source: branches/3107_LearningALPS/HeuristicLab.ExtLibs/HeuristicLab.AvalonEdit/5.0.1/AvalonEdit-5.0.1/Editing/SelectionSegment.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;
#if NREFACTORY
using ICSharpCode.NRefactory.Editor;
#else
using ICSharpCode.AvalonEdit.Document;
#endif

namespace ICSharpCode.AvalonEdit.Editing
{
  /// <summary>
  /// Represents a selected segment.
  /// </summary>
  public class SelectionSegment : ISegment
  {
    readonly int startOffset, endOffset;
    readonly int startVC, endVC;
    
    /// <summary>
    /// Creates a SelectionSegment from two offsets.
    /// </summary>
    public SelectionSegment(int startOffset, int endOffset)
    {
      this.startOffset = Math.Min(startOffset, endOffset);
      this.endOffset = Math.Max(startOffset, endOffset);
      this.startVC = this.endVC = -1;
    }
    
    /// <summary>
    /// Creates a SelectionSegment from two offsets and visual columns.
    /// </summary>
    public SelectionSegment(int startOffset, int startVC, int endOffset, int endVC)
    {
      if (startOffset < endOffset || (startOffset == endOffset && startVC <= endVC)) {
        this.startOffset = startOffset;
        this.startVC = startVC;
        this.endOffset = endOffset;
        this.endVC = endVC;
      } else {
        this.startOffset = endOffset;
        this.startVC = endVC;
        this.endOffset = startOffset;
        this.endVC = startVC;
      }
    }
    
    /// <summary>
    /// Gets the start offset.
    /// </summary>
    public int StartOffset {
      get { return startOffset; }
    }
    
    /// <summary>
    /// Gets the end offset.
    /// </summary>
    public int EndOffset {
      get { return endOffset; }
    }
    
    /// <summary>
    /// Gets the start visual column.
    /// </summary>
    public int StartVisualColumn {
      get { return startVC; }
    }
    
    /// <summary>
    /// Gets the end visual column.
    /// </summary>
    public int EndVisualColumn {
      get { return endVC; }
    }
    
    /// <inheritdoc/>
    int ISegment.Offset {
      get { return startOffset; }
    }
    
    /// <inheritdoc/>
    public int Length {
      get { return endOffset - startOffset; }
    }
    
    /// <inheritdoc/>
    public override string ToString()
    {
      return string.Format("[SelectionSegment StartOffset={0}, EndOffset={1}, StartVC={2}, EndVC={3}]", startOffset, endOffset, startVC, endVC);
    }
  }
}