public bool UpdateTrailingInfo(TrailingInfo trailing)
{
if (IsEnd)
{
return(true);
}
if (IsTab)
{
return(false);
}
var index = Length;
if (index > 0 && IsSpace(StringRange[index - 1]))
{
while (index > 0 && IsSpace(StringRange[index - 1]))
{
trailing.SpaceWidth += _glyphWidths[index - 1];
index--;
trailing.Count++;
}
return(index == 0);
}
return(false);
}
internal static TextLineImpl Create(TextParagraphProperties paragraphProperties, int firstIndex, double availableWidth, TextSource textSource)
{
var index = firstIndex;
var visibleLength = 0;
var widthLeft = paragraphProperties.TextWrapping == TextWrapping.Wrap && availableWidth > 0 ? availableWidth : double.MaxValue;
widthLeft -= paragraphProperties.Margin.Left + paragraphProperties.Margin.Right;
if (widthLeft < paragraphProperties.DefaultTextRunProperties.FontSize)
{
widthLeft = paragraphProperties.DefaultTextRunProperties.FontSize;
}
TextLineRun prevRun = null;
var run = TextLineRun.Create(textSource, index, firstIndex, widthLeft);
if (!run.IsEnd && run.Width <= widthLeft)
{
index += run.Length;
widthLeft -= run.Width;
prevRun = run;
run = TextLineRun.Create(textSource, index, firstIndex, widthLeft);
}
var trailing = new TrailingInfo();
var runs = new List <TextLineRun>(2);
if (prevRun != null)
{
visibleLength += AddRunReturnVisibleLength(runs, prevRun);
}
if (visibleLength >= MaxCharactersPerLine)
{
throw new NotSupportedException("Too many characters per line");
}
while (true)
{
visibleLength += AddRunReturnVisibleLength(runs, run);
index += run.Length;
widthLeft -= run.Width;
if (run.IsEnd || widthLeft <= 0)
{
if (!run.IsEnd && widthLeft <= 0)
{
//The text needs to be wrapped
CalculateLineBreak(runs);
}
trailing.SpaceWidth = 0;
UpdateTrailingInfo(runs, trailing);
return(new TextLineImpl(paragraphProperties, firstIndex, runs, trailing));
}
run = TextLineRun.Create(textSource, index, firstIndex, widthLeft);
}
}
private static void UpdateTrailingInfo(List <TextLineRun> runs, TrailingInfo trailing)
{
for (var index = (runs?.Count ?? 0) - 1; index >= 0; index--)
{
// ReSharper disable once PossibleNullReferenceException
if (!runs[index].UpdateTrailingInfo(trailing))
{
return;
}
}
}
internal static TextLineImpl Create(TextParagraphProperties paragraphProperties, int firstIndex, int paragraphLength, TextSource textSource)
{
var index = firstIndex;
var visibleLength = 0;
var widthLeft = paragraphLength > 0 ? paragraphLength : int.MaxValue;
TextLineRun prevRun = null;
var run = TextLineRun.Create(textSource, index, firstIndex, widthLeft);
if (!run.IsEnd && run.Width <= widthLeft)
{
index += run.Length;
widthLeft -= run.Width;
prevRun = run;
run = TextLineRun.Create(textSource, index, firstIndex, widthLeft);
}
var trailing = new TrailingInfo();
var runs = new List <TextLineRun>(2);
if (prevRun != null)
{
visibleLength += AddRunReturnVisibleLength(runs, prevRun);
}
if (visibleLength >= MaxCharactersPerLine)
{
throw new NotSupportedException("Too many characters per line");
}
while (run.IsEnd || run.Width <= widthLeft)
{
visibleLength += AddRunReturnVisibleLength(runs, run);
index += run.Length;
widthLeft -= run.Width;
if (run.IsEnd)
{
trailing.SpaceWidth = 0;
UpdateTrailingInfo(runs, trailing);
return(new TextLineImpl(paragraphProperties, firstIndex, runs, trailing));
}
run = TextLineRun.Create(textSource, index, firstIndex, widthLeft);
