source: trunk/HeuristicLab.ExtLibs/HeuristicLab.AvalonEdit/5.0.1/AvalonEdit-5.0.1/TextViewPosition.cs @ 17495

// 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.Globalization;
using ICSharpCode.NRefactory;
using ICSharpCode.AvalonEdit.Document;

namespace ICSharpCode.AvalonEdit
{
  /// <summary>
  /// Represents a text location with a visual column.
  /// </summary>
  public struct TextViewPosition : IEquatable<TextViewPosition>, IComparable<TextViewPosition>
  {
    int line, column, visualColumn;
    bool isAtEndOfLine;
    
    /// <summary>
    /// Gets/Sets Location.
    /// </summary>
    public TextLocation Location {
      get {
        return new TextLocation(line, column);
      }
      set {
        line = value.Line;
        column = value.Column;
      }
    }
    
    /// <summary>
    /// Gets/Sets the line number.
    /// </summary>
    public int Line {
      get { return line; }
      set { line = value; }
    }
    
    /// <summary>
    /// Gets/Sets the (text) column number.
    /// </summary>
    public int Column {
      get { return column; }
      set { column = value; }
    }
    
    /// <summary>
    /// Gets/Sets the visual column number.
    /// Can be -1 (meaning unknown visual column).
    /// </summary>
    public int VisualColumn {
      get { return visualColumn; }
      set { visualColumn = value; }
    }
    
    /// <summary>
    /// When word-wrap is enabled and a line is wrapped at a position where there is no space character;
    /// then both the end of the first TextLine and the beginning of the second TextLine
    /// refer to the same position in the document, and also have the same visual column.
    /// In this case, the IsAtEndOfLine property is used to distinguish between the two cases:
    /// the value <c>true</c> indicates that the position refers to the end of the previous TextLine;
    /// the value <c>false</c> indicates that the position refers to the beginning of the next TextLine.
    /// 
    /// If this position is not at such a wrapping position, the value of this property has no effect.
    /// </summary>
    public bool IsAtEndOfLine {
      get { return isAtEndOfLine; }
      set { isAtEndOfLine = value; }
    }
    
    /// <summary>
    /// Creates a new TextViewPosition instance.
    /// </summary>
    public TextViewPosition(int line, int column, int visualColumn)
    {
      this.line = line;
      this.column = column;
      this.visualColumn = visualColumn;
      this.isAtEndOfLine = false;
    }
    
    /// <summary>
    /// Creates a new TextViewPosition instance.
    /// </summary>
    public TextViewPosition(int line, int column)
      : this(line, column, -1)
    {
    }
    
    /// <summary>
    /// Creates a new TextViewPosition instance.
    /// </summary>
    public TextViewPosition(TextLocation location, int visualColumn)
    {
      this.line = location.Line;
      this.column = location.Column;
      this.visualColumn = visualColumn;
      this.isAtEndOfLine = false;
    }
    
    /// <summary>
    /// Creates a new TextViewPosition instance.
    /// </summary>
    public TextViewPosition(TextLocation location)
      : this(location, -1)
    {
    }
    
    /// <inheritdoc/>
    public override string ToString()
    {
      return string.Format(CultureInfo.InvariantCulture,
                           "[TextViewPosition Line={0} Column={1} VisualColumn={2} IsAtEndOfLine={3}]",
                           this.line, this.column, this.visualColumn, this.isAtEndOfLine);
    }
    
    #region Equals and GetHashCode implementation
    // The code in this region is useful if you want to use this structure in collections.
    // If you don't need it, you can just remove the region and the ": IEquatable<Struct1>" declaration.
    
    /// <inheritdoc/>
    public override bool Equals(object obj)
    {
      if (obj is TextViewPosition)
        return Equals((TextViewPosition)obj); // use Equals method below
      else
        return false;
    }
    
    /// <inheritdoc/>
    public override int GetHashCode()
    {
      int hashCode = isAtEndOfLine ? 115817 : 0;
      unchecked {
        hashCode += 1000000007 * Line.GetHashCode();
        hashCode += 1000000009 * Column.GetHashCode();
        hashCode += 1000000021 * VisualColumn.GetHashCode();
      }
      return hashCode;
    }
    
    /// <summary>
    /// Equality test.
    /// </summary>
    public bool Equals(TextViewPosition other)
    {
      return this.Line == other.Line && this.Column == other.Column && this.VisualColumn == other.VisualColumn && this.IsAtEndOfLine == other.IsAtEndOfLine;
    }
    
    /// <summary>
    /// Equality test.
    /// </summary>
    public static bool operator ==(TextViewPosition left, TextViewPosition right)
    {
      return left.Equals(right);
    }
    
    /// <summary>
    /// Inequality test.
    /// </summary>
    public static bool operator !=(TextViewPosition left, TextViewPosition right)
    {
      return !(left.Equals(right)); // use operator == and negate result
    }
    #endregion
    
    /// <inheritdoc/>
    public int CompareTo(TextViewPosition other)
    {
      int r = this.Location.CompareTo(other.Location);
      if (r != 0)
        return r;
      r = this.visualColumn.CompareTo(other.visualColumn);
      if (r != 0)
        return r;
      if (isAtEndOfLine && !other.isAtEndOfLine)
        return -1;
      else if (!isAtEndOfLine && other.isAtEndOfLine)
        return 1;
      return 0;
    }
  }
}