QT翻译

代码中的可翻译字符串

继承自QObject的类

要加上Q_OBJECT, 不然context会默认继承基类的.

Developers subclassing QObject must use the Q_OBJECT macro in their class definition to override the translation context.
...
If Q_OBJECT is not used in a class definition, the context will be inherited from the base class.

非继承自QObject的类

给类加上Q_DECLARE_TR_FUNCTIONS()宏.

class MyClass
{
    Q_DECLARE_TR_FUNCTIONS(MyClass)

public:
    MyClass()
    {
        QString str = tr("example");
    }
    // ...
};

类外翻译

用QObject::tr()生成的翻译文件里没有contenxt可能会出现冲突, 所以更倾向于用QApplication::translate().

If the quoted text is not in a member function of a QObject subclass, use either the tr() function of an appropriate class, or the QCoreApplication::translate() function directly.

加载翻译文件

代码中用QTranslator加载lrealse生成的.qm文件.

QTranslator translator();
if (translator.load("foo.qm"))
    qApp->installTranslator(&translator);

相关工具

lupdate

扫描源代码生成翻译文件(.ts)

$ lupdate -source-language en_US -target-language zh_CN ./src -ts ./ts/translation.ts

linguist

用于编辑lupdate生成的翻译文件(.ts), 图形界面没什么可说的. 不过它的自动翻译(Batch Transition)功能还是值得一提的.

Use the batch translation feature of Qt Linguist to automatically translate source texts that are also in a phrase book.

• 界面入口:
  Edit > Batch Translation

• Phase Book(翻译词典):
  Phrases > New Phrase Book
  Phrases > Open Phrase Book
  Phrases > Edit Phrase Book

lrease

把.ts文件编译为QTranslator的资源文件.qm

$ lrease ts-file -qm qm-file