/****************************************************************************+
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**+
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** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).+
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** All rights reserved.+
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** Contact: Nokia Corporation (qt-info@nokia.com)+
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**+
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** This file is part of the QtGui module of the Qt Toolkit.+
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**+
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** $QT_BEGIN_LICENSE:LGPL$+
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** No Commercial Usage+
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** This file contains pre-release code and may not be distributed.+
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** You may use this file in accordance with the terms and conditions+
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** contained in the Technology Preview License Agreement accompanying+
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** this package.+
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**+
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** GNU Lesser General Public License Usage+
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** Alternatively, this file may be used under the terms of the GNU Lesser+
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** General Public License version 2.1 as published by the Free Software+
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** Foundation and appearing in the file LICENSE.LGPL included in the+
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** packaging of this file.  Please review the following information to+
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** ensure the GNU Lesser General Public License version 2.1 requirements+
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** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.+
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**+
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** In addition, as a special exception, Nokia gives you certain additional+
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** rights.  These rights are described in the Nokia Qt LGPL Exception+
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.+
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**+
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** If you have questions regarding the use of this file, please contact+
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** Nokia at qt-info@nokia.com.+
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**+
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**+
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**+
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**+
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**+
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**+
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**+
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**+
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** $QT_END_LICENSE$+
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**+
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****************************************************************************/+
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+
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#ifndef QUNDOSTACK_H+
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#define QUNDOSTACK_H+
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+
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#include <QtCore/qobject.h>+
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#include <QtCore/qstring.h>+
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+
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QT_BEGIN_HEADER+
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+
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QT_BEGIN_NAMESPACE+
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+
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QT_MODULE(Gui)+
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+
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class QAction;+
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class QUndoCommandPrivate;+
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class QUndoStackPrivate;+
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+
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#ifndef QT_NO_UNDOCOMMAND+
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+
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class Q_GUI_EXPORT QUndoCommand+
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{+
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    QUndoCommandPrivate *d;+
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+
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public:+
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    explicit QUndoCommand(QUndoCommand *parent = 0);+
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    explicit QUndoCommand(const QString &text, QUndoCommand *parent = 0);+
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    virtual ~QUndoCommand();+
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+
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    virtual void undo();+
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    virtual void redo();+
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+
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    QString text() const;+
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    void setText(const QString &text);+
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+
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    virtual int id() const;+
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    virtual bool mergeWith(const QUndoCommand *other);+
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+
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    int childCount() const;+
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    const QUndoCommand *child(int index) const;+
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+
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private:+
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    Q_DISABLE_COPY(QUndoCommand)+
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    friend class QUndoStack;+
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};+
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+
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#endif // QT_NO_UNDOCOMMAND+
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+
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#ifndef QT_NO_UNDOSTACK+
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+
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class Q_GUI_EXPORT QUndoStack : public QObject+
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{+
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    Q_OBJECT+
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    Q_DECLARE_PRIVATE(QUndoStack)+
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    Q_PROPERTY(bool active READ isActive WRITE setActive)+
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    Q_PROPERTY(int undoLimit READ undoLimit WRITE setUndoLimit)+
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+
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public:+
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    explicit QUndoStack(QObject *parent = 0);+
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    ~QUndoStack();+
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    void clear();+
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+
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    void push(QUndoCommand *cmd);+
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+
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    bool canUndo() const;+
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    bool canRedo() const;+
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    QString undoText() const;+
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    QString redoText() const;+
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+
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    int count() const;+
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    int index() const;+
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    QString text(int idx) const;+
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+
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#ifndef QT_NO_ACTION+
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    QAction *createUndoAction(QObject *parent,+
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                                const QString &prefix = QString()) const;+
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    QAction *createRedoAction(QObject *parent,+
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                                const QString &prefix = QString()) const;+
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#endif // QT_NO_ACTION+
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+
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    bool isActive() const;+
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    bool isClean() const;+
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    int cleanIndex() const;+
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+
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    void beginMacro(const QString &text);+
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    void endMacro();+
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+
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    void setUndoLimit(int limit);+
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    int undoLimit() const;+
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+
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    const QUndoCommand *command(int index) const;+
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+
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public Q_SLOTS:+
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    void setClean();+
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    void setIndex(int idx);+
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    void undo();+
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    void redo();+
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    void setActive(bool active = true);+
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+
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Q_SIGNALS:+
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    void indexChanged(int idx);+
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    void cleanChanged(bool clean);+
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    void canUndoChanged(bool canUndo);+
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    void canRedoChanged(bool canRedo);+
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    void undoTextChanged(const QString &undoText);+
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    void redoTextChanged(const QString &redoText);+
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+
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private:+
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    Q_DISABLE_COPY(QUndoStack)+
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    friend class QUndoGroup;+
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};+
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+
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#endif // QT_NO_UNDOSTACK+
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+
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QT_END_NAMESPACE+
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+
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QT_END_HEADER+
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+
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#endif // QUNDOSTACK_H+
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