object listener

[ym54]

hello I am about to work on making a game (which will be glitchy ost likely but this game is just experimental to help me learn)

and I got some code from an earlier post and would like to know what an object listener is.
Thanks

[samac1068]

Without an opportunity to see the code, you may be mixing up a couple of terms. You have objects, which makes up the bulk of object-oriented programming and you have listeners. There are different type of listeners depending on what you are listening for.

Can you be more specific or supply the lines of code that contains your question?

[ym54]

stage.addEventListener(KeyboardEvent.KEY_DOWN, kDown);



function kDown(e:KeyboardEvent):void {

switch(e.keyCode) {

case Keyboard.DOWN:

jj.y += 5;

break;

case Keyboard.UP:

jj.y -= 5;

break;

case Keyboard.RIGHT:

jj.x += 5;

break;

case Keyboard.LEFT:

jj.x -= 5;

break;

trace("keyCode: ", e.keyCode);

}

if(e.keyCode == 87) { //w-87, a-65, s-83, d-68

jj.y -= 5;

}

if(e.keyCode == 83) {

jj.y += 5;

}

if(e.keyCode == 65) {

jj.x -= 5;

}

if(e.keyCode == 68) {

jj.x += 5;

}

}

[ym54]

hello?

[samac1068]

What you are using are keyboard listeners. As I mentioned above, there are different types of listeners, some will listener for events from the keyboard, others from the mouse, you even have listeners to look for a file to complete loading.

In any case, a listener is just a piece of code that is directed to wait for a specific event. For example, a mouse listener

obj.addEventListener(MouseEvent.CLICK, something)

This will keep an eye out for the mouse to be click on the specific object (obj), and when it does it fairs off an event to the specific function (something). They are extremely handy when you want your application to perform a task based on a mouse or keyboard action.