Adaptive Chameleon Theme

A Flutter package that will automatically retrieve your OS defined Theme (Dynamic), force your prefered one (Light / Dark), allow you to present the user with a set of color themes to choose from and of course, persist this choice in your device.

Features

• Set default theme
• Override system theme mode and set yours (light/dark)
• Change theme colors
• Customize color palettes for different theme modes

Demo

Click below to watch a quick demo.

Getting started

Add the following dependency to your pubspec.yaml

dependencies:
  adaptive_chameleon_theme: <latest_version>

Usage

This package allows for an arbitrary number of themes to be defined. Each theme has a unique ID of type int. To create the themes and map them to IDs, first you have to create an instance of ThemeCollection, like so:

final themeCollection = ThemeCollection(
    themes: {
        0: ThemeData(primarySwatch: Colors.blue),
        1: ThemeData(primarySwatch: Colors.red),
    },
    fallbackTheme: ThemeData.light(), // optional fallback theme, default value is ThemeData.light()
);

I would however recommend you introduce a class with static const int values to associate a name to each ID value for easier reference:

class AppThemes {
    static const int LightBlue = 0;
    static const int LightRed = 1;
}
final themeCollection = ThemeCollection(
    themes: {
        AppThemes.LightBlue: ThemeData(primarySwatch: Colors.blue),
        AppThemes.LightRed: ThemeData(primarySwatch: Colors.red),
    },
    fallbackTheme: ThemeData.light(),
);
final darkThemeCollection = ThemeCollection(
    themes: {
        AppThemes.Blue: ThemeData(primarySwatch: Colors.blue),
        AppThemes.Red: ThemeData(primarySwatch: Colors.red),
    },
    fallbackTheme: ThemeData.dark(),
);

NOTE: Remember to define a collection of dark themes equivalent in number to the normal themes.

Proceed to wrap your MaterialApp with AdaptiveChameleonThemeWidget in order to apply and modify UI themes.

import 'package:example/themes.dart';
import 'package:flutter/material.dart';

import 'package:adaptive_chameleon_theme/adaptive_chameleon_theme.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {

  @override
  Widget build(BuildContext context) {
    return AdaptiveChameleonThemeWidget(
            themeCollection: AppThemes.themeCollection,
            darkThemeCollection: AppThemes.darkThemeCollection,
            defaultThemeId: AppThemes.aokiji, // optional, default id is 0
            builder: (context, theme, darkTheme, themeMode) {
              return MaterialApp(
                title: 'Flutter Demo',
                theme: theme,
                darkTheme: darkTheme,
                themeMode: themeMode,
                home: const MyHomePage(title: 'Adaptive Chameleon Theme'),
              );
            }
    );
  }
}

Changing Theme Mode

You can utilise the changeThemeMode function from anywhere in your app. It provides a simple and straight forward way of altering the theme modes: light to dark, dark to light or to system default.

This function has two optional parameters: dynamic and dark. If the value of dynamic is true, it takes precedence over dark.

  // sets theme mode to dark
  AdaptiveChameleonTheme.of(context).changeThemeMode(dark: true);
  
  // sets theme mode to light
  AdaptiveChameleonTheme.of(context).changeThemeMode(dark: false);
  
  // sets theme mode to system default
  AdaptiveChameleonTheme.of(context).changeThemeMode(dynamic: true);

Changing Theme Color

The theme can be set anywhere in the app, provided you have a BuildContext, e.g.:

  AdaptiveChameleonTheme.of(context).setTheme(AppThemes.LightRed);

By setting the theme, its ID is automatically saved via the shared_preferences package, so the next time the app starts, the theme can be restored automatically.

How to get the current theme

Current app ThemeMode

  ThemeMode themeMode = AdaptiveChameleonTheme.of(context).themeMode;  

The above example will return a value of the enum used by MaterialApp's ThemeMode with one of the following values:

system - Use either the light or dark theme based on what the user has selected in the system settings.

light - Always use the light mode regardless of system preference.

dark - Always use the dark mode (if available) regardless of system preference.

Current app ThemeId

To get the ID of the current theme, for example to create a selection UI as done in the example app provided with this package, call

  final themeId = AdaptiveChameleonTheme.of(context).themeId;

Also Included

The plugin contains some out-of-the-box widgets to make implementation easier.

ThemeModeSelectorWidget

This is a toggle buttons widget that allows you to switch theme modes.

  const ThemeModeSelectorWidget()

ThemeColorSelectorWidget

This is a toggle buttons widget that allows you to switch theme colors.

  ThemeColorSelectorWidget(
    themeCollection: AppThemes.themeCollection,
    selectedTheme: AdaptiveChameleonTheme.of(context).themeId,
  )

Example

The example app can be found in the example folder. It implements a dropdown menu to select between 5 themes. The app is the source for the video demo above.

Showcase

Using this package in a live app? Let me know and I will add it here.

Maintainer

• Kevin Omyonga

If you experience any problems using this package, please create an issue on Github. Pull requests are also welcome.

Acknowledgements

Many thanks to the projects/packages below that served as inspiration for this undertaking:

• dynamic_theme package from Norbert Kozsir
• easy_dynamic_theme package from Rene Lazo Mendez
• dynamic_themes package from Julian Aßmann

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