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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
//
// W A R N I N G
// -------------
//
// This file is not part of the Qt API. It exists for the convenience
// of Qt Designer. This header
// file may change from version to version without notice, or even be removed.
//
// We mean it.
//
#ifndef SHARED_EXTENSIONFACTORY_H
#define SHARED_EXTENSIONFACTORY_H
#include <QtDesigner/default_extensionfactory.h>
#include <QtDesigner/qextensionmanager.h>
QT_BEGIN_NAMESPACE
namespace qdesigner_internal {
// Extension factory for registering an extension for an object type.
template <class ExtensionInterface, class Object, class Extension>
class ExtensionFactory: public QExtensionFactory
{
public:
explicit ExtensionFactory(const QString &iid, QExtensionManager *parent = nullptr);
// Convenience for registering the extension. Do not use for derived classes.
static void registerExtension(QExtensionManager *mgr, const QString &iid);
protected:
QObject *createExtension(QObject *qObject, const QString &iid, QObject *parent) const override;
private:
// Can be overwritten to perform checks on the object.
// Default does a qobject_cast to the desired class.
virtual Object *checkObject(QObject *qObject) const;
const QString m_iid;
};
template <class ExtensionInterface, class Object, class Extension>
ExtensionFactory<ExtensionInterface, Object, Extension>::ExtensionFactory(const QString &iid, QExtensionManager *parent) :
QExtensionFactory(parent),
m_iid(iid)
{
}
template <class ExtensionInterface, class Object, class Extension>
Object *ExtensionFactory<ExtensionInterface, Object, Extension>::checkObject(QObject *qObject) const
{
return qobject_cast<Object*>(qObject);
}
template <class ExtensionInterface, class Object, class Extension>
QObject *ExtensionFactory<ExtensionInterface, Object, Extension>::createExtension(QObject *qObject, const QString &iid, QObject *parent) const
{
if (iid != m_iid)
return nullptr;
Object *object = checkObject(qObject);
if (!object)
return nullptr;
return new Extension(object, parent);
}
template <class ExtensionInterface, class Object, class Extension>
void ExtensionFactory<ExtensionInterface, Object, Extension>::registerExtension(QExtensionManager *mgr, const QString &iid)
{
ExtensionFactory *factory = new ExtensionFactory(iid, mgr);
mgr->registerExtensions(factory, iid);
}
} // namespace qdesigner_internal
QT_END_NAMESPACE
#endif // SHARED_EXTENSIONFACTORY_H
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