cocos2d-x CCScrollView和CCTableView的使用
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。
1. 首先实现游戏帮助界面
(1) 创建头文件GalleryLayer.h
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#ifndef GALLERY_LAYER_H
#define GALLERY_LAYER_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滚动的时候会调用
void
scrollViewDidScroll(CCScrollView* view);
//scrollview缩放的时候会调用
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
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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
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#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)
{
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
);
}
}
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这里一共有三张图，是从捕鱼达人中拿出来的背景图，当滚完三张图时就跳转到ListViewLayer场景去，上面的代码比较容易懂。
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。
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typedef
enum
{
kCCScrollViewDirectionNone = -1,
kCCScrollViewDirectionHorizontal = 0,
kCCScrollViewDirectionVertical,
kCCScrollViewDirectionBoth
} CCScrollViewDirection;
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下面来看看这部分的效果：
2. 现在来实现列表展示(ListView)的效果
（1）创建ListViewLayer.h
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#ifndef LISTVIEW_LAYER_H
#define LISTVIEW_LAYER_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
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ListViewLayer继承了CCTableViewDataSource和CCTableViewDelegate。这两个抽象类封装了几个有用的函数，我们在下面的源码中将实现它们。
（2）源文件 ListViewLayer.cpp
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#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)
{
}
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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。
下面是效果图：
源码下载地址：http://download.csdn.net/detail/zhoujianghai/4975604
转载请注明来自：Alex Zhou的程序世界，本文链接：http://codingnow.cn/cocos2d-x/1024.html