Cocos2d-x计算字符串Size方法

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项目需要，根据输入字符串，计算字符串所需要占的Size。封装代码如下，只需传入字符串，即可返回Size：

Size ChartDemoScene::calculateFontSize(const char *str )
{
	std::string tempString = str;
	log("tempString = %s",tempString.c_str());
	size_t computeCount = tempString.size();       //如果字符串很长每次抽取100个字符来计算size；
	Size size = Size(0,0);
	for (int i = 0; i<computeCount ;)
	{
        std::string substring =  tempString.substr(i,1);
		if ((substring.c_str()[0] & 0x80 )!=0) //是汉字
		{
			substring = tempString.substr(i,3);
			i += 3;
		}
		else
		{
			i++;
		}
		//CCLog("subString  = %s ",substring.c_str());
        auto tempLabel = LabelTTF::create(substring.c_str(),"",25);
        tempLabel->setHorizontalAlignment(cocos2d::TextHAlignment::LEFT);
		Size tmpLsize = tempLabel->getContentSize();
		size.width+=tmpLsize.width;
	}
    
	float fHeight= 0;
	if( size.width > chartWidth)//大于容器的宽度
	{
        fHeight = (size.width / 200 );//计算需要多少行
	}
	int nHeight =  ceil(fHeight);
	
	if (nHeight == 0)
	{
		nHeight = 1;
	}
    
	Size labelSize ;
	if (size.width < chartWidth)
	{
		labelSize = Size(size.width,nHeight*32);//计算容器的Size
	}
	else
	{
        labelSize = Size(chartWidth,nHeight*28);
	}
	
	//CCLog("labelSize = (%f,%f)",labelSize.width,labelSize.height);
	//CCLog("fHeight = %f  nHeight = %d ",fHeight,nHeight);
	return labelSize;
}

例子：

1、AppDelegate.cpp中添加如下代码

auto scene = ChartDemoScene::createScene();

    // run
    director->runWithScene(scene);
(1)ChartDemoScene.hChartDemoScene.h 
//
//  ChartDemoScene.h
//  chartDemo
//
//  Created by chen on 14-9-2.
//
//

#ifndef __chartDemo__ChartDemoScene__
#define __chartDemo__ChartDemoScene__

#include "cocos2d.h"
#include "ui/CocosGUI.h"
#include "../cocos2d/extensions/cocos-ext.h"
using namespace cocos2d::ui;
USING_NS_CC;
USING_NS_CC_EXT;

class ChartDemoScene : public cocos2d::Layer//,public cocos2d::extension::EditBoxDelegate
{
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();
    
    // a selector callback
    void menuCloseCallback(cocos2d::Ref* pSender);
    
    // implement the "static create()" method manually
    CREATE_FUNC(ChartDemoScene);
    
//    virtual void editBoxEditingDidBegin(cocos2d::extension::EditBox* editBox);
//    virtual void editBoxEditingDidEnd(cocos2d::extension::EditBox* editBox);
//    virtual void editBoxTextChanged(cocos2d::extension::EditBox* editBox,const std::string& text);
//    virtual void editBoxReturn(cocos2d::extension::EditBox* editBox);

    void touchEvent(Ref *pSender,Widget::TouchEventType type);
    void textFieldEvent(Ref* pSender,TextField::EventType type);
    void showAlertShow(std::string contentString);
    void alertCallback(ui::Text* alert);
    
    Size calculateFontSize(const char *str);
    
    std::string getcurrTime();//获取当前年月日
    std::string getcurrMonthTime();//获取时分秒

//    EditBox* editText;
    TextField* editText;
    Text* text;
    TextField* _text;//获取被删除Item的内容
    std::string file_path;//存放消息记录
    TextField* textContent;
    ui::Button* sendBtn;
    std::string str;
    Size winSize;
    float chartWidth;
    size_t length;
    ui::ListView* _listView;
    
};
#endif /* defined(__chartDemo__ChartDemoScene__) */

(2)ChartDemoScene.cpp

#include "ChartDemoScene.h"
#include "stdio.h"

enum alertTag
{
    Alert_Tag = 1000
    
}AlertTag;

enum textTag
{
    T_Tag = 100
}TextTag;

