96 lines
2.5 KiB
C#
96 lines
2.5 KiB
C#
// Copyright (c) AlphaSierraPapa for the SharpDevelop Team (for details please see \doc\copyright.txt)
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// This code is distributed under the GNU LGPL (for details please see \doc\license.txt)
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using System;
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using System.ComponentModel;
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using ICSharpCode.AvalonEdit.Document;
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namespace ICSharpCode.AvalonEdit.Rendering
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{
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/// <summary>
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/// Represents a collapsed line section.
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/// Use the Uncollapse() method to uncollapse the section.
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/// </summary>
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public sealed class CollapsedLineSection
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{
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DocumentLine start, end;
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HeightTree heightTree;
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#if DEBUG
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internal string ID;
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static int nextId;
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#else
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const string ID = "";
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#endif
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internal CollapsedLineSection(HeightTree heightTree, DocumentLine start, DocumentLine end)
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{
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this.heightTree = heightTree;
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this.start = start;
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this.end = end;
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#if DEBUG
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unchecked {
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this.ID = " #" + (nextId++);
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}
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#endif
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}
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/// <summary>
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/// Gets if the document line is collapsed.
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/// This property initially is true and turns to false when uncollapsing the section.
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/// </summary>
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public bool IsCollapsed {
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get { return start != null; }
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}
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/// <summary>
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/// Gets the start line of the section.
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/// When the section is uncollapsed or the text containing it is deleted,
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/// this property returns null.
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/// </summary>
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public DocumentLine Start {
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get { return start; }
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internal set { start = value; }
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}
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/// <summary>
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/// Gets the end line of the section.
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/// When the section is uncollapsed or the text containing it is deleted,
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/// this property returns null.
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/// </summary>
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public DocumentLine End {
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get { return end; }
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internal set { end = value; }
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}
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/// <summary>
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/// Uncollapses the section.
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/// This causes the Start and End properties to be set to null!
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/// Does nothing if the section is already uncollapsed.
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/// </summary>
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public void Uncollapse()
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{
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if (start == null)
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return;
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heightTree.Uncollapse(this);
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#if DEBUG
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heightTree.CheckProperties();
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#endif
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start = null;
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end = null;
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}
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/// <summary>
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/// Gets a string representation of the collapsed section.
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/// </summary>
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[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Globalization", "CA1305:SpecifyIFormatProvider", MessageId = "System.Int32.ToString")]
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public override string ToString()
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{
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return "[CollapsedSection" + ID + " Start=" + (start != null ? start.LineNumber.ToString() : "null")
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+ " End=" + (end != null ? end.LineNumber.ToString() : "null") + "]";
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}
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}
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}
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