OneTimeEventBuilder class

A widget that fetches a single event from Nostr relays once and provides it to a builder function.

This widget is useful for fetching one specific event, such as a user's profile metadata or a specific note by its ID. It uses OneTimeEventsBuilder internally and returns only the first event from the result set.

Unlike FlutterNostrFeed, this builder does not automatically update when new events arrive. It fetches once and displays the result.

Example usage:

OneTimeEventBuilder(
  filter: NostrFilter(
    kinds: [0], // User profile
    authors: ['user_pubkey_here'],
  ),
  builder: (context, isLoading, error, subscriptionId, event) {
    if (isLoading) return CircularProgressIndicator();
    if (error != null) return Text('Error: $error');
    if (event == null) return Text('No profile found');

    final profile = event.content; // Parse JSON profile data
    return ProfileWidget(profile: profile);
  },
)

See also:

• OneTimeEventsBuilder for fetching multiple events
• FlutterNostrFeed for reactive feeds that update automatically

Inheritance

• Object
• DiagnosticableTree
• Widget
• StatelessWidget
• OneTimeEventBuilder

Constructors

OneTimeEventBuilder({Key? key, required NostrFilter filter, required Widget builder(BuildContext context, bool isLoading, Object? error, String? subscriptionId, NostrEvent? event)})

const

Properties

builder → Widget Function(BuildContext context, bool isLoading, Object? error, String? subscriptionId, NostrEvent? event)

Builder function that receives the context, loading state, error, subscription ID, and the event

final

filter → NostrFilter

The Nostr filter to use for fetching the event

final

hashCode → int

The hash code for this object.

no setter, inherited

key → Key?

Controls how one widget replaces another widget in the tree.

final, inherited

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

Methods

build(BuildContext context) → Widget

Describes the part of the user interface represented by this widget.

override

createElement() → StatelessElement

Creates a StatelessElement to manage this widget's location in the tree.

inherited

debugDescribeChildren() → List<DiagnosticsNode>

Returns a list of DiagnosticsNode objects describing this node's children.

inherited

debugFillProperties(DiagnosticPropertiesBuilder properties) → void

Add additional properties associated with the node.

inherited

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

toDiagnosticsNode({String? name, DiagnosticsTreeStyle? style}) → DiagnosticsNode

Returns a debug representation of the object that is used by debugging tools and by DiagnosticsNode.toStringDeep.

inherited

toString({DiagnosticLevel minLevel = DiagnosticLevel.info}) → String

A string representation of this object.

inherited

toStringDeep({String prefixLineOne = '', String? prefixOtherLines, DiagnosticLevel minLevel = DiagnosticLevel.debug, int wrapWidth = 65}) → String

Returns a string representation of this node and its descendants.

inherited

toStringShallow({String joiner = ', ', DiagnosticLevel minLevel = DiagnosticLevel.debug}) → String

Returns a one-line detailed description of the object.

inherited

toStringShort() → String

A short, textual description of this widget.

inherited

Operators

operator ==(Object other) → bool

The equality operator.

inherited