private static CultureInfo GetNumberCulture(TextRunProperties properties, out NumberSubstitutionMethod method, out bool ignoreUserOverride) { ignoreUserOverride = true; NumberSubstitution sub = properties.NumberSubstitution; if (sub == null) { method = NumberSubstitutionMethod.AsCulture; return(CultureMapper.GetSpecificCulture(properties.CultureInfo)); } method = sub.Substitution; switch (sub.CultureSource) { case NumberCultureSource.Text: return(CultureMapper.GetSpecificCulture(properties.CultureInfo)); case NumberCultureSource.User: ignoreUserOverride = false; return(CultureInfo.CurrentCulture); case NumberCultureSource.Override: return(sub.CultureOverride); } return(null); }
/// <summary> /// TextFormatter to get text immediately before specified text source position. /// </summary> public override TextSpan <CultureSpecificCharacterBufferRange> GetPrecedingText( int textSourceCharacterIndexLimit ) { CharacterBufferRange charString = CharacterBufferRange.Empty; if (textSourceCharacterIndexLimit > 0) { charString = new CharacterBufferRange( new CharacterBufferReference(_characterArray, 0), Math.Min(_characterArray.Length, textSourceCharacterIndexLimit) ); } return(new TextSpan <CultureSpecificCharacterBufferRange> ( textSourceCharacterIndexLimit, new CultureSpecificCharacterBufferRange(CultureMapper.GetSpecificCulture(_textRunProperties.CultureInfo), charString) )); }
/// <summary> /// Get text immediately preceding cpLimit. /// </summary> internal TextSpan <CultureSpecificCharacterBufferRange> GetPrecedingText(TextSource textSource, int cpLimit) { if (cpLimit > 0) { SpanRider textRunSpanRider = new SpanRider(_textRunVector, _latestPosition); if (textRunSpanRider.At(cpLimit - 1)) { CharacterBufferRange charString = CharacterBufferRange.Empty; CultureInfo culture = null; TextRun run = textRunSpanRider.CurrentElement as TextRun; if (run != null) { // Only TextRun containing text would have non-empty Character buffer range. if (TextRunInfo.GetRunType(run) == Plsrun.Text && run.CharacterBufferReference.CharacterBuffer != null) { charString = new CharacterBufferRange( run.CharacterBufferReference, cpLimit - textRunSpanRider.CurrentSpanStart); culture = CultureMapper.GetSpecificCulture(run.Properties.CultureInfo); } return(new TextSpan <CultureSpecificCharacterBufferRange>( cpLimit - textRunSpanRider.CurrentSpanStart, // cp length new CultureSpecificCharacterBufferRange(culture, charString) )); } } } // not in cache so call back to client return(textSource.GetPrecedingText(cpLimit)); }
internal TextMarkerSource( TextParagraphProperties textParagraphProperties, TextMarkerStyle markerStyle, int autoNumberingIndex ) { Debug.Assert(markerStyle != TextMarkerStyle.None); _textParagraphProperties = textParagraphProperties; TextRunProperties defaultRunProperties = _textParagraphProperties.DefaultTextRunProperties; PixelsPerDip = defaultRunProperties.PixelsPerDip; string symbolString = null; if (IsKnownSymbolMarkerStyle(markerStyle)) { switch (markerStyle) { case TextMarkerStyle.Disc: symbolString = "\x9f"; break; case TextMarkerStyle.Circle: symbolString = "\xa1"; break; case TextMarkerStyle.Square: symbolString = "\x71"; break; case TextMarkerStyle.Box: symbolString = "\xa7"; break; } Typeface defaultTypeface = defaultRunProperties.Typeface; // recreate a new marker run properties based on symbol typeface e.g. Wingding _textRunProperties = new GenericTextRunProperties( new Typeface( new FontFamily("Wingdings"), defaultTypeface.Style, defaultTypeface.Weight, defaultTypeface.Stretch ), defaultRunProperties.FontRenderingEmSize, defaultRunProperties.FontHintingEmSize, PixelsPerDip, defaultRunProperties.TextDecorations, defaultRunProperties.ForegroundBrush, defaultRunProperties.BackgroundBrush, defaultRunProperties.BaselineAlignment, CultureMapper.GetSpecificCulture(defaultRunProperties.CultureInfo), null // default number substitution for culture ); } else if (IsKnownIndexMarkerStyle(markerStyle)) { // Internal client code should have already validated this. Debug.Assert(autoNumberingIndex > 0); _textRunProperties = defaultRunProperties; int counter = autoNumberingIndex; switch (markerStyle) { case TextMarkerStyle.Decimal: _characterArray = ConvertNumberToString(counter, false, DecimalNumerics); break; case TextMarkerStyle.LowerLatin: _characterArray = ConvertNumberToString(counter, true, LowerLatinNumerics); break; case TextMarkerStyle.UpperLatin: _characterArray = ConvertNumberToString(counter, true, UpperLatinNumerics); break; case TextMarkerStyle.LowerRoman: symbolString = ConvertNumberToRomanString(counter, false); break; case TextMarkerStyle.UpperRoman: symbolString = ConvertNumberToRomanString(counter, true); break; } } else { Debug.Assert(false, "Invalid marker style"); } if (symbolString != null) { _characterArray = symbolString.ToCharArray(); } Debug.Assert(_characterArray != null); }
