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：
原文地址：http://blog.csdn.net/qqmcy/article/details/27393011
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<std::string> imageAry;
Size itemSize;
float alphaOfobjs;float heightOffset;
float positionRatio;void addEventDJInifiteScrollPicker(Ref* sender,SEL_InfiniteScrollViewEvent type);
private:
std::vector<Sprite*> 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;
}
Cocos2d-x3.0下实现循环列表,布布扣,bubuko.com