CustomReactiveNode<T> class abstract

Base class for custom reactive nodes with custom update logic.

This class allows you to create reactive nodes that have custom update behavior beyond the standard signal and computed patterns. When a CustomReactiveNode is updated via updateCustom, the system calls updateNode to determine if the node's value has actually changed.

Implementing CustomReactiveNode

Subclasses must implement updateNode to define how the node updates and whether its value has changed. The method should:

• Update the node's internal state if needed
• Return true if the value changed (subscribers will be notified)
• Return false if the value did not change (no notifications)

Example:

class CustomWidgetPropsNode<T> extends CustomReactiveNode<T> {
  CustomWidgetPropsNode() : super(flags: ReactiveFlags.mutable);

  bool _dirty = false;

  @override
  void notify() {
    _dirty = true;
    notifyReactiveNode(this);
  }

  @override
  bool updateNode() {
    if (_dirty) {
      _dirty = false;
      return true; // Value changed, notify subscribers
    }
    return false; // No change
  }
}