source: trunk/src/gui/util/qundogroup.cpp@ 466

/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** Contact: Qt Software Information ([email protected])
**
** This file is part of the QtGui module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial Usage
** Licensees holding valid Qt Commercial licenses may use this file in
** accordance with the Qt Commercial License Agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Nokia.
**
** 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 1.0, included in the file LGPL_EXCEPTION.txt in this
** package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
** If you are unsure which license is appropriate for your use, please
** contact the sales department at [email protected].
** $QT_END_LICENSE$
**
****************************************************************************/

#include "qundogroup.h"
#include "qundostack.h"
#include "qundostack_p.h"

#ifndef QT_NO_UNDOGROUP

QT_BEGIN_NAMESPACE

class QUndoGroupPrivate : public QObjectPrivate
{
    Q_DECLARE_PUBLIC(QUndoGroup)
public:
    QUndoGroupPrivate() : active(0) {}

    QUndoStack *active;
    QList<QUndoStack*> stack_list;
};

/*!
    \class QUndoGroup
    \brief The QUndoGroup class is a group of QUndoStack objects.
    \since 4.2
    \ingroup misc

    For an overview of the Qt's undo framework, see the
    \link qundo.html overview\endlink.

    An application often has multiple undo stacks, one for each opened document. At the
    same time, an application usually has one undo action and one redo action, which
    triggers undo or redo in the active document.

    QUndoGroup is a group of QUndoStack objects, one of which may be active. It has
    an undo() and redo() slot, which calls QUndoStack::undo() and QUndoStack::redo()
    for the active stack. It also has the functions createUndoAction() and createRedoAction().
    The actions returned by these functions behave in the same way as those returned by
    QUndoStack::createUndoAction() and QUndoStack::createRedoAction() of the active
    stack.

    Stacks are added to a group with addStack() and removed with removeStack(). A stack
    is implicitly added to a group when it is created with the group as its parent
    QObject.

    It is the programmer's responsibility to specify which stack is active by
    calling QUndoStack::setActive(), usually when the associated document window receives focus.
    The active stack may also be set with setActiveStack(), and is returned by activeStack().

    When a stack is added to a group using addStack(), the group does not take ownership
    of the stack. This means the stack has to be deleted separately from the group. When
    a stack is deleted, it is automatically removed from a group. A stack may belong to