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// Copyright (c) 2013-2021 Jean-Philippe Bruyère <jp_bruyere@hotmail.com>
//
// This code is licensed under the MIT license (MIT) (http://opensource.org/licenses/MIT)
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Text;
namespace Crow.Text
{
public enum LineBreakKind
{
Undefined,
Unix,
Windows,
Other
}
/// <summary>
/// represent a single line span with end of line handling.
/// </summary>
[DebuggerDisplay ("{Start}, {Length}, {LengthInPixel}")]
public struct TextLine : IComparable<TextLine>
{
/// <summary>
/// Line start absolute character position.
/// </summary>
public int Start;
/// <summary>
/// Line's character count not including linebreak if any.
/// </summary>
public int Length;
/// <summary>
/// Total line's Character count including linebreak characters if any.
/// </summary>
public int LengthIncludingLineBreak;
/// <summary>
/// Cached line's length in pixel. If not yet computed by renderer, value is '-1'
/// </summary>
public int LengthInPixel;
/// <summary>
/// Absolute end character position just before linebreak if any.
/// </summary>
public int End => Start + Length;
public TextSpan Span => new TextSpan (Start, End);
public TextSpan SpanIncludingLineBreak => new TextSpan (Start, EndIncludingLineBreak);
/// <summary>
/// Absolute line's end position after linebreak if any.
/// </summary>
public int EndIncludingLineBreak => Start + LengthIncludingLineBreak;
/// <summary>
/// Character count of the linebreak, 0 if no linebreak.
/// </summary>
public int LineBreakLength => LengthIncludingLineBreak - Length;
/// <summary>
/// True line has a linebreak, false otherwise.
/// </summary>
public bool HasLineBreak => LineBreakLength > 0;
/// <summary>
/// Create a new TextLine span using the absolute start and end character positions.
/// </summary>
public TextLine (int start, int end, int endIncludingLineBreak) {
Start = start;
Length = end - start;
LengthIncludingLineBreak = endIncludingLineBreak - start;
LengthInPixel = -1;
}
/// <summary>
/// Create an empty line span without linebreak starting at absolute charater position given in argument.
/// </summary>
/// <param name="start"></param>
public TextLine (int start) {
Start = start;
Length = 0;
LengthIncludingLineBreak = 0;
LengthInPixel = -1;
}
/// <summary>
/// Set a new line's length and reset computed length in pixel to '-1'.
/// </summary>
/// <param name="newLength"></param>
public void SetLength (int newLength) {
LengthInPixel = -1;
Length = newLength;
}
/// <summary>
/// Create a new TextLine span with a start offset, length in pixel is reseted.
/// </summary>
/// <param name="start"></param>
/// <returns></returns>
public TextLine WithStartOffset (int start) => new TextLine (Start + start, End, EndIncludingLineBreak);
public int CompareTo (TextLine other) => Start - other.Start;
}
}
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