public override IReadOnlyList <TextRun>?Collapse(TextLine textLine)
{
var shapedTextRuns = textLine.TextRuns as List <ShapedTextCharacters>;
if (shapedTextRuns is null)
{
return(null);
}
var runIndex = 0;
var currentWidth = 0.0;
var shapedSymbol = TextFormatterImpl.CreateSymbol(Symbol, FlowDirection.LeftToRight);
if (Width < shapedSymbol.GlyphRun.Size.Width)
{
return(new List <ShapedTextCharacters>(0));
}
// Overview of ellipsis structure
// Prefix length run | Ellipsis symbol | Post split run growing from the end |
var availableWidth = Width - shapedSymbol.Size.Width;
while (runIndex < shapedTextRuns.Count)
{
var currentRun = shapedTextRuns[runIndex];
currentWidth += currentRun.Size.Width;
if (currentWidth > availableWidth)
{
currentRun.TryMeasureCharacters(availableWidth, out var measuredLength);
var shapedTextCharacters = new List <ShapedTextCharacters>(shapedTextRuns.Count);
if (measuredLength > 0)
{
List <ShapedTextCharacters>?preSplitRuns = null;
List <ShapedTextCharacters>?postSplitRuns = null;
if (_prefixLength > 0)
{
var splitResult = TextFormatterImpl.SplitShapedRuns(shapedTextRuns, Math.Min(_prefixLength, measuredLength));
shapedTextCharacters.AddRange(splitResult.First);
TextLineImpl.SortRuns(shapedTextCharacters);
preSplitRuns = splitResult.First;
postSplitRuns = splitResult.Second;
}
else
{
postSplitRuns = shapedTextRuns;
}
shapedTextCharacters.Add(shapedSymbol);
if (measuredLength > _prefixLength && postSplitRuns is not null)
{
var availableSuffixWidth = availableWidth;
if (preSplitRuns is not null)
{
foreach (var run in preSplitRuns)
{
availableSuffixWidth -= run.Size.Width;
}
}
for (int i = postSplitRuns.Count - 1; i >= 0; i--)
{
var run = postSplitRuns[i];
if (run.TryMeasureCharactersBackwards(availableSuffixWidth, out int suffixCount, out double suffixWidth))
{
availableSuffixWidth -= suffixWidth;
if (suffixCount > 0)
{
var splitSuffix = run.Split(run.TextSourceLength - suffixCount);
shapedTextCharacters.Add(splitSuffix.Second !);
}
}
}
}
}
else
{
shapedTextCharacters.Add(shapedSymbol);
}
return(shapedTextCharacters);
}
availableWidth -= currentRun.Size.Width;
runIndex++;
}
return(null);
}
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);
}
/// <inheritdoc/>
public override TextLine Collapse(params TextCollapsingProperties[] collapsingPropertiesList)
{
if (collapsingPropertiesList.Length == 0)
{
return(this);
}
var collapsingProperties = collapsingPropertiesList[0];
var runIndex = 0;
var currentWidth = 0.0;
var textRange = TextRange;
var collapsedLength = 0;
var shapedSymbol = TextFormatterImpl.CreateSymbol(collapsingProperties.Symbol, _paragraphProperties.FlowDirection);
var availableWidth = collapsingProperties.Width - shapedSymbol.GlyphRun.Size.Width;
while (runIndex < _textRuns.Count)
{
var currentRun = _textRuns[runIndex];
currentWidth += currentRun.Size.Width;
if (currentWidth > availableWidth)
{
if (currentRun.TryMeasureCharacters(availableWidth, out var measuredLength))
{
if (collapsingProperties.Style == TextCollapsingStyle.TrailingWord &&
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 splitResult = TextFormatterImpl.SplitShapedRuns(_textRuns, collapsedLength);
var shapedTextCharacters = new List <ShapedTextCharacters>(splitResult.First.Count + 1);
shapedTextCharacters.AddRange(splitResult.First);
SortRuns(shapedTextCharacters);
shapedTextCharacters.Add(shapedSymbol);
textRange = new TextRange(textRange.Start, collapsedLength);
var textLine = new TextLineImpl(shapedTextCharacters, textRange, _paragraphWidth, _paragraphProperties,
_flowDirection, TextLineBreak, true);
return(textLine.FinalizeLine());
}
availableWidth -= currentRun.Size.Width;
collapsedLength += currentRun.GlyphRun.Characters.Length;
runIndex++;
}
return(this);
}
