EventListenerHelper.hxx

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#pragma once
 
#include <com/sun/star/lang/XComponent.hpp>
 
#include <algorithm>
#include <utility>
 
namespace com::sun::star::lang { class XEventListener; }
 
namespace chart
{
namespace EventListenerHelper
{
 
namespace impl
{
 
template< class InterfaceRef >
struct addListenerFunctor
{
    explicit addListenerFunctor( css::uno::Reference< css::lang::XEventListener > xListener ) :
            m_xListener(std::move( xListener ))
    {}
 
    void operator() ( const InterfaceRef & xObject )
    {
        css::uno::Reference< css::lang::XComponent >
              xBroadcaster( xObject, css::uno::UNO_QUERY );
        if( xBroadcaster.is() && m_xListener.is())
            xBroadcaster->addEventListener( m_xListener );
    }
private:
    css::uno::Reference< css::lang::XEventListener > m_xListener;
};
 
template< class InterfaceRef >
struct removeListenerFunctor
{
    explicit removeListenerFunctor( css::uno::Reference<  css::lang::XEventListener > xListener ) :
            m_xListener(std::move( xListener ))
    {}
 
    void operator() ( const InterfaceRef & xObject )
    {
        css::uno::Reference< css::lang::XComponent >
              xBroadcaster( xObject, css::uno::UNO_QUERY );
        if( xBroadcaster.is() && m_xListener.is())
            xBroadcaster->removeEventListener( m_xListener );
    }
private:
    css::uno::Reference< css::lang::XEventListener > m_xListener;
};
 
} //  namespace impl
 
template< class InterfaceRef >
void addListener(
    const InterfaceRef & xObject,
    const css::uno::Reference< css::lang::XEventListener > & xListener )
{
    if( xListener.is())
    {
        impl::addListenerFunctor< InterfaceRef > aFunctor( xListener );
        aFunctor( xObject );
    }
}
 
template< class Container >
void addListenerToAllElements(
    const Container & rContainer,
    const css::uno::Reference< css::lang::XEventListener > & xListener )
{
    if( xListener.is())
        std::for_each( rContainer.begin(), rContainer.end(),
                         impl::addListenerFunctor< typename Container::value_type >( xListener ));
}
 
template< class InterfaceRef >
void removeListener(
    const InterfaceRef & xObject,
    const css::uno::Reference< css::lang::XEventListener > & xListener )
{
    if( xListener.is())
    {
        impl::removeListenerFunctor< InterfaceRef > aFunctor( xListener );
        aFunctor( xObject );
    }
}
 
template< class Container >
void removeListenerFromAllElements(
    const Container & rContainer,
    const css::uno::Reference< css::lang::XEventListener > & xListener )
{
    if( xListener.is())
        std::for_each( rContainer.begin(), rContainer.end(),
                         impl::removeListenerFunctor< typename Container::value_type >( xListener ));
}
 
} //  namespace EventListenerHelper
} //  namespace chart
 
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