stack_wallet/lib/themes/theme_providers.dart

import 'dart:io';

import 'package:flutter/cupertino.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:flutter_svg/flutter_svg.dart';
import 'package:stackwallet/models/isar/sw_theme.dart';
import 'package:stackwallet/themes/defaults/dark.dart';

final applicationThemesDirectoryPathProvider = StateProvider((ref) => "");

final themeProvider = StateProvider<StackTheme>((ref) {
  // Return default if no theme was properly loaded on startup. This should
  // technically never actually be read but we don't want an optional.
  // Ideally Riverpod would would give us some kind of 'late' provider option
  return StackTheme.fromJson(
    json: darkJson,
    // Explicitly use ref.read here as we do not want any rebuild on this
    // value change.
    applicationThemesDirectoryPath:
        ref.read(applicationThemesDirectoryPathProvider),
  );
});

/// example
class ExampleWidget extends ConsumerWidget {
  const ExampleWidget({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    return Column(
      children: [
        const Text("Hello, world!"),
        SvgPicture.file(
          File(
            ref.watch(themeProvider).assets.plus,
          ),
        ),
      ],
    );
  }
}