在游戏和应用中经常要实现左右滑动展示游戏帮助、以列表显示内容的UI效果,就像android中的Gallery和ListView。本文通过CCScrollView和CCTableView分别来实现这两个效果,基于cocos2d-x 2.0.4版本。
首先来简单了解一下这两个东东,CCScrollView本身是一个CCLayer,而CCTableView是CCScrollView的子类,这是引擎已经帮我们封装好了的,CCTableView可以设置成横向和纵向,用它可以实现类似于Gallery和ListView的效果。
二、实现
1.添加cocos2d-x扩展库文件
2. 首先实现游戏帮助界面
(1) 创建头文件GalleryLayer.h
- #ifndef __HELP_SCENE_H__
- #define __HELP_SCENE_H__
- #include "cocos2d.h"
- #include "SimpleAudioEngine.h"
- #include "cocos-ext.h"
- USING_NS_CC;
- USING_NS_CC_EXT;
- class GalleryLayer : public cocos2d::CCLayer ,public CCScrollViewDelegate
- {
- public:
- virtual bool init();
- void menuCloseCallback(CCObject* pSender);
- CREATE_FUNC(GalleryLayer);
- public:
- //scrollview滚动的时候调用
- void scrollViewDidScroll(CCScrollView* view);
- //缩放的时候调用
- void scrollViewDidZoom(CCScrollView* view);
- 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);
- private:
- //根据手势滑动的距离和方向滚动图层
- void adjustScrollView(float offset);
- CCScrollView *m_pScrollView;
- CCPoint m_touchPoint;
- int m_nCurPage;
- };
- #endif
类GalleryLayer继承了CCScrollViewDelegate,实现了它的两个纯虚函数,主要是为了当scrollview滚动和缩放时回调这两函数,这样我们就可以在这两函数中做相关操作了。
(2) 看源文件GalleryLayer.cpp
- #include "GalleryLayer.h"
- #include "ListViewLayer.h"
- using namespace cocos2d;
- using namespace cocos2d::extension;
- bool GalleryLayer::init()
- {
- bool bRet = false;
- do
- {
- CC_BREAK_IF( !CCLayer::init() );
- m_nCurPage = 1;
- CCSize visibleSize = CCDirector::sharedDirector()->getVisibleSize();
- CCPoint origin = CCDirector::sharedDirector()->getVisibleOrigin();
- CCLayer *pLayer = CCLayer::create();
- char helpstr[30] = {0};
- for (int i = 1; i <= 3; ++ i)
- {
- memset(helpstr, 0, sizeof(helpstr));
- sprintf(helpstr,"bg_%02d.png",i);
- CCSprite *pSprite = CCSprite::create(helpstr);
- pSprite->setPosition(ccp(visibleSize.width * (i-0.5f), visibleSize.height / 2));
- pLayer->addChild(pSprite);
- }
- m_pScrollView = CCScrollView::create(CCSizeMake(960, 640), pLayer);
- m_pScrollView->setContentOffset(CCPointZero);
- m_pScrollView->setTouchEnabled(false);
- m_pScrollView->setDelegate(this);
- m_pScrollView->setDirection(kCCScrollViewDirectionHorizontal);
- pLayer->setContentSize(CCSizeMake(960*3, 640));
- this->addChild(m_pScrollView);
- CCSpriteFrameCache *pCache = CCSpriteFrameCache::sharedSpriteFrameCache();
- pCache->addSpriteFrame(CCSpriteFrame::create("button_normal.png",CCRectMake(0, 0, 64, 64)),"button_normal.png");
- pCache->addSpriteFrame(CCSpriteFrame::create("button_selected.png",CCRectMake(0, 0, 64, 64)),"button_selected.png");
- for (int i = 1; i <= 3; ++ i)
- {
- CCSprite *pPoint = CCSprite::createWithSpriteFrameName("button_normal.png");
- pPoint->setTag(i);
- pPoint->setPosition(ccp( origin.x + (visibleSize.width - 3 * pPoint->getContentSize().width)/2 + pPoint->getContentSize().width * (i-1), origin.y + 30));
- this->addChild(pPoint);
- }
- CCSprite *pPoint = (CCSprite *)this->getChildByTag(1);
- pPoint->setDisplayFrame(pCache->spriteFrameByName("button_selected.png"));
- bRet = true;
- }while(0);
- return bRet;
- }
- void GalleryLayer::menuCloseCallback(CCObject* pSender)
- {
- }
- void GalleryLayer::scrollViewDidScroll(cocos2d::extension::CCScrollView *view)
