Event Handling - Pro Unity Game Development with C# - page 109

09 // Use this for initialization
10 void Start ()
11 {
12 //Register this object as a listener for keyboard notifications
13 if(Notifications!=null)
14 Notifications.AddListener(this, "OnKeyboardInput");
15 }
16
17 //This function will be called by the NotificationsManager when keyboard events occur
18 public void OnKeyboardInput(Component Sender)
19 {
20 //Print to console
21 Debug.Log("Keyboard Event Occurred");
22 }
23 }
Be sure to drag and drop the Listener.cs file onto the Listener object in the scene, and then assign
the public Notifications member in the Object Inspector to the NotificationsManager component,
as we did for the Poster object. Notice in Listing 3-15 that a correspondence exists between the two
classes, Poster and Listener , regarding the event name as a string. The Poster posts notifications
for event OnKeyboardInput , and the Listener registers for the same event, as well as implements a
function of that name, which will be invoked by the NotificationsManager using the SendMessage API
function (see Figure 3-12 ).
Figure 3-12. Remember to assign the Notifications member of the Listener to the single instance of NotificationsManager in
the scene