private static TextLineRun CreateRunForTab(TextRun textRun, TextParagraphProperties paragraphProperties)
{
var tabRun = new TextCharacters(TabString, textRun.Properties);
var stringRange = tabRun.StringRange;
var run = new TextLineRun(1, tabRun)
{
IsTab = true,
StringRange = stringRange,
Width = paragraphProperties.DefaultIncrementalTab
};
run._glyphWidths = new double[] { run.Width };
return(run);
}
private static TextLineRun CreateRunForTab(TextRun textRun)
{
var spaceRun = new TextCharacters(" ", textRun.Properties);
var stringRange = spaceRun.StringRange;
var run = new TextLineRun(1, spaceRun)
{
IsTab = true,
StringRange = stringRange,
// TODO: get from para props
Width = 40
};
run.SetGlyphWidths();
return(run);
}
internal static TextLineRun CreateRunForText(
StringRange stringRange,
TextRun textRun,
double widthLeft,
TextParagraphProperties paragraphProperties)
{
TextLineRun run = CreateTextLineRun(stringRange, textRun, textRun.Length, paragraphProperties);
if (run.Width <= widthLeft)
{
return(run);
}
TextLineRun wrapped = PerformTextWrapping(run, widthLeft, paragraphProperties);
wrapped.Width = run.Width;
return(wrapped);
}
internal static TextLineRun CreateRunForText(StringRange stringRange, TextRun textRun, int widthLeft, bool emergencyWrap, bool breakOnTabs)
{
var run = new TextLineRun
{
StringRange = stringRange,
TextRun = textRun,
Length = textRun.Length
};
var formattedText = new FormattedText(stringRange.ToString(),
run.Typeface, run.FontSize);
run._formattedText = formattedText;
var size = formattedText.Measure();
run._formattedTextSize = size;
run.Width = (int)size.Width;
run.SetGlyphWidths();
return(run);
}
private TextLineRun(int length, TextRun textRun)
{
Length = length;
TextRun = textRun;
}
private static TextLineRun CreateRunForSpecialChars(TextSource textSource, StringRange stringRange, TextRun textRun, int index, TextParagraphProperties paragraphProperties)
{
switch (stringRange[0])
{
case '\r':
var runLength = 1;
if (stringRange.Length > 1 && stringRange[1] == '\n')
{
runLength = 2;
}
else if (stringRange.Length == 1)
{
var nextRun = textSource.GetTextRun(index + 1);
var range = nextRun.GetStringRange();
if (range.Length > 0 && range[0] == '\n')
{
var eolRun = new TextCharacters(NewlineString, textRun.Properties);
return(new TextLineRun(eolRun.Length, eolRun)
{
IsEnd = true
});
}
}
return(new TextLineRun(runLength, textRun)
{
IsEnd = true
});
case '\n':
return(new TextLineRun(1, textRun)
{
IsEnd = true
});
case '\t':
return(CreateRunForTab(textRun, paragraphProperties));
default:
return(null);
}
}
private static TextLineRun Create(TextSource textSource, StringRange stringRange, TextRun textRun, int index, double widthLeft, TextParagraphProperties paragraphProperties)
{
if (textRun is TextCharacters)
{
return(CreateRunForSpecialChars(textSource, stringRange, textRun, index, paragraphProperties) ??
CreateRunForText(stringRange, textRun, widthLeft, paragraphProperties));
}
if (textRun is TextEndOfLine)
{
return(new TextLineRun(textRun.Length, textRun)
{
IsEnd = true
});
}
if (textRun is TextEmbeddedObject embeddedObject)
{
double width = embeddedObject.GetSize(double.PositiveInfinity).Width;
return(new TextLineRun(textRun.Length, textRun)
{
IsEmbedded = true,
_glyphWidths = new double[] { width },
// Embedded objects must propagate their width to the container.
// Otherwise text runs after the embedded object are drawn at the same x position.
Width = width
});
}
throw new NotSupportedException("Unsupported run type");
}
private static TextLineRun Create(TextSource textSource, StringRange stringRange, TextRun textRun, int index, int widthLeft)
{
if (textRun is TextCharacters)
{
return(CreateRunForEol(textSource, stringRange, textRun, index) ??
CreateRunForText(stringRange, textRun, widthLeft, false, true));
}
if (textRun is TextEndOfLine)
{
return(new TextLineRun(textRun.Length, textRun)
{
IsEnd = true
});
}
if (textRun is TextEmbeddedObject)
{
return(new TextLineRun(textRun.Length, textRun)
{
IsEmbedded = true, _glyphWidths = new int[textRun.Length]
});
}
throw new NotSupportedException("Unsupported run type");
}
