In order to append the bytes to an existing file, pass FileMode. append as the optional mode parameter . If the argument flush is set to true , the data written will be flushed to the file system before the returned future completes.
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Syntax: RichText( {Key key, @required InlineSpan text, TextAlign textAlign: TextAlign. start, TextDirection textDirection, bool softWrap: true, TextOverflow overflow: TextOverflow. clip, double textScaleFactor: 1.0, int maxLines, Locale locale, StrutStyle strutStyle, TextWidthBasis textWidthBasis: TextWidthBasis.
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