A method to know the width of a text before rendering it.

text_size.dart

/// Finds the width of a text before rendering it.
  Size findTextSize(
      {required String text,
      TextStyle style = textStyle,
      required BuildContext context,
      TextDirection textDirection = TextDirection.rtl}) {
    final Size size = (TextPainter(
            text: TextSpan(text: text, style: style),
            maxLines: 5,
            textScaleFactor: MediaQuery.of(context).textScaleFactor,
            textDirection: textDirection)
          ..layout(minWidth: 0, maxWidth: double.infinity))
        .size;
    return size;
  }