cocos2d subclassing sprite to handle touch? - cocos2d-iphone

Question

I'm new to the cocos2d(-x) world.
I'd like to detect a touch to a sprite, and tutorials/examples seem to suggest using layer to detect touch and find the approapriate sprite with bounding box.
Is subclassing sprite to allow touch detection generally a bad idea?

Answer 1

Note: This answer might be outdated. I answered this at 2012.
It is not a bad idea. Here is how I do it:
header file:
#include "cocos2d.h"
using namespace cocos2d;
class TouchableSprite : public cocos2d::CCSprite, public CCTargetedTouchDelegate {
public:
virtual void onEnter();
virtual void onExit();
virtual bool ccTouchBegan(CCTouch* touch, CCEvent* event);
virtual void ccTouchMoved(CCTouch* touch, CCEvent* event);
virtual void ccTouchEnded(CCTouch* touch, CCEvent* event);
};
cpp file:
#include "TouchableSprite.h"
void TouchableSprite::onEnter(){
// before 2.0:
// CCTouchDispatcher::sharedDispatcher()->addTargetedDelegate(this, 0, true);
// since 2.0:
CCDirector::sharedDirector()->getTouchDispatcher()->addTargetedDelegate(this, 0, true);
CCSprite::onEnter();
}
void TouchableSprite::onExit(){
// before 2.0:
// CCTouchDispatcher::sharedDispatcher()->removeDelegate(this);
// since 2.0:
CCDirector::sharedDirector()->getTouchDispatcher()->removeDelegate(this);
CCSprite::onExit();
}
bool TouchableSprite::ccTouchBegan(CCTouch* touch, CCEvent* event){
//do whatever you want here
return true;
}
void TouchableSprite::ccTouchMoved(CCTouch* touch, CCEvent* event){
//do what you want
}
void TouchableSprite::ccTouchEnded(CCTouch* touch, CCEvent* event){
//do your job here
}

Answer 2

In cocos2d-x 3.0 alpha you can try this:
auto listener = EventListenerTouchOneByOne::create();
listener->setSwallowTouches(true);
listener->onTouchBegan = [&](Touch* touch, Event* event){
if (this->getBoundingBox().containsPoint(this->convertTouchToNodeSpace(touch))) {
return true;
}
return false;
};
Director::getInstance()->getEventDispatcher()->addEventListenerWithSceneGraphPriority(listener, this);

Answer 3

it is better and much more clear to handle touches in one place. but i think, no one can bar you to do this

Answer 4

You do not need to subclass sprites to detect touch.
Here, Follow this LINK its a nice place to get started with Cocos2d