Custom WidgetsBinding

[aloisdeniel]

Ideally, a custom WidgetsBinding should be provided to emulate the host.

This would allow to emulate more things :

• Application lifecycle events
• Memory pressure event
• Platform channels
• A mouse pointer

The DevicePreview.appBuilder (injects a custom MediaQuery) and DevicePreview.of(context).locale parameters wouldn't be needed anymore too since they would be managed by the binding itself.

The issue is that the WidgetBindings.instance is unique and static, so it is not possible to override it only from the encapsulated user app.

[enricobenedos]

I need to provide different aspectRatio on iOS and Android devices.

  double _calculateAspectRatio(Orientation orientation) {
    final Size screenSize = MediaQuery.of(context).size;

    if (Platform.isIOS && orientation == Orientation.portrait) {
      return (screenSize.height / screenSize.width) / 0.85;
    } else if (orientation == Orientation.portrait) {
      return (screenSize.height / screenSize.width);
    } else {
      return (screenSize.width / screenSize.height);
    }
  }

Simulate the platform channel could be a very good improvement!