/***************************************************************************
     UndoDeleteAction.h  -  UndoAction for deletion of a range of samples
			     -------------------
    begin                : Jun 08 2001
    copyright            : (C) 2001 by Thomas Eschenbacher
    email                : Thomas Eschenbacher <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 UNDO_DELETE_ACTION_H
#define UNDO_DELETE_ACTION_H

#include "config.h"

#include <QList>
#include <QString>

#include "libkwave/MetaDataList.h"
#include "libkwave/Sample.h"
#include "libkwave/String.h"
#include "libkwave/undo/UndoAction.h"

class QWidget;

namespace Kwave
{

    class SignalManager;

    class UndoDeleteAction: public Kwave::UndoAction
    {
    public:

	/**
	 * Constructor.
	 * @param parent_widget the widget used as parent for displaying
	 *                      error messages
	 * @param track_list list of affected tracks
	 * @param offset index of the first deleted sample
	 * @param length number of samples to delete
	 */
	UndoDeleteAction(QWidget *parent_widget,
	                 const QList<unsigned int> &track_list,
	                 sample_index_t offset, sample_index_t length);

	/** Destructor */
	virtual ~UndoDeleteAction();

	/** @see UndoAction::description() */
	virtual QString description();

	/** @see UndoAction::undoSize() */
	virtual qint64 undoSize();

	/** @see UndoAction::redoSize() */
	virtual qint64 redoSize();

	/**
	 * Stores the data needed for undo.
	 * @param manager the SignalManager for modifying the signal
	 * @note this is the second step, after size() has been called
	 * @return true if successful, false if failed (e.g. out of memory)
	 */
	virtual bool store(Kwave::SignalManager &manager);

	/**
	 * Copies the samples to be deleted to the internal buffer.
	 * @see UndoAction::undo()
	 */
	virtual Kwave::UndoAction *undo(Kwave::SignalManager &manager,
	                                bool with_redo);

	/** dump, for debugging purposes */
	virtual void dump(const QString &indent);

    private:

	/** parent widget for showing error messages */
	QWidget *m_parent_widget;

	/** storage for all deleted stripes */
	QList<Kwave::Stripe::List> m_stripes;

	/** storage for the affected meta data items */
	Kwave::MetaDataList m_meta_data;

	/** list of affected tracks */
	QList<unsigned int> m_track_list;

	/** first deleted sample */
	sample_index_t m_offset;

	/** number of deleted samples */
	sample_index_t m_length;

	/** memory needed for undo */
	unsigned int m_undo_size;

    };
}

#endif /* UNDO_DELETE_ACTION_H */

//***************************************************************************
//***************************************************************************
