public void Should_Format_TextRuns_With_TextRunStyles()
{
using (Start())
{
const string text = "0123456789";
var defaultStyle = new TextStyle(Typeface.Default, 12, Brushes.Black);
var textStyleRuns = new[]
{
new TextStyleRun(new TextPointer(0, 3), defaultStyle),
new TextStyleRun(new TextPointer(3, 3), new TextStyle(Typeface.Default, 13, Brushes.Black)),
new TextStyleRun(new TextPointer(6, 3), new TextStyle(Typeface.Default, 14, Brushes.Black)),
new TextStyleRun(new TextPointer(9, 1), defaultStyle)
};
var textSource = new FormattableTextSource(text, defaultStyle, textStyleRuns);
var formatter = new SimpleTextFormatter();
var textLine = formatter.FormatLine(textSource, 0, double.PositiveInfinity, new TextParagraphProperties());
Assert.Equal(text.Length, textLine.Text.Length);
for (var i = 0; i < textStyleRuns.Length; i++)
{
var textStyleRun = textStyleRuns[i];
var textRun = textLine.TextRuns[i];
Assert.Equal(textStyleRun.TextPointer.Length, textRun.Text.Length);
}
}
}
public void Should_Format_TextRuns_With_Default_Style()
{
using (Start())
{
const string text = "0123456789";
var defaultTextRunStyle = new TextStyle(Typeface.Default, 12, Brushes.Black);
var textSource = new SimpleTextSource(text, defaultTextRunStyle);
var formatter = new SimpleTextFormatter();
var textLine = formatter.FormatLine(textSource, 0, double.PositiveInfinity, new TextParagraphProperties());
Assert.Single(textLine.TextRuns);
var textRun = textLine.TextRuns[0];
Assert.Equal(defaultTextRunStyle.TextFormat, textRun.Style.TextFormat);
Assert.Equal(defaultTextRunStyle.Foreground, textRun.Style.Foreground);
Assert.Equal(text.Length, textRun.Text.Length);
}
}
public void Should_Wrap_Text(string text, string familyName, int numberOfCharactersPerLine)
{
using (Start())
{
var lineBreaker = new LineBreakEnumerator(text.AsMemory());
var expected = new List <int>();
while (lineBreaker.MoveNext())
{
expected.Add(lineBreaker.Current.PositionWrap - 1);
}
var typeface = new Typeface("resm:Avalonia.Skia.UnitTests.Assets?assembly=Avalonia.Skia.UnitTests#" +
familyName);
var defaultStyle = new TextStyle(typeface);
var textSource = new SimpleTextSource(text, defaultStyle);
var formatter = new SimpleTextFormatter();
var glyph = typeface.GlyphTypeface.GetGlyph('a');
var advance = typeface.GlyphTypeface.GetGlyphAdvance(glyph) *
(12.0 / typeface.GlyphTypeface.DesignEmHeight);
var paragraphWidth = advance * numberOfCharactersPerLine;
var currentPosition = 0;
while (currentPosition < text.Length)
{
var textLine =
formatter.FormatLine(textSource, currentPosition, paragraphWidth,
new TextParagraphProperties(defaultStyle, textWrapping: TextWrapping.Wrap));
Assert.True(expected.Contains(textLine.Text.End));
var index = expected.IndexOf(textLine.Text.End);
for (var i = 0; i <= index; i++)
{
expected.RemoveAt(0);
}
currentPosition += textLine.Text.Length;
}
}
}
public void Should_Produce_Unique_Runs(string text, int numberOfRuns)
{
using (Start())
{
var textSource = new SimpleTextSource(text, new TextStyle(Typeface.Default));
var formatter = new SimpleTextFormatter();
var textLine =
formatter.FormatLine(textSource, 0, double.PositiveInfinity, new TextParagraphProperties());
Assert.Equal(numberOfRuns, textLine.TextRuns.Count);
}
}
public void Should_Split_Run_On_Script()
{
using (Start())
{
const string text = "1234الدولي";
var textSource = new SimpleTextSource(text, new TextStyle(Typeface.Default));
var formatter = new SimpleTextFormatter();
var textLine =
formatter.FormatLine(textSource, 0, double.PositiveInfinity, new TextParagraphProperties());
Assert.Equal(4, textLine.TextRuns[0].Text.Length);
}
}
public void Should_Format_TextRuns_With_Multiple_Buffers()
{
using (Start())
{
var defaultTextRunStyle = new TextStyle(Typeface.Default, 12, Brushes.Black);
var textSource = new MultiBufferTextSource(defaultTextRunStyle);
var formatter = new SimpleTextFormatter();
var textLine = formatter.FormatLine(textSource, 0, double.PositiveInfinity,
new TextParagraphProperties(defaultTextRunStyle));
Assert.Equal(5, textLine.TextRuns.Count);
Assert.Equal(50, textLine.Text.Length);
}
}
public void Should_Get_CharacterHit_From_Distance()
{
using (Start())
{
var textSource = new MultiBufferTextSource(new TextStyle(Typeface.Default));
var formatter = new SimpleTextFormatter();
var textLine =
formatter.FormatLine(textSource, 0, double.PositiveInfinity, new TextParagraphProperties());
var currentDistance = 0.0;
CharacterHit characterHit;
foreach (var run in textLine.TextRuns)
{
var textRun = (ShapedTextRun)run;
var glyphRun = textRun.GlyphRun;
for (var i = 0; i < glyphRun.GlyphClusters.Length; i++)
{
var cluster = glyphRun.GlyphClusters[i];
var glyph = glyphRun.GlyphIndices[i];
var advance = glyphRun.GlyphTypeface.GetGlyphAdvance(glyph) * glyphRun.Scale;
characterHit = textLine.GetCharacterHitFromDistance(currentDistance);
Assert.Equal(cluster, characterHit.FirstCharacterIndex + characterHit.TrailingLength);
currentDistance += advance;
}
}
characterHit = textLine.GetCharacterHitFromDistance(textLine.LineMetrics.Size.Width);
Assert.Equal(textSource.TextPointer.End, characterHit.FirstCharacterIndex);
}
}
public void Should_Get_Distance_From_CharacterHit()
{
using (Start())
{
var textSource = new MultiBufferTextSource(new TextStyle(Typeface.Default));
var formatter = new SimpleTextFormatter();
var textLine =
formatter.FormatLine(textSource, 0, double.PositiveInfinity, new TextParagraphProperties());
var currentDistance = 0.0;
foreach (var run in textLine.TextRuns)
{
var textRun = (ShapedTextRun)run;
var glyphRun = textRun.GlyphRun;
for (var i = 0; i < glyphRun.GlyphClusters.Length; i++)
{
var cluster = glyphRun.GlyphClusters[i];
var glyph = glyphRun.GlyphIndices[i];
var advance = glyphRun.GlyphTypeface.GetGlyphAdvance(glyph) * glyphRun.Scale;
var distance = textLine.GetDistanceFromCharacterHit(new CharacterHit(cluster));
Assert.Equal(currentDistance, distance);
currentDistance += advance;
}
}
Assert.Equal(currentDistance, textLine.GetDistanceFromCharacterHit(new CharacterHit(textSource.TextPointer.Length)));
}
}