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

License

For personal and professional use. You cannot resell or redistribute these repositories in their original state.

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