- {
- CCLOG("scroll");
- }
- void GalleryLayer::scrollViewDidZoom(cocos2d::extension::CCScrollView *view)
- {
- CCLOG("zoom");
- }
- void GalleryLayer::onEnter()
- {
- CCLayer::onEnter();
- CCDirector::sharedDirector()->getTouchDispatcher()->addTargetedDelegate(this, 1, false);
- }
- void GalleryLayer::onExit()
- {
- CCDirector::sharedDirector()->getTouchDispatcher()->removeDelegate(this);
- CCLayer::onExit();
- CCSpriteFrameCache::sharedSpriteFrameCache()->removeUnusedSpriteFrames();
- }
- bool GalleryLayer::ccTouchBegan(CCTouch *pTouch, CCEvent *pEvent)
- {
- m_touchPoint = CCDirector::sharedDirector()->convertToGL(pTouch->getLocationInView());
- return true;
- }
- void GalleryLayer::ccTouchMoved(CCTouch *pTouch, CCEvent *pEvent)
- {
- }
- void GalleryLayer::ccTouchEnded(CCTouch *pTouch, CCEvent *pEvent)
- {
- CCPoint endPoint = CCDirector::sharedDirector()->convertToGL(pTouch->getLocationInView());
- float distance = endPoint.x - m_touchPoint.x;
- if(fabs(distance) > 50)
- {
- adjustScrollView(distance);
- }
- }
- void GalleryLayer::ccTouchCancelled(cocos2d::CCTouch *pTouch, cocos2d::CCEvent *pEvent)
- {
- CCPoint endPoint = CCDirector::sharedDirector()->convertToGL(pTouch->getLocationInView());
- float distance = endPoint.x - m_touchPoint.x;
- if(fabs(distance) > 50)
- {
- adjustScrollView(distance);
- }
- }
- void GalleryLayer::adjustScrollView(float offset)
- {
- CCSize visibleSize = CCDirector::sharedDirector()->getVisibleSize();
- CCPoint origin = CCDirector::sharedDirector()->getVisibleOrigin();
- CCSpriteFrameCache *pCache = CCSpriteFrameCache::sharedSpriteFrameCache();
- CCSprite *pPoint = (CCSprite *)this->getChildByTag(m_nCurPage);
- pPoint->setDisplayFrame(pCache->spriteFrameByName("button_normal.png"));
- if (offset<0)
- {
- m_nCurPage ++;
- }else
- {
- m_nCurPage --;
- }
- if (m_nCurPage <1)
- {
- m_nCurPage = 1;
- }
- if(m_nCurPage > 3)
- {
- //拨动到大于第三层,添加listViewLayer
- CCLayer *pLayer = ListViewLayer::create();
- CCScene *pScene = CCScene::create();
- pScene->addChild(pLayer);
- CCDirector::sharedDirector()->replaceScene(pScene);
- }
- else
- {
- pPoint = (CCSprite *)this->getChildByTag(m_nCurPage);
- pPoint->setDisplayFrame(pCache->spriteFrameByName("button_selected.png"));
- CCPoint adjustPos = ccp(origin.x - visibleSize.width * (m_nCurPage-1), 0);
- m_pScrollView->setContentOffset(adjustPos, true);
- }
- }
首先创建一个CCLayer,包含三张背景图,设置CCLayer的ContentSize,并设置三张图片的位置然后设置CCLayer为CCScrollview的内容,并设置CCScrollView的显示区域。最后根据用户滑动的方向和距离,通过设置scrollview的setContentOffset,滚动视图。CCScrollview.h文件中封装了一个枚举类型,一共有四个方向,常用横向和纵向,这里使用了横向。
- typedef enum {
- kCCScrollViewDirectionNone = -1,
- kCCScrollViewDirectionHorizontal = 0,
- kCCScrollViewDirectionVertical,
- kCCScrollViewDirectionBoth
- } CCScrollViewDirection;
(3) 测试代码
AppDelegate.cpp,找到applicationDidFinishLaunching()添加,显示屏幕size
- //显示屏幕的size
- CCSize screenSize = CCEGLView::sharedOpenGLView()->getFrameSize();
- CCSize designSize = CCSizeMake(960, 640);
- if (screenSize.height != 960)
- {
- CCSize resourceSize = CCSizeMake(960, 640);
- pDirector->setContentScaleFactor(resourceSize.height / designSize.height);
- }
