public void TextWithGroupRuby(UString baseText, UString rubyText)
{
var baseBuffer = new TextBuffer(_zwSize, _wordWrap, _advancing, _latinMetric, 64);
var rubyBuffer = new TextBuffer(_rubyZwSize, _wordWrap, _advancing, _latinMetric, 128);
_buffer.MoveLastLetterStateTo(baseBuffer);
baseBuffer.Append(baseText);
rubyBuffer.Append(rubyText);
_buffer.AppendObject(new GroupRuby(baseBuffer.ToArray(), rubyBuffer.ToArray()));
baseBuffer.MoveLastLetterStateTo(_buffer);
baseBuffer.Clear();
rubyBuffer.Clear();
}