项目须要。写一个类似于iPhone上面时钟选择的可拉动式循环选择列表，通过集成CCScrollView并更改部分代码。实现了该功能。
不考虑重构，这是我写的第一版代码，仅仅考虑了功能性。
过两天有时间后。我会将该部分代码重构，希望大家作对照~
#include "cocos2d.h"
#include "cocos-ext.h"
using namespace cocos2d;
using namespace cocos2d::extension;
#define SCROLL_DEACCEL_RATE 0.95f
#define SCROLL_DEACCEL_DIST 1.0f
enum MovingDirection
{
Left = 1,
Right = 2,
Up,
Down
};
enum Direction
{
CycleDirectionHorizontal=1,
CycleDirectionVertical
};
enum Child
{
kLeft = 1,
kMiddle,
kRight
};
class CCCycleScrollView: public CCScrollView
{
public:
CCCycleScrollView();
virtual ~CCCycleScrollView();
static CCCycleScrollView* create(const char* spriteFile,Direction direction = CycleDirectionHorizontal);
bool initWithViewSize(const char* spriteFile ,Direction direction = CycleDirectionHorizontal);
bool ccTouchBegan(CCTouch *pTouch, CCEvent *pEvent);
void ccTouchMoved(CCTouch *pTouch, CCEvent *pEvent);
void ccTouchEnded(CCTouch *pTouch, CCEvent *pEvent);
protected:
//调整三个sprite的位置
void adjustSprite();
void deaccelerateScrolling(float dt);
void relocateContainer();
CCPoint findEndPoint();
//有三个一样的sprite来支持循环显示
CCSprite* m_sprite1;
CCSprite* m_sprite2;
CCSprite* m_sprite3;
//每一个sprite的size
CCSize m_spriteSize;
//上一次触碰点的坐标。用于推断当前移动的方向
CCPoint m_lastPoint;
//当前触碰点的坐标
CCPoint m_nowPoint;
//当前偏移相应的位置
float m_nowPositionNum;
//上一次移动后的移动位数
int m_lastPositionNum;
//上一次正向移动是否移动过
bool m_lastPositiveDone;
//上一次反向移动是否移动过
bool m_lastNegtiveDone;
//正在移动的方向
MovingDirection m_moving;
//滚动的限定方向
Direction m_direction;
//temp
CCLabelTTF* temp1;
CCLabelTTF* temp2;
CCLabelTTF* temp3;
CCLabelTTF* temp4;
CCLabelTTF* temp5;
CCLabelTTF* temp6;
CCLabelTTF* temp7;
CCLabelTTF* temp8;
CCLabelTTF* temp9;
void updateTemp();
};
#include "CCCycleScrollView.h"
CCCycleScrollView::CCCycleScrollView():
m_sprite1(NULL),
m_sprite2(NULL),
m_sprite3(NULL),
m_lastPoint(ccp(0.0f,0.0f)),
m_nowPoint(ccp(0.0f,0.0f)),
m_lastPositionNum(0),
m_lastPositiveDone(false),
m_lastNegtiveDone(false)
{
}
CCCycleScrollView::~CCCycleScrollView()
{
}
bool CCCycleScrollView::initWithViewSize(const char* spriteFile ,Direction d )
{
if (CCLayer::init())
{
m_sprite1 = CCSprite::create(spriteFile);
m_sprite1->ignoreAnchorPointForPosition(false);
m_sprite1->setAnchorPoint(ccp(0.0f,0.0f));
CCSize spriteSize = m_sprite1->getContentSize();
temp1 = CCLabelTTF::create();
temp1->setContentSize(CCSizeMake(160,320));
temp1->setFontSize(80);
temp1->setAnchorPoint(ccp(0.5f,0.0f));
temp1->setString("10");
temp1->setPosition(ccp(80.0f,0.0f));
temp1->setTag(kLeft);
m_sprite1->addChild(temp1);
temp2 = CCLabelTTF::create();
temp2->setContentSize(CCSizeMake(160,320));
temp2->setFontSize(80);
temp2->setAnchorPoint(ccp(0.5f,0.0f));
temp2->setString("11");
temp2->setPosition(ccp(240.f,0.0f));
temp2->setTag(kMiddle);
m_sprite1->addChild(temp2);
temp3 = CCLabelTTF::create();
temp3->setContentSize(CCSizeMake(160,320));
temp3->setFontSize(80);
temp3->setAnchorPoint(ccp(0.5f,0.0f));
temp3->setString("12");
temp3->setPosition(ccp(400.0f,0.0f));
temp3->setTag(kRight);
m_sprite1->addChild(temp3);
m_sprite2 = CCSprite::create(spriteFile);
m_sprite2->ignoreAnchorPointForPosition(false);
m_sprite2->setAnchorPoint(ccp(0.0f,0.0f));
temp4 = CCLabelTTF::create();
temp4->setContentSize(CCSizeMake(160,320));
