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#ifndef __kparts__genericfactory_h__
#define __kparts__genericfactory_h__
#include <kparts/factory.h>
#include <kparts/part.h>
#include <kgenericfactory.h>
#include <kaboutdata.h>
#include <kdebug.h>
namespace KParts
{
/**
* @internal
*/
template <class T>
class GenericFactoryBase : public KParts::Factory
{
public:
GenericFactoryBase()
{
if ( s_self )
kdWarning() << "KParts::GenericFactory instantiated more than once!" << endl;
s_self = this;
}
virtual ~GenericFactoryBase()
{
delete s_aboutData;
delete s_instance;
s_aboutData = 0;
s_instance = 0;
s_self = 0;
}
static KInstance *instance();
static KAboutData *aboutData();
protected:
virtual KInstance *createInstance()
{
return new KInstance( aboutData() );
}
virtual void virtual_hook( int id, void *data )
{
if ( id != VIRTUAL_QUERY_INSTANCE_PARAMS ) {
KParts::Factory::virtual_hook( id, data );
return;
}
QueryInstanceParams *params = reinterpret_cast<QueryInstanceParams *>( data );
params->instance = instance();
}
private:
static GenericFactoryBase<T> *s_self;
static KInstance *s_instance;
static KAboutData *s_aboutData;
};
/**
* A template for a KParts::Factory implementation. It implements the pure virtual
* createPartObject method by instantiating the template argument when requested
* through the className field. In addition it is a container for a part's KInstance
* object, by providing a static KInstance *instance() method.
*
* The template argument has to inherit from KParts::Part and has to implement two methods:
* 1) There needs to be a public constructor with the following signature:
* MyPart( TQWidget *parentWidget, const char *widgetName, TQObject *parent, const char *name, const TQStringList& args )
*
* 2) It needs to provide one static method to create a KAboutData object per
* request, holding information about the component's name, its authors, license, etc.
* The signature of that static method has to be
* KAboutData *createAboutData()
*
* The template will take care of memory management of the KInstance and the KAboutData object,
* meaning ownership of what createAboutData returns is passed to the caller (this template) .
*
* For advanced use you can also inherit from the template and re-implement additionally the
* virtual KInstance *createInstance() method, for example in case you want to extend the
* paths of your instance's KStandardDirs object.
*
* If a KParts::ReadOnlyPart is requested through this factory and the template argument
* implements a KParts::ReadWritePart then setReadWrite( false ) will automatically be
* called in createPartObject.
*
* Use the factory through the K_EXPORT_COMPONENT_FACTORY macro, like that:
* \code
* typedef KParts::GenericFactory<YourKPart> YourKPartFactory;
* K_EXPORT_COMPONENT_FACTORY( yourlibrary, YourKPartFactory )
* \endcode
* yourlibrary is the library name that you compiled your KPart into.
*/
template <class T>
class GenericFactory : public GenericFactoryBase<T>
{
public:
GenericFactory() { }
virtual KParts::Part *createPartObject( TQWidget *parentWidget, const char *widgetName,
TQObject *parent, const char *name,
const char *className,
const TQStringList &args )
{
T *part = KDEPrivate::ConcreteFactory<T>::create( parentWidget,
widgetName,
parent,
name,
className,
args );
if ( part && !qstrcmp( className, "KParts::ReadOnlyPart" ) )
{
KParts::ReadWritePart *rwp = tqt_dynamic_cast<KParts::ReadWritePart *>( part );
if ( rwp )
rwp->setReadWrite( false );
}
return part;
}
};
template <class T1, class T2>
class GenericFactory< KTypeList<T1, T2> > : public GenericFactoryBase<T1>
{
public:
GenericFactory() { }
virtual KParts::Part *createPartObject( TQWidget *parentWidget, const char *widgetName,
TQObject *parent, const char *name,
const char *className,
const TQStringList &args )
{
TQObject *object = KDEPrivate::MultiFactory< KTypeList<T1, T2> >::create( parentWidget,
widgetName,
parent, name,
className,
args );
// (this cast is guaranteed to work...)
KParts::Part *part = tqt_dynamic_cast<KParts::Part *>( object );
if ( part && !qstrcmp( className, "KParts::ReadOnlyPart" ) )
{
KParts::ReadWritePart *rwp = tqt_dynamic_cast<KParts::ReadWritePart *>( part );
if ( rwp )
rwp->setReadWrite( false );
}
return part;
}
};
/**
* @internal
*/
template <class T>
GenericFactoryBase<T> *GenericFactoryBase<T>::s_self = 0;
/**
* @internal
*/
template <class T>
KInstance *GenericFactoryBase<T>::s_instance = 0;
/**
* @internal
*/
template <class T>
KAboutData *GenericFactoryBase<T>::s_aboutData = 0;
/**
* @internal
*/
template <class T>
KInstance *GenericFactoryBase<T>::instance()
{
if ( !s_instance )
{
if ( s_self )
s_instance = s_self->createInstance();
else
s_instance = new KInstance( aboutData() );
}
return s_instance;
}
/**
* @internal
*/
template <class T>
KAboutData *GenericFactoryBase<T>::aboutData()
{
if ( !s_aboutData )
s_aboutData = T::createAboutData();
return s_aboutData;
}
}
#endif
/**
* vim: et sw=4
*/
|
