Add events

event/event.go

@@ -0,0 +1,16 @@
+package event
+
+type EventType string
+
+const INSTANCE_VIEWPORT_RESIZE EventType = "instance viewport resize"
+const INSTANCE_DELETE EventType = "instance delete"
+const INSTANCE_NEW EventType = "instance new"
+const SESSION_END EventType = "session end"
+const SESSION_READY EventType = "session ready"
+
+type Handler func(args ...interface{})
+
+type EventApi interface {
+	Emit(name EventType, args ...interface{})
+	On(name EventType, handler Handler)
+}