USING_NS_CC;
int count = 1;
int _rem = 0;
Scene* ChartDemoScene::createScene()
{
    // 'scene' is an autorelease object
    auto scene = Scene::create();
    scene->setColor(Color3B::BLACK);
    // 'layer' is an autorelease object
    auto layer = ChartDemoScene::create();
    layer->setAnchorPoint(Vec2::ANCHOR_MIDDLE_BOTTOM);
    layer->setContentSize(Size(640,960));
    // add layer as a child to scene
    scene->addChild(layer);
    
    // return the scene
    return scene;
}

// on "init" you need to initialize your instance
bool ChartDemoScene::init()
{
    bool bRet = false;
    do{
        CC_BREAK_IF(!Layer::init());
        //大背景
        winSize = Director::getInstance()->getWinSize();
        file_path = FileUtils::getInstance()->getWritablePath() + "chartContent.txt";
        
        chartWidth = winSize.width *3 / 5;
        auto sprite = Sprite::create("orange_edit.png");
        sprite->setScaleX(winSize.width / sprite->getContentSize().width);
        sprite->setScaleY(winSize.height / sprite->getContentSize().height);
        sprite->setAnchorPoint(Vec2::ANCHOR_MIDDLE);
        sprite->setPosition(Vec2(winSize.width/2,winSize.height/2));
        addChild(sprite);
        
        auto layerColor = LayerColor::create(Color4B(43,177,233,255));
        layerColor->setContentSize(Size(winSize.width,100));
        layerColor->ignoreAnchorPointForPosition(false);
        layerColor->setAnchorPoint(Vec2::ANCHOR_MIDDLE_TOP);
        layerColor->setPosition(Vec2(winSize.width/2,winSize.height));
        addChild(layerColor,4);
        
        //底部输入栏
        auto layout = Layout::create();
        layout->setSize(Size(winSize.width,100));
        layout->setAnchorPoint(Vec2::ZERO);
        layout->setPosition(Vec2::ZERO);
        layout->setBackGroundColorType(cocos2d::ui::Layout::BackGroundColorType::SOLID);
        layout->setBackGroundColor(Color3B(185,185,185));
        //消息显示栏
        _listView = ListView::create();
        _listView->setDirection(ui::ScrollView::Direction::VERTICAL);
        _listView->setTouchEnabled(true);
        _listView->setBounceEnabled(true);
        _listView->setGravity(cocos2d::ui::ListView::Gravity::BOTTOM);
//        _listView->setItemsMargin(2);
        _listView->setBackGroundColorType(cocos2d::ui::Layout::BackGroundColorType::SOLID);
        _listView->setBackGroundColor(Color3B::WHITE);
        _listView->setSize(Size(winSize.width,winSize.height-layout->getSize().height-25-100));
        _listView->setAnchorPoint(Vec2::ANCHOR_MIDDLE_BOTTOM);
        _listView->setPosition(Vec2(winSize.width/2,layout->getSize().height+25));
        addChild(_listView);
        
        //底部输入框背景
        auto bg = Sprite::create("whitebg.png");
        bg->setScaleX(winSize.width*3/5 / bg->getContentSize().width);
        bg->setScaleY(80 / bg->getContentSize().height);
        bg->setAnchorPoint(Vec2::ANCHOR_MIDDLE_LEFT);
        bg->setPosition(Vec2(winSize.width/5,layout->getSize().height/2));
        layout->addChild(bg);
        
        //
        editText = TextField::create("",30);
        editText->ignoreContentAdaptWithSize(false);
        editText->setSize(Size(winSize.width*3/5,80));
        editText->setTextHorizontalAlignment(cocos2d::TextHAlignment::LEFT);
        editText->setTextVerticalAlignment(cocos2d::TextVAlignment::BOTTOM);
        editText->setAnchorPoint(Vec2::ANCHOR_MIDDLE_LEFT);
        editText->setPosition(Vec2(winSize.width/5,layout->getSize().height/2));
        editText->setColor(Color3B::BLACK);
        editText->addEventListener(CC_CALLBACK_2(ChartDemoScene::textFieldEvent,this));
        layout->addChild(editText);
        addChild(layout);
        
