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// Copyright (c) AlphaSierraPapa for the SharpDevelop Team (for details please see \doc\copyright.txt)
// This code is distributed under the GNU LGPL (for details please see \doc\license.txt)
using System;
using Tango.Scripting.Editors.Document;
namespace Tango.Scripting.Editors.Snippets
{
/// <summary>
/// Creates a named anchor that can be accessed by other SnippetElements.
/// </summary>
public sealed class SnippetAnchorElement : SnippetElement
{
/// <summary>
/// Gets or sets the name of the anchor.
/// </summary>
public string Name { get; private set; }
/// <summary>
/// Creates a SnippetAnchorElement with the supplied name.
/// </summary>
public SnippetAnchorElement(string name)
{
this.Name = name;
}
/// <inheritdoc />
public override void Insert(InsertionContext context)
{
TextAnchor start = context.Document.CreateAnchor(context.InsertionPosition);
start.MovementType = AnchorMovementType.BeforeInsertion;
start.SurviveDeletion = true;
AnchorSegment segment = new AnchorSegment(start, start);
context.RegisterActiveElement(this, new AnchorElement(segment, Name, context));
}
}
/// <summary>
/// AnchorElement created by SnippetAnchorElement.
/// </summary>
public sealed class AnchorElement : IActiveElement
{
/// <inheritdoc />
public bool IsEditable {
get { return false; }
}
AnchorSegment segment;
InsertionContext context;
/// <inheritdoc />
public ISegment Segment {
get { return segment; }
}
/// <summary>
/// Creates a new AnchorElement.
/// </summary>
public AnchorElement(AnchorSegment segment, string name, InsertionContext context)
{
this.segment = segment;
this.context = context;
this.Name = name;
}
/// <summary>
/// Gets or sets the text at the anchor.
/// </summary>
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);
}
}
}
/// <summary>
/// Gets or sets the name of the anchor.
/// </summary>
public string Name { get; private set; }
/// <inheritdoc />
public void OnInsertionCompleted()
{
}
/// <inheritdoc />
public void Deactivate(SnippetEventArgs e)
{
}
}
}
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