public override IReadOnlyList <TextRun>?Collapse(TextLine textLine)
{
return(TextEllipsisHelper.Collapse(textLine, this, false));
}
public override void Justify(TextLine textLine)
{
var paragraphWidth = Width;
if (double.IsInfinity(paragraphWidth))
{
return;
}
if (textLine.NewLineLength > 0)
{
return;
}
var textLineBreak = textLine.TextLineBreak;
if (textLineBreak is not null && textLineBreak.TextEndOfLine is not null)
{
if (textLineBreak.RemainingRuns is null || textLineBreak.RemainingRuns.Count == 0)
{
return;
}
}
var breakOportunities = new Queue <int>();
foreach (var textRun in textLine.TextRuns)
{
var text = textRun.Text;
if (text.IsEmpty)
{
continue;
}
var start = text.Start;
var lineBreakEnumerator = new LineBreakEnumerator(text);
while (lineBreakEnumerator.MoveNext())
{
var currentBreak = lineBreakEnumerator.Current;
if (!currentBreak.Required && currentBreak.PositionWrap != text.Length)
{
breakOportunities.Enqueue(start + currentBreak.PositionMeasure);
}
}
}
if (breakOportunities.Count == 0)
{
return;
}
var remainingSpace = Math.Max(0, paragraphWidth - textLine.WidthIncludingTrailingWhitespace);
var spacing = remainingSpace / breakOportunities.Count;
foreach (var textRun in textLine.TextRuns)
{
var text = textRun.Text;
if (text.IsEmpty)
{
continue;
}
if (textRun is ShapedTextCharacters shapedText)
{
var glyphRun = shapedText.GlyphRun;
var shapedBuffer = shapedText.ShapedBuffer;
var currentPosition = text.Start;
while (breakOportunities.Count > 0)
{
var characterIndex = breakOportunities.Dequeue();
if (characterIndex < currentPosition)
{
continue;
}
var glyphIndex = glyphRun.FindGlyphIndex(characterIndex);
var glyphInfo = shapedBuffer.GlyphInfos[glyphIndex];
shapedBuffer.GlyphInfos[glyphIndex] = new GlyphInfo(glyphInfo.GlyphIndex, glyphInfo.GlyphCluster, glyphInfo.GlyphAdvance + spacing);
}
glyphRun.GlyphAdvances = shapedBuffer.GlyphAdvances;
}
}
}
public override List <DrawableTextRun>?Collapse(TextLine textLine)
{
return(TextEllipsisHelper.Collapse(textLine, this, true));
}
/// <summary>
/// Updates the layout and applies specified text style overrides.
/// </summary>
private void UpdateLayout()
{
if (_text.IsEmpty || MathUtilities.IsZero(MaxWidth) || MathUtilities.IsZero(MaxHeight))
{
var textLine = CreateEmptyTextLine(0);
TextLines = new List <TextLine> {
textLine
};
Size = new Size(0, textLine.LineMetrics.Size.Height);
}
else
{
var textLines = new List <TextLine>();
double width = 0.0, height = 0.0;
var currentPosition = 0;
var textSource = new FormattedTextSource(_text,
_paragraphProperties.DefaultTextRunProperties, _textStyleOverrides);
TextLine previousLine = null;
while (currentPosition < _text.Length)
{
var textLine = TextFormatter.Current.FormatLine(textSource, currentPosition, MaxWidth,
_paragraphProperties, previousLine?.LineBreak);
currentPosition += textLine.TextRange.Length;
if (textLines.Count > 0)
{
if (textLines.Count == MaxLines || !double.IsPositiveInfinity(MaxHeight) &&
height + textLine.LineMetrics.Size.Height > MaxHeight)
{
if (previousLine?.LineBreak != null && _textTrimming != TextTrimming.None)
{
var collapsedLine =
previousLine.Collapse(GetCollapsingProperties(MaxWidth));
textLines[textLines.Count - 1] = collapsedLine;
}
break;
}
}
var hasOverflowed = textLine.LineMetrics.HasOverflowed;
if (hasOverflowed && _textTrimming != TextTrimming.None)
{
textLine = textLine.Collapse(GetCollapsingProperties(MaxWidth));
}
textLines.Add(textLine);
UpdateBounds(textLine, ref width, ref height);
previousLine = textLine;
if (currentPosition != _text.Length || textLine.LineBreak == null)
{
continue;
}
var emptyTextLine = CreateEmptyTextLine(currentPosition);
textLines.Add(emptyTextLine);
}
Size = new Size(width, height);
TextLines = textLines;
}
}
/// <summary> /// Collapses given text line. /// </summary> /// <param name="textLine">Text line to collapse.</param> public abstract IReadOnlyList <TextRun>?Collapse(TextLine textLine);
