example_test.go

package event

import (
	"fmt"
)

func Example() {
	// Custom event type
	type MyEvent struct {
		Message string
	}

	// Create a new event manager.
	mgr := New()

	// Subscribe to the event.
	Subscribe(mgr, 0, func(e *MyEvent) {
		// Handle the event.
		fmt.Println("handler A received event:", e.Message)
	})

	// Subscribe to the event higher priority.
	Subscribe(mgr, 1, func(e *MyEvent) {
		// Handle the event.
		fmt.Println("handler B received event:", e.Message)
		e.Message = "hello gophers"
	})

	unsubscribe := Subscribe(mgr, 0, func(e *MyEvent) {
		// Handle the event.
		fmt.Println("handler C received event:", e.Message)
	})
	// Unsubscribe from the event if you want to or ignore and never call it.
	unsubscribe()

	// Fire the event.
	mgr.Fire(&MyEvent{Message: "hello world"})
}