/******************************************************************************** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).** All rights reserved.** Contact: Nokia Corporation (qt-info@nokia.com)**** This file is part of the QtGui module of the Qt Toolkit.**** $QT_BEGIN_LICENSE:LGPL$** No Commercial Usage** This file contains pre-release code and may not be distributed.** You may use this file in accordance with the terms and conditions** contained in the Technology Preview License Agreement accompanying** this package.**** GNU Lesser General Public License Usage** Alternatively, this file may be used under the terms of the GNU Lesser** General Public License version 2.1 as published by the Free Software** Foundation and appearing in the file LICENSE.LGPL included in the** packaging of this file. Please review the following information to** ensure the GNU Lesser General Public License version 2.1 requirements** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.**** In addition, as a special exception, Nokia gives you certain additional** rights. These rights are described in the Nokia Qt LGPL Exception** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.**** If you have questions regarding the use of this file, please contact** Nokia at qt-info@nokia.com.****************** $QT_END_LICENSE$******************************************************************************/#ifndef QUNDOGROUP_H#define QUNDOGROUP_H#include <QtCore/qobject.h>#include <QtCore/qstring.h>QT_BEGIN_HEADERQT_BEGIN_NAMESPACEclass QUndoGroupPrivate;class QUndoStack;class QAction;QT_MODULE(Gui)#ifndef QT_NO_UNDOGROUPclass Q_GUI_EXPORT QUndoGroup : public QObject{ Q_OBJECT Q_DECLARE_PRIVATE(QUndoGroup)public: explicit QUndoGroup(QObject *parent = 0); ~QUndoGroup(); void addStack(QUndoStack *stack); void removeStack(QUndoStack *stack); QList<QUndoStack*> stacks() const; QUndoStack *activeStack() const;#ifndef QT_NO_ACTION QAction *createUndoAction(QObject *parent, const QString &prefix = QString()) const; QAction *createRedoAction(QObject *parent, const QString &prefix = QString()) const;#endif // QT_NO_ACTION bool canUndo() const; bool canRedo() const; QString undoText() const; QString redoText() const; bool isClean() const;public Q_SLOTS: void undo(); void redo(); void setActiveStack(QUndoStack *stack);Q_SIGNALS: void activeStackChanged(QUndoStack *stack); void indexChanged(int idx); void cleanChanged(bool clean); void canUndoChanged(bool canUndo); void canRedoChanged(bool canRedo); void undoTextChanged(const QString &undoText); void redoTextChanged(const QString &redoText);private: Q_DISABLE_COPY(QUndoGroup)};#endif // QT_NO_UNDOGROUPQT_END_NAMESPACEQT_END_HEADER#endif // QUNDOGROUP_H