/// <summary> /// Fetch cached textrun /// </summary> internal TextRun FetchTextRun( FormatSettings settings, int cpFetch, int cpFirst, out int offsetToFirstCp, out int runLength ) { SpanRider textRunSpanRider = new SpanRider(_textRunVector, _latestPosition, cpFetch); _latestPosition = textRunSpanRider.SpanPosition; TextRun textRun = (TextRun)textRunSpanRider.CurrentElement; if (textRun == null) { // run not already cached, fetch new run and cache it textRun = settings.TextSource.GetTextRun(cpFetch); if (textRun.Length < 1) { throw new ArgumentOutOfRangeException("textRun.Length", SR.Get(SRID.ParameterMustBeGreaterThanZero)); } Plsrun plsrun = TextRunInfo.GetRunType(textRun); if (plsrun == Plsrun.Text || plsrun == Plsrun.InlineObject) { TextRunProperties properties = textRun.Properties; if (properties == null) { throw new ArgumentException(SR.Get(SRID.TextRunPropertiesCannotBeNull)); } if (properties.FontRenderingEmSize <= 0) { throw new ArgumentException(SR.Get(SRID.PropertyOfClassMustBeGreaterThanZero, "FontRenderingEmSize", "TextRunProperties")); } double realMaxFontRenderingEmSize = Constants.RealInfiniteWidth / Constants.GreatestMutiplierOfEm; if (properties.FontRenderingEmSize > realMaxFontRenderingEmSize) { throw new ArgumentException(SR.Get(SRID.PropertyOfClassCannotBeGreaterThan, "FontRenderingEmSize", "TextRunProperties", realMaxFontRenderingEmSize)); } CultureInfo culture = CultureMapper.GetSpecificCulture(properties.CultureInfo); if (culture == null) { throw new ArgumentException(SR.Get(SRID.PropertyOfClassCannotBeNull, "CultureInfo", "TextRunProperties")); } if (properties.Typeface == null) { throw new ArgumentException(SR.Get(SRID.PropertyOfClassCannotBeNull, "Typeface", "TextRunProperties")); } } // // TextRun is specifial to SpanVector because TextRun also encodes position which needs to be // consistent with the positions encoded by SpanVector. In run cache, the begining of a span // should always correspond to the begining of a cached text run. If the end of the currently fetched // run overlaps with the begining of an already cached run, the begining of the cached run needs to be // adjusted as well as its span. Because we can't gurantee the correctness of the overlapped range // so we'll simply remove the overlapped runs here. // // Move the rider to the end of the current run textRunSpanRider.At(cpFetch + textRun.Length - 1); _latestPosition = textRunSpanRider.SpanPosition; if (textRunSpanRider.CurrentElement != _textRunVector.Default) { // The end overlaps with one or more cached runs, clear the range from the // begining of the current fetched run to the end of the last overlapped cached run. _latestPosition = _textRunVector.SetReference( cpFetch, textRunSpanRider.CurrentPosition + textRunSpanRider.Length - cpFetch, _textRunVector.Default, _latestPosition ); } _latestPosition = _textRunVector.SetReference(cpFetch, textRun.Length, textRun, _latestPosition); // Refresh the rider's SpanPosition following previous SpanVector.SetReference calls textRunSpanRider.At(_latestPosition, cpFetch); } // If the TextRun was obtained from the cache, make sure it has the right PixelsPerDip set on its properties. if (textRun.Properties != null) { textRun.Properties.PixelsPerDip = settings.TextSource.PixelsPerDip; } offsetToFirstCp = textRunSpanRider.CurrentPosition - textRunSpanRider.CurrentSpanStart; runLength = textRunSpanRider.Length; Debug.Assert(textRun != null && runLength > 0, "Invalid run!"); bool isText = textRun is ITextSymbols; if (isText) { // Chop text run to optimal length so we dont spend forever analysing // them all at once. int looseCharLength = TextStore.TypicalCharactersPerLine - cpFetch + cpFirst; if (looseCharLength <= 0) { // this line already exceeds typical line length, incremental fetch goes // about a quarter of the typical length. looseCharLength = (int)Math.Round(TextStore.TypicalCharactersPerLine * 0.25); } if (runLength > looseCharLength) { if (TextRunInfo.GetRunType(textRun) == Plsrun.Text) { // // When chopping the run at the typical line length, // - don't chop in between of higher & lower surrogate // - don't chop combining mark away from its base character // - don't chop joiner from surrounding characters // // Starting from the initial chopping point, we look ahead to find a safe position. We stop at // a limit in case the run consists of many combining mark & joiner. That is rare and doesn't make // much sense in shaping already. // CharacterBufferReference charBufferRef = textRun.CharacterBufferReference; // We look ahead by one more line at most. It is not normal to have // so many combining mark or joiner characters in a row. It doesn't make sense to // look further if so. int lookAheadLimit = Math.Min(runLength, looseCharLength + TextStore.TypicalCharactersPerLine); int sizeOfChar = 0; int endOffset = 0; bool canBreakAfterPrecedingChar = false; for (endOffset = looseCharLength - 1; endOffset < lookAheadLimit; endOffset += sizeOfChar) { CharacterBufferRange charString = new CharacterBufferRange( charBufferRef.CharacterBuffer, charBufferRef.OffsetToFirstChar + offsetToFirstCp + endOffset, runLength - endOffset ); int ch = Classification.UnicodeScalar(charString, out sizeOfChar); // We can only safely break if the preceding char is not a joiner character (i.e. can-break-after), // and the current char is not combining or joiner (i.e. can-break-before). if (canBreakAfterPrecedingChar && !Classification.IsCombining(ch) && !Classification.IsJoiner(ch)) { break; } canBreakAfterPrecedingChar = !Classification.IsJoiner(ch); } looseCharLength = Math.Min(runLength, endOffset); } runLength = looseCharLength; } } Debug.Assert( // valid run found runLength > 0 // non-text run always fetched at run start && (isText || textRunSpanRider.CurrentSpanStart - textRunSpanRider.CurrentPosition == 0) // span rider of both text and format point to valid position && (textRunSpanRider.Length > 0 && textRunSpanRider.CurrentElement != null), "Text run fetching error!" ); return(textRun); }