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library seaside.component;
import 'continuation.dart';
import 'has_state.dart';
/// Abstract superclass of persistent presenters.
abstract class Component {
/// Iterable of direct child components.
Iterable<Component> get children => [];
/// Iterable over this component and its deep children.
Iterable<Component> get withAllChildren =>
[this].followedBy(children.expand((each) => each.withAllChildren));
/// Iterable of objects that need backtracking.
Iterable<HasState> get states => [];
/// Returns the head contents.
String get head => '';
/// Returns the rendered contents, including its children.
String body(Continuation continuation);
}