Is it possible to get events (subscribe) from certain sprite?

cocos2d-x
#1

I want to check my physicsbody sprite is resting.
Instead manually checking sprite isResting, sprite should emit resting event.
Does sprites can emit events?

#2

Hi. You can use Custom Events anywhere you need. Custom Events has a user data property that can be anything (in your case your sprite).

for example:
auto mySprite = Sprite::create(“myImage”);
Director::getInstance()->getEventDispatcher()->dispatchCustomEvent(“myEventName”, &mySprite);

and somewhere else you need a EventListenerCustom for this event.

Search the Doc for move info.

1 Like
#3

thank you I will try this

#4

I googled but there is no result for dispatchCustomEvent implementation.

and dispatchCustomEvent second argument is userData not sprite.
I am guessing there is no support getting events for certain sprite otherwise tons of post should be somewhere

#5

Hi. the userDate is a Void Pointer. The Void Pointer can be anything (include sprites).

This is example of EventListenerCustom.

 auto myListener = EventListenerCustom::create("myEventName", [this](EventCustom*        event)
{
	auto mySprite = static_cast<Sprite*>(event->getUserData());
//.      now you have access to mySprite and doing stuff.
	
});

_eventDispatcher->addEventListenerWithSceneGraphPriority(myListener, this);
1 Like
#6

Cocos event system is very generic and useful.
You can sent custom events in any lines of code and listen those events in any lines of code in any class.

#7

I got it thank you, but I point different thing, can i get event when sprite scaled or rotated?

I think cocos2d-x not automatically firing events from sprites to let us subscribe to this events when we need.

#8

use a custom event and set your own flags to fire it? We don’t have built-in events for every single transformation that you can possible do.

#9

thank you. I will manually dispatch event