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94 lines
3.6 KiB
94 lines
3.6 KiB
/*
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* undo.h - undo/redo facility
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* Program: kalarm
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* Copyright (C) 2005 by David Jarvie <software@astrojar.org.uk>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#ifndef UNDO_H
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#define UNDO_H
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/** @file undo.h - undo/redo facility */
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#include <qvaluelist.h>
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#include <qstringlist.h>
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class KAEvent;
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class UndoItem;
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class Undo : public QObject
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{
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Q_OBJECT
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public:
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enum Type { NONE, UNDO, REDO };
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static Undo* instance();
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static void saveAdd(const KAEvent&);
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static void saveEdit(const KAEvent& oldEvent, const KAEvent& newEvent);
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static void saveDelete(const KAEvent&);
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static void saveDeletes(const QValueList<KAEvent>&);
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static void saveReactivate(const KAEvent&);
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static void saveReactivates(const QValueList<KAEvent>&);
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static bool undo(QWidget* parent, const QString& action)
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{ return undo(mUndoList.begin(), UNDO, parent, action); }
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static bool undo(int id, QWidget* parent, const QString& action)
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{ return undo(findItem(id, UNDO), UNDO, parent, action); }
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static bool redo(QWidget* parent, const QString& action)
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{ return undo(mRedoList.begin(), REDO, parent, action); }
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static bool redo(int id, QWidget* parent, const QString& action)
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{ return undo(findItem(id, REDO), REDO, parent, action); }
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static void clear();
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static bool haveUndo() { return !mUndoList.isEmpty(); }
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static bool haveRedo() { return !mRedoList.isEmpty(); }
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static QString actionText(Type);
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static QString actionText(Type, int id);
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static QString description(Type, int id);
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static QValueList<int> ids(Type);
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static void emitChanged();
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// Types for use by UndoItem class and its descendants
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typedef QValueList<UndoItem*> List;
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signals:
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void changed(const QString& undo, const QString& redo);
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protected:
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// Methods for use by UndoItem class
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static void add(UndoItem*, bool undo);
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static void remove(UndoItem*, bool undo);
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static void replace(UndoItem* old, UndoItem* New);
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private:
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typedef QValueList<UndoItem*>::Iterator Iterator;
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Undo(QObject* parent) : QObject(parent) { }
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static void removeRedos(const QString& eventID);
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static bool undo(Iterator, Type, QWidget* parent, const QString& action);
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static UndoItem* getItem(int id, Type);
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static Iterator findItem(int id, Type);
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void emitChanged(const QString& undo, const QString& redo)
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{ emit changed(undo, redo); }
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static Undo* mInstance; // the one and only Undo instance
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static List mUndoList; // edit history for undo, latest undo first
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static List mRedoList; // edit history for redo, latest redo first
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friend class UndoItem;
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};
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#endif // UNDO_H
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