本文的实现是參照我之前在做iOS时实现的一个能够循环的列表这里用C++重写一遍。
效果：
用法：能够使用创建project时的HelloWorld測试
,h文件里加入循环列表的监听回调
void djInfiniteScroll(Ref* sender);
.cpp
#include "DJInfiniteScrollPicker.h"
DJInfiniteScrollPicker* picker = DJInfiniteScrollPicker::create(); picker->setSize(Size(500, 500)); picker->imageAry = set1; picker->setPosition(Point(10, 100)); picker->setBackGroundColorType(cocos2d::ui::LAYOUT_COLOR_SOLID); picker->setBackGroundColor(Color3B(128, 128, 128)); picker->initInfiniteScrollView(); addChild(picker); picker->addEventDJInifiteScrollPicker(this, djInfinitescrollvieweventselector(TestScene::djInfiniteScroll));实现类：
DJInfiniteScrollPicker.h
//// DJInfiniteScrollPicker.h// maptest//// Created by 杜甲 on 14-5-27.////#ifndef __maptest__DJInfiniteScrollPicker__#define __maptest__DJInfiniteScrollPicker__#include "cocos2d.h"#include "ui/CocosGUI.h"#include "extensions/cocos-ext.h"USING_NS_CC;typedef enum{ sc = 0, sc1}ScType;typedef void (Ref::*SEL_InfiniteScrollViewEvent)(Ref*);#define djInfinitescrollvieweventselector(_SELECTOR) (SEL_InfiniteScrollViewEvent)(&_SELECTOR)class DJInfiniteScrollPicker:public ui::Layout,public extension::ScrollViewDelegate{ public: CREATE_FUNC(DJInfiniteScrollPicker); virtual bool init(); static DJInfiniteScrollPicker* create(Size wsize); virtual bool initWithSize(Size wsize); virtual void scrollViewDidScroll(extension::ScrollView* view); /** * @js NA * @lua NA */ virtual void scrollViewDidZoom(extension::ScrollView* view); void initInfiniteScrollView(); extension::ScrollView* infiniteScrollView; std::vector imageAry; Size itemSize; float alphaOfobjs; float heightOffset; float positionRatio; void addEventDJInifiteScrollPicker(Ref* sender,SEL_InfiniteScrollViewEvent type); private: std::vector imageStore; float beforePointX; std::string fontName; void reloadView(float offset); void snapToAnEmotion(); Sprite* currSprite; bool isFirstDrag; int currNum; Ref* _infiniteEventListener; SEL_InfiniteScrollViewEvent _infiniteEventSelector; };#endif /* defined(__maptest__DJInfiniteScrollPicker__) */ DJInfiniteScrollPicker.cpp
//// DJInfiniteScrollPicker.cpp// maptest//// Created by 杜甲 on 14-5-27.////#include "DJInfiniteScrollPicker.h"bool DJInfiniteScrollPicker::init(){ bool bRet = false; do { CC_BREAK_IF(!ui::Layout::init()); bRet = true; } while (0); return bRet;}DJInfiniteScrollPicker* DJInfiniteScrollPicker::create(Size size){ DJInfiniteScrollPicker* pRet = new DJInfiniteScrollPicker(); if (pRet && pRet->initWithSize(size)) { pRet->autorelease(); } else { CC_SAFE_DELETE(pRet); } return pRet;}bool DJInfiniteScrollPicker::initWithSize(cocos2d::Size size){ bool bRet = false; do { CC_BREAK_IF(!ui::Layout::init()); bRet = true; } while (0); return bRet;}void DJInfiniteScrollPicker::initInfiniteScrollView(){ isFirstDrag = false; fontName = "TrebuchetMS-Bold"; alphaOfobjs = 1.0f; heightOffset = 0.0f; positionRatio = 1.0f; beforePointX = 0.0f; infiniteScrollView = extension::ScrollView::create(getSize()); infiniteScrollView->retain(); infiniteScrollView->setPosition(Point(0, 0)); infiniteScrollView->setBounceable(false); infiniteScrollView->setDelegate(this); //infiniteScrollView->setContentSize(get); addChild(infiniteScrollView); Sprite* temp = Sprite::create("res/set2/s2_1.png");// log("anchor = %f",temp->getAnchorPoint().x);// temp->setPosition(Point(temp->getContentSize().width / 2, temp->getContentSize().height / 2));// // temp->setPosition(Point( itemSize.width, 0));// infiniteScrollView->addChild(temp); if (imageAry.size() > 0) { itemSize = temp->getContentSize(); } // if (imageAry.size() > 0) { for (int i = 0; i < (imageAry.size() * 5); i++) { //ui::Text* temp = ui::Text::create(StringUtils::format("%d",i % (int)imageAry.size()), fontName, 23); Sprite* sprite = Sprite::create(imageAry.at(i % imageAry.size())); sprite->setTag(i % imageAry.size()); sprite->setPosition(Point(i * itemSize.width + itemSize.width / 2, itemSize.height / 2)); imageStore.push_back(sprite); infiniteScrollView->addChild(sprite); } } infiniteScrollView->setContentSize(Size(imageAry.size() * 5 * itemSize.width, getSize().height)); float viewMiddle = imageAry.size() * 2 * itemSize.width; infiniteScrollView->setContentOffset(Point(-viewMiddle , 0)); }void DJInfiniteScrollPicker::scrollViewDidScroll(extension::ScrollView *view){ float sectionSize = imageAry.size() * itemSize.width; log("QQQQQQQQQQQQ%f,%f",infiniteScrollView->getContentOffset().x,beforePointX); if (beforePointX != infiniteScrollView->getContentOffset().x) { if (infiniteScrollView->getContentOffset().x < 0) { if (infiniteScrollView->getContentOffset().x >= (-sectionSize + sectionSize / 2)) { view->setContentOffset(Point(-sectionSize * 2 +sectionSize / 2, 0)); } else if (view->getContentOffset().x <= (-sectionSize * 3 - sectionSize / 2)) { view->setContentOffset(Point(-sectionSize * 2 - sectionSize / 2, 0)); } // if (infiniteScrollView->isDragging()) { // log("拖拽中"); reloadView(view->getContentOffset().x - getSize().width / 2); // } } else { view->setContentOffset(Point(-sectionSize * 2 + sectionSize / 2, 0)); } //推断是否被拖拽 if (!infiniteScrollView->isDragging()) { //推断是否是首次进入，首次不拖拽 if (isFirstDrag) { beforePointX = -currSprite->getPosition().x + getSize().width / 2; view->setContentOffset(Point(beforePointX, 0)); //log("停止拖拽view->getContentOffset().xQQ = %f",view->getContentOffset().x); if (_infiniteEventListener && _infiniteEventSelector) { (_infiniteEventListener->*_infiniteEventSelector)(currSprite); } // if (_scrollViewEventListener && _scrollViewEventSelector)// {// (_scrollViewEventListener->*_scrollViewEventSelector)(this, SCROLLVIEW_EVENT_SCROLL_TO_TOP);// } } isFirstDrag = true; } } log("view->getContentOffset().x = %f",view->getContentOffset().x); beforePointX = view->getContentOffset().x; }void DJInfiniteScrollPicker::reloadView(float offset){ float biggestSize = 0.0f; Ref* biggestView; Sprite* sprite = imageStore.at(2); for (int i = 0; i < imageStore.size(); i++) { Sprite* sprite = imageStore.at(i); if (-sprite->getPosition().x > (offset - itemSize.width / 2) && -sprite->getPosition().x < (offset + itemSize.width / 2)) { currSprite = sprite; currNum = i; sprite->setScale(2); }else { sprite->setScale(1); } }}void DJInfiniteScrollPicker::snapToAnEmotion(){ float offset = infiniteScrollView->getContentOffset().x - getSize().width / 2; }void DJInfiniteScrollPicker::scrollViewDidZoom(extension::ScrollView *view){ }void DJInfiniteScrollPicker::addEventDJInifiteScrollPicker(cocos2d::Ref *sender, SEL_InfiniteScrollViewEvent type){ _infiniteEventListener = sender; _infiniteEventSelector = type;}