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(, , ) );

         sprite2->setOpacity( (GLubyte)(*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, , 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(, size.height/);

     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(, size.height/);

     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。