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/***************************************************************************
Selection.h - Simple class for a selection
-------------------
begin : Sun May 06 2001
copyright : (C) 2000 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 SELECTION_H
#define SELECTION_H
#include "config.h"
#include "libkwave_export.h"
#include <QtGlobal>
#include <QObject>
#include "libkwave/Sample.h"
namespace Kwave
{
class LIBKWAVE_EXPORT Selection: public QObject
{
Q_OBJECT
public:
/**
* constructor.
* @param offset index of the first item
* @param length number of items
*/
Selection(sample_index_t offset, sample_index_t length);
/** copy constructor */
Selection(const Selection &other);
/** Destructor */
~Selection() override;
/**
* Sets a new offset and length.
* @param offset index of the first item
* @param length number of items
*/
void select(sample_index_t offset, sample_index_t length);
/** Clears the selection (0 samples at offset 0) */
inline void clear() {
select(0, 0);
}
/** Returns the index of the first selected item. */
inline sample_index_t offset() const {
return m_offset;
}
/** Returns the number of selected items. */
inline sample_index_t length() const {
return m_length;
}
/** Equal to offset(). */
inline sample_index_t first() const {
return offset();
}
/** Returns the index of the last selected item. */
inline sample_index_t last() const {
return m_offset + (m_length ? (m_length-1) : 0);
}
/** compare operator */
bool operator == (const Selection &other) const {
return ((m_offset == other.offset()) &&
(m_length == other.length()));
}
/** Assignment operator */
Selection & operator = (const Selection &source) {
m_offset = source.offset();
m_length = source.length();
return *this;
}
signals:
/**
* Emits a change in the selected range.
* @param offset index of the first selected items
* @param length number of selected items
*/
void changed(sample_index_t offset, sample_index_t length);
private:
/** index of the first selected item */
sample_index_t m_offset;
/** number of items */
sample_index_t m_length;
};
}
#endif /* SELECTION_H */
//***************************************************************************
//***************************************************************************
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