From b7263a90a96014def6e634e98c6b3e4eed7f5267 Mon Sep 17 00:00:00 2001
From: Siegfried Pammer <siegfriedpammer@gmail.com>
Date: Wed, 1 Sep 2010 18:00:02 +0200
Subject: [PATCH] - created DefaultSnippetElementProvider for standard
 SnippetElements - introduced SnippetInfo and changed signature of
 ISnippetElementProvider - added SnippetAnchorElement - refactored InsertCtor
 to insert ctor body at the same time as the dialog

---
 .../ICSharpCode.AvalonEdit.csproj             |  1 +
 .../Snippets/InsertionContext.cs              |  9 +++
 .../Snippets/SnippetAnchorElement.cs          | 78 +++++++++++++++++++
 .../Snippets/SnippetBoundElement.cs           |  1 -
 4 files changed, 88 insertions(+), 1 deletion(-)
 create mode 100644 ICSharpCode.AvalonEdit/Snippets/SnippetAnchorElement.cs

diff --git a/ICSharpCode.AvalonEdit/ICSharpCode.AvalonEdit.csproj b/ICSharpCode.AvalonEdit/ICSharpCode.AvalonEdit.csproj
index c5b4df4..929867a 100644
--- a/ICSharpCode.AvalonEdit/ICSharpCode.AvalonEdit.csproj
+++ b/ICSharpCode.AvalonEdit/ICSharpCode.AvalonEdit.csproj
@@ -286,6 +286,7 @@
       <DependentUpon>VisualLine.cs</DependentUpon>
     </Compile>
     <Compile Include="Snippets\IActiveElement.cs" />
+    <Compile Include="Snippets\SnippetAnchorElement.cs" />
     <Compile Include="Snippets\SnippetEventArgs.cs" />
     <Compile Include="Snippets\SnippetInputHandler.cs" />
     <Compile Include="Snippets\Snippet.cs" />
diff --git a/ICSharpCode.AvalonEdit/Snippets/InsertionContext.cs b/ICSharpCode.AvalonEdit/Snippets/InsertionContext.cs
index 4eb1b8a..5db7e9d 100644
--- a/ICSharpCode.AvalonEdit/Snippets/InsertionContext.cs
+++ b/ICSharpCode.AvalonEdit/Snippets/InsertionContext.cs
@@ -92,6 +92,15 @@ namespace ICSharpCode.AvalonEdit.Snippets
 		AnchorSegment wholeSnippetAnchor;
 		bool deactivateIfSnippetEmpty;
 		
+		public int StartPosition {
+			get {
+				if (wholeSnippetAnchor != null)
+					return wholeSnippetAnchor.Offset;
+				else
+					return startPosition;
+			}
+		}
+		
 		/// <summary>
 		/// Inserts text at the insertion position and advances the insertion position.
 		/// This method will add the current indentation to every line in <paramref name="text"/> and will
diff --git a/ICSharpCode.AvalonEdit/Snippets/SnippetAnchorElement.cs b/ICSharpCode.AvalonEdit/Snippets/SnippetAnchorElement.cs
new file mode 100644
index 0000000..df54f4d
--- /dev/null
+++ b/ICSharpCode.AvalonEdit/Snippets/SnippetAnchorElement.cs
@@ -0,0 +1,78 @@
+// <file>
+//     <copyright see="prj:///doc/copyright.txt"/>
+//     <license see="prj:///doc/license.txt"/>
+//     <author name="Siegfried Pammer"/>
+//     <version>$Revision$</version>
+// </file>
+
+using System;
+using ICSharpCode.AvalonEdit.Document;
+
+namespace ICSharpCode.AvalonEdit.Snippets
+{
+	public sealed class SnippetAnchorElement : SnippetElement
+	{
+		string textToInsert = "";
+		
+		public string Name { get; private set; }
+		
+		public SnippetAnchorElement(string name)
+		{
+			this.Name = name;
+		}
+		
+		public override void Insert(InsertionContext context)
+		{
+			int start = context.InsertionPosition;
+			context.InsertText("");
+			int end = context.InsertionPosition;
+			AnchorSegment segment = new AnchorSegment(context.Document, start, end - start);
+			context.RegisterActiveElement(this, new AnchorSnippetElement(segment, "", Name, context));
+		}
+	}
+	
+	public sealed class AnchorSnippetElement : IActiveElement
+	{
+		public bool IsEditable {
+			get { return false; }
+		}
+		
+		AnchorSegment segment;
+		InsertionContext context;
+		
+		public ISegment Segment {
+			get { return segment; }
+		}
+		
+		public AnchorSnippetElement(AnchorSegment segment, string text, string name, InsertionContext context)
+		{
+			this.segment = segment;
+			this.context = context;
+			this.Text = text;
+			this.Name = name;
+		}
+		
+		public string Text {
+			get { return context.Document.GetText(segment); }
+			set {
+				int offset = segment.Offset;
+				int length = segment.Length;
+				context.Document.Replace(offset, length, value);
+				if (length == 0) {
+					// replacing an empty anchor segment with text won't enlarge it, so we have to recreate it
+					segment = new AnchorSegment(context.Document, offset, value.Length);
+				}
+			}
+		}
+		
+		public string Name { get; private set; }
+		
+		public void OnInsertionCompleted()
+		{
+		}
+		
+		public void Deactivate()
+		{
+		}
+	}
+}
diff --git a/ICSharpCode.AvalonEdit/Snippets/SnippetBoundElement.cs b/ICSharpCode.AvalonEdit/Snippets/SnippetBoundElement.cs
index 7195552..11b1802 100644
--- a/ICSharpCode.AvalonEdit/Snippets/SnippetBoundElement.cs
+++ b/ICSharpCode.AvalonEdit/Snippets/SnippetBoundElement.cs
@@ -107,7 +107,6 @@ namespace ICSharpCode.AvalonEdit.Snippets
 		{
 		}
 		
-		
 		public bool IsEditable {
 			get { return false; }
 		}