StreamControllerWrapper<T> class

A StatefulWidget that provides a StreamController to its child builder and handles the controller's lifecycle.

StreamControllerWrapper is useful for managing a StreamController within a widget subtree, ensuring the controller is properly created and disposed, and allowing callbacks for stream listen and cancel events.

This widget is commonly used in scenarios where a local StreamController is required for event handling, such as for reactive UI updates, simplified state management, or custom input streams.

Example

StreamControllerWrapper<int>(
  child: (controller) {
    return StreamBuilder<int>(
      stream: controller.stream,
      builder: (context, snapshot) {
        return ElevatedButton(
          onPressed: () => controller.add(1),
          child: Text('Current value: ${snapshot.data ?? 0}'),
        );
      },
    );
  },
)

See also:

• StreamController, which provides a way to manage a stream of events.
• StreamBuilder, which builds a widget tree based on the latest snapshot of interaction with a Stream.
• ValueNotifierWrapper, a similar pattern but for ValueNotifier.