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One Context to rule them all

OneContext provides a simple way to deal with Dialogs, Overlays, Navigations, Theme* and MediaQuery* with no need of BuildContext.

If you are Flutter developer, you donโ€™t have to learn something new. This package use the same identificators and names from framework. Itโ€™s not a specialized* implementation, so you have the power to create and do not get blocked because of that.

If you are Flutter package developer, OneContext can be very useful too! You can create a custom dialogs package with no need BuildContext, and release a version, that do not depends of the context, to the comunity.

one_context_demo

BuildContext always is needed (in some cases we need to choose carefully the specific one to make things work as expected), but, to global things, like dialogs, it can be reached by OneContext package. ๐ŸŽฏ

๐ŸŽฎ Let's start

There are 2 ways to get OneContext singleton instance, OneContext() or OnceContext.intance. e.g.

    OneContext().pushNamed('/detail_page');
    OneContext.instance.pushNamed('/detail_page');

There are controllers to use navigation, overlays and dialogs. e.g.

    OneContext().navigator.pushNamed(...);
    OneContext().dialog.showDialog(...);
    OneContext().overlay.addOverlay(...);

Or, you can use the shortcuts ;)

    OneContext().pushNamed(...);
    OneContext().showDialog(...);
    OneContext().addOverlay(...);
    
    // and can access info from:
    // OneContext().mediaQuery ...
    // OneContext().textTheme ...
    // OneContext().theme ...

OneContext is:

  • Fast (O(1))
  • Easy to learn/use
  • It use same native function names from Flutter, to keep it simple and intuitive ;)

๐Ÿ’ฌ How to show Dialogs with no need of the BuildContext?

// example snackBar
OneContext().showSnackBar(
    builder: (_) => SnackBar(content: Text('My awesome snackBar!'))
);
// example dialog
OneContext().showDialog(
    // barrierDismissible: false,
    builder: (_) => AlertDialog( 
        title: new Text("The Title"),
        content: new Text("The Body"),
    )
);
// example bottomSheet
OneContext().showBottomSheet(
    builder: (context) => Container(
    alignment: Alignment.topCenter,
    height: 200,
    child: IconButton(
        icon: Icon(Icons.arrow_drop_down),
        iconSize: 50,
        color: Colors.white,
        onPressed: () => Navigator.of(context).pop('sucess')), // or OneContext().popDialog('sucess');
    ),
);
// example modalBottomSheet
OneContext().showModalBottomSheet<String>(
    builder: (context) => Container(
        child: Column(
            mainAxisSize: MainAxisSize.min,
            children: <Widget>[
            ListTile(
                leading: Icon(Icons.music_note),
                title: Text('Music'),
                onTap: () => OneContext().popDialog('Music'); //Navigator.of(context).pop('Music')),
            ListTile(
                leading: Icon(Icons.videocam),
                title: Text('Video'),
                onTap: () => Navigator.of(context).pop('Video'),
            ),
            SizedBox(height: 45)
            ],
        ),
    )
);

โ›ต How to navigate? (All methods from Navigator Class are available)

// go to second page using named route
OneContext().pushNamed('/second');
// go to second page using MaterialPageRoute
OneContext().push(MaterialPageRoute(builder: (_) => SecondPage()));
// go back from second page
OneContext().pop();
// Retrieve data from route when it's pops
String result = await OneContext().push<String>(MaterialPageRoute(builder: (_) => SecondPage()));
print(result);

๐Ÿฐ How to show Overlays?

// show the default progress indicator
OneContext().showProgressIndicator();
// hide the default progress indicator
OneContext().hideProgressIndicator();
// show the default progress indicator with some colors
OneContext().showProgressIndicator(
    backgroundColor: Colors.blue.withOpacity(.3),
    circularProgressIndicatorColor: Colors.white
);

// Later
OneContext().hideProgressIndicator();
// Show a custom progress indicator
OneContext().showProgressIndicator(
    builder: (_) => MyAwesomeProgressIndicator();
);

// Later
OneContext().hideProgressIndicator();
// Show a custom widget in overlay stack

String myCustomAndAwesomeOverlayId = UniqueKey().toString();

OneContext().addOverlay(
    overlayId: myCustomAndAwesomeOverlayId,
    builder: (_) => MyCustomAndAwesomeOverlay()
);

// Later
OneContext().removeOverlay(myCustomAndAwesomeOverlayId);