temp4->setFontSize(80);
temp4->setAnchorPoint(ccp(0.5f,0.0f));
temp4->setString("1");
temp4->setPosition(ccp(80.0f,0.0f));
temp4->setTag(kLeft);
m_sprite2->addChild(temp4);
temp5 = CCLabelTTF::create();
temp5->setContentSize(CCSizeMake(160,320));
temp5->setFontSize(80);
temp5->setAnchorPoint(ccp(0.5f,0.0f));
temp5->setString("2");
temp5->setPosition(ccp(240.0f,0.0f));
temp5->setTag(kMiddle);
m_sprite2->addChild(temp5);
temp6 = CCLabelTTF::create();
temp6->setContentSize(CCSizeMake(160,320));
temp6->setFontSize(80);
temp6->setAnchorPoint(ccp(0.5f,0.0f));
temp6->setString("3");
temp6->setPosition(ccp(400.0f,0.0f));
temp6->setTag(kRight);
m_sprite2->addChild(temp6);
m_sprite3 = CCSprite::create(spriteFile);
m_sprite3->ignoreAnchorPointForPosition(false);
m_sprite3->setAnchorPoint(ccp(0.0f,0.0f));
temp7 = CCLabelTTF::create();
temp7->setContentSize(CCSizeMake(160,320));
temp7->setFontSize(80);
temp7->setAnchorPoint(ccp(0.5f,0.0f));
temp7->setString("4");
temp7->setPosition(ccp(80.f,0.0f));
temp7->setTag(kLeft);
m_sprite3->addChild(temp7);
temp8 = CCLabelTTF::create();
temp8->setContentSize(CCSizeMake(160,320));
temp8->setFontSize(80);
temp8->setAnchorPoint(ccp(0.5f,0.0f));
temp8->setString("5");
temp8->setPosition(ccp(240.0f,0.0f));
temp8->setTag(kMiddle);
m_sprite3->addChild(temp8);
temp9 = CCLabelTTF::create();
temp9->setContentSize(CCSizeMake(160,320));
temp9->setFontSize(80);
temp9->setAnchorPoint(ccp(0.5f,0.0f));
temp9->setString("6");
temp9->setPosition(ccp(400.0f,0.0f));
temp9->setTag(kRight);
m_sprite3->addChild(temp9);
if (d==CycleDirectionHorizontal)
{
m_sprite1->setPosition(ccp(-spriteSize.width,0.0f));
m_sprite2->setPosition(ccp(0.0f,0.0f));
m_sprite3->setPosition(ccp(spriteSize.width,0.0f));
m_eDirection = kCCScrollViewDirectionHorizontal;
}
else if(d==CycleDirectionVertical)
{
m_sprite1->setPosition(ccp(0.0f,-spriteSize.height));
m_sprite2->setPosition(ccp(0.0f,0.0f));
m_sprite3->setPosition(ccp(0.0f,spriteSize.height));
m_eDirection = kCCScrollViewDirectionVertical;
}
if (!this->m_pContainer)
{
m_pContainer = CCLayer::create();
this->m_pContainer->ignoreAnchorPointForPosition(false);
this->m_pContainer->setAnchorPoint(ccp(0.0f, 0.0f));
this->m_pContainer->addChild(m_sprite1);
this->m_pContainer->addChild(m_sprite2);
this->m_pContainer->addChild(m_sprite3);
}
this->setViewSize(CCSizeMake(spriteSize.width,spriteSize.height));
setTouchEnabled(true);
m_pTouches = new CCArray();
m_pDelegate = NULL;
m_bBounceable = true;
m_bClippingToBounds = true;
//m_pContainer->setContentSize(CCSizeZero);
m_pContainer->setPosition(ccp(0.0f, 0.0f));
m_fTouchLength = 0.0f;
this->addChild(m_pContainer);
//setContentOffset(ccp(-spriteSize.width,0));
/*
m_fMaxInset = ccp(spriteSize.width*300,0);
m_fMinInset = ccp(-spriteSize.width*300,0);
m_bBounceable = true;
*/
m_fMinScale = m_fMaxScale = 1.0f;
m_spriteSize = spriteSize;
m_direction = d;
return true;
}
return false;
}
CCCycleScrollView* CCCycleScrollView::create( const char* spriteFile ,Direction d)
{
CCCycleScrollView* pRet = new CCCycleScrollView();
if (pRet && pRet->initWithViewSize(spriteFile,d))
{
pRet->autorelease();
}
else
{
CC_SAFE_DELETE(pRet);
}
return pRet;
}
void CCCycleScrollView::ccTouchEnded( CCTouch *pTouch, CCEvent *pEvent )
