使用cocos-2dx 3.x 封装的PageView

直接上代码：

HelloWorldScene.cpp

#include "HelloWorldScene.h"

USING_NS_CC;

#define COIN_WIDTH 212 //coin 图片宽度
#define COIN_GAP 100    //间隔
#define COIN_COUNT 11   //个数

Scene* HelloWorld::createScene()
{
    // 'scene' is an autorelease object
    auto scene = Scene::create();
    
    // 'layer' is an autorelease object
    auto layer = HelloWorld::create();

    // add layer as a child to scene
    scene->addChild(layer);

    // return the scene
    return scene;
}

// on "init" you need to initialize your instance
bool HelloWorld::init()
{
    //////////////////////////////
    // 1. super init first
    if ( !Layer::init() )
    {
        return false;
    }
    Size visibleSize = Director::getInstance() -> getVisibleSize();
    
    //XKPageView::create(Size size,XKPageViewDelegate *delegate)
    pageView = XKPageView::create(Size(visibleSize.width,COIN_WIDTH),this);
    pageView -> setDirection(ScrollView::Direction::HORIZONTAL);
    //container 定位在屏幕中间
    pageView -> setPosition(Point((visibleSize.width - COIN_WIDTH) * 0.5,(visibleSize.height - COIN_WIDTH) * 0.5));
    
    addPages();
    //设置裁切为false,这样layer 溢出pageView的Size还能显示
    pageView -> setClippingToBounds(false);
    this -> addChild(pageView);
    
    //设置pageView 自动调整时的callback,可以在这里写你要的功能
    pageView -> adjustCallback = [](XKPageView *pageView){
        
        FiniteTimeAction *fadeIn = FadeTo::create(0.15,255);
        FiniteTimeAction *fadeOut = FadeTo::create(0.15,255 * 0.3);
        FiniteTimeAction *scaleToBig = ScaleTo::create(0.15,1.5f);
        FiniteTimeAction *scaleToSmall = ScaleTo::create(0.15,1.0f);
        
        Spawn *spawnIn = Spawn::createWithTwoActions(fadeIn,scaleToBig);
        Spawn *spawnOut = Spawn::createWithTwoActions(fadeOut,scaleToSmall);
        
        int current = pageView -> getCurrentIndex();
        auto sprite = (Sprite*) pageView -> getPageAtIndex(current);
        sprite -> runAction(spawnIn);
        
        sprite = (Sprite *)pageView -> getPageAtIndex(current - 1);
        if (sprite !=NULL){
            sprite -> runAction(spawnOut);
        }
        sprite = (Sprite *)pageView -> getPageAtIndex(current + 1);
        if (sprite !=NULL){
            sprite -> runAction(spawnOut -> clone());
        }
    };
    
    return true;
}

void HelloWorld::addPages()
{
    Size coinSize = Sprite::create("coin.png") -> getContentSize();
    //11个layer 加到layer 上
    for (int i = 0; i < COIN_COUNT; i++) {
        auto sprite = Sprite::create("coin.png");
        sprite -> setPosition(coinSize.width * 0.5,coinSize.height * 0.5);
        std::string str = StringUtils::format("%d",i);
        Label *label = Label::createWithSystemFont(str,"Arial",60);
        label -> setTextColor(Color4B(0,255));
        Size size = sprite -> getContentSize();
        label -> setPosition(size.width * 0.5,size.height * 0.5);
        sprite -> addChild(label);
        //注意这里使用的时XKPageView 的addPage,不是addChild
        pageView -> addPage(sprite);
    }
}

Size HelloWorld::sizeForPerPage()
{
    //Delegate 的东西，返回每个Page 的Size
    return Size(COIN_WIDTH + COIN_GAP,COIN_WIDTH);
}

void HelloWorld::pageViewDidScroll(XKPageView *pageView)
{
    //监听滚动时间，可以再这里写滚动时候要添加的代码,比如缩放~
    Size visibleSize = Director::getInstance() -> getVisibleSize();
    float midX = visibleSize.width / 2;
    float offsetX = pageView -> getContentOffset().x;
    float tmp = COIN_WIDTH / 2.0f;
    float scale = 1.5;
    scale = scale - 1;

