TVisualChangesHandlerWrap.h

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/********************************************************************************
**  This file is part of the ICF Framework. Copyright (C) Witold Gantzke & Kirill Lepskiy
**  ICF Framework may be used under the terms of the LGPL License v. 2.1 by the Free Software Foundation.
********************************************************************************/
 
#pragma once
 
 
// Qt includes
#include <QtCore/QObject>
#include <QtCore/QCoreApplication>
 
 
namespace ibase
{
 
 
template <class Base>
class TVisualChangesHandlerWrap: public Base
{
public:
    typedef Base BaseClass;
 
    template<typename... Args>
    TVisualChangesHandlerWrap(Args&&... args);
 
    virtual void EnableVisualChangesHandler(bool enableLocalization = true);
 
protected:
    // Methods signaling visual changes
    virtual void OnLanguageChanged();
    virtual void OnDesignSchemaChanged();
 
private:
    class EventFilter: public QObject
    {
    public:
        typedef QObject BaseClass;
 
        explicit EventFilter(TVisualChangesHandlerWrap& parent);
 
    protected:
        // reimplemented (QObject)
        bool eventFilter(QObject* sourcePtr, QEvent* eventPtr);
 
    private:
        TVisualChangesHandlerWrap& m_parent;
    };
 
    EventFilter m_eventFilter;
    bool m_isFilterInstalled;
};
 
 
// public methods of class TVisualChangesHandlerWrap
 
template <class Base>
template<typename... Args>
TVisualChangesHandlerWrap<Base>::TVisualChangesHandlerWrap(Args&&... args)
:   BaseClass(args...),
    m_eventFilter(*this),
    m_isFilterInstalled(false)
{
}
 
 
template <class Base>
void TVisualChangesHandlerWrap<Base>::EnableVisualChangesHandler(bool enableLocalization)
{
    QCoreApplication* applicationPtr = QCoreApplication::instance();
    if (applicationPtr != nullptr){
        if (enableLocalization){
            if (!m_isFilterInstalled){
                applicationPtr->installEventFilter(&m_eventFilter);
 
                m_isFilterInstalled = true;
            }
        }
        else{
            if (m_isFilterInstalled){
                applicationPtr->removeEventFilter(&m_eventFilter);
 
                m_isFilterInstalled = false;
            }
        }
    }
}
 
 
// protected methods
 
template <class Base>
void TVisualChangesHandlerWrap<Base>::OnLanguageChanged()
{
}
 
 
template <class Base>
void TVisualChangesHandlerWrap<Base>::OnDesignSchemaChanged()
{
}
 
 
// public methods of the embedded class EventFilter
 
template <class Base>
TVisualChangesHandlerWrap<Base>::EventFilter::EventFilter(TVisualChangesHandlerWrap& parent)
:   m_parent(parent)
{
}
 
 
// protected methods of the embedded class EventFilter
 
// reimplemented (QObject)
 
template <class Base>
bool TVisualChangesHandlerWrap<Base>::EventFilter::eventFilter(QObject* sourcePtr, QEvent* eventPtr)
{
    if (sourcePtr == QCoreApplication::instance()){
        switch (eventPtr->type()){
        case QEvent::QEvent::ApplicationPaletteChange:
            m_parent.OnDesignSchemaChanged();
            break;
 
        case QEvent::QEvent::LanguageChange:
            m_parent.OnLanguageChanged();
            break;
 
        default:
            break;
        }
    }
 
    return BaseClass::eventFilter(sourcePtr, eventPtr);
}
 
 
} // namespace ibase