        //发送按钮
        sendBtn = ui::Button::create("orange_edit.png");
        sendBtn->setAnchorPoint(Vec2::ANCHOR_MIDDLE_RIGHT);
        sendBtn->setPosition(Vec2(winSize.width - 20,layout->getSize().height/2));
        addChild(sendBtn);
        
        sendBtn->addTouchEventListener(CC_CALLBACK_2(ChartDemoScene::touchEvent,this));
        
        auto alert_Text = ui::Text::create();
        alert_Text->setSize(Size(50,200));
        alert_Text->setTag(Alert_Tag);
        alert_Text->setOpacity(0);
        alert_Text->setFontSize(35);
        char* userdata = "11";
        alert_Text->setUserData(userdata);
        alert_Text->setColor(Color3B::BLACK);
        alert_Text->setPosition(Vec2(winSize.width/2,winSize.height/8));
        addChild(alert_Text);

        bRet = true;
    }while(0);
    return bRet;
}

Size ChartDemoScene::calculateFontSize(const char *str )
{
	std::string tempString = str;
	log("tempString = %s",25);
        tempLabel->setHorizontalAlignment(cocos2d::TextHAlignment::LEFT);
		Size tmpLsize = tempLabel->getContentSize();
		size.width+=tmpLsize.width;
	}
    
	float fHeight= 0;
	if( size.width > chartWidth)
	{
        fHeight = (size.width / 200 );
	}
	int nHeight =  ceil(fHeight);
	
	if (nHeight == 0)
	{
		nHeight = 1;
	}
    
	Size labelSize ;
	if (size.width < chartWidth)
	{
		labelSize = Size(size.width,nHeight*32);
	}
	else
	{
        labelSize = Size(chartWidth,nHeight);
	return labelSize;
}

void ChartDemoScene::touchEvent(cocos2d::Ref *pSender,Widget::TouchEventType type)
{
    switch (type) {
        case ui::Widget::TouchEventType::ENDED:
        {
            if(str.empty())
            {
                showAlertShow("输入内容不能为空");
                break;
            }
            
            log("str = %s",str.c_str());
            
            auto time = getcurrMonthTime().c_str();
            auto text = Text::create(time,30);
            text->setAnchorPoint(Vec2::ANCHOR_MIDDLE);
            text->setColor(Color3B::BLACK);
            
            auto _timeLayout = Layout::create();
            _timeLayout->setSize(Size(_listView->getSize().width,60));
            _timeLayout->setLayoutType(cocos2d::ui::Layout::Type::RELATIVE);
            
            auto rp_time = RelativeLayoutParameter::create();
            rp_time->setAlign(cocos2d::ui::RelativeLayoutParameter::RelativeAlign::CENTER_IN_PARENT);
            text->setLayoutParameter(rp_time);
            _timeLayout->addChild(text);
            _listView->pushBackCustomItem(_timeLayout);
            
            if(count % 2)
           {
                count++;
                auto _lLayout = Layout::create();
                _lLayout->setSize(Size(_listView->getSize().width,80));
                _lLayout->setLayoutType(cocos2d::ui::Layout::Type::RELATIVE);
               
               auto _lHeader = ui::ImageView::create("logo_douban.png");
               _lHeader->setAnchorPoint(Vec2::ANCHOR_MIDDLE);
               _lHeader->setScale(0.5);
               
               auto rp_l = RelativeLayoutParameter::create();
               rp_l->setMargin(Margin(10,0));
               rp_l->setRelativeName("head");
               rp_l->setAlign(cocos2d::ui::RelativeLayoutParameter::RelativeAlign::PARENT_LEFT_CENTER_VERTICAL);
               _lHeader->setLayoutParameter(rp_l);
               _lLayout->addChild(_lHeader);
               
                auto _lTextContent = TextField::create("",30);
                _lTextContent->ignoreContentAdaptWithSize(false);
               auto size = calculateFontSize(str.c_str());
               _lTextContent->setSize(size);
               _lTextContent->setTextHorizontalAlignment(cocos2d::TextHAlignment::LEFT);

