internal FormatSettings(
TextFormatterImp formatter,
TextSource textSource,
TextRunCacheImp runCache,
ParaProp pap,
TextLineBreak previousLineBreak,
bool isSingleLineFormatting,
TextFormattingMode textFormattingMode,
bool isSideways
)
{
_isSideways = isSideways;
_textFormattingMode = textFormattingMode;
_formatter = formatter;
_textSource = textSource;
_runCache = runCache;
_pap = pap;
_digitState = new DigitState();
_previousLineBreak = previousLineBreak;
_maxLineWidth = Constants.IdealInfiniteWidth;
if (isSingleLineFormatting)
{
// Apply text indent on each line in single line mode
_textIndent = _pap.Indent;
}
}
private TextMetrics GetRunMetrics(FullTextState textState, TextRun textRun, CharacterBufferRange chars)
{
if (textRun is TextCharacters)
{
var textChars = (TextCharacters)textRun;
var result = new TextMetrics();
var props = textChars.Properties;
var typeface = props.Typeface;
var ideal_emsize = TextFormatterImp.RealToIdeal(props.FontRenderingEmSize);
result._textAscent = (int)Math.Round(typeface.Baseline(ideal_emsize, Constants.DefaultIdealToReal, props.PixelsPerDip, _textFormattingMode));
result._textHeight = (int)Math.Round(typeface.LineSpacing(ideal_emsize, Constants.DefaultIdealToReal, props.PixelsPerDip, _textFormattingMode));
result._height = result._textHeight;
result._baselineOffset = result._textAscent;
// width calculation
var formatted = GetFormattedTextSymbols(textChars, chars, 0); // isSideways
result._textWidth = formatted.UnscaledWidth;
return(result);
}
else if (textRun is TextHidden)
{
var result = new TextMetrics();
// Default should be empty
return(result);
}
else
{
throw new NotImplementedException(String.Format("Managed.TextFormatting.FullTextLine.GetRunMetrics for {0}", textRun.GetType().FullName));
}
}
/// <summary>
/// Get distance from the start of main text to the end of marker
/// </summary>
/// <remarks>
/// Positive distance is filtered out. Marker overlapping the main text is not supported.
/// </remarks>
internal int GetMainTextToMarkerIdealDistance()
{
if (_markerStore != null)
{
return(Math.Min(0, TextFormatterImp.RealToIdeal(_markerStore.Pap.TextMarkerProperties.Offset) - _store.Settings.TextIndent));
}
return(0);
}
public override void Draw(DrawingContext drawingContext, Point origin, InvertAxes inversion)
{
if (drawingContext == null)
{
throw new ArgumentNullException("drawingContext");
}
if ((_statusFlags & StatusFlags.IsDisposed) != 0)
{
throw new ObjectDisposedException(SR.Get(SRID.TextLineHasBeenDisposed));
}
MatrixTransform antiInversion = TextFormatterImp.CreateAntiInversionTransform(
inversion,
_metrics._formatter.IdealToReal(_paragraphWidth, PixelsPerDip),
_metrics._formatter.IdealToReal(_metrics._height, PixelsPerDip)
);
origin = AdjustOffset(origin);
if (antiInversion == null)
{
DrawTextLine(drawingContext, origin, null);
}
else
{
// Apply anti-inversion transform to correct the visual
drawingContext.PushTransform(antiInversion);
try
{
DrawTextLine(drawingContext, origin, antiInversion);
}
finally
{
drawingContext.Pop();
}
}
}
/// <summary>
/// Constructing paragraph properties
/// </summary>
/// <param name="formatter">Text formatter</param>
/// <param name="paragraphProperties">paragraph properties</param>
/// <param name="optimalBreak">produce optimal break</param>
internal ParaProp(
TextFormatterImp formatter,
TextParagraphProperties paragraphProperties,
bool optimalBreak
)
{
_paragraphProperties = paragraphProperties;
_emSize = TextFormatterImp.RealToIdeal(paragraphProperties.DefaultTextRunProperties.FontRenderingEmSize);
_indent = TextFormatterImp.RealToIdeal(paragraphProperties.Indent);
_paragraphIndent = TextFormatterImp.RealToIdeal(paragraphProperties.ParagraphIndent);
_height = TextFormatterImp.RealToIdeal(paragraphProperties.LineHeight);
if (_paragraphProperties.FlowDirection == FlowDirection.RightToLeft)
{
_statusFlags |= StatusFlags.Rtl;
}
if (optimalBreak)
{
_statusFlags |= StatusFlags.OptimalBreak;
}
}
/// <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;
}
}
}
}