cocos2d-x学习记录6——自定义Button

cocos2d-x中封装CCMenuItem等相关按钮，但是有些时候需要自己封装按钮，这样能够更加灵活的实现对应功能。

自定义Button，需要重写OnEnter()和onExit()函数，并在对应函数中添加注册和取消注册。

BaseButton.h内容

#ifndef BaseButton_H_H
#define BaseButton_H_H

#include "cocos2d.h"
using namespace cocos2d;

typedef SEL_CallFunc v_callback;

class BaseButton : public CCNodeRGBA, public CCTargetedTouchDelegate
{
public:
    BaseButton() : sprite1(NULL), sprite2(NULL), curSprite(NULL), downCallback(NULL), moveCallback(NULL), upCallback(NULL) {}
    static BaseButton* create(const char* pszFileName1, const char* pszFileName2, v_callback upCallback0);
    virtual bool initWithFile(const char* pszFileName1, const char* pszFileName2, v_callback upCallback0);

    virtual void onEnter();
    virtual void onExit();
    
    virtual bool ccTouchBegan(CCTouch *pTouch, CCEvent *pEvent);
    virtual void ccTouchMoved(CCTouch *pTouch, CCEvent *pEvent);
    virtual void ccTouchEnded(CCTouch *pTouch, CCEvent *pEvent);
    //virtual void ccTouchCancelled(CCTouch *pTouch, CCEvent *pEvent);

    void downHand();

    virtual void update();

private:
    CCSprite *sprite1, *sprite2, *curSprite;
    //vCallback downCallback, moveCallback, upCallback; 
    //void (*downCallback)(void);
    void (*moveCallback)(void);
    //void (*upCallback)(void);
    v_callback downCallback;
    v_callback upCallback;
};

#endif

BaseButton.cpp内容

#include "BaseButton.h"

BaseButton* BaseButton::create(const char* pszFileName1, const char* pszFileName2, v_callback upCallback0)
{
    BaseButton *button = new BaseButton();
    if(button && button->initWithFile(pszFileName1, pszFileName2, upCallback0)){
        button->autorelease();
        return button;
    }
    CC_SAFE_DELETE(button);
    return NULL;
}

bool BaseButton::initWithFile(const char* pszFileName1, const char* pszFileName2, v_callback upCallback0)
{
    if( !CCNodeRGBA::init() ){
        return false;
    }
    if(pszFileName1 == NULL){
        return false;
    }

    sprite1 = CCSprite::create( pszFileName1 );
    CCSize size = sprite1->getContentSize();
    if(pszFileName2 != NULL){
        sprite2 = CCSprite::create( pszFileName2 );
    }
    else{
        sprite2 = CCSprite::create( pszFileName1 );
        sprite2->setColor( ccc3(0, 0, 0) );
        sprite2->setOpacity( (GLubyte)(255*0.7) );
    }
    sprite2->setVisible(false);
    sprite2->setScaleX(size.width/sprite2->getContentSize().width);
    sprite2->setScaleY(size.height/sprite2->getContentSize().height);
    addChild(sprite1);
    addChild(sprite2);
    curSprite = sprite1;

    downCallback = (SEL_CallFunc)(&BaseButton::downHand);
    upCallback = upCallback0;

    scheduleUpdate();

    return true;
}

void BaseButton::onEnter()
{
    CCDirector::sharedDirector()->getTouchDispatcher()->addTargetedDelegate(this, 0, true);
}

void BaseButton::onExit()
{
    CCDirector::sharedDirector()->getTouchDispatcher()->removeDelegate(this);
}

bool BaseButton::ccTouchBegan(CCTouch* pTouch, CCEvent *pEvent)
{
    //CCPoint point = pTouch->getLocation();
    CCPoint point = this->convertTouchToNodeSpaceAR(pTouch);
    if( sprite1->boundingBox().containsPoint(point) ){
        if(downCallback != NULL){
            (this->*downCallback)();
        }
        return true;
    }
    return false;
}

void BaseButton::ccTouchMoved(CCTouch *pTouch, CCEvent *pEvent)
{
    if(moveCallback != NULL){
        moveCallback();
    }
}

void BaseButton::ccTouchEnded(CCTouch *pTouch, CCEvent *pEvent)
{
    sprite2->setVisible(false);
    sprite1->setVisible(true);
    if(upCallback != NULL){
        //upCallback();
        (this->*upCallback)();
    }
    //CCMessageBox("Up", "Info");
}

void BaseButton::downHand()
{
    sprite1->setVisible(false);
    sprite2->setVisible(true);
}

void BaseButton::update()
{

}

MyScene.h内容

#ifndef MyScene_H_H
#define MyScene_H_H

#include "cocos2d.h"
using namespace cocos2d;



class MyScene : public CCLayer
{
public:
    static CCScene* createScene();
    virtual bool init();
    CREATE_FUNC( MyScene );

    void upCallback();


private:
};


#endif

MyScene.cpp内容

#include "MyScene.h"
#include "BaseButton.h"


CCScene* MyScene::createScene()
{
    CCScene *scene = CCScene::create();
    MyScene *layer = MyScene::create();
    scene->addChild(layer);
    return scene;
};


bool MyScene::init()
{
    if( !CCLayer::init() ){
        return false;
    }

    CCSize size = CCDirector::sharedDirector()->getWinSize();

    BaseButton *button = BaseButton::create("pal_2.png", "pal_3.png", (v_callback)(&MyScene::upCallback1) );
    button->setAnchorPoint(ccp(0.5, 0.5));
    button->setPosition(100, size.height/2);
    button->setScale(0.25f);
    addChild(button);

    BaseButton *button2 = BaseButton::create("pal_2.png", "pal_3.png", (v_callback)(&MyScene::upCallback2) );
    button2->setAnchorPoint(ccp(0.5, 0.5));
    button2->setPosition(300, size.height/2);
    button2->setScale(0.25f);
    addChild(button2);


    return true;
}

void MyScene::upCallback1()
{
    CCMessageBox("Up1", "Info");
}

void MyScene::upCallback2()
{
    CCMessageBox("Up2", "Info");
}

运行结果：

这里的button响应函数使用的是成员函数指针，需要通过对象进行使用，如(this->*upCallback)()。

而普通的函数指针则需要是static函数，成员函数则会出现错误。