea.TextView.DocumentChanged += delegate {
+				b.Append("TextView.DocumentChanged;");
+				Assert.AreSame(newDocument, textArea.TextView.Document);
+				Assert.AreSame(newDocument, textArea.Document);
+			};
+			textArea.DocumentChanged += delegate {
+				b.Append("TextArea.DocumentChanged;");
+				Assert.AreSame(newDocument, textArea.TextView.Document);
+				Assert.AreSame(newDocument, textArea.Document);
+			};
+			textArea.Document = newDocument;
+			Assert.AreEqual("TextView.DocumentChanged;TextArea.DocumentChanged;", b.ToString());
+		}
+	}
+}

src/Libraries/AvalonEdit/ICSharpCode.AvalonEdit.Tests/ICSharpCode.AvalonEdit.Tests.csproj

@@ -1,10 +1,11 @@
-<Project ToolsVersion="4.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="4.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <PropertyGroup>
     <ProjectGuid>{6222A3A1-83CE-47A3-A4E4-A018F82D44D8}</ProjectGuid>
     <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
     <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
     <OutputType>Library</OutputType>
-    <RootNamespace>ICSharpCode.AvalonEdit.Tests</RootNamespace>
+    <RootNamespace>ICSharpCode.AvalonEdit</RootNamespace>
     <AssemblyName>ICSharpCode.AvalonEdit.Tests</AssemblyName>
     <TargetFrameworkVersion>v3.5</TargetFrameworkVersion>
     <AppDesignerFolder>Properties</AppDesignerFolder>
@@ -72,6 +73,7 @@
     <Compile Include="Document\TextAnchorTest.cs" />
     <Compile Include="Document\TextSegmentTreeTest.cs" />
     <Compile Include="Document\TextUtilitiesTests.cs" />
+    <Compile Include="Editing\ChangeDocumentTests.cs" />
     <Compile Include="Editing\TextSegmentReadOnlySectionTests.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
     <Compile Include="Document\CollapsingTests.cs" />

src/Libraries/AvalonEdit/ICSharpCode.AvalonEdit/Editing/TextArea.cs

@@ -205,6 +205,10 @@ namespace ICSharpCode.AvalonEdit.Editing
 				TextDocumentWeakEventManager.UpdateStarted.AddListener(newValue, this);
 				TextDocumentWeakEventManager.UpdateFinished.AddListener(newValue, this);
 			}
+			// Reset caret location and selection: this is necessary because the caret/selection might be invalid
+			// in the new document (e.g. if new document is shorter than the old document).
+			caret.Location = new TextLocation(1, 1);
+			this.Selection = Selection.Empty;
 			if (DocumentChanged != null)
 				DocumentChanged(this, EventArgs.Empty);
 			CommandManager.InvalidateRequerySuggested();