电子网站商业策划书_域名停靠网站免费进入_宁波seo教程_网络软文营销案例3篇

1 实现功能

动态加载不同语言

2 基础

【Qt QML】Qt Linguist使用方法，国际化，翻译

3 动态加载

3.1 languageset.h

#ifndef LANGUAGESET_H
#define LANGUAGESET_H#include <QObject>
#include <QGuiApplication>
#include <QtWidgets/QApplication>
#include <QQmlApplicationEngine>
#include <QTranslator>class LanguageSet : public QObject
{Q_OBJECT
public:explicit LanguageSet(QApplication& app, QQmlApplicationEngine& engine);Q_INVOKABLE void setLanguage(QString language);Q_INVOKABLE int getLanguageIdx(QString language);Q_INVOKABLE QString getLanguageName(int idx);private:QApplication* m_app;QQmlApplicationEngine* m_engine;QList<QString> m_langList;QTranslator* m_translator;signals:};#endif // LANGUAGESET_H

3.2 languageset.cpp

#include "languageset.h"LanguageSet::LanguageSet(QApplication& app, QQmlApplicationEngine& engine)
{m_app = &app;m_engine = &engine;m_translator = new QTranslator();m_langList.append("zh_CN");m_langList.append("en_US");
}/*** @brief 语言设置，支持qml* @param language： zh_CN, en_US*/
void LanguageSet::setLanguage(QString language)
{if(language == "zh_CN"){m_translator->load("zh_CN.qm");}else if(language == "en_US"){m_translator->load("en_US.qm");}m_app->installTranslator(m_translator);m_engine->retranslate();
}/*** @brief 获取语言编号* @param language* @return  zh_CN:0*          en_US:1*/
int LanguageSet::getLanguageIdx(QString language)
{for(int i=0; i<m_langList.length(); i++){if(language == m_langList.at(i)){return i;}}return 0;
}/*** @brief 获取语言名称* @param idx* @return*/
QString LanguageSet::getLanguageName(int idx)
{if(idx >= m_langList.length())m_langList.at(0);return m_langList.at(idx);
}

3.3 main.cpp

#include <QGuiApplication>
#include <QtWidgets/QApplication>
#include <QQmlApplicationEngine>
#include <QDir>
#include <QQmlContext>
#include "Cpp/languageset.h"int main(int argc, char *argv[])
{qputenv("QT_IM_MODULE", QByteArray("qtvirtualkeyboard"));#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)QCoreApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
#endifQApplication app(argc, argv);QQmlApplicationEngine engine;//Settings设置app.setOrganizationName("custom");app.setOrganizationDomain("com.custom");app.setApplicationName("test");QSettings _mGlobalSettings;//  ------  载入翻译 -------LanguageSet languageSet(app, engine);QString lang = _mGlobalSettings.value("_mLanguage", "zh_CN").toString();languageSet.setLanguage(lang);//暴露给qmlengine.rootContext()->setContextProperty("_mLanguageSet", &languageSet);//  ------  载入翻译 -------const QUrl url(QStringLiteral("qrc:/main.qml"));QObject::connect(&engine, &QQmlApplicationEngine::objectCreated,&app, [url](QObject *obj, const QUrl &objUrl) {if (!obj && url == objUrl)QCoreApplication::exit(-1);}, Qt::QueuedConnection);engine.load(url);return app.exec();
}

3.4 qml中使用

MyComboBox{id: _mLangheight: 50width: 500_mName: qsTr("语言")_mModel: ['简体中文', 'English']_mCurrentIndex: _mLanguageSet.getLanguageIdx(_mGlobalSettings.value("_mLanguage", "zh_CN"))on_MCurrentIndexChanged: {//语言修改if(_mCurrentText == "") return;_mGlobalSettings._mLanguage = _mLanguageSet.getLanguageName(_mCurrentIndex)_mLanguageSet.setLanguage(_mGlobalSettings._mLanguage)}
}

4. 注意

languageset.cpp中的setLanguage()函数要注意。

• m_translator要在堆上创建
• 如果在栈上创建，函数执行完毕就销毁了，导致翻译没有效果。

void LanguageSet::setLanguage(QString language)
{if(language == "zh_CN"){m_translator->load("zh_CN.qm");}else if(language == "en_US"){m_translator->load("en_US.qm");}m_app->installTranslator(m_translator);m_engine->retranslate();
}

5. 参考

• Qt之Qml 国际化—实现简易语言切换功能
• 使用qtranslator动态切换语言时遇到部分 tr 没有翻译的问题