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