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/******************************************************************************
*
* Project: OpenCPN
* Purpose: Framework for Undo features
* Author: Jesper Weissglas
*
***************************************************************************
* Copyright (C) 2012 by David S. Register *
* *
* 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. *
* *
* This program is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License *
* along with this program; if not, write to the *
* Free Software Foundation, Inc., *
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. *
***************************************************************************
*
*
*/
#ifndef UNDO_H
#define UNDO_H
#include <vector>
#include <deque>
enum UndoType {
Undo_CreateWaypoint,
Undo_DeleteWaypoint,
Undo_AppendWaypoint,
Undo_MoveWaypoint
};
enum UndoBeforePointerType {
Undo_IsOrphanded,
Undo_NeedsCopy,
Undo_HasParent
};
typedef void* UndoItemPointer;
class UndoAction {
public:
~UndoAction();
wxString Description();
UndoType type;
std::vector<UndoItemPointer> before;
std::vector<UndoBeforePointerType> beforeType;
std::vector<UndoItemPointer> after;
std::vector<UndoItemPointer> selectable;
};
class Undo {
public:
Undo( ChartCanvas *parent);
~Undo();
bool AnythingToUndo();
bool AnythingToRedo();
void InvalidateRedo();
void InvalidateUndo();
void Invalidate();
bool InUndoableAction() { return isInsideUndoableAction; }
UndoAction* GetNextUndoableAction();
UndoAction* GetNextRedoableAction();
bool UndoLastAction();
bool RedoNextAction();
bool BeforeUndoableAction( UndoType type, UndoItemPointer before, UndoBeforePointerType beforeType,
UndoItemPointer selectable );
bool AfterUndoableAction( UndoItemPointer after );
bool CancelUndoableAction( bool noDataDelete = false );
ChartCanvas *GetParent(){ return m_parent; }
private:
ChartCanvas *m_parent;
bool isInsideUndoableAction;
UndoAction* candidate;
unsigned int stackpointer;
unsigned int depthSetting;
std::deque<UndoAction*> undoStack;
};
#endif
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