source: branches/2645_ContextAlgorithms/HeuristicLab.ExtLibs/HeuristicLab.AvalonEdit/5.0.1/AvalonEdit-5.0.1/Rendering/CollapsedLineSection.cs

// Copyright (c) 2014 AlphaSierraPapa for the SharpDevelop Team
// 
// Permission is hereby granted, free of charge, to any person obtaining a copy of this
// software and associated documentation files (the "Software"), to deal in the Software
// without restriction, including without limitation the rights to use, copy, modify, merge,
// publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons
// to whom the Software is furnished to do so, subject to the following conditions:
// 
// The above copyright notice and this permission notice shall be included in all copies or
// substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
// PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
// FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.

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") + "]";
    }
  }
}