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/***************************************************************************
UndoReverseAction.h - undo action for the "reverse" effect
-------------------
begin : Wed Jun 24 2009
copyright : (C) 2009 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_REVERSE_ACTION_H
#define UNDO_REVERSE_ACTION_H
#include "config.h"
#include "libkwave/undo/UndoAction.h"
#include <QString>
namespace Kwave
{
class PluginManager;
class SignalManager;
class UndoReverseAction: public Kwave::UndoAction
{
public:
/** Constructor */
explicit UndoReverseAction(Kwave::PluginManager &plugin_manager);
/** Destructor */
~UndoReverseAction() override;
/**
* Returns a verbose short description of the action.
*/
QString description() override;
/**
* Returns the required amount of memory that is needed for storing
* undo data for the operation. This will be called to determine the
* free memory to be reserved.
* @note this is the first step (after the constructor)
*/
qint64 undoSize() override;
/**
* Returns the difference of needed memory that is needed for
* redo.
*/
qint64 redoSize() override;
/**
* 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)
*/
bool store(Kwave::SignalManager &manager) override;
/**
* Takes back an action by creating a new undo action (for further
* redo) and restoring the previous state.
* @param manager the SignalManager for modifying the signal
* @param with_redo if true a UndoAction for redo will be created
* @note The return value is allowed to be the same object. This
* is useful for objects that can re-use their data for
* undo/redo. You have to check for this when deleting an
* UndoAction object after undo.
*/
virtual UndoAction *undo(Kwave::SignalManager &manager, bool with_redo)
override;
private:
/** plugin manager, for emitting the sigCommand(reverse()) */
Kwave::PluginManager &m_plugin_manager;
};
}
#endif /* UNDO_REVERSE_ACTION_H */
//***************************************************************************
//***************************************************************************
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