Support OnMultiple

.gitignore

@@ -22,3 +22,5 @@ v2/test/**/frontend/dist
 v2/test/**/build/
 v2/test/frameless/icon.png
 v2/test/hidden/icon.png
+v2/internal/ffenestri/runtime.c
+v2/internal/runtime/assets/desktop.js

v2/internal/runtime/goruntime/events.go

@@ -9,6 +9,7 @@ import (
 type Events interface {
 	On(eventName string, callback func(optionalData ...interface{}))
 	Once(eventName string, callback func(optionalData ...interface{}))
+	OnMultiple(eventName string, callback func(optionalData ...interface{}), maxCallbacks int)
 	Emit(eventName string, optionalData ...interface{})
 }
 
@@ -24,7 +25,7 @@ func newEvents(bus *servicebus.ServiceBus) Events {
 	}
 }
 
-// On pass through
+// On registers a listener for a particular event
 func (r *event) On(eventName string, callback func(optionalData ...interface{})) {
 	eventMessage := &message.OnEventMessage{
 		Name:     eventName,
@@ -34,7 +35,8 @@ func (r *event) On(eventName string, callback func(optionalData ...interface{}))
 	r.bus.Publish("event:on", eventMessage)
 }
 
-// On pass through
+// Once registers a listener for a particular event. After the first callback, the
+// listener is deleted.
 func (r *event) Once(eventName string, callback func(optionalData ...interface{})) {
 	eventMessage := &message.OnEventMessage{
 		Name:     eventName,
@@ -44,6 +46,17 @@ func (r *event) Once(eventName string, callback func(optionalData ...interface{}
 	r.bus.Publish("event:on", eventMessage)
 }
 
+// OnMultiple registers a listener for a particular event, for a given maximum amount of callbacks.
+// Once the callback has been run `maxCallbacks` times, the listener is deleted.
+func (r *event) OnMultiple(eventName string, callback func(optionalData ...interface{}), maxCallbacks int) {
+	eventMessage := &message.OnEventMessage{
+		Name:     eventName,
+		Callback: callback,
+		Counter:  maxCallbacks,
+	}
+	r.bus.Publish("event:on", eventMessage)
+}
+
 // Emit pass through
 func (r *event) Emit(eventName string, optionalData ...interface{}) {
 	eventMessage := &message.EventMessage{

v2/test/runtime/runtime.go

@@ -26,6 +26,9 @@ func (r *RuntimeTest) WailsInit(runtime *wails.Runtime) error {
 	r.runtime.Events.Once("testeventonce", func(optionalParams ...interface{}) {
 		println("I only get called once!")
 	})
+	r.runtime.Events.OnMultiple("testeventmultiple", func(optionalParams ...interface{}) {
+		println("I only get called 3 times!")
+	}, 3)
 	return nil
 }