private static double GetBaselineOffset(TextLine textLine, DrawableTextRun textRun)
{
var baseline = textRun.Baseline;
var baselineAlignment = textRun.Properties?.BaselineAlignment;
switch (baselineAlignment)
{
case BaselineAlignment.Top:
return(0);
case BaselineAlignment.Center:
return(textLine.Height / 2 - textRun.Size.Height / 2);
case BaselineAlignment.Bottom:
return(textLine.Height - textRun.Size.Height);
case BaselineAlignment.Baseline:
case BaselineAlignment.TextTop:
case BaselineAlignment.TextBottom:
case BaselineAlignment.Subscript:
case BaselineAlignment.Superscript:
return(textLine.Baseline - baseline);
default:
throw new ArgumentOutOfRangeException(nameof(baselineAlignment), baselineAlignment, null);
}
}
private static sbyte GetRunBidiLevel(DrawableTextRun run, FlowDirection flowDirection)
{
if (run is ShapedTextCharacters shapedTextCharacters)
{
return(shapedTextCharacters.BidiLevel);
}
var defaultLevel = flowDirection == FlowDirection.LeftToRight ? 0 : 1;
return((sbyte)defaultLevel);
}
public OrderedBidiRun(DrawableTextRun run, sbyte level)
{
Run = run;
Level = level;
}