               if(size.width < chartWidth)
               {
                   _lTextContent->setTextHorizontalAlignment(cocos2d::TextHAlignment::RIGHT);
               }
                _lTextContent->setTextVerticalAlignment(cocos2d::TextVAlignment::CENTER);
                _lTextContent->setTouchEnabled(false);
               _lTextContent->setTag(T_Tag);
                _lTextContent->setAnchorPoint(Vec2::ANCHOR_MIDDLE_LEFT);
                _lTextContent->setColor(Color3B::BLACK);
                _lTextContent->setText(str);
               _lLayout->addChild(_lTextContent);
               str.clear();
               
               auto rp_t = RelativeLayoutParameter::create();
               rp_t->setMargin(Margin(10,0));
               rp_t->setRelativeToWidgetName("head");
               rp_t->setAlign(cocos2d::ui::RelativeLayoutParameter::RelativeAlign::LOCATION_RIGHT_OF_CENTER);
               _lTextContent->setLayoutParameter(rp_t);
               
               _listView->pushBackCustomItem(_lLayout);
               
           }else
           {
               count++;
                auto _rLayout = Layout::create();
                _rLayout->setSize(Size(_listView->getSize().width,80));
                _rLayout->setLayoutType(cocos2d::ui::Layout::Type::RELATIVE);
               
               auto _rHeader = ui::ImageView::create("logo_mingdao.png");
               _rHeader->setAnchorPoint(Vec2::ANCHOR_MIDDLE);
               _rHeader->setScale(0.5);
               
               auto rp_r = RelativeLayoutParameter::create();
               rp_r->setMargin(Margin(0,10,0));
               rp_r->setRelativeName("head");
               rp_r->setAlign(cocos2d::ui::RelativeLayoutParameter::RelativeAlign::PARENT_RIGHT_CENTER_VERTICAL);
               _rHeader->setLayoutParameter(rp_r);
               _rLayout->addChild(_rHeader);

               
                auto _rTextContent = TextField::create("",30);
               _rTextContent->setTag(T_Tag);
                _rTextContent->ignoreContentAdaptWithSize(false);
               auto size = calculateFontSize(str.c_str());
               _rTextContent->setSize(size);
               _rTextContent->setTextHorizontalAlignment(cocos2d::TextHAlignment::LEFT);
                _rTextContent->setTextVerticalAlignment(cocos2d::TextVAlignment::CENTER);
                _rTextContent->setTouchEnabled(false);
                _rTextContent->setAnchorPoint(Vec2::ANCHOR_MIDDLE_RIGHT);
                _rTextContent->setColor(Color3B::BLACK);
                _rTextContent->setText(str);
               str.clear();
               auto rp_l = RelativeLayoutParameter::create();
               rp_l->setMargin(Margin(0,0));
               rp_l->setRelativeToWidgetName("head");
               rp_l->setAlign(cocos2d::ui::RelativeLayoutParameter::RelativeAlign::LOCATION_LEFT_OF_CENTER);
               _rTextContent->setLayoutParameter(rp_l);
               _rLayout->addChild(_rTextContent);
               
               _listView->pushBackCustomItem(_rLayout);
           }
            

//            if(_listView->getContentSize().height > _listView->getSize().height)
//            {
                _listView->scrollToBottom(0.5,true);
//            }
            editText->setText("");
            
            if(count > 3 )
            {
                _listView->removeItem(0);//删除时间标签，此时Item(0)就是内容标签
                auto temp = static_cast<Layout*>(_listView->getItem(0));//获取当前内容标签
                if(_text)
                {
                    removeChild(_text);
                }
                _text = static_cast<TextField*>(temp->getChildByTag(T_Tag));//获取内容标签
                log("string = %s",_text->getStringValue().c_str());//获取内容
                log("file_path = %s",file_path.c_str());
                FILE* fp = std::fopen(file_path.c_str(),"at+");
                CCASSERT(fp != NULL,"file open error");
                length = _text->getStringValue().length();
                log("length = %lu",length);
                fwrite(_text->getStringValue().c_str(),length,1,fp);
                fclose(fp);
                
