font_scaler 1.0.0

FontScaler is a lightweight Flutter package that allows you to dynamically adjust the text scale across your entire app. It supports predefined scale levels (like small, medium, large) and a custom mo [...]

example/lib/main.dart

import 'package:flutter/material.dart';
import 'package:font_scaler/font_scaler.dart';

void main() {
  // Need to Wrap MyApp with FontScaler
  runApp(FontScaler(child: MyApp()));
}

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      // Need to Add FontScalerProvider.of(context).builder to reflect the changes
      builder: FontScalerProvider.of(context).builder,
      home: HomeScreen(),
    );
  }
}


class HomeScreen extends StatelessWidget {
  const HomeScreen({super.key});

  @override
  Widget build(BuildContext context) {
    final textTheme = Theme.of(context).textTheme;
    final primaryColor = Colors.deepPurpleAccent;
    // This will return the currentFontScale whenEver the fontScale Changes
    final currentFontScale =FontScalerProvider.of(context).currentFontScale;
    return Scaffold(
      backgroundColor: Colors.white,
      appBar: AppBar(
        backgroundColor: Colors.white,
        title: Text("Description"),
        actions: [
          Row(
            children: [
              GestureDetector(
                onTap: () {
                  // updateFontScale will update font by given Enum
                  FontScalerProvider.of(context).updateFontScale(FontScale.micro);
                },
                child: Container(
                  height: 30,
                  width: 30,
                  decoration: BoxDecoration(
                    color:currentFontScale==FontScale.micro?primaryColor: Colors.white,
                    border: Border.all(color: primaryColor),
                  ),
                  child: Icon(
                    Icons.text_fields_outlined,
                    size: 14,
                    color:currentFontScale==FontScale.micro?Colors.white: Colors.black,
                  ),
                ),
              ),
              GestureDetector(
                onTap: () {
                  FontScalerProvider.of(context).updateFontScale(FontScale.fDefault);
                },
                child: Container(
                  height: 30,
                  width: 30,
                  decoration: BoxDecoration(
                    color:currentFontScale==FontScale.fDefault?primaryColor: Colors.white,
                    border: Border.all(color: primaryColor),
                  ),
                  child: Icon(
                    Icons.text_fields_outlined,
                    size: 20,
                    color: currentFontScale==FontScale.fDefault? Colors.white:Colors.black,
                  ),
                ),
              ),
              GestureDetector(
                onTap: () {
                  // updateFontScale will update font by given custom double value
                  FontScalerProvider.of(context).updateFontScale(FontScale.custom,customValue: 2.2);
                },
                child: Container(
                  height: 30,
                  width: 30,
                  decoration: BoxDecoration(
                    color:currentFontScale==FontScale.custom?primaryColor: Colors.white,
                    border: Border.all(color: primaryColor),
                  ),
                  child: Icon(
                    Icons.text_fields_outlined,
                    size: 28,
                    color:currentFontScale==FontScale.custom?Colors.white: Colors.black,
                  ),
                ),
              ),
            ],
          ),
          SizedBox(width: 10),
        ],
      ),
      body: SingleChildScrollView(
        padding: EdgeInsets.all(20),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            Center(child: Text("Size: 38 US", style: textTheme.titleLarge)),
            SizedBox(height: 20),
            Row(
              mainAxisAlignment: MainAxisAlignment.spaceEvenly,
              children: [
                for (int i = 0; i < sizeList.length; i++) ...[
                  Container(
                    padding: EdgeInsets.all(10),
                    decoration: BoxDecoration(
                      border: Border.all(color: primaryColor),
                      shape: BoxShape.circle,
                      color: i == 0 ? primaryColor : Colors.white,
                    ),
                    child: Text(
                      sizeList[i].toString(),
                      style: textTheme.labelLarge?.copyWith(
                        color: i == 0 ? Colors.white : primaryColor,
                      ),
                    ),
                  ),
                ],
              ],
            ),
            SizedBox(height: 20),
            Text("Product details", style: textTheme.titleLarge),
            SizedBox(height: 15),
            Text("* Feature 1", style: textTheme.titleSmall),
            SizedBox(height: 5),
            Text("* Feature 2", style: textTheme.titleSmall),
            SizedBox(height: 5),
            Text("* Feature 3", style: textTheme.titleSmall),
            SizedBox(height: 5),
            Text("* Feature 4", style: textTheme.titleSmall),
            SizedBox(height: 5),
            Text("* Feature 5", style: textTheme.titleSmall),
            SizedBox(height: 20),
            Text("Composition", style: textTheme.titleLarge),
            SizedBox(height: 15),
            Text(
              "Outer Material : Cotton 100%  Calf:Leather 100%  Lining: Polyester 100%",
              style: textTheme.titleSmall,
            ),
            SizedBox(height: 20),
            Text("Size and fit", style: textTheme.titleLarge),
            SizedBox(height: 15),
            Text(
              "- Fits true to size. Take your normal Size",
              style: textTheme.titleSmall,
            ),
            Text(
              "- Mid weight, Slightly strechy fabric",
              style: textTheme.titleSmall,
            ),
            Text(
              "- The model is weariing its size larger",
              style: textTheme.titleSmall,
            ),
            SizedBox(height: 20),
            Row(
              children: [
                Container(
                  padding: EdgeInsets.all(10),
                  decoration: BoxDecoration(
                    border: Border.all(color: primaryColor),
                    shape: BoxShape.circle,
                    color: Colors.white,
                  ),
                  child: Icon(Icons.favorite, color: primaryColor),
                ),
                SizedBox(width: 30),
                Expanded(
                  child: GestureDetector(
                    onTap: (){
                      //  This Will Clear the change and remove from local storage and set back to default fontScale
                      FontScalerProvider.of(context).clear();
                    },
                    child: Container(
                      padding: EdgeInsets.all(10),
                      decoration: BoxDecoration(
                        border: Border.all(color: primaryColor),
                        borderRadius: BorderRadius.circular(10),
                        color: primaryColor,
                      ),
                      alignment: Alignment.center,
                      child: Text(
                        "ADD TO CART",
                        style: textTheme.labelLarge?.copyWith(
                          color: Colors.white,
                        ),
                      ),
                    ),
                  ),
                ),
              ],
            ),
          ],
        ),
      ),
    );
  }
}

List<int> sizeList = [38, 40, 42, 44];