extension.h

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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
 
#ifndef EXTENSION_H
#define EXTENSION_H
 
#include <QtDesigner/extension_global.h>
 
#include <QtCore/qstring.h>
#include <QtCore/qobject.h>
 
QT_BEGIN_NAMESPACE
 
#define Q_TYPEID(IFace) QLatin1StringView(IFace##_iid)
 
class QDESIGNER_EXTENSION_EXPORT QAbstractExtensionFactory
{
public:
    virtual ~QAbstractExtensionFactory();
 
    virtual QObject *extension(QObject *object, const QString &iid) const = 0;
};
Q_DECLARE_INTERFACE(QAbstractExtensionFactory, "org.qt-project.Qt.QAbstractExtensionFactory")
 
class QDESIGNER_EXTENSION_EXPORT 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