CODEWITHSUNDEEP
libgdx
OMGPOP
OMGPOP

Reputation: 984

libGDX what's the difference between InputListener, InputProcessor, InputAdapter

I am a bit confused about touch handling of libGDX. I have seen the usage of all three types.

InputProcessor: http://www.gamefromscratch.com/post/2013/10/24/LibGDX-Tutorial-5-Handling-Input-Touch-and-gestures.aspx

public class InputDemo2 implements ApplicationListener, InputProcessor {
    @Override
    public void create() {        
        Gdx.input.setInputProcessor(this);
    }


    @Override
    public boolean touchDown(int screenX, int screenY, int pointer, int button) {
    }
}

InputListener here: http://www.gamefromscratch.com/post/2013/11/27/LibGDX-Tutorial-9-Scene2D-Part-1.aspx

    public MyActor(){
        setBounds(actorX,actorY,texture.getWidth(),texture.getHeight());
        addListener(new InputListener(){
            public boolean touchDown (InputEvent event, float x, float y, int pointer, int button) {
                ((MyActor)event.getTarget()).started = true;
                return true;
            }
        });
    }

InputAdapter here: LibGdx, How to handle touch event?

public class Prac1 extends ApplicationAdapter {
    @Override
    public void create () {
        Gdx.input.setInputProcessor(new InputAdapter(){
            @Override
            public boolean touchDown(int screenX, int screenY, int pointer, int button) {
                return true;
            }

        });
    }
}

I don't find one different from another. Which one should I use?

Upvotes: 2

Views: 2463

Answers (1)

AAryan
AAryan

Reputation: 20140

InputListener

InputListener is an EventListener for low-level input events that is provided for receiving and handling InputEvents.

EventListener is an interface with a handle(Event) method that are added to actors to be notified about events. Classes that implement the EventListener interface use instanceof to determine whether they should handle the event.

An actor just needs to add an InputListener to start receiving input events.

InputProcessor

An InputProcessor is used to receive input events from the keyboard and the touch screen (mouse on the desktop). For this it has to be registered with the Input.setInputProcessor(InputProcessor) method. It will be called each frame before the call to ApplicationListener.render().

InputAdapter

InputAdapter is just an adapter class for InputProcessor. If you want to override only some methods that you're interested in, use this class.

Upvotes: 5

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