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/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the Qt Designer of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:GPL-EXCEPT$
** 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.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3 as published by the Free Software
** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
//
// 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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