/// <summary>
/// format text line using LS
/// </summary>
/// <param name="fullText">state of the full text backing store</param>
/// <param name="cpFirst">first cp to format</param>
/// <param name="lineLength">character length of the line</param>
/// <param name="formatWidth">width used to format</param>
/// <param name="finiteFormatWidth">width used to detect overflowing of format result</param>
/// <param name="paragraphWidth">paragraph width</param>
/// <param name="lineFlags">line formatting control flags</param>
/// <param name="collapsingSymbol">line end collapsing symbol</param>
private void FormatLine(
FullTextState fullText,
int cpFirst,
int lineLength,
int formatWidth,
int finiteFormatWidth,
int paragraphWidth,
LineFlags lineFlags,
FormattedTextSymbols collapsingSymbol
)
{
_fullText = fullText;
_paragraphWidth = paragraphWidth;
TextStore store = fullText.TextStore;
FormatSettings settings = store.Settings;
ParaProp pap = settings.Pap;
_paragraphTextDecorations = pap.TextDecorations;
if (_paragraphTextDecorations != null)
{
if (_paragraphTextDecorations.Count != 0)
{
_defaultTextDecorationsBrush = pap.DefaultTextDecorationsBrush;
}
else
{
_paragraphTextDecorations = null;
}
}
_metrics = GetLineMetrics(fullText, cpFirst, lineLength, formatWidth, finiteFormatWidth, paragraphWidth, lineFlags, collapsingSymbol);
lineLength = _metrics._cchLength;
if (lineLength > _metrics._cchNewline)
{
var lineBreakpoints = store.FindLineBreakpoints(cpFirst, lineLength);
// check for line wrap
if (pap.Wrap && _metrics._textStart + _metrics._textWidthAtTrailing > finiteFormatWidth)
{
for (int i = lineLength - 1; i > 0; i--)
{
if (lineBreakpoints.GetBreakConditionBefore(i + cpFirst) == DWriteBreakCondition.CanBreak)
{
var trailingWhitespace = lineBreakpoints.WhitespaceLengthBefore(i + cpFirst);
var trimmedMetrics = GetLineMetrics(fullText, cpFirst, i - trailingWhitespace, formatWidth, finiteFormatWidth, paragraphWidth, lineFlags, collapsingSymbol);
if (trimmedMetrics._textStart + trimmedMetrics._textWidthAtTrailing <= finiteFormatWidth)
{
_metrics = GetLineMetrics(fullText, cpFirst, i, formatWidth, finiteFormatWidth, paragraphWidth, lineFlags, collapsingSymbol);
_metrics._cchTrailing = trailingWhitespace;
_metrics._textWidthAtTrailing = trimmedMetrics._textWidth;
break;
}
}
}
}
}
if (collapsingSymbol == null)
{
// overflow detection for potential collapsible line
if (_metrics._textStart + _metrics._textWidthAtTrailing > finiteFormatWidth)
{
bool hasOverflowed = true;
if (_textFormattingMode == TextFormattingMode.Display)
{
// apply display-mode rounding before checking for overflow
double realWidth = Width;
double realFormatWidth = _metrics._formatter.IdealToReal(finiteFormatWidth, PixelsPerDip);
hasOverflowed = (TextFormatterImp.CompareReal(realWidth, realFormatWidth, PixelsPerDip, _textFormattingMode) > 0);
}
if (hasOverflowed)
{
// line has overflowed
_statusFlags |= StatusFlags.HasOverflowed;
}
}
}
}
