third_party/extended_text_library/src/background_text_span library

Typedefs

PaintBackground = bool Function(BackgroundTextSpan backgroundTextSpan, Canvas canvas, Offset offset, TextPainter? painter, Rect rect, {Offset? endOffset, TextPainter? wholeTextPainter})
if you don't want use default, please return true. endOffset is the text top-right Offfset allTextPainter is the text painter of extended text. painter is current background text painter