106 lines
4.1 KiB
C#
106 lines
4.1 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;
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namespace Unity.CodeEditor.Document
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{
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/// <summary>
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/// Allows registering a line tracker on a TextDocument using a weak reference from the document to the line tracker.
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/// </summary>
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internal sealed class WeakLineTracker : ILineTracker
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{
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private TextDocument _textDocument;
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private readonly WeakReference _targetObject;
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private WeakLineTracker(TextDocument textDocument, ILineTracker targetTracker)
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{
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_textDocument = textDocument;
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_targetObject = new WeakReference(targetTracker);
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}
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/// <summary>
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/// Registers the <paramref name="targetTracker"/> as line tracker for the <paramref name="textDocument"/>.
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/// A weak reference to the target tracker will be used, and the WeakLineTracker will deregister itself
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/// when the target tracker is garbage collected.
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/// </summary>
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internal static WeakLineTracker Register(TextDocument textDocument, ILineTracker targetTracker)
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{
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if (textDocument == null)
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throw new ArgumentNullException(nameof(textDocument));
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if (targetTracker == null)
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throw new ArgumentNullException(nameof(targetTracker));
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var wlt = new WeakLineTracker(textDocument, targetTracker);
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textDocument.LineTrackers.Add(wlt);
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return wlt;
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}
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/// <summary>
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/// Deregisters the weak line tracker.
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/// </summary>
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internal void Deregister()
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{
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if (_textDocument != null)
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{
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_textDocument.LineTrackers.Remove(this);
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_textDocument = null;
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}
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}
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void ILineTracker.BeforeRemoveLine(DocumentLine line)
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{
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if (_targetObject.Target is ILineTracker targetTracker)
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targetTracker.BeforeRemoveLine(line);
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else
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Deregister();
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}
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void ILineTracker.SetLineLength(DocumentLine line, int newTotalLength)
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{
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if (_targetObject.Target is ILineTracker targetTracker)
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targetTracker.SetLineLength(line, newTotalLength);
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else
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Deregister();
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}
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void ILineTracker.LineInserted(DocumentLine insertionPos, DocumentLine newLine)
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{
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if (_targetObject.Target is ILineTracker targetTracker)
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targetTracker.LineInserted(insertionPos, newLine);
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else
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Deregister();
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}
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void ILineTracker.RebuildDocument()
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{
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if (_targetObject.Target is ILineTracker targetTracker)
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targetTracker.RebuildDocument();
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else
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Deregister();
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}
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void ILineTracker.ChangeComplete(DocumentChangeEventArgs e)
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{
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if (_targetObject.Target is ILineTracker targetTracker)
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targetTracker.ChangeComplete(e);
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else
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Deregister();
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}
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}
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}
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