详解Qt如何实现一键加载qm文件

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目录

• 背景
• .h
• .cpp
• 使用

背景

多个子项目，分别翻译生成的qm文件，如何一键加载？

.h

#include <QtCore/QObject>
#include <QtCore/QTranslator>
 
class LanguageSelector:public QObeject{
    Q_OBJECT
public:
    ~LanguageSelector() override = default;
    void setLanguage(const QString &l);
    QString getLanguage();
    void addLanguageFile(const QString &n);
    void removeLanguageFile(const QString &n);
    void reload();
    static LanguageSelector *getInstance();
signals:
    void languageChanged(const QString &l);
privite:
    LanguageSelector();
    static LanguageSelector* instance;
    static constexpr char CONFIGER_KEY[] = "system/language";
    QString baseDir;
    QList<QString> languageFiles;
    QList<QTranslator *> translations;
}

.cpp

#include "languageselector.h"
#include <QApplication>
#include <QCoreApplication>
#include <QDebug>
#include <QStringBuilder>
#include <QSettings>
 
LanguageSelector *LanguageSelector::instance = nullptr;
constexpr char LanguageSelector::CONFIGER_KEY[];
QString LanguageSelector::getLanguage()
{
    return QSettings::value( CONFIGER_KEY, defaultValue );
}
 
void LanguageSelector::setLanguage(const QString &language)
{
    QSettings qs;
    auto ov = QSettings::value( CONFIGER_KEY, defaultValue );
    qs::setValue( CONFIGER_KEY, language);
    if(ov != l){
        reload();
        emit languageChanged( language);
    }
}
 
LanguageSelector *LanguageSelector::getInstance()
{
    if(!instance){
        instance = new LanguageSelector;
    }
    return instance;
}
 
LanguageSelector::LanguageSelector()
    : baseDir( "i18n" ) {}
 
void LanguageSelector::addLanguageFile(const QString &name)
{
    if(name.isEmpty()){
        return;
    }
    languageFiles.append(name);
}
 
void LanguageSelector::removeLanguageFile(const QString &name)
{
    if(name.isEmpty()){
        return;
    }
    languageFiles.removeOne(name);
}
 
void LanguageSelector::reload()
{
    auto language = getLanguage();
    QString qmBase = QApplication::applicationDirPath() + "/" + baseDir;
    if(!qmBase.isEmpty() && !qmBase.endWith("/")){
        qmBase += "/";
    }
    if(!translations.isEmpty()){
        for(auto const t : translations){
            QCoreApplication::removeTranslator(t);
            t->deleteLater();
        }
    }
    for(auto const &qm ：languageFiles){
    auto *t = new QTranslator(this);
    if(t->load(qmBase % qm % "_" % language ))
        translations.append(t);
        QCoreApplication::installTranslator(t);
    }else{
        qDebug() << "can not load lang file:" << qm << ", language" << language ;
    }
}

使用

main中，节目构造之前添加：

      auto ls = LanguageSelector::getInstance();
            ls->addLangFile( "test" );
            ls->addLangFile( "local" );
            ls->addLangFile( "remote" );
            ls->reload();

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