{
if (!this->isVisible())
{
return;
}
if (m_pTouches->count()==1)
{
this->schedule(schedule_selector(CCCycleScrollView::deaccelerateScrolling));
}
m_pTouches->removeObject(pTouch);
//没有touch时。须要设置状态
if (m_pTouches->count() == 0)
{
m_bDragging = false;
m_bTouchMoved = false;
}
}
void CCCycleScrollView::ccTouchMoved( CCTouch *pTouch, CCEvent *pEvent )
{
CCScrollView::ccTouchMoved(pTouch,pEvent);
m_nowPoint = convertToWorldSpace(convertTouchToNodeSpace(pTouch));
CCLog("The last point is %f",m_lastPoint.x);
CCLog("The now point is %f",m_nowPoint.x);
if (m_direction==CycleDirectionHorizontal)
{
if (m_nowPoint.x>m_lastPoint.x)
{
m_moving = Right;
m_lastPoint = m_nowPoint;
}
else
{
m_moving= Left;
m_lastPoint = m_nowPoint;
}
m_nowPositionNum = m_pContainer->getPositionX() / m_spriteSize.width;
//CCLog("The nowNum is %d",nowPositionNum);
CCLog("The offset is %f",m_pContainer->getPositionX());
CCLog("The 1 is %f",m_sprite1->getPositionX());
CCLog("The 2 is %f",m_sprite2->getPositionX());
CCLog("The 3 is %f",m_sprite3->getPositionX());
CCLog("The move is %d",m_moving);
}else if (m_direction==CycleDirectionVertical)
{
if (m_nowPoint.y>m_lastPoint.y)
{
m_moving = Up;
m_lastPoint = m_nowPoint;
}
else
{
m_moving= Down;
m_lastPoint = m_nowPoint;
}
m_nowPositionNum = m_pContainer->getPositionY() / m_spriteSize.height;
}
adjustSprite();
}
bool CCCycleScrollView::ccTouchBegan( CCTouch *pTouch, CCEvent *pEvent )
{
bool result = CCScrollView::ccTouchBegan(pTouch,pEvent);
m_lastPoint = convertToWorldSpace(convertTouchToNodeSpace(pTouch));
CCLog("The last point is %f",m_lastPoint.x);
if (m_pTouches->count()>1)
{
return false;
}
return result;
}
void CCCycleScrollView::adjustSprite()
{
//正在向右移动
if (m_direction==CycleDirectionHorizontal)
{
if (m_moving==Right)
{
if (m_nowPositionNum-m_lastPositionNum>0.5)
{
m_lastPositiveDone=true;
m_lastPositionNum++;
}
//
if (m_lastPositiveDone)
{
m_sprite3->setPosition(ccp(m_sprite3->getPositionX()-m_spriteSize.width*3,0));
CCSprite* temp = m_sprite3;
m_sprite3 = m_sprite2;
m_sprite2 = m_sprite1;
m_sprite1 = temp;
updateTemp();
m_lastPositiveDone = false;
}
}
else if (m_moving==Left)
{
if (m_lastPositionNum-m_nowPositionNum>=0.5)
{
m_lastNegtiveDone=true;
m_lastPositionNum--;
}
if (m_lastNegtiveDone)
{
m_sprite1->setPosition(ccp(m_sprite1->getPositionX()+m_spriteSize.width*3,0));
CCSprite* temp = m_sprite1;
m_sprite1 = m_sprite2;
m_sprite2 = m_sprite3;
m_sprite3 = temp;
updateTemp();
m_lastNegtiveDone=false;
}
}
}else if (m_direction==CycleDirectionVertical)
{
if (m_moving==Up)
{
if (m_nowPositionNum-m_lastPositionNum>0.5)
{
m_lastPositiveDone=true;
m_lastPositionNum++;
}
if (m_lastPositiveDone)
{
m_sprite3->setPosition(ccp(0.0f,m_sprite3->getPositionY()-m_spriteSize.height*3));
CCSprite* temp = m_sprite3;
m_sprite3 = m_sprite2;
m_sprite2 = m_sprite1;
m_sprite1 = temp;
m_lastPositiveDone = false;
}
}
else if (m_moving==Down)
{
if (m_lastPositionNum-m_nowPositionNum>=0.5)
{
m_lastNegtiveDone=true;
m_lastPositionNum--;
}
if (m_lastNegtiveDone)
{
m_sprite1->setPosition(ccp(0.0f,m_sprite1->getPositionY()+m_spriteSize.height*3));
CCSprite* temp = m_sprite1;
m_sprite1 = m_sprite2;
m_sprite2 = m_sprite3;
m_sprite3 = temp;
m_lastNegtiveDone=false;
}
}
}
}
