93 lines
3.4 KiB
C#
93 lines
3.4 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;
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using System.Collections.Generic;
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using System.Runtime.CompilerServices;
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using Unity.CodeEditor.Document;
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using Unity.CodeEditor.Utils;
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namespace Unity.CodeEditor.Editing
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{
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sealed class EmptySelection : Selection
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{
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internal EmptySelection(TextArea textArea) : base(textArea)
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{
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}
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internal override Selection UpdateOnDocumentChange(DocumentChangeEventArgs e)
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{
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return this;
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}
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internal override TextViewPosition StartPosition => new TextViewPosition(TextLocation.Empty);
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internal override TextViewPosition EndPosition => new TextViewPosition(TextLocation.Empty);
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internal override ISegment SurroundingSegment => null;
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internal override Selection SetEndpoint(TextViewPosition endPosition)
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{
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throw new NotSupportedException();
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}
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internal override Selection StartSelectionOrSetEndpoint(TextViewPosition startPosition, TextViewPosition endPosition)
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{
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var document = TextArea.Document;
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if (document == null)
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throw ThrowUtil.NoDocumentAssigned();
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return Create(TextArea, startPosition, endPosition);
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}
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internal override IEnumerable<SelectionSegment> Segments => Empty<SelectionSegment>.Array;
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internal override string GetText()
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{
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return string.Empty;
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}
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internal override void ReplaceSelectionWithText(string newText)
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{
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if (newText == null)
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throw new ArgumentNullException(nameof(newText));
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newText = AddSpacesIfRequired(newText, TextArea.Caret.Position, TextArea.Caret.Position);
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if (newText.Length > 0)
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{
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if (TextArea.ReadOnlySectionProvider.CanInsert(TextArea.Caret.Offset))
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{
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TextArea.Document.Insert(TextArea.Caret.Offset, newText);
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}
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}
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TextArea.Caret.VisualColumn = -1;
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}
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internal override int Length => 0;
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// Use reference equality because there's only one EmptySelection per text area.
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public override int GetHashCode()
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{
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return RuntimeHelpers.GetHashCode(this);
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}
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public override bool Equals(object obj)
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{
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return this == obj;
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}
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}
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}
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