public ShapedTextCharacters(ShapedBuffer shapedBuffer, TextRunProperties properties)
{
ShapedBuffer = shapedBuffer;
Text = shapedBuffer.Text;
Properties = properties;
TextSourceLength = Text.Length;
FontMetrics = new FontMetrics(properties.Typeface, properties.FontRenderingEmSize);
}
/// <summary>
/// Splits the <see cref="TextRun"/> at specified length.
/// </summary>
/// <param name="length">The length.</param>
/// <returns>The split result.</returns>
internal SplitResult <ShapedBuffer> Split(int length)
{
if (Text.Length == length)
{
return(new SplitResult <ShapedBuffer>(this, null));
}
var glyphCount = FindGlyphIndex(Text.Start + length);
var first = new ShapedBuffer(Text.Take(length), GlyphInfos.Take(glyphCount), GlyphTypeface, FontRenderingEmSize, BidiLevel);
var second = new ShapedBuffer(Text.Skip(length), GlyphInfos.Skip(glyphCount), GlyphTypeface, FontRenderingEmSize, BidiLevel);
return(new SplitResult <ShapedBuffer>(first, second));
}
/// <summary>
/// Creates an empty text line.
/// </summary>
/// <returns>The empty text line.</returns>
public static TextLineImpl CreateEmptyTextLine(int firstTextSourceIndex, double paragraphWidth, TextParagraphProperties paragraphProperties)
{
var flowDirection = paragraphProperties.FlowDirection;
var properties = paragraphProperties.DefaultTextRunProperties;
var glyphTypeface = properties.Typeface.GlyphTypeface;
var text = new ReadOnlySlice <char>(s_empty, firstTextSourceIndex, 1);
var glyph = glyphTypeface.GetGlyph(s_empty[0]);
var glyphInfos = new[] { new GlyphInfo(glyph, firstTextSourceIndex) };
var shapedBuffer = new ShapedBuffer(text, glyphInfos, glyphTypeface, properties.FontRenderingEmSize,
(sbyte)flowDirection);
var textRuns = new List <DrawableTextRun> {
new ShapedTextCharacters(shapedBuffer, properties)
};
return(new TextLineImpl(textRuns, firstTextSourceIndex, 0, paragraphWidth, paragraphProperties, flowDirection).FinalizeLine());
}
