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/****************************************************************************
**
** Copyright (C) 2002 NVIDIA Corporation.
** Copyright (C) 2017 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of Qt 3D Studio.
**
** $QT_BEGIN_LICENSE:GPL-EXCEPT$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3 as published by the Free Software
** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef INCLUDED_CMD_STACK_H
#define INCLUDED_CMD_STACK_H 1
#pragma once
#include "Qt3DSString.h"
class CCmd;
class ICmdStackModifier;
//=============================================================================
/**
* Class to listen for changes on the command listener.
*/
//=============================================================================
class CModificationListener
{
public:
//==========================================================================
/**
* This is called every time a command is executed which modifies the
* modified flag on the command stack. It is used to notify the interested
* document that a change has occurred.
*/
//==========================================================================
virtual void SetCommandModifiedFlag(bool inModified) = 0;
//==========================================================================
/**
* Called when a command modifies one or more of the views and the views
* need to be redrawn.
*
* @param inUpdateFlags flags of what needs to be redrawn.
*/
//==========================================================================
virtual void CommandUpdate(unsigned long inUpdateFlags) = 0;
};
class CCmdStack
{
public:
typedef std::vector<CCmd *> TCmdList;
CCmdStack();
virtual ~CCmdStack();
bool ExecuteCommand(CCmd *inCommand);
void Undo();
void Redo();
bool CanUndo();
bool CanRedo();
bool isUndoingOrRedoing() const;
void RemoveLastUndo();
QString GetUndoDescription();
QString GetRedoDescription();
void CommitLastCommand();
void Clear();
void ClearInvalid();
void SetCommandStackModifier(ICmdStackModifier *inModifier);
void SetModificationListener(CModificationListener *inListener);
TCmdList GetUndoStack();
TCmdList GetRedoStack();
void EmptyRedoStack();
protected:
void EmptyUndoStack();
ICmdStackModifier *m_CommandStackModifier;
TCmdList m_UndoList;
TCmdList m_RedoList;
bool m_undoingOrRedoing = false;
unsigned long m_MaxUndoStackSize;
CModificationListener *m_Listener;
};
#endif // INCLUDED_CMD_STACK_H
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