在游戏开发中，为了获得更好的交互效果，经常使用对话框，cocos实现对话框也比较容易，说到底对话框也是一个Layer。我们在添加Layer之前首先对对话框进行一定的设置，之后在Layer的OnEnter方法中对界面进行一个动态的加载，另外我们需要重写OnTouchBegin方法，以屏蔽其他的触摸事件。下面是我实现的一个简单对话框
创建C++类DialogLayer实现对话框界面，头文件如下
#ifndef _DialogLayer_
#define _DialogLayer_
#include "cocos2d.h"
USING_NS_CC;
class DialogLayer :public Layer
{
public:
DialogLayer();
~DialogLayer();
virtual bool init();
CREATE_FUNC(DialogLayer);
//virtual void registerWithTouchDispatcher(void);
bool onTouchBegan(Touch *touch,Event *unused_event);
static DialogLayer * create(const char* backgroundImage);
void setTitle(const char* title,int fontsize=20);
void setContentText(const char* text,int fontsize=20,int padding=50,int paddintTop=100);
void setCallbackFunc(CCObject* target,SEL_CallFuncN callfun);
bool addButton(const char* normalImage,const char* selectedImage,const char* title,int tag=0);
virtual void onEnter();
private:
void buttonCallback(CCObject* pSender);
// 文字内容两边的空白区
int m_contentPadding;
int m_contentPaddingTop;
CCObject* m_callbackListener;
SEL_CallFuncN m_callback;
//利用cocos中的宏来添加get与set方法，最后的参数表示方法名中get与set之后相接的部分
CC_SYNTHESIZE_RETAIN(Menu*,m_pMenu,MenuButton);
CC_SYNTHESIZE_RETAIN(Sprite*,m_sfBackGround,SpriteBackGround);
CC_SYNTHESIZE_RETAIN(LabelTTF*,m_ltTitle,LabelTitle);
CC_SYNTHESIZE_RETAIN(LabelTTF*,m_ltContentText,LabelContentText);
};
#endifC++实现部分：
#include "DialogLayer.h"
USING_NS_CC;
DialogLayer::DialogLayer():
m_pMenu(NULL),m_contentPadding(0),m_contentPaddingTop(0),m_callbackListener(NULL),m_callback(NULL),m_sfBackGround(NULL),m_ltContentText(NULL),m_ltTitle(NULL)
{
}
DialogLayer::~DialogLayer(){
CC_SAFE_RELEASE(m_pMenu);
CC_SAFE_RELEASE(m_sfBackGround);
CC_SAFE_RELEASE(m_ltContentText);
CC_SAFE_RELEASE(m_ltTitle);
}
bool DialogLayer::init(){
if(!Layer::init()){
return false;
}
this->setContentSize(Size::ZERO);
// 初始化需要的 Menu
Menu* menu = Menu::create();
menu->setPosition(0,0);
setMenuButton(menu);
setTouchEnabled(true);
return true;
}
//屏蔽向下的监听事件
bool DialogLayer::onTouchBegan(Touch *pTouch,Event *pEvent){
return true;
}
DialogLayer* DialogLayer::create(const char *backgroundImage){
DialogLayer* ml = DialogLayer::create();
ml->setSpriteBackGround(Sprite::create(backgroundImage));
return ml;
}
//设置标题
void DialogLayer::setTitle(const char *title,int fontsize){
LabelTTF* ltfTitle = LabelTTF::create(title,"",fontsize);
setLabelTitle(ltfTitle);
}
//设置对话框要显示的内容
void DialogLayer::setContentText(const char *text,int fontsize,int padding,int paddingTop){
LabelTTF* ltf = LabelTTF::create(text,fontsize);
setLabelContentText(ltf);
m_contentPadding = padding;
m_contentPaddingTop = paddingTop;
}
//设置回调接口
void DialogLayer::setCallbackFunc(cocos2d::CCObject *target,SEL_CallFuncN callfun){
m_callbackListener = target;
m_callback = callfun;
}
bool DialogLayer::addButton(const char *normalImage,const char *selectedImage,const char *title,int tag){
Size winSize = Director::getInstance()->getVisibleSize();
