/****************************************************************************
**
** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the QtWidgets module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL21$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Digia. For licensing terms and
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** use the contact form at http://qt.digia.com/contact-us.
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** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
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** LICENSE.LGPLv3 included in the packaging of this file. Please review the
** following information to ensure the GNU Lesser General Public License
** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Digia gives you certain additional
** rights. These rights are described in the Digia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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** $QT_END_LICENSE$
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****************************************************************************/

#ifndef QTREEWIDGETITEMITERATOR_H
#define QTREEWIDGETITEMITERATOR_H

#include <QtCore/qglobal.h>
#include <QtCore/qscopedpointer.h>

QT_BEGIN_NAMESPACE


#ifndef QT_NO_TREEWIDGET

class QTreeWidget;
class QTreeWidgetItem;
class QTreeModel;

class QTreeWidgetItemIteratorPrivate;
class Q_WIDGETS_EXPORT QTreeWidgetItemIterator
{
    friend class QTreeModel;

public:
    enum IteratorFlag {
        All           = 0x00000000,
        Hidden        = 0x00000001,
        NotHidden     = 0x00000002,
        Selected      = 0x00000004,
        Unselected    = 0x00000008,
        Selectable    = 0x00000010,
        NotSelectable = 0x00000020,
        DragEnabled   = 0x00000040,
        DragDisabled  = 0x00000080,
        DropEnabled   = 0x00000100,
        DropDisabled  = 0x00000200,
        HasChildren   = 0x00000400,
        NoChildren    = 0x00000800,
        Checked       = 0x00001000,
        NotChecked    = 0x00002000,
        Enabled       = 0x00004000,
        Disabled      = 0x00008000,
        Editable      = 0x00010000,
        NotEditable   = 0x00020000,
        UserFlag      = 0x01000000 // The first flag that can be used by the user.
    };
    Q_DECLARE_FLAGS(IteratorFlags, IteratorFlag)

    QTreeWidgetItemIterator(const QTreeWidgetItemIterator &it);
    explicit QTreeWidgetItemIterator(QTreeWidget *widget, IteratorFlags flags = All);
    explicit QTreeWidgetItemIterator(QTreeWidgetItem *item, IteratorFlags flags = All);
    ~QTreeWidgetItemIterator();

    QTreeWidgetItemIterator &operator=(const QTreeWidgetItemIterator &it);

    QTreeWidgetItemIterator &operator++();
    inline const QTreeWidgetItemIterator operator++(int);
    inline QTreeWidgetItemIterator &operator+=(int n);

    QTreeWidgetItemIterator &operator--();
    inline const QTreeWidgetItemIterator operator--(int);
    inline QTreeWidgetItemIterator &operator-=(int n);

    inline QTreeWidgetItem *operator*() const;

private:
    bool matchesFlags(const QTreeWidgetItem *item) const;
    QScopedPointer<QTreeWidgetItemIteratorPrivate> d_ptr;
    QTreeWidgetItem *current;
    IteratorFlags flags;
    Q_DECLARE_PRIVATE(QTreeWidgetItemIterator)
};

inline const QTreeWidgetItemIterator QTreeWidgetItemIterator::operator++(int)
{
    QTreeWidgetItemIterator it = *this;
    ++(*this);
    return it;
}

inline const QTreeWidgetItemIterator QTreeWidgetItemIterator::operator--(int)
{
    QTreeWidgetItemIterator it = *this;
    --(*this);
    return it;
}

inline QTreeWidgetItemIterator &QTreeWidgetItemIterator::operator+=(int n)
{
    if (n < 0)
        return (*this) -= (-n);
    while (current && n--)
        ++(*this);
    return *this;
}

inline QTreeWidgetItemIterator &QTreeWidgetItemIterator::operator-=(int n)
{
    if (n < 0)
        return (*this) += (-n);
    while (current && n--)
        --(*this);
    return *this;
}

inline QTreeWidgetItem *QTreeWidgetItemIterator::operator*() const
{
    return current;
}

Q_DECLARE_OPERATORS_FOR_FLAGS(QTreeWidgetItemIterator::IteratorFlags)


QT_END_NAMESPACE
#endif // QT_NO_TREEWIDGET
#endif // QTREEWIDGETITEMITERATOR_H