๐ŸŽจ Changing Dark and Light theme mode

Breaking change: OneHotReload becomes OneNotificationBuilder

OneNotification<OneThemeChangerEvent>(
  stopBubbling: true, // avoid bubbling to ancestors
  builder: (_, __) {
    return MaterialApp(
      builder: OneContext().builder,
      themeMode: OneThemeController.initThemeMode(ThemeMode.light),
      theme: OneThemeController.initThemeData(ThemeData(brightness: Brightness.light)),
      darkTheme: OneThemeController.initDarkThemeData(ThemeData(brightness: Brightness.dark)),
      ...
    );
);

// Later...
OneContext().oneTheme.toggleMode();

// Or change only the dark theme
OneContext().oneTheme.changeDarkThemeData(
  ThemeData(
    primarySwatch: Colors.amber,
    brightness: Brightness.dark
 )
);

๐Ÿšง Reload, Restart and Reboot the app (Need bubbling events or data?)

The concept of using Notifications:

First define the data type in type generics, after that, you can rebuild multiple ancestors widgets that listen the same data type. This is used for the package in this example, to change ThemeMode and Locale and even Restart the app entirely.

OneNotification<List<Locale>>(
      onVisited: (context, localeList) {
        print('widget visited!');
      },
      stopBubbling: true, // avoid the data bubbling to ancestors widgets
      initialData: _localeEnglish, // [data] is null during boot of the application, but you can set initialData
      rebuildOnNull: true, // Allow other entities reload this widget without messing up currenty data (Data is cached on first event)
      builder: (context, localeList) {
        return MaterialApp(
          supportedLocales: localeList,
        );
      },
    );

Need to dispatch more specialized data/event?


// My Specialized Event
class MySpecializedEvent {
  final String text;
  MySpecializedEvent(this.text);
}

// Widget
OneNotification<MySpecializedEvent>(
  builder: (context, event) {
    return Text(event.text);
  },
)

// Later, in children, call `OneNotifier.notify` to get ancestors notified
OneNotifier.notify(
  context,
  NotificationPayload(
    data: MySpecializedEvent('Nice!');
  )
);

Reload and Restart the app

// Place that widget on most top
OneNotification(
  builder: (_, __) => child
);

// Later... in children

// Dont lose state
OneNotification.softReloadRoot(context);

// Lose state
OneNotification.hardReloadRoot(context);

Reboot and load different apps

// Set the main() function
void main() => OnePlatform.app = () => MyApp();

// Later... Call reboot without recreating root app
OnePlatform.reboot();

// Later... Call reboot recreating the entire application
OnePlatform.reboot(
  builder: () => MyApp()
);

// You even can load an entire different app
OnePlatform.reboot(
  builder: () => MyApp2()
);

โš™ Theme and MediaQuery

print('Platform: ' + OneContext().theme.platform); // TargetPlatform.iOS
print('Orientation: ' + OneContext().mediaQuery.orientation); // Orientation.portrait

โš  Important: Configure MaterialApp. e.g.

/// important: Use [OneContext().builder] in `MaterialApp` builder, in order to show dialogs and overlays.
/// important: Use [OneContext().key] in `MaterialApp` navigatorKey, in order to navigate.
return MaterialApp(
    builder: OneContext().builder,
    navigatorKey: OneContext().key,
    ...
);

In initState (Can not show dialog if markNeedsBuild, so schedule to next frame)

@override
  void initState() {
    super.initState();

    WidgetsBinding.instance.addPostFrameCallback(
      (duration) => OneContext().showDialog(
        builder: (_) => AlertDialog(
          title: new Text("On Page Load"),
          content: new Text("Hello World!"),
        ),
      ),
    );

๐Ÿšฆ Warnings

* OneContex().theme and OneContex().mediaQuery are global instances of the root of the widget tree. Use it with care! It can reproduce unexpected behavior if you don't understand it.

* OneContext().context is like a root context, so, it should not be used directly, as it can reproduce unexpected behaviors, unless you have a understanding how it works. It shouldn't work well with InheritedWidget for example.

* This package only uses specialized implementation in Overlays, to make things easy and ensure a quick start.

๐Ÿ‘จโ€๐Ÿ’ป๐Ÿ‘จโ€๐Ÿ’ป Contributing

Contributions of any kind are welcome! I'll be glad to analyse and accept them! ๐Ÿ‘พ

If you have any question about the project:

Email-me: fastencoding@gmail.com

Connect with me at LinkedIn.

Libraries

one_context