Point pCenter(winSize.width / 2,winSize.height / 2);
// 创建图片菜单按钮
MenuItemImage* menuImage = MenuItemImage::create(normalImage,selectedImage,this,menu_selector(DialogLayer::buttonCallback));
menuImage->setTag(tag);
menuImage->setPosition(pCenter);
// 添加文字说明并设置位置
Size imenu = menuImage->getContentSize();
LabelTTF* ttf = LabelTTF::create(title,20);
ttf->setColor(Color3B::BLACK);
ttf->setPosition(imenu.width / 2,imenu.height / 2);
menuImage->addChild(ttf,1);
getMenuButton()->addChild(menuImage,1);
return true;
}
void DialogLayer::buttonCallback(cocos2d::CCObject *pSender){
Node* node = dynamic_cast<Node*>(pSender);
//当回调接口不为空时，执行回调接口
if (m_callback && m_callbackListener){
(m_callbackListener->*m_callback)(node);
}
this->removeFromParent();
}
void DialogLayer::onEnter(){
Layer::onEnter();
Size winSize = Director::getInstance()->getVisibleSize();
Size contentSize;
// 设定好参数，在运行时加载
getSpriteBackGround()->setPosition(winSize.width / 2,winSize.height / 2);
this->addChild(getSpriteBackGround(),0);
contentSize = getSpriteBackGround()->getTexture()->getContentSize();
// 添加按钮，并设置其位置
this->addChild(getMenuButton());
float btnWidth = contentSize.width / (getMenuButton()->getChildrenCount() + 1);
Vector<Node*> vecArray = getMenuButton()->getChildren();
CCObject* pObj = NULL;
int i = 0;
for(auto& e : vecArray){
Node* node = dynamic_cast<Node*>(e);
node->setPosition(Point(winSize.width/2 - contentSize.width/2+btnWidth*(i+1),winSize.height - contentSize.height-20));
i++;
}
// 显示对话框标题
if (getLabelTitle()){
getLabelTitle()->setPosition(winSize.width/2,winSize.height/2 + (contentSize.height / 2 - 35.0f));
this->addChild(getLabelTitle());
}
// 显示文本内容
if (getLabelContentText()){
LabelTTF* ltf = getLabelContentText();
ltf->setPosition(winSize.width / 2,winSize.height / 2);
ltf->setDimensions(CCSizeMake(contentSize.width - m_contentPadding * 2,contentSize.height - m_contentPaddingTop));
ltf->setHorizontalAlignment(TextHAlignment::LEFT);//设置对齐方式
this->addChild(ltf);
}
// 弹出效果,我们可以实现自己的动画效果
Action* popupLayer = Sequence::create(ScaleTo::create(0.0,0.0),ScaleTo::create(0.06,1.05),ScaleTo::create(0.08,0.95),1.0),NULL);
this->runAction(popupLayer);
}
接下来在HelloWorld层中加入该对话框，我们在回调接口中保存了一个Tag，可以根据这个Tag来判断点击的是哪一个按钮
void HelloWorld::menuCloseCallback(Ref* pSender)
{
showDialog();
}
void HelloWorld::showDialog(){
// 定义一个弹出层，传入一张背景图
DialogLayer* pl = DialogLayer::create("BackGround.png");
pl->setTitle("MyDialog_Title");
pl->setContentText("This is my dialog_contenttext with a pop",20,60,250);
// 设置回调函数，回调传回一个 CCNode 以获取 tag 判断点击的按钮
// 这只是作为一种封装实现，如果使用 delegate 那就能够更灵活的控制参数了
pl->setCallbackFunc(this,callfuncN_selector(HelloWorld::buttonCallback));
// 添加按钮，设置图片，文字，tag 信息
pl->addButton("btn_n.png","btn_p.png","Yes",0);
pl->addButton("btn_n.png","No",1);
// 添加到当前层
this->addChild(pl,1);
}
void HelloWorld::buttonCallback(cocos2d::Node *pNode){
//根据tag来判断点击的时哪个按钮
log("button call back. tag: %d",pNode->getTag());
}
原文链接：https://www.f2er.com/cocos2dx/345249.html