source: tags/3.3.12/HeuristicLab.ExtLibs/HeuristicLab.AvalonEdit/5.0.1/AvalonEdit-5.0.1/Snippets/SnippetCaretElement.cs

// Copyright (c) 2014 AlphaSierraPapa for the SharpDevelop Team
// 
// Permission is hereby granted, free of charge, to any person obtaining a copy of this
// software and associated documentation files (the "Software"), to deal in the Software
// without restriction, including without limitation the rights to use, copy, modify, merge,
// publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons
// to whom the Software is furnished to do so, subject to the following conditions:
// 
// The above copyright notice and this permission notice shall be included in all copies or
// substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
// PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
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using System;
using System.Runtime.Serialization;
using ICSharpCode.NRefactory.Editor;
using ICSharpCode.AvalonEdit.Document;

namespace ICSharpCode.AvalonEdit.Snippets
{
  /// <summary>
  /// Sets the caret position after interactive mode has finished.
  /// </summary>
  [Serializable]
  public class SnippetCaretElement : SnippetElement
  {
    [OptionalField]
    bool setCaretOnlyIfTextIsSelected;
    
    /// <summary>
    /// Creates a new SnippetCaretElement.
    /// </summary>
    public SnippetCaretElement()
    {
    }
    
    /// <summary>
    /// Creates a new SnippetCaretElement.
    /// </summary>
    /// <param name="setCaretOnlyIfTextIsSelected">
    /// If set to true, the caret is set only when some text was selected.
    /// This is useful when both SnippetCaretElement and SnippetSelectionElement are used in the same snippet.
    /// </param>
    public SnippetCaretElement(bool setCaretOnlyIfTextIsSelected)
    {
      this.setCaretOnlyIfTextIsSelected = setCaretOnlyIfTextIsSelected;
    }
    
    /// <inheritdoc/>
    public override void Insert(InsertionContext context)
    {
      if (!setCaretOnlyIfTextIsSelected || !string.IsNullOrEmpty(context.SelectedText))
        SetCaret(context);
    }
    
    internal static void SetCaret(InsertionContext context)
    {
      TextAnchor pos = context.Document.CreateAnchor(context.InsertionPosition);
      pos.MovementType = AnchorMovementType.BeforeInsertion;
      pos.SurviveDeletion = true;
      context.Deactivated += (sender, e) => {
        if (e.Reason == DeactivateReason.ReturnPressed || e.Reason == DeactivateReason.NoActiveElements) {
          context.TextArea.Caret.Offset = pos.Offset;
        }
      };
    }
  }
}