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/***************************************************************************
zoominterface.h - description
-------------------
begin : Fri Sep 12 2003
copyright : (C) 2003 by Friedrich W. H. Kossebau
email : Friedrich.W.H@Kossebau.de
***************************************************************************/
/***************************************************************************
* *
* This library is free software; you can redistribute it and/or *
* modify it under the terms of the GNU Library General Public *
* License version 2 as published by the Free Software Foundation. *
* *
***************************************************************************/
#ifndef ZOOMINTERFACE_H
#define ZOOMINTERFACE_H
namespace KHE
{
/**
* @short A simple interface for zooming
*
* This interface enables abstract linear zooming.
* It operates in sizes of font point size.
*
* @author Friedrich W. H. Kossebau <Friedrich.W.H@Kossebau.de>
* @see createBytesEditWidget(), zoomInterface()
* @since 3.2
*/
class ZoomInterface
{
public:
/** enlarges the display
* @param PointInc increment to the display size (in font point size)
*/
virtual void zoomIn( int PointInc ) = 0;
/** increases the display size by an arbitrary value, usually 1 font point
* @see zoomOut()
*/
virtual void zoomIn() = 0;
/** makes the display smaller
* @param PointDec decrement to the display size (in font point size)
*/
virtual void zoomOut( int PointDec ) = 0;
/** decreases the display size by an arbitrary value, usually 1 font point
* @see zoomIn()
*/
virtual void zoomOut() = 0;
/** sets the display size
* @param PointSize new display size (in font point size)
*/
virtual void zoomTo( int PointSize ) = 0;
/** resets the display to the default size */
virtual void unZoom() = 0;
};
/** tries to get the zoom interface of t
* @return a pointer to the interface, otherwise 0
* @author Friedrich W. H. Kossebau <Friedrich.W.H@Kossebau.de>
* @since 3.2
*/
template<class T>
ZoomInterface *zoomInterface( T *t )
{
if( !t )
return 0;
return ::tqqt_cast<KHE::ZoomInterface*>( t );
}
}
#endif
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