event_listener

Description:

event listener

EventListener #



NodeJS like Event Listener library for dart!
Usage #
On event #
import 'package:event_listener/event_listener.dart';

void main() {
var eventListener = new EventListener();

eventListener.on('log', (String message) {
print("A log: " + message);
});

eventListener.emit('log', 'from me');
}
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Once event fires one time #
import 'package:event_listener/event_listener.dart';

void main() {
var eventListener = new EventListener();

//This event created by package called every time when you assign new listener to event
eventListener.on('newListener', (MapEntry<String, Event> deletedEvent) {
print("New event name: " + deletedEvent.key);
print("New event caller: " + deletedEvent.value.caller);
});
/*
New event name: log
new event caller: closure (String message) =>
*/

eventListener.once('log', (String message) {
print("A last log: " + message);
//A last log: from me
});
eventListener.emit('log', 'from me');
}
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Remove listener #
import 'package:event_listener/event_listener.dart';

void main() {
var eventListener = new EventListener();

//This event created by package called every time when you remove a listener from event
eventListener.on('removeListener', (MapEntry<String, Event> deletedEvent) {
print("Deleted event name: " + deletedEvent.key);
print("Deleted event caller: " + deletedEvent.value.caller);
});
/*
Deleted event name: log
Deleted event caller: closure (String message) =>
*/

var logMe = (message) {
print("A last log: " + message);
}
//A last log: from me

eventListener.once('log', logMe);
eventListener.emit('log', 'from me');
eventListener.removeEventListener('log', logMe);
}
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Remove all listeners #
import 'package:event_listener/event_listener.dart';

void main() {
var eventListener = new EventListener();

var logMe = (String message) {
print("A last log: " + message);
}

eventListener.once('log', logMe);
eventListener.on('log', logMe);
eventListener.emit('log', 'from me');
eventListener.removeAllListeners('log');
}
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Contributing #
This package made close as NodeJS's Event Listener module, feel free to modify package as long as it looks familiar to Node package