A Customizable Dynamic Font Loader for Flutter with Caching Enabled

Dynamic Cached Fonts

A customizable dynamic font loader for flutter with caching enabled. Supports Firebase Cloud Storage too!

Demo 3

Introduction

Dynamic Cached Fonts allows you to dynamically load a font from any url and cache it. This way, you can reduce your bundle size and load the font if and when it's required.

Another advantage of dynamically loading fonts is that you can now easily provide an option to your users to pick an app font. This allows for a greater level of customization.

Caching is an added performance upgrade as the font will be downloaded only once and used multiple times, reducing network and battery usage.

Get Started

To use the package, add dynamic_cached_fonts as a dependency.

Usage

Loading fonts on demand

You can load font on demand, for example - when a page loads

@override
void initState() {
  final DynamicCachedFonts dynamicCachedFont = DynamicCachedFonts(
    fontFamily: fontFamilyName, // The font family name to be passed to TextStyle.fontFamily
    url: fontUrl, // A valid url pointing to a font file (.ttf or .otf files only) 
  );
  dynamicCachedFont.load(); // Downloads the font, caches and loads it.

  super.initState();
}
...
Text(
  'Some Text',
  style: TextStyle(fontFamily: fontFamilyName),
)

Demo 1

Or when a button is clicked

ElevatedButton(
  onPressed: () {
    final DynamicCachedFonts dynamicCachedFont = DynamicCachedFonts(
      fontFamily: fontFamilyName,
      url: fontUrl,
    );

    dynamicCachedFont.load();
  },
  child: const Text('Load Font'),
),

Demo 2

If you want to change how large the cache can be or maybe how long the font stays in cache, pass in maxCacheObjects and cacheStalePeriod.

DynamicCachedFonts(
  fontFamily: fontFamilyName,
  url: fontUrl,
  maxCacheObjects: 150,
  cacheStalePeriod: const Duration(days: 100),
);

TextStyle.fontFamilys are applied only after load() is called.

Calling load() more than once throws a StateError

What if you need to load multiple fonts, of varying weights and styles, as a single family...For that, you can use the DynamicCachedFonts.family constructor.

It accepts a list of urls, pointing to different fonts in the same family, as urls.

DynamicCachedFonts.family(
  urls: <String>[
    fontFamilyNameBoldUrl,
    fontFamilyNameItalicUrl,
    fontFamilyNameRegularUrl,
    fontFamilyNameThinUrl,
  ],
  fontFamily: fontFamilyName,
);

Demo 5

If you need more control, use the static methods!

cacheFont

onPressed: () {
  DynamicCachedFonts.cacheFont(fontUrl);
},
child: const Text('Download font'),

You can pass in maxCacheObjects and cacheStalePeriod here as well.

canLoadFont, loadCachedFont, loadCachedFamily

canLoadFont is used to check whether the font is available in cache. It is usually used in combination with the loadCached* methods.

First, Check whether the font is already in cache. If it is, then load the font.

if(DynamicCachedFonts.canLoadFont(fontUrl)) {
  // To load a single font...
  DynamicCachedFonts.loadCachedFont(
    fontUrl,
    fontFamily: fontFamilyName,
  );

  // Or if you want to load multiple fonts as a family...
  DynamicCachedFonts.loadCachedFamily(
    <String>[
      fontFamilyNameBoldUrl,
      fontFamilyNameItalicUrl,
      fontFamilyNameRegularUrl,
      fontFamilyNameThinUrl,
    ],
    fontFamily: fontFamilyName,
  );
}

Now, if the font isn't available in cache, download it!

if(DynamicCachedFonts.canLoadFont(fontUrl)) {
  ...
} else {
  DynamicCachedFonts.cacheFont(fontUrl);
}

removeCachedFont

To remove a font from cache permanently, use removeCachedFont.

Note - This does not change the font immediately until a complete app restart.