void CCCycleScrollView::updateTemp()
{
if (m_moving==Right)
{
int num = atoi(((CCLabelTTF*)m_sprite2->getChildByTag(kLeft))->getString());
if (num-1==0)
{
num=13;
}
((CCLabelTTF*)m_sprite1->getChildByTag(kLeft))->setString(CCString::createWithFormat("%d",num-3)->getCString());
((CCLabelTTF*)m_sprite1->getChildByTag(kMiddle))->setString(CCString::createWithFormat("%d",num-2)->getCString());
((CCLabelTTF*)m_sprite1->getChildByTag(kRight))->setString(CCString::createWithFormat("%d",num-1)->getCString());
}
else if (m_moving==Left)
{
int num = atoi(((CCLabelTTF*)m_sprite2->getChildByTag(kRight))->getString());
if (num+1==13)
{
num=0;
}
((CCLabelTTF*)m_sprite3->getChildByTag(kLeft))->setString(CCString::createWithFormat("%d",num+1)->getCString());
((CCLabelTTF*)m_sprite3->getChildByTag(kMiddle))->setString(CCString::createWithFormat("%d",num+2)->getCString());
((CCLabelTTF*)m_sprite3->getChildByTag(kRight))->setString(CCString::createWithFormat("%d",num+3)->getCString());
}
}
void CCCycleScrollView::deaccelerateScrolling(float dt)
{
//假设刚好在帧開始前 又有一个触摸点发生了began，造成了滚动状态，则取消并返回
if (m_bDragging)
{
this->unschedule(schedule_selector(CCCycleScrollView::deaccelerateScrolling));
return;
}
//好玩的东西来咯
float newX, newY;
CCPoint maxInset, minInset;
//CCLOG("The end distance is %f",m_tScrollDistance.x);
//这里我不清楚为啥要出来。我用输出发如今move中。已经将此offset设置过了，不知为何还要设置，求大神解答。
m_pContainer->setPosition(ccpAdd(m_pContainer->getPosition(), m_tScrollDistance));
newX = m_pContainer->getPosition().x;
newY = m_pContainer->getPosition().y;
m_tScrollDistance = ccpSub(m_tScrollDistance, ccp(newX - m_pContainer->getPosition().x, newY - m_pContainer->getPosition().y));
m_tScrollDistance = ccpMult(m_tScrollDistance, SCROLL_DEACCEL_RATE);
this->setContentOffset(ccp(newX,newY));
if (m_direction==CycleDirectionHorizontal)
{
m_nowPositionNum = m_pContainer->getPositionX() / m_spriteSize.width;
}else if (m_direction==CycleDirectionVertical)
{
m_nowPositionNum = m_pContainer->getPositionY() / m_spriteSize.height;
}
this->adjustSprite();
if ((fabsf(m_tScrollDistance.x) <= SCROLL_DEACCEL_DIST &&
fabsf(m_tScrollDistance.y) <= SCROLL_DEACCEL_DIST))
{
this->unschedule(schedule_selector(CCCycleScrollView::deaccelerateScrolling));
//CCLog("stop!!!!");
this->relocateContainer();
}
}
void CCCycleScrollView::relocateContainer()
{
//调整位置
m_pContainer->setPosition(findEndPoint());
if (m_direction==CycleDirectionHorizontal)
{
m_nowPositionNum = m_pContainer->getPositionX() / m_spriteSize.width;
}else if (m_direction==CycleDirectionVertical)
{
m_nowPositionNum = m_pContainer->getPositionY() / m_spriteSize.height;
}
this->adjustSprite();
}
cocos2d::CCPoint CCCycleScrollView::findEndPoint()
{
CCPoint nowPoint;
nowPoint.x = m_pContainer->getPositionX();
float interval = (nowPoint.x)/160;
int inter = (int)interval;
CCPoint newPoint;
if (fabsf(interval-inter)>=0.5)
{
if (inter<0)
{
newPoint.x = 160*(inter-1);
}
else
{
newPoint.x = 160*(inter+1);
}
}
else
{
newPoint.x = 160*inter;
}
CCLog("The final offset is %f",nowPoint.x);
CCLog("The float is %f , the int is %d",interval,inter);
CCLog("The endpoint is %f",newPoint.x);
return ccp(newPoint.x,0.0f);
}
未重构的代码有些恶心~~
准备将重构后的代码再贴出来，并放在github上以供大家下载測试。
本文章为转载内容，我们尊重原作者对文章享有的著作权。如有内容错误或侵权问题，欢迎原作者联系我们进行内容更正或删除文章。
