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Viewing changes to contrib/ICSharpCode.NRefactory/Editor/TextChangeEventArgs.cs

  • Committer: Package Import Robot
  • Author(s): Jo Shields
  • Date: 2013-05-12 09:46:03 UTC
  • mto: This revision was merged to the branch mainline in revision 29.
  • Revision ID: package-import@ubuntu.com-20130512094603-mad323bzcxvmcam0
Tags: upstream-4.0.5+dfsg
Import upstream version 4.0.5+dfsg

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contrib/ICSharpCode.NRefactory/Editor/TextChangeEventArgs.cs
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// Copyright (c) AlphaSierraPapa for the SharpDevelop Team
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// 
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// Permission is hereby granted, free of charge, to any person obtaining a copy of this
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// software and associated documentation files (the "Software"), to deal in the Software
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// without restriction, including without limitation the rights to use, copy, modify, merge,
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// publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons
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// to whom the Software is furnished to do so, subject to the following conditions:
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// 
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// The above copyright notice and this permission notice shall be included in all copies or
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// substantial portions of the Software.
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// 
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
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// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
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// PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
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// FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
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// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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// DEALINGS IN THE SOFTWARE.
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using System;
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namespace ICSharpCode.NRefactory.Editor
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{
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        /// <summary>
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        /// Describes a change of the document text.
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        /// This class is thread-safe.
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        /// </summary>
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        [Serializable]
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        public class TextChangeEventArgs : EventArgs
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        {
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                readonly int offset;
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                readonly string removedText;
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                readonly string insertedText;
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                /// <summary>
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                /// The offset at which the change occurs.
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                /// </summary>
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                public int Offset {
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                        get { return offset; }
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                }
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                /// <summary>
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                /// The text that was removed.
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                /// </summary>
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                public string RemovedText {
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                        get { return removedText; }
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                }
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                /// <summary>
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                /// The number of characters removed.
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                /// </summary>
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                public int RemovalLength {
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                        get { return removedText.Length; }
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                }
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                /// <summary>
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                /// The text that was inserted.
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                /// </summary>
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                public string InsertedText {
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                        get { return insertedText; }
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                }
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                /// <summary>
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                /// The number of characters inserted.
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                /// </summary>
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                public int InsertionLength {
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                        get { return insertedText.Length; }
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                }
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                /// <summary>
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                /// Creates a new TextChangeEventArgs object.
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                /// </summary>
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                public TextChangeEventArgs(int offset, string removedText, string insertedText)
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                {
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                        this.offset = offset;
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                        this.removedText = removedText ?? string.Empty;
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                        this.insertedText = insertedText ?? string.Empty;
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                }
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                /// <summary>
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                /// Gets the new offset where the specified offset moves after this document change.
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                /// </summary>
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                public virtual int GetNewOffset(int offset, AnchorMovementType movementType = AnchorMovementType.Default)
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                {
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                        if (offset >= this.Offset && offset <= this.Offset + this.RemovalLength) {
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                                if (movementType == AnchorMovementType.BeforeInsertion)
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                                        return this.Offset;
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                                else
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                                        return this.Offset + this.InsertionLength;
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                        } else if (offset > this.Offset) {
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                                return offset + this.InsertionLength - this.RemovalLength;
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                        } else {
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                                return offset;
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                        }
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                }
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                /// <summary>
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                /// Creates TextChangeEventArgs for the reverse change.
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                /// </summary>
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                public virtual TextChangeEventArgs Invert()
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                {
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                        return new TextChangeEventArgs(offset, insertedText, removedText);
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                }
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        }
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}