This is very handy feature when programming in AS3.
Imagine that you make a AlertBox class, that when called, it makes a custom Alert message. Imagine then, that you can put 1, 2 or 3 buttons, according to the message type.
If you want to reuse this class in several projects, it's a good idea to tell the different buttons what or where to return when it's pressed.
That's were the Function Call Back enters. After a couple of hours and some search in the web, I came up with a solution, which I want to share.
It's very simple.
First declare in your class a variable that will keep the function reference later on, like this:
private var callBack:Function;
Then when you instantiate the Class, one of the arguments, of the constructor or function, will keep the function name, like this:
createAlert(..., callback){
...
}
Finally inside the constructor or function, you have to attribute the argument to the variable you defined earlier, like this:
callBack=callback;
Then place this variable as a call of some event, like this:
button1.addEventListener(MouseEvent.CLICK, callBack);
... and that's it.
If you want to call the call back function with arguments, instead of a event, just call this way:
typeOfMessage=1;
callback(typeOfMessage);