- CCEGLView::sharedOpenGLView()->setDesignResolutionSize(designSize.width, designSize.height, kResolutionNoBorder);
- CCLayer *pLayer = GalleryLayer::create();
- this->addChild(pLayer);
3.现在来实现列表展示(ListView)的效果
(1)创建ListViewLayer.h
- #ifndef __TABLEVIEWTESTSCENE_H__
- #define __TABLEVIEWTESTSCENE_H__
- #include "cocos2d.h"
- #include "cocos-ext.h"
- class ListViewLayer : public cocos2d::CCLayer, public cocos2d::extension::CCTableViewDataSource, public cocos2d::extension::CCTableViewDelegate
- {
- public:
- virtual bool init();
- virtual void scrollViewDidScroll(cocos2d::extension::CCScrollView* view);
- virtual void scrollViewDidZoom(cocos2d::extension::CCScrollView* view);
- //处理触摸事件,可以计算点击的是哪一个子项
- virtual void tableCellTouched(cocos2d::extension::CCTableView* table, cocos2d::extension::CCTableViewCell* cell);
- //每一项的宽度和高度
- virtual cocos2d::CCSize cellSizeForTable(cocos2d::extension::CCTableView *table);
- //生成列表每一项的内容
- virtual cocos2d::extension::CCTableViewCell* tableCellAtIndex(cocos2d::extension::CCTableView *table, unsigned int idx);
- //一共多少项
- virtual unsigned int numberOfCellsInTableView(cocos2d::extension::CCTableView *table);
- CREATE_FUNC(ListViewLayer);
- };
- #endif
- #include "ListViewLayer.h"
- USING_NS_CC;
- USING_NS_CC_EXT;
- bool ListViewLayer::init()
- {
- bool bRet = false;
- do
- {
- CC_BREAK_IF( !CCLayer::init() );
- CCTableView* pTableView = CCTableView::create(this, CCSizeMake(960, 640));
- pTableView->setDirection(kCCScrollViewDirectionVertical);
- pTableView->setPosition(CCPointZero);
- pTableView->setDelegate(this);
- pTableView->setVerticalFillOrder(kCCTableViewFillTopDown);
- this->addChild(pTableView);
- pTableView->reloadData();
- bRet = true;
- }while(0);
- return bRet;
- }
- void ListViewLayer::tableCellTouched(CCTableView* table, CCTableViewCell* cell)
- {
- CCLog("cell touched at index: %i", cell->getIdx());
- }
- CCSize ListViewLayer::cellSizeForTable(CCTableView *table)
- {
- return CCSizeMake(960, 120);
- }
- CCTableViewCell* ListViewLayer::tableCellAtIndex(CCTableView *table, unsigned int idx)
- {
- CCString *pString = CCString::createWithFormat("%d", idx);
- CCTableViewCell *pCell = table->dequeueCell();
- if (!pCell) {
- pCell = new CCTableViewCell();
- pCell->autorelease();
- CCSprite *pSprite = CCSprite::create("listitem.png");
- pSprite->setAnchorPoint(CCPointZero);
- pSprite->setPosition(CCPointZero);
- pCell->addChild(pSprite);
- CCLabelTTF *pLabel = CCLabelTTF::create(pString->getCString(), "Arial", 20.0);
- pLabel->setPosition(CCPointZero);
- pLabel->setAnchorPoint(CCPointZero);
- pLabel->setTag(123);
- pCell->addChild(pLabel);
- }
- else
- {
- CCLabelTTF *pLabel = (CCLabelTTF*)pCell->getChildByTag(123);
- pLabel->setString(pString->getCString());
- }
- return pCell;
- }
- unsigned int ListViewLayer::numberOfCellsInTableView(CCTableView *table)
- {
- return 20;
- }
- void ListViewLayer::scrollViewDidScroll(CCScrollView *view)
- {
- }
- void ListViewLayer::scrollViewDidZoom(CCScrollView *view)
- {
- }
首先需要创建CCTableView,设置它的显示区域和显示方向,这里使用了纵向。设置每个子项的宽度和高度,子项的数量以及每个子项对应的内容。每个子项是一个CCTableViewCell,这里进行了优化,复用了子项对象。
参考博文:http://codingnow.cn/cocos2d-x/1024.html
源码下载地址:http://download.youkuaiyun.com/detail/zhoujianghai/4975604