    
    for (int i = 0; i < COIN_COUNT; i++) {
        auto sprite = (Sprite *) pageView -> getPageAtIndex(i);
        float positionX = sprite -> getPositionX();
        //转换成相对屏幕坐标
        float endX = positionX + offsetX + midX - tmp;
        if (0 < endX && endX <= midX) {
            float x = endX / midX * scale + 1;
            sprite -> setScale(x);
            x = (endX / midX * 0.7 + 0.3) * 255;
            sprite -> setOpacity(x);
        }else if(endX > midX && endX < visibleSize.width){
            float tmp2 = endX - midX;
            tmp2 = midX - tmp2;
            float x = tmp2 / midX * scale + 1;
            sprite -> setScale(x);
            
            x = (tmp2 / midX * 0.7 + 0.3) * 255;
            sprite -> setOpacity(x);
        }else {
            sprite -> setScale(1.0f);
            sprite -> setOpacity(255 * 0.3);
        }
    }
}

void HelloWorld::onEnter()
{
    Layer::onEnter();
    pageView -> adjustCallback(pageView);
}

#ifndef __HELLOWORLD_SCENE_H__
#define __HELLOWORLD_SCENE_H__

#include "cocos2d.h"
#include "extensions/cocos-ext.h"
#include "XKPageView.h"

USING_NS_CC_EXT;

class HelloWorld : public cocos2d::Layer,public XKPageViewDelegate
{
public:
    // there's no 'id' in cpp,so we recommend returning the class instance pointer
    static cocos2d::Scene* createScene();

    // Here's a difference. Method 'init' in cocos2d-x returns bool,instead of returning 'id' in cocos2d-iphone
    virtual bool init();
    
    // implement the "static create()" method manually
    CREATE_FUNC(HelloWorld);
    
// PageViewDelegate
    virtual Size sizeForPerPage();
    virtual void pageViewDidScroll(XKPageView *pageView);
private:
    XKPageView *pageView;
    void addPages();
public:
    virtual void onEnter();
};

#endif // __HELLOWORLD_SCENE_H__

XKPageView.h

//
//  XKPageView.h
//  XKPageView
//
//  Created by Joueu on 14-11-26.
//
//

#ifndef __XKPageView__XKPageView__
#define __XKPageView__XKPageView__

#include "cocos2d.h"
#include "extensions/cocos-ext.h"

USING_NS_CC;
USING_NS_CC_EXT;

class XKPageView;
class XKPageViewDelegate
{
public:
    
    virtual ~XKPageViewDelegate(){};
    XKPageViewDelegate(){};
    //获取Page大小
    virtual Size sizeForPerPage() = 0;
    //滚动回调
    virtual void pageViewDidScroll(XKPageView *pageView){};
};

class XKPageView:public ScrollView
{
public:
    static XKPageView *create(Size size,XKPageViewDelegate *delegate);
    virtual bool init(Size size,XKPageViewDelegate *delegate);
public:
    void setPageSize(Size size);
    virtual void setContentOffsetInDuration(Vec2 offset,float dt);
    virtual void setContentOffset(Vec2 offset);
private:
    void performedAnimatedScroll(float dt);
    int current_index;
    float current_offset;
    //调整offset 的函数
    void adjust(float offset);
    Size pageSize;
    CC_SYNTHESIZE(XKPageViewDelegate *,_delegate,Delegate);
public:
    int pageCount;
    void addPage(Node *node);
    Node *getPageAtIndex(int index);
    int getCurrentIndex();
    //滚动后调整回调
    std::function<void(XKPageView *)> adjustCallback;
};

#endif /* defined(__XKPageView__XKPageView__) */

//
//  XKPageView.cpp
//  XKPageView
//
//  Created by Joueu on 14-11-26.
//
//

#include "XKPageView.h"

#define XKPAGEVIEW_TAG 10086

XKPageView *XKPageView::create(Size size,XKPageViewDelegate *delegate)
{
    XKPageView *page = new XKPageView();
    if (page && page -> init(size,delegate)) {
        page -> autorelease();
    }else {
        CC_SAFE_RELEASE(page);
    }
    return  page;
}

bool XKPageView::init(Size size,XKPageViewDelegate *delegate)
{
    if (!ScrollView::initWithViewSize(size)) {
        return false;
    }
    //必须有delegate，否则断掉
    CCASSERT(delegate,"delegate should not be NULL!");
    setDelegate(delegate);
    if (_delegate) {
        //获取page的大小
        pageSize = _delegate -> sizeForPerPage();
    }
    //init Data
    pageCount = 0;
    current_index = 0;
    
    this -> setTouchEnabled(false);
    
