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/*
* undo.h - undo/redo facility
* Program: kalarm
* Copyright (C) 2005 by David Jarvie <software@astrojar.org.uk>
*
* 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
/** @file undo.h - undo/redo facility */
#include <qvaluelist.h>
#include <qstringlist.h>
class KAEvent;
class UndoItem;
class Undo : public QObject
{
Q_OBJECT
public:
enum Type { NONE, UNDO, REDO };
static Undo* instance();
static void saveAdd(const KAEvent&);
static void saveEdit(const KAEvent& oldEvent, const KAEvent& newEvent);
static void saveDelete(const KAEvent&);
static void saveDeletes(const QValueList<KAEvent>&);
static void saveReactivate(const KAEvent&);
static void saveReactivates(const QValueList<KAEvent>&);
static bool undo(QWidget* parent, const QString& action)
{ return undo(mUndoList.begin(), UNDO, parent, action); }
static bool undo(int id, QWidget* parent, const QString& action)
{ return undo(findItem(id, UNDO), UNDO, parent, action); }
static bool redo(QWidget* parent, const QString& action)
{ return undo(mRedoList.begin(), REDO, parent, action); }
static bool redo(int id, QWidget* parent, const QString& action)
{ return undo(findItem(id, REDO), REDO, parent, action); }
static void clear();
static bool haveUndo() { return !mUndoList.isEmpty(); }
static bool haveRedo() { return !mRedoList.isEmpty(); }
static QString actionText(Type);
static QString actionText(Type, int id);
static QString description(Type, int id);
static QValueList<int> ids(Type);
static void emitChanged();
// Types for use by UndoItem class and its descendants
typedef QValueList<UndoItem*> List;
signals:
void changed(const QString& undo, const QString& redo);
protected:
// Methods for use by UndoItem class
static void add(UndoItem*, bool undo);
static void remove(UndoItem*, bool undo);
static void replace(UndoItem* old, UndoItem* New);
private:
typedef QValueList<UndoItem*>::Iterator Iterator;
Undo(QObject* parent) : QObject(parent) { }
static void removeRedos(const QString& eventID);
static bool undo(Iterator, Type, QWidget* parent, const QString& action);
static UndoItem* getItem(int id, Type);
static Iterator findItem(int id, Type);
void emitChanged(const QString& undo, const QString& redo)
{ emit changed(undo, redo); }
static Undo* mInstance; // the one and only Undo instance
static List mUndoList; // edit history for undo, latest undo first
static List mRedoList; // edit history for redo, latest redo first
friend class UndoItem;
};
#endif // UNDO_H
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