                _listView->removeItem(0);
            }

            break;
        }
        default:
            break;
    }
}

void ChartDemoScene::textFieldEvent(cocos2d::Ref *pSender,TextField::EventType type)
{
    switch (type)
    {
        case TextField::EventType::ATTACH_WITH_IME:
        {
            TextField* textField = dynamic_cast<TextField*>(pSender);
            Size widgetSize = winSize;
            runAction(CCMoveTo::create(0.225f,Vec2(0,widgetSize.height / 2.0f)));
            textField->setTextHorizontalAlignment(TextHAlignment::LEFT);
            textField->setTextVerticalAlignment(TextVAlignment::TOP);
        }
            break;
            
        case TextField::EventType::DETACH_WITH_IME:
        {
            TextField* textField = dynamic_cast<TextField*>(pSender);
            Size widgetSize = winSize;
            runAction(CCMoveTo::create(0.175f,0)));
            textField->setTextHorizontalAlignment(TextHAlignment::LEFT);
            textField->setTextVerticalAlignment(TextVAlignment::CENTER);
            
            str = editText->getStringValue().c_str();
            str += "\n";
        }
            break;
            
        case TextField::EventType::INSERT_TEXT:
            break;
            
        case TextField::EventType::DELETE_BACKWARD:
            break;
            
        default:
            break;
    }

}

void ChartDemoScene::showAlertShow(std::string contentString)
{
    auto alert = dynamic_cast<ui::Text*>(getChildByTag(Alert_Tag));
    if (alert->getUserData() == "11") {
        alert->setOpacity(255);
        char* userdata = "110";
        alert->setUserData(userdata);
        
        alert->setString(contentString);
        auto call_func = CallFunc::create(CC_CALLBACK_0(ChartDemoScene::alertCallback,this,alert));
        auto seq = Sequence::create(FadeOut::create(1.0f),call_func,NULL);
        alert->runAction(seq);
    }
    
}

void ChartDemoScene::alertCallback(ui::Text* alert)
{
    
    alert->setString("");
    char* userdata = "11";
    alert->setUserData(userdata);
    
}

std::string ChartDemoScene::getcurrTime()//获取当前年月日
{
    
#if (CC_TARGET_PLATFORM == CC_PLATFORM_ANDROID || CC_TARGET_PLATFORM == CC_PLATFORM_IOS)
    
    struct timeval now;
    struct tm* time;
    
    gettimeofday(&now,NULL);
    
    
    time = localtime(&now.tv_sec);
    int year = time->tm_year + 1900;
    
    char date[32] = {0};
    sprintf(date,"%d-%02d-%02d",(int)time->tm_year + 1900,(int)time->tm_mon + 1,(int)time->tm_mday);
    return StringUtils::format("%s",date);
    
#endif
    
#if ( CC_TARGET_PLATFORM == CC_PLATFORM_WIN32 )
    
    struct tm* tm;
    time_t timep;
    time(timep);
    
    tm = localtime(&timep);
    char date[32] = {0};
    sprintf(date,date);
    
#endif
    
}

std::string ChartDemoScene::getcurrMonthTime()
{
#if (CC_TARGET_PLATFORM == CC_PLATFORM_ANDROID || CC_TARGET_PLATFORM == CC_PLATFORM_IOS)
    
    struct timeval now;
    struct tm* time;
    
    gettimeofday(&now,NULL);
    
    
    time = localtime(&now.tv_sec);
    int year = time->tm_year + 1900;
    log("year = %d",year);
    
    char date1[24] = {0};
    char date[8] = {0};
    sprintf(date1,"%d:%02d:%02d:%02d:%02d:%02d",(int)time->tm_mday,time->tm_hour,time->tm_min,time->tm_sec);
    sprintf(date,"%02d:%02d",time->tm_min);
    return StringUtils::format("%s",date);
    
#endif
    
}


void ChartDemoScene::menuCloseCallback(Ref* pSender)
{
#if (CC_TARGET_PLATFORM == CC_PLATFORM_WP8) || (CC_TARGET_PLATFORM == CC_PLATFORM_WINRT)
	MessageBox("You pressed the close button. Windows Store Apps do not implement a close button.","Alert");
    return;
#endif
    
    Director::getInstance()->end();
    
#if (CC_TARGET_PLATFORM == CC_PLATFORM_IOS)
    exit(0);
#endif
}
原文链接：https://www.f2er.com/cocos2dx/347036.html

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