98 lines
2.5 KiB
C#
98 lines
2.5 KiB
C#
// Copyright (c) AlphaSierraPapa for the SharpDevelop Team (for details please see \doc\copyright.txt)
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// This code is distributed under the GNU LGPL (for details please see \doc\license.txt)
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using System;
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using ICSharpCode.AvalonEdit.Document;
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namespace ICSharpCode.AvalonEdit.Snippets
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{
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/// <summary>
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/// Creates a named anchor that can be accessed by other SnippetElements.
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/// </summary>
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public sealed class SnippetAnchorElement : SnippetElement
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{
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/// <summary>
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/// Gets or sets the name of the anchor.
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/// </summary>
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public string Name { get; private set; }
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/// <summary>
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/// Creates a SnippetAnchorElement with the supplied name.
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/// </summary>
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public SnippetAnchorElement(string name)
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{
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this.Name = name;
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}
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/// <inheritdoc />
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public override void Insert(InsertionContext context)
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{
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TextAnchor start = context.Document.CreateAnchor(context.InsertionPosition);
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start.MovementType = AnchorMovementType.BeforeInsertion;
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start.SurviveDeletion = true;
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AnchorSegment segment = new AnchorSegment(start, start);
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context.RegisterActiveElement(this, new AnchorElement(segment, Name, context));
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}
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}
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/// <summary>
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/// AnchorElement created by SnippetAnchorElement.
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/// </summary>
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public sealed class AnchorElement : IActiveElement
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{
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/// <inheritdoc />
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public bool IsEditable {
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get { return false; }
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}
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AnchorSegment segment;
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InsertionContext context;
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/// <inheritdoc />
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public ISegment Segment {
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get { return segment; }
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}
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/// <summary>
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/// Creates a new AnchorElement.
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/// </summary>
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public AnchorElement(AnchorSegment segment, string name, InsertionContext context)
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{
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this.segment = segment;
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this.context = context;
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this.Name = name;
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}
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/// <summary>
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/// Gets or sets the text at the anchor.
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/// </summary>
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public string Text {
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get { return context.Document.GetText(segment); }
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set {
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int offset = segment.Offset;
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int length = segment.Length;
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context.Document.Replace(offset, length, value);
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if (length == 0) {
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// replacing an empty anchor segment with text won't enlarge it, so we have to recreate it
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segment = new AnchorSegment(context.Document, offset, value.Length);
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}
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}
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}
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/// <summary>
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/// Gets or sets the name of the anchor.
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/// </summary>
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public string Name { get; private set; }
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/// <inheritdoc />
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public void OnInsertionCompleted()
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{
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}
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/// <inheritdoc />
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public void Deactivate(SnippetEventArgs e)
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{
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}
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}
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}
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