Newbie: Delete CCLabelTTF created in main from inside of a function?

cocos2d-x C++
#1

Hi. This is probably a very basic question, but I am getting stuck for whatever reason, and I would appreciate your help.

I created this button as part of a menu.

auto mButton = MenuItemFont::create(buttonLabel, CC_CALLBACK_0(SecondScene::Buttonpress, this));
auto menu = Menu::create(back, okay, mButton, main, NULL);

void SecondScene::Buttonpress()
{
//delete mButton
}

I want mButton to be deleted when SecondScene::Buttonpress is called, but I don’t know how to include it in the scope of the function using CC_Callback. Could anyone provide me with a brief explanation of how to do this?

#2

Why don’t you create mButton in the header, then you can access it from every function in the .cpp?

#3

Just to clear things up a little bit here. You shouldn’t create mButton in the header.
But you could however define a pointer to the button in private or protected in your scene’s class definition.

For example like this:
in SecondScene.h

class SecondScene : public cocos2d::Layer
{
protected:
	cocos2d::MenuItemFont* _mButton {nullptr};

Then you create your button and menu as usual in the function body of your choice, for example in bool SecondScene::init()

	_mButton  = MenuItemFont::create(buttonLabel, CC_CALLBACK_0(SecondScene::Buttonpress, this));
	auto menu = Menu::create(back, okay, _mButton, main, nullptr);

And void SecondScene::Buttonpress() could look like this:

void SecondScene::Buttonpress()
{
	_mButton->removeFromParent();
	_mButton = nullptr;
}

BUT: Far more elegant would be to use a lambda function:
Forget defining the pointer in the header, delete you Buttonpress method.
Just create your menu like this:

auto mButton  = MenuItemFont::create(buttonLabel, [](Ref *sender){
	static_cast<Node*>(sender)->removeFromParent();
});
auto menu = Menu::create(back, okay, mButton, main, nullptr);
```

BTW: I'm assuming `buttonLabel` is a std::string. Isn't it a little bit confusing to call a `string` a `Label` ;-)
#4

Your pointer method worked for me, and I really should have thought of that myself. I’ll do some research about the second solution. Also, yes, it is a std::String :slight_smile: I guess it is pretty confusing.