/// <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);
TextLineBreak previousLineBreak = null;
while (currentPosition < _text.Length && (MaxLines == 0 || textLines.Count < MaxLines))
{
var textLine = TextFormatter.Current.FormatLine(textSource, currentPosition, MaxWidth,
_paragraphProperties, previousLineBreak);
previousLineBreak = textLine.LineBreak;
textLines.Add(textLine);
UpdateBounds(textLine, ref width, ref height);
if (!double.IsPositiveInfinity(MaxHeight) && height > MaxHeight)
{
break;
}
currentPosition += textLine.TextRange.Length;
if (currentPosition != _text.Length || textLine.LineBreak == null)
{
continue;
}
var emptyTextLine = CreateEmptyTextLine(currentPosition);
textLines.Add(emptyTextLine);
}
Size = new Size(width, height);
TextLines = textLines;
}
}
/// <summary>
/// Updates the layout and applies specified text style overrides.
/// </summary>
private void UpdateLayout()
{
if (_text.IsEmpty || Math.Abs(MaxWidth) < double.Epsilon || Math.Abs(MaxHeight) < double.Epsilon)
{
var textLine = CreateEmptyTextLine(0);
TextLines = new List <TextLine> {
textLine
};
Bounds = new Rect(textLine.LineMetrics.BaselineOrigin.X, 0, 0, textLine.LineMetrics.Size.Height);
}
else
{
var textLines = new List <TextLine>();
double left = 0.0, right = 0.0, bottom = 0.0;
var lineBreaker = new LineBreakEnumerator(_text);
var currentPosition = 0;
while (currentPosition < _text.Length && (MaxLines == 0 || textLines.Count < MaxLines))
{
int length;
if (lineBreaker.MoveNext())
{
if (!lineBreaker.Current.Required)
{
continue;
}
length = lineBreaker.Current.PositionWrap - currentPosition;
if (currentPosition + length < _text.Length)
{
//The line breaker isn't treating \n\r as a pair so we have to fix that here.
if (_text[lineBreaker.Current.PositionMeasure] == '\n' &&
_text[lineBreaker.Current.PositionWrap] == '\r')
{
length++;
}
}
}
else
{
length = _text.Length - currentPosition;
}
var remainingLength = length;
while (remainingLength > 0 && (MaxLines == 0 || textLines.Count < MaxLines))
{
var textSlice = _text.AsSlice(currentPosition, remainingLength);
var textSource = new FormattedTextSource(textSlice, _paragraphProperties.DefaultTextStyle, _textStyleOverrides);
var textLine = TextFormatter.Current.FormatLine(textSource, 0, MaxWidth, _paragraphProperties);
UpdateBounds(textLine, ref left, ref right, ref bottom);
textLines.Add(textLine);
if (!double.IsPositiveInfinity(MaxHeight) && bottom + textLine.LineMetrics.Size.Height > MaxHeight)
{
currentPosition = _text.Length;
break;
}
if (_paragraphProperties.TextTrimming != TextTrimming.None)
{
currentPosition += remainingLength;
break;
}
remainingLength -= textLine.Text.Length;
currentPosition += textLine.Text.Length;
}
}
if (lineBreaker.Current.Required && currentPosition == _text.Length)
{
var emptyTextLine = CreateEmptyTextLine(currentPosition);
UpdateBounds(emptyTextLine, ref left, ref right, ref bottom);
textLines.Add(emptyTextLine);
}
Bounds = new Rect(left, 0, right, bottom);
TextLines = textLines;
}
}
/// <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?.TextLineBreak);
currentPosition += textLine.TextRange.Length;
if (textLines.Count > 0)
{
if (textLines.Count == MaxLines || !double.IsPositiveInfinity(MaxHeight) &&
height + textLine.LineMetrics.Size.Height > MaxHeight)
{
if (previousLine?.TextLineBreak != 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.TextLineBreak == null)
{
continue;
}
var emptyTextLine = CreateEmptyTextLine(currentPosition);
textLines.Add(emptyTextLine);
}
Size = new Size(width, height);
TextLines = textLines;
}
}
