public void Wrap_Should_Not_Produce_Empty_Lines()
{
using (Start())
{
const string text = "012345";
var defaultProperties = new GenericTextRunProperties(Typeface.Default);
var paragraphProperties = new GenericTextParagraphProperties(defaultProperties, textWrap: TextWrapping.Wrap);
var textSource = new SingleBufferTextSource(text, defaultProperties);
var formatter = new TextFormatterImpl();
var textSourceIndex = 0;
while (textSourceIndex < text.Length)
{
var textLine =
formatter.FormatLine(textSource, textSourceIndex, 3, paragraphProperties);
Assert.NotEqual(0, textLine.TextRange.Length);
textSourceIndex += textLine.TextRange.Length;
}
Assert.Equal(text.Length, textSourceIndex);
}
}
public void Should_Wrap_Syriac()
{
using (Start())
{
const string text =
"܀ ܁ ܂ ܃ ܄ ܅ ܆ ܇ ܈ ܉ ܊ ܋ ܌ ܍ ܐ ܑ ܒ ܓ ܔ ܕ ܖ ܗ ܘ ܙ ܚ ܛ ܜ ܝ ܞ ܟ ܠ ܡ ܢ ܣ ܤ ܥ ܦ ܧ ܨ ܩ ܪ ܫ ܬ ܰ ܱ ܲ ܳ ܴ ܵ ܶ ܷ ܸ ܹ ܺ ܻ ܼ ܽ ܾ ܿ ݀ ݁ ݂ ݃ ݄ ݅ ݆ ݇ ݈ ݉ ݊";
var defaultProperties = new GenericTextRunProperties(Typeface.Default);
var paragraphProperties =
new GenericTextParagraphProperties(defaultProperties, textWrap: TextWrapping.Wrap);
var textSource = new SingleBufferTextSource(text, defaultProperties);
var formatter = new TextFormatterImpl();
var textPosition = 87;
TextLineBreak lastBreak = null;
while (textPosition < text.Length)
{
var textLine =
formatter.FormatLine(textSource, textPosition, 50, paragraphProperties, lastBreak);
Assert.Equal(textLine.Length, textLine.TextRuns.Sum(x => x.TextSourceLength));
textPosition += textLine.Length;
lastBreak = textLine.TextLineBreak;
}
}
}
public void Should_Not_Produce_TextLine_Wider_Than_ParagraphWidth()
{
using (Start())
{
const string text =
"Multiline TextBlock with TextWrapping.\r\rLorem ipsum dolor sit amet, consectetur adipiscing elit. " +
"Vivamus magna. Cras in mi at felis aliquet congue. Ut a est eget ligula molestie gravida. Curabitur massa. " +
"Donec eleifend, libero at sagittis mollis, tellus est malesuada tellus, at luctus turpis elit sit amet quam. " +
"Vivamus pretium ornare est.";
var defaultProperties = new GenericTextRunProperties(Typeface.Default);
var paragraphProperties = new GenericTextParagraphProperties(defaultProperties, textWrap: TextWrapping.Wrap);
var textSource = new SingleBufferTextSource(text, defaultProperties);
var formatter = new TextFormatterImpl();
var textSourceIndex = 0;
while (textSourceIndex < text.Length)
{
var textLine =
formatter.FormatLine(textSource, textSourceIndex, 200, paragraphProperties);
Assert.True(textLine.Width <= 200);
textSourceIndex += textLine.TextRange.Length;
}
}
}
public void Should_Align_TextLine(string text, TextAlignment textAlignment, FlowDirection flowDirection)
{
using (Start())
{
var defaultProperties = new GenericTextRunProperties(Typeface.Default);
var paragraphProperties = new GenericTextParagraphProperties(flowDirection, textAlignment, true, true,
defaultProperties, TextWrapping.NoWrap, 0, 0);
var textSource = new SingleBufferTextSource(text, defaultProperties);
var formatter = new TextFormatterImpl();
var textLine =
formatter.FormatLine(textSource, 0, 100, paragraphProperties);
var expectedOffset = 0d;
switch (textAlignment)
{
case TextAlignment.Center:
expectedOffset = 50 - textLine.Width / 2;
break;
case TextAlignment.Right:
expectedOffset = 100 - textLine.WidthIncludingTrailingWhitespace;
break;
}
Assert.Equal(expectedOffset, textLine.Start);
}
}
public void Should_FormatLine_With_Emergency_Breaks()
{
using (Start())
{
var defaultProperties = new GenericTextRunProperties(Typeface.Default);
var paragraphProperties = new GenericTextParagraphProperties(defaultProperties, textWrap: TextWrapping.Wrap);
var textSource = new SingleBufferTextSource("0123456789_0123456789_0123456789_0123456789", defaultProperties);
