TLocalizableWrap.h

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#ifndef ibase_TLocalizableWrap_included
#define ibase_TLocalizableWrap_included


// Qt includes
#include <QtCore/QObject>
#include <QtCore/QCoreApplication>


namespace ibase
{


template <class Base>
class TLocalizableWrap: public Base
{
public:
       typedef Base BaseClass;

       TLocalizableWrap();

       virtual void EnableLocalization(bool enableLocalization = true);

protected:
       // abstract methods
       virtual void OnLanguageChanged() = 0;

private:
       class LanguageChangeEventFilter: public QObject
       {
       public:
              typedef QObject BaseClass;

              explicit LanguageChangeEventFilter(TLocalizableWrap& parent);

       protected:
              // reimplemented (QObject)
              bool eventFilter(QObject* sourcePtr, QEvent* eventPtr);

       private:
              TLocalizableWrap& m_parent;
       };

       LanguageChangeEventFilter m_languageChangeEventFilter;
};


// public methods of class TLocalizableWrap

template <class Base>
TLocalizableWrap<Base>::TLocalizableWrap()
       :m_languageChangeEventFilter(*this)
{
}


template <class Base>
void TLocalizableWrap<Base>::EnableLocalization(bool enableLocalization)
{
       QCoreApplication* applicationPtr = QCoreApplication::instance();
       if (applicationPtr != NULL){
              if (enableLocalization){
                     applicationPtr->installEventFilter(&m_languageChangeEventFilter);
              }
              else{
                     applicationPtr->removeEventFilter(&m_languageChangeEventFilter);
              }
       }
}


// public methods of the embedded class LanguageChangeEventFilter

template <class Base>
TLocalizableWrap<Base>::LanguageChangeEventFilter::LanguageChangeEventFilter(TLocalizableWrap& parent)
       :m_parent(parent)
{
}


// protected methods of the embedded class LanguageChangeEventFilter

// reimplemented (QObject)

template <class Base>
bool TLocalizableWrap<Base>::LanguageChangeEventFilter::eventFilter(QObject* sourcePtr, QEvent* eventPtr)
{
       if ((eventPtr->type() == QEvent::LanguageChange) && (sourcePtr == QCoreApplication::instance())){
              m_parent.OnLanguageChanged();
       }

       return BaseClass::eventFilter(sourcePtr, eventPtr);
}


} // namespace ibase


#endif // ibase_TLocalizableWrap_included