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);
}
