cocos2d how do I prevent multi touch propagation to previous layers?

Question

I'm handling the touches manualy through a class that holds every touchable sprite. Also, every menu is a CCLayer, and when I change from one menu to the other, I use the CCTransition### and get the new scene.

So, the layers are "still there" and when I touch one menu, the previous layer also receive it... like when I start the game in a new CCLayer, and then the menus are still affected for the multi touch...

If I use single touch, I can swallow the touches, but the game must have multi touch...

What can I do? Thank you all!

score 1 · Accepted Answer · edited May 05 '12 at 08:21

You need to consume the touch event in whatever layer needs it. After a layer consumes it, the touch will no longer be propagated to "previous" layers.

http://www.cocos2d-iphone.org/api-ref/0.9.0-beta/_c_c_touch_delegate_protocol_8h_source.html

To consume a touch event, you return YES in the ccTouchBegan delegate method.

EDIT: changed method name to match CCStandardTouchDelegate

- (BOOL)ccTouchesBegan:(NSSet *)touches withEvent:(UIEvent *)event;
   if (condition)
      return YES;
   else 
      return NO;
}

score 1 · Answer 2 · answered May 07 '12 at 04:33

1

You can set up the priority to 0 for the top layer and priority to 1 for the layer under it like this.

[[CCTouchDispatcher sharedDispatcher] addTargetedDelegate:self priority:0 swallowsTouches:YES];

answered May 07 '12 at 04:33

Emmy

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score 0 · Answer 3 · edited May 05 '12 at 08:21

0

You could try to use the property

self.isTouchEnabled = NO;

within the layer, you don't want to receive touches.

If you you use CCButton objects you need to disable them.

I hope it helps...

Greetings Anselm

edited May 05 '12 at 08:21

Hailei

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answered May 03 '12 at 18:13

Anselm Scholz

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cocos2d how do I prevent multi touch propagation to previous layers?

3 Answers3