public static List <ShapedTextCharacters>?Collapse(TextLine textLine, TextCollapsingProperties properties, bool isWordEllipsis) { var shapedTextRuns = textLine.TextRuns as List <ShapedTextCharacters>; if (shapedTextRuns is null) { return(null); } var runIndex = 0; var currentWidth = 0.0; var collapsedLength = 0; var textRange = textLine.TextRange; var shapedSymbol = TextFormatterImpl.CreateSymbol(properties.Symbol, FlowDirection.LeftToRight); if (properties.Width < shapedSymbol.GlyphRun.Size.Width) { return(new List <ShapedTextCharacters>(0)); } var availableWidth = properties.Width - shapedSymbol.Size.Width; while (runIndex < shapedTextRuns.Count) { var currentRun = shapedTextRuns[runIndex]; currentWidth += currentRun.Size.Width; if (currentWidth > availableWidth) { if (currentRun.TryMeasureCharacters(availableWidth, out var measuredLength)) { if (isWordEllipsis && measuredLength < textRange.End) { var currentBreakPosition = 0; var lineBreaker = new LineBreakEnumerator(currentRun.Text); while (currentBreakPosition < measuredLength && lineBreaker.MoveNext()) { var nextBreakPosition = lineBreaker.Current.PositionMeasure; if (nextBreakPosition == 0) { break; } if (nextBreakPosition >= measuredLength) { break; } currentBreakPosition = nextBreakPosition; } measuredLength = currentBreakPosition; } } collapsedLength += measuredLength; var shapedTextCharacters = new List <ShapedTextCharacters>(shapedTextRuns.Count); if (collapsedLength > 0) { var splitResult = TextFormatterImpl.SplitShapedRuns(shapedTextRuns, collapsedLength); shapedTextCharacters.AddRange(splitResult.First); TextLineImpl.SortRuns(shapedTextCharacters); } shapedTextCharacters.Add(shapedSymbol); return(shapedTextCharacters); } availableWidth -= currentRun.Size.Width; collapsedLength += currentRun.GlyphRun.Characters.Length; runIndex++; } return(null); }
public static List <DrawableTextRun>?Collapse(TextLine textLine, TextCollapsingProperties properties, bool isWordEllipsis) { if (textLine.TextRuns is not List <DrawableTextRun> textRuns || textRuns.Count == 0) { return(null); } var runIndex = 0; var currentWidth = 0.0; var collapsedLength = 0; var shapedSymbol = TextFormatterImpl.CreateSymbol(properties.Symbol, FlowDirection.LeftToRight); if (properties.Width < shapedSymbol.GlyphRun.Size.Width) { //Not enough space to fit in the symbol return(new List <DrawableTextRun>(0)); } var availableWidth = properties.Width - shapedSymbol.Size.Width; while (runIndex < textRuns.Count) { var currentRun = textRuns[runIndex]; switch (currentRun) { case ShapedTextCharacters shapedRun: { currentWidth += shapedRun.Size.Width; if (currentWidth > availableWidth) { if (shapedRun.TryMeasureCharacters(availableWidth, out var measuredLength)) { if (isWordEllipsis && measuredLength < textLine.Length) { var currentBreakPosition = 0; var lineBreaker = new LineBreakEnumerator(currentRun.Text); while (currentBreakPosition < measuredLength && lineBreaker.MoveNext()) { var nextBreakPosition = lineBreaker.Current.PositionMeasure; if (nextBreakPosition == 0) { break; } if (nextBreakPosition >= measuredLength) { break; } currentBreakPosition = nextBreakPosition; } measuredLength = currentBreakPosition; } } collapsedLength += measuredLength; var collapsedRuns = new List <DrawableTextRun>(textRuns.Count); if (collapsedLength > 0) { var splitResult = TextFormatterImpl.SplitDrawableRuns(textRuns, collapsedLength); collapsedRuns.AddRange(splitResult.First); } collapsedRuns.Add(shapedSymbol); return(collapsedRuns); } availableWidth -= currentRun.Size.Width; break; } case { } drawableRun: { //The whole run needs to fit into available space if (currentWidth + drawableRun.Size.Width > availableWidth) { var collapsedRuns = new List <DrawableTextRun>(textRuns.Count); if (collapsedLength > 0) { var splitResult = TextFormatterImpl.SplitDrawableRuns(textRuns, collapsedLength); collapsedRuns.AddRange(splitResult.First); } collapsedRuns.Add(shapedSymbol); return(collapsedRuns); } break; } } collapsedLength += currentRun.TextSourceLength; runIndex++; } return(null); }