/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
**
** This file is part of the Qt Quick Controls 2 module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL3$
** 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 The Qt Company. For licensing terms
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** information use the contact form at http://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPLv3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or later 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 2.0 requirements will be
** met: http://www.gnu.org/licenses/gpl-2.0.html.
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** $QT_END_LICENSE$
**
****************************************************************************/

#ifndef QQUICKSTYLEATTACHED_P_H
#define QQUICKSTYLEATTACHED_P_H

//
//  W A R N I N G
//  -------------
//
// This file is not part of the Qt API.  It exists purely as an
// implementation detail.  This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//

#include <QtQml/qqml.h>
#include <QtCore/qlist.h>
#include <QtCore/qobject.h>
#include <QtCore/qpointer.h>
#include <QtCore/qsharedpointer.h>
#include <QtQuick/private/qquickitemchangelistener_p.h>
#include <QtQuickControls2/private/qtquickcontrols2global_p.h>

QT_BEGIN_NAMESPACE

class QSettings;
class QQuickWindow;

class Q_QUICKCONTROLS2_PRIVATE_EXPORT QQuickStyleAttached : public QObject, public QQuickItemChangeListener
{
    Q_OBJECT

public:
    explicit QQuickStyleAttached(QObject *parent = nullptr);
    ~QQuickStyleAttached();

    static QSharedPointer<QSettings> settings(const QString &group = QString());

protected:
    void init();

    QList<QQuickStyleAttached *> childStyles() const;

    QQuickStyleAttached *parentStyle() const;
    void setParentStyle(QQuickStyleAttached *style);

    virtual void parentStyleChange(QQuickStyleAttached *newParent, QQuickStyleAttached *oldParent);

    void itemWindowChanged(QQuickWindow *window);
    void itemParentChanged(QQuickItem *item, QQuickItem *parent) override;

private:
    QList<QQuickStyleAttached *> m_childStyles;
    QPointer<QQuickStyleAttached> m_parentStyle;
};

QT_END_NAMESPACE

#endif // QQUICKSTYLEATTACHED_P_H