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/****************************************************************************
**
** Copyright (C) 2021 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the Qt Designer of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:COMM$
**
** 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
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** $QT_END_LICENSE$
**
**
**
**
**
**
**
**
****************************************************************************/
#ifndef EXTENSION_H
#define EXTENSION_H
#include <QtCore/qstring.h>
#include <QtCore/qobject.h>
QT_BEGIN_NAMESPACE
#define Q_TYPEID(IFace) QLatin1String(IFace##_iid)
class QAbstractExtensionFactory
{
public:
virtual ~QAbstractExtensionFactory() {}
virtual QObject *extension(QObject *object, const QString &iid) const = 0;
};
Q_DECLARE_INTERFACE(QAbstractExtensionFactory, "org.qt-project.Qt.QAbstractExtensionFactory")
class QAbstractExtensionManager
{
public:
virtual ~QAbstractExtensionManager() {}
virtual void registerExtensions(QAbstractExtensionFactory *factory, const QString &iid) = 0;
virtual void unregisterExtensions(QAbstractExtensionFactory *factory, const QString &iid) = 0;
virtual QObject *extension(QObject *object, const QString &iid) const = 0;
};
Q_DECLARE_INTERFACE(QAbstractExtensionManager, "org.qt-project.Qt.QAbstractExtensionManager")
template <class T>
inline T qt_extension(QAbstractExtensionManager *, QObject *)
{ return nullptr; }
#define Q_DECLARE_EXTENSION_INTERFACE(IFace, IId) \
const char * const IFace##_iid = IId; \
Q_DECLARE_INTERFACE(IFace, IId) \
template <> inline IFace *qt_extension<IFace *>(QAbstractExtensionManager *manager, QObject *object) \
{ QObject *extension = manager->extension(object, Q_TYPEID(IFace)); return extension ? static_cast<IFace *>(extension->qt_metacast(IFace##_iid)) : static_cast<IFace *>(nullptr); }
QT_END_NAMESPACE
#endif // EXTENSION_H
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