qt语言国际化（翻译），并实现多窗口同时翻译

https://blog.csdn.net/qq_15181569/article/details/135934033

一、.pro文件中添加支持的语言

在.pro文件中添加下面几句，支持中文和英文

TRANSLATIONS = lanague_cn.ts\
                lanague_en.ts
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二、通过qt语言家更新翻译生成.ts文件

完成以后在工程目录可以看到.ts文件

三、通过linguist翻译文件

打开文件

将两个文件同时选中，打开。

四、Qt语言家发布文字生成.qm文件

五、使用翻译文件进行多语言切换

为了方便多窗口同时切换，使用单例类进行，源码如下：

languageHelper.h
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#ifndef LANGUAGEHELPER_H
#define LANGUAGEHELPER_H


#include <QObject>

#include <QMutex>

#include <QTranslator>

#include <QApplication>




class LanguageHelper : public QObject

{

Q_OBJECT

public:

enum language {

chinese,

english,

undefined

};

signals:

void languageChaned();

private:

explicit LanguageHelper();

~LanguageHelper();

LanguageHelper(LanguageHelper&) = delete;

LanguageHelper operator=(const LanguageHelper &) = delete;




public:

static LanguageHelper *getInstance()

{

static QMutex mutex;



    mutex<span class="token punctuation">.</span><span class="token function">lock</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token keyword">if</span><span class="token punctuation">(</span>languageHelper <span class="token operator">==</span> <span class="token keyword">nullptr</span><span class="token punctuation">)</span>
    <span class="token punctuation">{<!-- --></span>
        languageHelper <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token function">LanguageHelper</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token punctuation">}</span>
    mutex<span class="token punctuation">.</span><span class="token function">unlock</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token keyword">return</span> languageHelper<span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token keyword">static</span> <span class="token keyword">void</span> <span class="token function">quit</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">bool</span> <span class="token function">changeLanguage</span><span class="token punctuation">(</span>language l<span class="token punctuation">)</span><span class="token punctuation">;</span>




private:

static LanguageHelper languageHelper;

QTranslator translator = nullptr;

language currentLanguage = language::undefined;

};




#endif // LANGUAGEHELPER_H


    mutex<span class="token punctuation">.</span><span class="token function">lock</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token keyword">if</span><span class="token punctuation">(</span>languageHelper <span class="token operator">==</span> <span class="token keyword">nullptr</span><span class="token punctuation">)</span>
    <span class="token punctuation">{<!-- --></span>
        languageHelper <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token function">LanguageHelper</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token punctuation">}</span>
    mutex<span class="token punctuation">.</span><span class="token function">unlock</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token keyword">return</span> languageHelper<span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token keyword">static</span> <span class="token keyword">void</span> <span class="token function">quit</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">bool</span> <span class="token function">changeLanguage</span><span class="token punctuation">(</span>language l<span class="token punctuation">)</span><span class="token punctuation">;</span>

languageHelper.cpp
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#include "languageHelper.h"


LanguageHelper *LanguageHelper::languageHelper = nullptr;




LanguageHelper::LanguageHelper()

{

this->translator = new QTranslator();




}




LanguageHelper::~LanguageHelper()

{

if(this->translator)

{

delete this->translator;

this->translator = nullptr;

}

qDebug()<<"~LanguageHelper";

}




void LanguageHelper::quit()

{

if(languageHelper)

delete languageHelper;

}




bool LanguageHelper::changeLanguage(language l)

{

if(l  this->currentLanguage || l  language::undefined)

return true;

bool ret = false;

switch(l)

{

case chinese:

{

if (this->translator != nullptr)

qApp->removeTranslator(this->translator);

ret = this->translator->load("E:/CompanyProjects/KPMG/winccTemp/language/Language/lanague_cn.qm");

if (ret)

{

bool install = qApp->installTranslator(this->translator);

if (install == false)

return false;

}

else

return false;



