Qt GUI设计 界面语言动态切换（2）

接着上次做的语言切换

上次实现了语言动态切换，但是并不能保存，就是下次打开时语言又会恢复成原来的

这次程序中加入语言配置文件，每次语言修改会记录保存，下次打开时语言就是上次保存的。

代码如下

#include "dialog.h"

#include "ui_dialog.h"

#include <QDebug>

#include <QTranslator>

#include <iostream>

#include <QtCore>

Dialog::Dialog(QWidget *parent) :

    QDialog(parent),

    ui(new Ui::Dialog)

{

    ui->setupUi(this);

    this->setWindowTitle(tr("hello translator"));

    connect(this->ui->pushButton_2,SIGNAL(clicked()),this,SLOT(close()));

    connect(this->ui->comboBox,SIGNAL(activated(int)),SLOT(switchlanguage(int)));

    connect(this->ui->pushButton_chinese,SIGNAL(clicked()),SLOT(to_chinese()));

    connect(this->ui->pushButton_english,SIGNAL(clicked()),this,SLOT(to_english()));

}

Dialog::~Dialog()

{

    delete ui;

}

void Dialog::switchlanguage(int flag)

{

    qDebug("flag=%d",flag);

    QTranslator translator(qApp);

       bool b = false;

    if(flag==0)

    {

        //chinese

           b = translator.load("hellotr_CH.qm");

           if(b==false)

               qDebug("load err!");

           else

               qDebug("chinese load ok");

           qApp->installTranslator(&translator);

           this->ui->retranslateUi(this);

           QFile file("language_set.txt");

           if (file.open(QFile::WriteOnly)){

               QTextStream out(&file);

               out<<"hellotr_CH.qm";

               file.close();

           }

    }

    else if(flag==1)

    {

       // english

           b = translator.load("hellotr_EN.qm");

           if(b==false)

           {

               qDebug("load err!");

           }

           else

           {

               qDebug("english load ok");

               qApp->installTranslator(&translator);

               this->ui->retranslateUi(this);

               QFile file("language_set.txt");

               if (file.open(QFile::WriteOnly)){

                   QTextStream out(&file);

                   out<<"hellotr_EN.qm";

                   file.close();

               }

           }

    }

}

void Dialog:: to_chinese(void)

{

    qDebug("to chinese clicked");

    QTranslator translator(qApp);

       bool b = false;

       b = translator.load("hellotr_CH.qm");

       if(b==false)

           qDebug("load err!");

       else

       {

           qDebug("chinese load ok");

           qApp->installTranslator(&translator);

           this->ui->retranslateUi(this);

           this->ui->comboBox->setCurrentIndex(0);

           QFile file("language_set.txt");

           if (file.open(QFile::WriteOnly)){

               QTextStream out(&file);

               out<<"hellotr_CH.qm";

               file.close();

           }

        }

}

void Dialog::to_english(void)

{

    qDebug("to_english clicked");

    QTranslator translator(qApp);

       bool b = false;

       b = translator.load("hellotr_EN.qm");

       if(b==false)

           qDebug("load err!");

       else

       {

           qDebug("english load ok");

           qApp->installTranslator(&translator);

           this->ui->retranslateUi(this);

           this->ui->comboBox->setCurrentIndex(1);

           QFile file("language_set.txt");

           if (file.open(QFile::WriteOnly)){

               QTextStream out(&file);

               out<<"hellotr_EN.qm";

               file.close();

           }

       }

}

 

#include <QtGui/QApplication>

#include "dialog.h"

#include <QTranslator>

#include <QDebug>

#include <QTextCodec>

#include <iostream>

#include <QtCore>

int main(int argc, char *argv[])

{

    QApplication a(argc, argv);

    QFile file("language_set.txt");

    QString language;

    if(file.open(QFile::ReadOnly))

    {

        QTextStream in(&file);

        in>>language;

        qDebug("language=%s",qPrintable(language));

    }

    QTranslator translator(0);

    bool b = false;

    b = translator.load(language);

    if(b==false)

        qDebug("load err!");

    else

        qDebug("load ok");

    a.installTranslator(&translator);

    Dialog w;

    w.show();

    return a.exec();

}