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。