}
return(null);
}
internal static TextLineImpl Create(TextParagraphProperties paragraphProperties, int firstIndex, int paragraphLength, TextSource textSource)
{
var index = firstIndex;
var visibleLength = 0;
var widthLeft = paragraphProperties.TextWrapping == TextWrapping.Wrap && paragraphLength > 0 ? paragraphLength : double.MaxValue;
TextLineRun prevRun = null;
var run = TextLineRun.Create(textSource, index, firstIndex, widthLeft, paragraphProperties);
if (!run.IsEnd && run.Width <= widthLeft)
{
index += run.Length;
widthLeft -= run.Width;
prevRun = run;
run = TextLineRun.Create(textSource, index, firstIndex, widthLeft, paragraphProperties);
}
var trailing = new TrailingInfo();
var runs = new List <TextLineRun>(2);
if (prevRun != null)
{
visibleLength += AddRunReturnVisibleLength(runs, prevRun);
}
while (true)
{
visibleLength += AddRunReturnVisibleLength(runs, run);
index += run.Length;
widthLeft -= run.Width;
if (run.IsEnd || widthLeft <= 0)
{
trailing.SpaceWidth = 0;
UpdateTrailingInfo(runs, trailing);
return(new TextLineImpl(paragraphProperties, firstIndex, runs, trailing));
}
run = TextLineRun.Create(textSource, index, firstIndex, widthLeft, paragraphProperties);
if (run.Width > widthLeft)
{
return(new TextLineImpl(paragraphProperties, firstIndex, runs, trailing));
}
}
}
private TextLineImpl(TextParagraphProperties paragraphProperties, int firstIndex, List <TextLineRun> runs, TrailingInfo trailing)
{
var top = 0.0;
var height = 0.0;
var index = 0;
_runs = new TextLineRun[runs.Count];
foreach (var run in runs)
{
_runs[index++] = run;
if (run.Length <= 0)
{
continue;
}
if (run.IsEnd)
{
trailing.Count += run.Length;
}
else
{
top = Math.Max(top, run.Height - run.Baseline);
height = Math.Max(height, run.Height);
Baseline = Math.Max(Baseline, run.Baseline);
}
Length += run.Length;
WidthIncludingTrailingWhitespace += run.Width;
}
if (height <= 0)
{
var fontSize = paragraphProperties.DefaultTextRunProperties.FontSize;
Height = fontSize * TextLineRun.HeightFactor + paragraphProperties.Margin.Top + paragraphProperties.LineSpacing;
Baseline = fontSize * TextLineRun.BaselineFactor + paragraphProperties.Margin.Top + paragraphProperties.LineSpacing;
}
else
{
Baseline += paragraphProperties.Margin.Top + paragraphProperties.LineSpacing;
Height = Math.Max(height, Baseline + top);
}
if (runs[^ 1].IsEnd)
private TextLineImpl(TextParagraphProperties paragraphProperties, int firstIndex, List <TextLineRun> runs, TrailingInfo trailing)
{
var top = 0.0;
var height = 0.0;
var index = 0;
_runs = new TextLineRun[runs.Count];
foreach (var run in runs)
{
_runs[index++] = run;
if (run.Length <= 0)
{
continue;
}
if (run.IsEnd)
{
trailing.Count += run.Length;
}
else
{
top = Math.Max(top, run.Height - run.Baseline);
height = Math.Max(height, run.Height);
Baseline = Math.Max(Baseline, run.Baseline);
}
Length += run.Length;
WidthIncludingTrailingWhitespace += run.Width;
}
Height = Math.Max(height, Baseline + top);
if (Height <= 0)
{
Height = TextLineRun.GetDefaultLineHeight(paragraphProperties.DefaultTextRunProperties.FontMetrics);
Baseline = TextLineRun.GetDefaultBaseline(paragraphProperties.DefaultTextRunProperties.FontMetrics);
}
FirstIndex = firstIndex;
TrailingWhitespaceLength = trailing.Count;
Width = WidthIncludingTrailingWhitespace - trailing.SpaceWidth;
}
