/usr/src/RPM/BUILD/qtspell-0.8.2/src/UndoRedoStack.hpp

/* QtSpell - Spell checking for Qt text widgets.
 * Copyright (c) 2014 Sandro Mani
 *
 *    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 QTSPELL_UNDOREDOSTACK_HPP
#define QTSPELL_UNDOREDOSTACK_HPP

#include <QObject>
#include <QStack>


namespace QtSpell {

class TextEditProxy;

class UndoRedoStack : public QObject
{
        Q_OBJECT
public:
        UndoRedoStack(TextEditProxy* textEdit);
        void handleContentsChange(int pos, int removed, int added);
        void clear();

public slots:
        void undo();
        void redo();

signals:
        void undoAvailable(bool);
        void redoAvailable(bool);

private:
        struct Action;
        struct UndoableInsert;
        struct UndoableDelete;

        bool m_actionInProgress;
        TextEditProxy* m_textEdit;
        QStack<Action*> m_undoStack;
        QStack<Action*> m_redoStack;

        bool insertMergeable(const UndoableInsert* prev, const UndoableInsert* cur) const;
        bool deleteMergeable(const UndoableDelete* prev, const UndoableDelete* cur) const;
};

} // QtSpell

#endif // QTSPELL_UNDOREDOSTACK_HPP