var formatter = new TextFormatterImpl();
var textLine =
formatter.FormatLine(textSource, 0, 33, paragraphProperties);
Assert.NotNull(textLine.TextLineBreak?.RemainingCharacters);
}
}
public void Should_Format_With_EndOfLineRun()
{
using (Start())
{
var defaultRunProperties = new GenericTextRunProperties(Typeface.Default);
var paragraphProperties = new GenericTextParagraphProperties(defaultRunProperties);
var textSource = new EndOfLineTextSource();
var textLine =
TextFormatter.Current.FormatLine(textSource, 0, double.PositiveInfinity, paragraphProperties);
Assert.NotNull(textLine.TextLineBreak);
Assert.Equal(TextRun.DefaultTextSourceLength, textLine.Length);
}
}
public void Should_FormatLine_With_DrawableRuns()
{
var defaultRunProperties = new GenericTextRunProperties(Typeface.Default, foregroundBrush: Brushes.Black);
var paragraphProperties = new GenericTextParagraphProperties(defaultRunProperties);
var textSource = new CustomTextSource("Hello World ->");
using (Start())
{
var textLine =
TextFormatter.Current.FormatLine(textSource, 0, double.PositiveInfinity, paragraphProperties);
Assert.Equal(3, textLine.TextRuns.Count);
Assert.True(textLine.TextRuns[1] is RectangleRun);
}
}
public void Should_Align_TextLine(TextAlignment textAlignment)
{
using (Start())
{
var defaultProperties = new GenericTextRunProperties(Typeface.Default);
var paragraphProperties = new GenericTextParagraphProperties(defaultProperties, textAlignment);
var textSource = new SingleBufferTextSource("0123456789", defaultProperties);
var formatter = new TextFormatterImpl();
var textLine =
formatter.FormatLine(textSource, 0, 100, paragraphProperties);
var expectedOffset = TextLine.GetParagraphOffsetX(textLine.Width, 100, textAlignment);
Assert.Equal(expectedOffset, textLine.Start);
}
}
public void Should_Not_Alter_TextRuns_After_TextStyles_Were_Applied(string text)
{
using (Start())
{
var formatter = new TextFormatterImpl();
var defaultProperties = new GenericTextRunProperties(Typeface.Default);
var paragraphProperties =
new GenericTextParagraphProperties(defaultProperties, textWrap: TextWrapping.NoWrap);
var foreground = new SolidColorBrush(Colors.Red).ToImmutable();
var expectedTextLine = formatter.FormatLine(new SingleBufferTextSource(text, defaultProperties),
0, double.PositiveInfinity, paragraphProperties);
var expectedRuns = expectedTextLine.TextRuns.Cast <ShapedTextCharacters>().ToList();
var expectedGlyphs = expectedRuns.SelectMany(x => x.GlyphRun.GlyphIndices).ToList();
for (var i = 0; i < text.Length; i++)
{
for (var j = 1; i + j < text.Length; j++)
{
var spans = new[]
{
new ValueSpan <TextRunProperties>(i, j,
new GenericTextRunProperties(Typeface.Default, 12, foregroundBrush: foreground))
};
var textSource = new FormattedTextSource(text.AsMemory(), defaultProperties, spans);
var textLine =
formatter.FormatLine(textSource, 0, double.PositiveInfinity, paragraphProperties);
var shapedRuns = textLine.TextRuns.Cast <ShapedTextCharacters>().ToList();
var actualGlyphs = shapedRuns.SelectMany(x => x.GlyphRun.GlyphIndices).ToList();
Assert.Equal(expectedGlyphs, actualGlyphs);
}
}
}
}
protected override Size MeasureOverride(Size availableSize)
{
var defaultRunProperties = new GenericTextRunProperties(Typeface.Default, foregroundBrush: Brushes.Black,
baselineAlignment: BaselineAlignment.Center);
var paragraphProperties = new GenericTextParagraphProperties(defaultRunProperties);
var control = new Button {
Content = new TextBlock {
Text = "ClickMe"
}
};
Content = control;
var textSource = new CustomTextSource(control, defaultRunProperties);
control.Measure(Size.Infinity);
_textLine =
TextFormatter.Current.FormatLine(textSource, 0, double.PositiveInfinity, paragraphProperties);
return(base.MeasureOverride(availableSize));
}