    auto listener = EventListenerTouchOneByOne::create();
    listener -> onTouchBegan = [&](Touch *touch,Event *event){
        _dragging = false;
        this -> scheduleUpdate();
        if (_direction == ScrollView::Direction::HORIZONTAL) {
            current_offset = this -> getContentOffset().x;
        }else {
            current_offset = this -> getContentOffset().y;
        }
        return true;
    };
    listener -> onTouchMoved = [&](Touch *touch,Event *event){
        float start,end;
        if (_direction == ScrollView::Direction::HORIZONTAL) {
            start = touch -> getStartLocation().x;
            end = touch -> getLocation().x;
        }else {
            start = touch -> getStartLocation().y;
            end = touch -> getLocation().y;
        }
        float offset = end - start;
        // * 2的作用是调节滚动速度，需要调滑动速度的 可以改这个值
        if (_direction == ScrollView::Direction::HORIZONTAL)
            this -> setContentOffset(Vec2(current_offset + offset * 2,0));
        else
            this -> setContentOffset(Vec2(0,current_offset + offset * 2));
    };
    listener -> onTouchEnded = [&](Touch *touch,Event *event){
        float start = current_offset,end;
        if (_direction == ScrollView::Direction::HORIZONTAL) {
            end = this -> getContentOffset().x;
        }else {
            end = this -> getContentOffset().y;
        }
        float offset = end - start;
        this -> adjust(offset);
        _dragging = true;
    };
    Director::getInstance() -> getEventDispatcher() -> addEventListenerWithSceneGraphPriority(listener,this);
    return true;
}

void XKPageView::adjust(float offset)
{
    Vec2 vec;
    float xOrY;
    if (_direction == ScrollView::Direction::HORIZONTAL) {
        vec = Vec2(-( current_index * (pageSize.width)),0);
        xOrY = pageSize.width;
    }else {
        vec = Vec2(0,-( current_index * (pageSize.height)));
        xOrY = pageSize.height;
    }
    //小于50回到原来位置
    if  (abs(offset) < 50){
        this -> setContentOffsetInDuration(vec,0.15f);
        return;
    }
    
    int i = abs(offset / (xOrY)) + 1;
    if (offset < 0) {
        current_index += i;
    }else {
        current_index -= i;
    }
    
    if (current_index < 0) {
        current_index = 0;
    }else if(current_index > 10){
        current_index = 10;
    }
    
    if (_direction == ScrollView::Direction::HORIZONTAL) {
        vec = Vec2(-( current_index * (pageSize.width)),0);
    }else {
        vec = Vec2(0,-( current_index * (pageSize.height)));
    }
    this -> adjustCallback(this);
    this -> setContentOffsetInDuration(vec,0.15f);
}

void XKPageView::setContentOffset(Vec2 offset)
{
    ScrollView::setContentOffset(offset);
    if (_delegate != nullptr)
    {
        _delegate -> pageViewDidScroll(this);
    }
}

void XKPageView::setContentOffsetInDuration(Vec2 offset,float dt)
{
    ScrollView::setContentOffsetInDuration(offset,dt);
    this->schedule(schedule_selector(XKPageView::performedAnimatedScroll));
}

void XKPageView::performedAnimatedScroll(float dt)
{
    if (_dragging)
    {
        this->unschedule(schedule_selector(XKPageView::performedAnimatedScroll));
        this -> unscheduleUpdate();
        return;
    }
    
    if (_delegate != nullptr)
    {
        _delegate -> pageViewDidScroll(this);
    }
}

void XKPageView::addPage(Node *node)
{
    if (_direction == ScrollView::Direction::HORIZONTAL) {
        node -> setPosition(Point(pageCount * pageSize.width + node -> getPositionX(),node -> getPositionY()));
        this -> setContentSize(Size((pageCount + 1) * pageSize.width,pageSize.height));
    }else {
        node -> setPosition(Point(node -> getPositionX(),pageCount * pageSize.height + node -> getPositionY()));
        this -> setContentSize(Size(pageSize.width,(pageCount + 1) *pageSize.height));
    }
    node -> setTag(pageCount + XKPAGEVIEW_TAG);
    _container -> addChild(node);
    pageCount ++;
    
}

Node *XKPageView::getPageAtIndex(int index)
{
    if (index < pageCount && index >= 0) {
        return _container -> getChildByTag(index + XKPAGEVIEW_TAG);
    }
    return  NULL;
}

int XKPageView::getCurrentIndex()
{
    return current_index;
}

（编辑：李大同）

【声明】本站内容均来自网络，其相关言论仅代表作者个人观点，不代表本站立场。若无意侵犯到您的权利，请及时与联系站长删除相关内容!