Demo 3

Finally, if you want to customize their implementation, extend RawDynamicCachedFonts and override the static methods.

Have a custom font to load from Firebase Cloud Storage? Go for the DynamicCachedFonts.fromFirebase constructor! It accepts a Google Cloud Storage location which is a url starting with gs://. Other than that, it is similar to the default constructor.

Tip: Use DynamicCachedFonts.toggleVerboseLogging to log detailed statuses and configurations for debugging.

Demo 4

Bug Reports and Help

If you find a bug, please open an issue on Github or if you need any help, let's discuss on Github Discussions!

Contributing

To make things easier, you can use docker compose to set up a dev environment. Just run docker compose run linux to set up a Linux dev environment or run docker compose run windows to set up a Linux dev environment.

Use this package as a library

Depend on it

Run this command:

With Flutter:

 $ flutter pub add dynamic_cached_fonts

This will add a line like this to your package's pubspec.yaml (and run an implicit flutter pub get):

dependencies:
  dynamic_cached_fonts: ^0.3.1

Alternatively, your editor might support or flutter pub get. Check the docs for your editor to learn more.

Import it

Now in your Dart code, you can use:

import 'package:dynamic_cached_fonts/dynamic_cached_fonts.dart'; 

example/lib/main.dart

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

import 'constants.dart';
import 'src/components.dart';
import 'src/demos.dart';

void main() {
  DynamicCachedFonts.toggleVerboseLogging(true);

  runApp(
    const MaterialApp(
      title: 'Dynamic Cached Fonts Demo',
      home: DynamicCachedFontsDemo1(),
    ),
  );
}

class DynamicCachedFontsDemo1 extends StatefulWidget {
  const DynamicCachedFontsDemo1({Key? key}) : super(key: key);

  @override
  _DynamicCachedFontsDemo1State createState() =>
      _DynamicCachedFontsDemo1State();
}

class _DynamicCachedFontsDemo1State extends State<DynamicCachedFontsDemo1> {
  @override
  void initState() {
    final DynamicCachedFonts dynamicCachedFont = DynamicCachedFonts(
      fontFamily: cascadiaCode,
      url: cascadiaCodeUrl,
    );
    dynamicCachedFont.load();

    super.initState();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text(demoTitle),
      ),
      body: const Center(
        child: DisplayText(
          'The text is being displayed in $cascadiaCode which is being dynamically loaded and cached',
          fontFamily: cascadiaCode,
        ),
      ),
      floatingActionButton: ExtendedButton(
        icon: Icons.navigate_next,
        label: 'Next Example',
        onPressed: () => Navigator.push(
          context,
          MaterialPageRoute<DynamicCachedFontsDemo2>(
            builder: (_) => const DynamicCachedFontsDemo2(),
          ),
        ),
      ),
    );
  }
} 

Download Details:

Author: sidrao2006

Source Code: https://github.com/sidrao2006/dynamic_cached_fonts

#dynamic  #flutter #fonts

A Customizable Dynamic Font Loader for Flutter with Caching Enabled
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💥 Save TIME with a custom TEXT component!
https://www.patreon.com/posts/custom-reusable-47843654

Directory for import and package names for all fonts: https://directory.now.sh/

If you enjoyed this video please consider supporting me on Patreon! https://www.patreon.com/designintocode

💾 Source Code
https://bit.ly/38U5ohl

💬 Come chat on Discord!
https://discord.gg/xg5auu4

❤️ Subscribe for awesome videos! http://bit.ly/2KZU1ds

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https://www.youtube.com/watch?v=TkuQAjnaSbM&list=PLqtWgQ5BRLPvaAnoiZD8_z2RTh1VYVqN2

✅ Taking Designs and Turning them Into Code
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✅ Awesome React Native Videos!
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Follow me!
Twitter: http://bit.ly/2MdnXBX

Software Used:
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#reactnative #expo #fonts

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Could you introduce yourself and what fonts mean to you?

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