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/***************************************************************************
libgui/Zoomable.h - Interface for a GUI element that supports zooming
-------------------
begin : 2014-09-21
copyright : (C) 2014 by Thomas.Eschenbacher
email : Thomas.Eschenbacher@gmx.de
***************************************************************************/
/***************************************************************************
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
***************************************************************************/
#ifndef ZOOMABLE_H
#define ZOOMABLE_H
#include "config.h"
#include "libkwave/Sample.h"
namespace Kwave
{
class Zoomable
{
public:
/** default constructor */
Zoomable() {}
/** destructor */
virtual ~Zoomable() {}
/**
* Returns the width of the visible area
* @return width of visible area in pixels
*/
virtual int visibleWidth() const = 0;
/** Returns the width of the current view in samples */
virtual sample_index_t visibleSamples() const = 0;
/** Returns the current zoom factor [samples/pixel] */
virtual double zoom() const = 0;
/**
* Set a new zoom factor [samples/pixel]
* @param factor new zoom value
*/
virtual void setZoom(double factor) = 0;
/**
* Scrolls the display so that the given position gets visible,
* centered within the display if possible.
*/
virtual void scrollTo(sample_index_t pos) = 0;
};
}
#endif /* ZOOMABLE_H */
//***************************************************************************
//***************************************************************************
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