67 lines
2.4 KiB
C#
67 lines
2.4 KiB
C#
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// Copyright (c) 2014 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.Diagnostics;
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namespace Unity.CodeEditor.Document
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{
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/// <summary>
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/// Describes a change to a TextDocument.
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/// </summary>
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internal sealed class DocumentChangeOperation : IUndoableOperationWithContext
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{
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private readonly TextDocument _document;
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private readonly DocumentChangeEventArgs _change;
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internal DocumentChangeOperation(TextDocument document, DocumentChangeEventArgs change)
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{
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_document = document;
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_change = change;
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}
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public void Undo(UndoStack stack)
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{
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Debug.Assert(stack.State == UndoStack.StatePlayback);
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stack.RegisterAffectedDocument(_document);
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stack.State = UndoStack.StatePlaybackModifyDocument;
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Undo();
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stack.State = UndoStack.StatePlayback;
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}
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public void Redo(UndoStack stack)
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{
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Debug.Assert(stack.State == UndoStack.StatePlayback);
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stack.RegisterAffectedDocument(_document);
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stack.State = UndoStack.StatePlaybackModifyDocument;
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Redo();
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stack.State = UndoStack.StatePlayback;
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}
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public void Undo()
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{
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var map = _change.OffsetChangeMapOrNull;
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_document.Replace(_change.Offset, _change.InsertionLength, _change.RemovedText, map?.Invert());
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}
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public void Redo()
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{
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_document.Replace(_change.Offset, _change.RemovalLength, _change.InsertedText, _change.OffsetChangeMapOrNull);
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}
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}
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}
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