73 lines
2.7 KiB
C++
73 lines
2.7 KiB
C++
/****************************************************************************
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**
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** Copyright (C) 2016 The Qt Company Ltd.
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** Contact: https://www.qt.io/licensing/
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**
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** This file is part of the Qt Designer of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:GPL-EXCEPT$
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** Commercial License Usage
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** Licensees holding valid commercial Qt licenses may use this file in
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** accordance with the commercial license agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and The Qt Company. For licensing terms
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** and conditions see https://www.qt.io/terms-conditions. For further
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** information use the contact form at https://www.qt.io/contact-us.
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**
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** GNU General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU
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** General Public License version 3 as published by the Free Software
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** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
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** included in the packaging of this file. Please review the following
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** information to ensure the GNU General Public License requirements will
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** be met: https://www.gnu.org/licenses/gpl-3.0.html.
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#ifndef EXTENSION_H
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#define EXTENSION_H
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#include <QtCore/qstring.h>
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#include <QtCore/qobject.h>
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QT_BEGIN_NAMESPACE
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#define Q_TYPEID(IFace) QLatin1String(IFace##_iid)
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class QAbstractExtensionFactory
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{
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public:
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virtual ~QAbstractExtensionFactory() {}
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virtual QObject *extension(QObject *object, const QString &iid) const = 0;
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};
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Q_DECLARE_INTERFACE(QAbstractExtensionFactory, "org.qt-project.Qt.QAbstractExtensionFactory")
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class QAbstractExtensionManager
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{
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public:
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virtual ~QAbstractExtensionManager() {}
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virtual void registerExtensions(QAbstractExtensionFactory *factory, const QString &iid) = 0;
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virtual void unregisterExtensions(QAbstractExtensionFactory *factory, const QString &iid) = 0;
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virtual QObject *extension(QObject *object, const QString &iid) const = 0;
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};
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Q_DECLARE_INTERFACE(QAbstractExtensionManager, "org.qt-project.Qt.QAbstractExtensionManager")
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template <class T>
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inline T qt_extension(QAbstractExtensionManager *, QObject *)
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{ return nullptr; }
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#define Q_DECLARE_EXTENSION_INTERFACE(IFace, IId) \
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const char * const IFace##_iid = IId; \
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Q_DECLARE_INTERFACE(IFace, IId) \
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template <> inline IFace *qt_extension<IFace *>(QAbstractExtensionManager *manager, QObject *object) \
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{ QObject *extension = manager->extension(object, Q_TYPEID(IFace)); return extension ? static_cast<IFace *>(extension->qt_metacast(IFace##_iid)) : static_cast<IFace *>(nullptr); }
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QT_END_NAMESPACE
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#endif // EXTENSION_H
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