++1

That would be awesome!!!

Any progress on this? would be great to have this feature.

Much Needed Feature!

bump

Absolutely Required

I will love it

This is a much required feature please

any new news !!

anu update ?

I am also using Google Fonts, I first download it and using like this

theme: pw.ThemeData.withFont(
        base:
            Font.ttf(await rootBundle.load("assets/fonts/Sarabun-Regular.ttf")),
        bold: Font.ttf(await rootBundle.load("assets/fonts/Sarabun-Bold.ttf")),
      ),

@GuvanchBayryyyev can you please elaborate?

This is proving more complex than initially thought and requires a thorough refactor, along with tackling #129.

It seems that this could be done somewhat reasonably by allowing users to construct a FontLoader instance instead of always constructing one in loadFontByteData. Something like this, in google_fonts.dart:

class _Config {
  // .. snip ..

  /// If provided, this function will be invoked to construct a font loader
  /// instance for loading the given family name. If left null, a font loader
  /// instance will be constructed automatically.
  FontLoader Function(String familyName)? fontLoaderBuilder;
}

Then in google_fonts_base.dart:

Future<void> loadFontByteData(
  String familyWithVariantString,
  Future<ByteData?>? byteData,
) async {
  if (byteData == null) return;
  final fontData = await byteData;
  if (fontData == null) return;

  final FontLoader fontLoader =
      GoogleFonts.config.fontLoaderBuilder?.call(familyWithVariantString) ??
          FontLoader(familyWithVariantString);
  fontLoader.addFont(Future.value(fontData));
  await fontLoader.load();
}

Users could then implement a FontLoader subclass like so:

class MyFontLoader extends FontLoader {
  MyFontLoader(super.family);

  @override
  void addFont(Future<ByteData> bytes) {
    super.addFont(bytes.then((bytes) {
      log('Loaded font $family, size ${bytes.lengthInBytes}');
      return bytes;
    }));
  }
}

and register it like this:

GoogleFonts.config.fontLoaderBuilder = (n) => MyFontLoader(n);

@guidezpl If this seems appropriate I am happy to open a PR with this change.

NB most of the Google-served fonts are packaged in WOFF2 format, which is not directly supported by Flutter. In that sense this API addition is somewhat questionable, though it could be considered future-facing for a later Flutter that does support WOFF2.