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默默地EEer,原文地址：
http://www.cnblogs.com/hebaichuanyeah/p/5628012.html
Qt国际化可能是我最喜的Qt功能。
国际化是多语言切换支持。
Qt实现国际化需要满足两个条件
1.所有Qstring字符串用tr()修饰。
2.导入翻译文件。
改造上一篇文章线程的例子，添加国际化支持：
http://www.cnblogs.com/hebaichuanyeah/p/5618781.html
把所有字符串全部用tr()修饰，增加一个语言切换下拉选项。
TRANSLATIONS += zh.ts en.ts
利用lupdate命令，或者QtCreator生成.ts的XML文件。
2.翻译修改.ts xml文件。修改格式如下：
3.运行lrelease命令生成二进制翻译文件.qm，并在程序中导入生成的.qm文件，即可自动翻译。
运行效果：
中文界面
英文界面
thread.h
#include "QThread"
class Thread : public QThread
{
Q_OBJECT
public:
Thread();
// void setMessage(const Qstring &message);
void setRun();
void stop();
bool getState();
protected:
void run();
private:
// QString messageStr;
volatile bool enable;
signals:
void OutMessage(QString message);
};
thread.cpp
#include "thread.h"
Thread::Thread()
{
enable = true;
}
void Thread::run()
{
while(true)
{
if(enable)
{
this->OutMessage(tr("I‘m run : thread 1"));
msleep(2100);
}
}
}
void Thread::stop()
{
enable = false;
}
void Thread::setRun()
{
enable = true;
}
bool Thread::getState()
{
return enable;
}
mainwindow.cpp
#include "mainwindow.h"
#include <QPainter>
MainWindow :: MainWindow()
{
mainWindow = new QWidget;
this->setCentralWidget(mainWindow);
backThread = new Thread();
backThread->start();
languageCombo = new QComboBox();
languageCombo->addItem(tr("english"));
languageCombo->addItem(tr("chinese"));
languageCombo->setStyleSheet("font-size : 15px");
clearButton = new QPushButton(tr("clear"));
clearButton->setSizePolicy(QSizePolicy::Fixed,QSizePolicy::Fixed);
clearButton->setStyleSheet("font-size : 15px");
runStopButton = new QPushButton(tr("stop"));
runStopButton->setStyleSheet("font-size : 15px");
messageEdit = new QTextEdit();
messageEdit->setReadOnly(true);
messageEdit->setStyleSheet("font-size : 17px");
mainLayout = new QGridLayout;
mainLayout->addWidget(messageEdit,0,0,5,5);
mainLayout->addWidget(clearButton,1,5,1,1);
mainLayout->addWidget(runStopButton,0,5,1,1);
mainLayout->addWidget(languageCombo,2,5,1,1);
mainWindow->setLayout(mainLayout);
QObject::connect(clearButton,SIGNAL(clicked()),this,SLOT(clearMessage()));
QObject::connect(runStopButton,SIGNAL(clicked()),this,SLOT(runStopThread()));
QObject::connect(languageCombo,SIGNAL(currentIndexChanged(int)),this,SLOT(languageChange(int)));
QObject::connect(backThread,SIGNAL(OutMessage(QString)),this,SLOT(updateMessage(QString)));
this->setWindowTitle(tr("thread test~"));
this->setStyleSheet("font-size : 15px");
this->resize(QSize(350,135));
}
MainWindow :: ~MainWindow()
{
mainWindow->deleteLater();
mainLayout->deleteLater();
messageEdit->deleteLater();
clearButton->deleteLater();
runStopButton->deleteLater();
}
void MainWindow::updateMessage(QString message)
{
messageEdit->append(message);
}
void MainWindow::clearMessage()
{
messageEdit->clear();
}
void MainWindow::runStopThread()
{
if(backThread->getState())
{
backThread->stop();
runStopButton->setText(tr("run"));
}
else
{
backThread->setRun();
runStopButton->setText(tr("stop"));
}
}
void MainWindow::languageChange(int index)
{
switch(index)
{
case 0:
translator->load(QString("en.qm"));
break;
case 1:
translator->load(QString("zh.qm"));
break;
}
updateShow();
}
void MainWindow::setTranslate(QTranslator * tran)
{
translator = tran;
}
void MainWindow::updateShow()
{
if(!backThread->getState())
{
runStopButton->setText(tr("run"));
}
else
{
runStopButton->setText(tr("stop"));
}
setWindowTitle(tr("thread test~"));
clearButton->setText(tr("clear"));
}
void MainWindow::keyPressEvent(QKeyEvent * key)
{
close();
}
mainwindow.h
#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <QMainWindow>
#include <QLabel>
#include <QGridLayout>
#include <QPushButton>
#include <QTextEdit>
#include <QDoubleValidator>
#include <QComboBox>
#include <QTranslator>
#include "thread.h"
#define PI 3.14592653589
class MainWindow : public QMainWindow
{
Q_OBJECT
public:
MainWindow();
~MainWindow();
void setTranslate(QTranslator * tran);
private:
QWidget* mainWindow;
QGridLayout * mainLayout;
QTextEdit * messageEdit;
QPushButton * clearButton;
QPushButton * runStopButton;
Thread * backThread;
QComboBox * languageCombo;
QTranslator * translator;
void updateShow();
void keyPressEvent(QKeyEvent * key);
private slots:
void updateMessage(QString message);
void clearMessage();
void runStopThread();
void languageChange(int index);
};
#endif
main.cpp
#include <QApplication>
#include <QFont>
#include <QTranslator>
#include <QTextCodec>
#include "mainwindow.h"
int main(int argc ,char* argv[])
{
QApplication app(argc,argv);
QTranslator translator;
translator.load(QString("zh.qm"));
app.installTranslator(&translator);
MainWindow myWindow;
myWindow.setTranslate(&translator);
myWindow.show();
return app.exec();
}
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原文地址：http://www.cnblogs.com/hebaichuanyeah/p/5628012.html