    <span class="token punctuation">}</span><span class="token keyword">break</span><span class="token punctuation">;</span>
    <span class="token keyword">case</span> english<span class="token operator">:</span>
    <span class="token punctuation">{<!-- --></span>
        <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token keyword">this</span><span class="token operator">-&gt;</span>translator <span class="token operator">!=</span> <span class="token keyword">nullptr</span><span class="token punctuation">)</span>
            qApp<span class="token operator">-&gt;</span><span class="token function">removeTranslator</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token operator">-&gt;</span>translator<span class="token punctuation">)</span><span class="token punctuation">;</span>
        ret <span class="token operator">=</span> <span class="token keyword">this</span><span class="token operator">-&gt;</span>translator<span class="token operator">-&gt;</span><span class="token function">load</span><span class="token punctuation">(</span><span class="token string">"E:/CompanyProjects/KPMG/winccTemp/language/Language/lanague_en.qm"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token keyword">if</span> <span class="token punctuation">(</span>ret<span class="token punctuation">)</span>
        <span class="token punctuation">{<!-- --></span>
            <span class="token keyword">bool</span> install <span class="token operator">=</span> qApp<span class="token operator">-&gt;</span><span class="token function">installTranslator</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token operator">-&gt;</span>translator<span class="token punctuation">)</span><span class="token punctuation">;</span>
            <span class="token keyword">if</span> <span class="token punctuation">(</span>install <span class="token operator">==</span> <span class="token boolean">false</span><span class="token punctuation">)</span>
                <span class="token keyword">return</span> <span class="token boolean">false</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span>
        <span class="token keyword">else</span>
            <span class="token keyword">return</span> <span class="token boolean">false</span><span class="token punctuation">;</span>
    <span class="token punctuation">}</span><span class="token keyword">break</span><span class="token punctuation">;</span>
    <span class="token keyword">case</span> undefined<span class="token operator">:</span>
    <span class="token punctuation">{<!-- --></span>

    <span class="token punctuation">}</span><span class="token keyword">break</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>ret<span class="token punctuation">)</span> <span class="token punctuation">{<!-- --></span>
    <span class="token keyword">this</span><span class="token operator">-&gt;</span>currentLanguage <span class="token operator">=</span> l<span class="token punctuation">;</span>
    emit <span class="token function">languageChaned</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>




}


    <span class="token punctuation">}</span><span class="token keyword">break</span><span class="token punctuation">;</span>
    <span class="token keyword">case</span> english<span class="token operator">:</span>
    <span class="token punctuation">{<!-- --></span>
        <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token keyword">this</span><span class="token operator">-&gt;</span>translator <span class="token operator">!=</span> <span class="token keyword">nullptr</span><span class="token punctuation">)</span>
            qApp<span class="token operator">-&gt;</span><span class="token function">removeTranslator</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token operator">-&gt;</span>translator<span class="token punctuation">)</span><span class="token punctuation">;</span>
        ret <span class="token operator">=</span> <span class="token keyword">this</span><span class="token operator">-&gt;</span>translator<span class="token operator">-&gt;</span><span class="token function">load</span><span class="token punctuation">(</span><span class="token string">"E:/CompanyProjects/KPMG/winccTemp/language/Language/lanague_en.qm"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token keyword">if</span> <span class="token punctuation">(</span>ret<span class="token punctuation">)</span>
        <span class="token punctuation">{<!-- --></span>
            <span class="token keyword">bool</span> install <span class="token operator">=</span> qApp<span class="token operator">-&gt;</span><span class="token function">installTranslator</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token operator">-&gt;</span>translator<span class="token punctuation">)</span><span class="token punctuation">;</span>
            <span class="token keyword">if</span> <span class="token punctuation">(</span>install <span class="token operator">==</span> <span class="token boolean">false</span><span class="token punctuation">)</span>
                <span class="token keyword">return</span> <span class="token boolean">false</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span>
        <span class="token keyword">else</span>
            <span class="token keyword">return</span> <span class="token boolean">false</span><span class="token punctuation">;</span>
    <span class="token punctuation">}</span><span class="token keyword">break</span><span class="token punctuation">;</span>
    <span class="token keyword">case</span> undefined<span class="token operator">:</span>
    <span class="token punctuation">{<!-- --></span>

    <span class="token punctuation">}</span><span class="token keyword">break</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>ret<span class="token punctuation">)</span> <span class="token punctuation">{<!-- --></span>
    <span class="token keyword">this</span><span class="token operator">-&gt;</span>currentLanguage <span class="token operator">=</span> l<span class="token punctuation">;</span>
    emit <span class="token function">languageChaned</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>

通过按钮切换语言：

void MainWindow::on_btnChinese_clicked()
{
    LanguageHelper::getInstance()->changeLanguage(LanguageHelper::chinese);
}


void MainWindow::on_btnEnglish_clicked()

{

LanguageHelper::getInstance()->changeLanguage(LanguageHelper::english);

}


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需要注意的是，在需要实时翻译的界面需要实现languageChaned信号的绑定，然后调用ui->retranslateUi(this);函数，如下：

    connect(LanguageHelper::getInstance(),&LanguageHelper::languageChaned,this,
            [=]()
            {
                ui->retranslateUi(this);
            });
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