1/****************************************************************************
2**
3** Copyright (C) 2016 The Qt Company Ltd.
4** Contact: https://www.qt.io/licensing/
5**
6** This file is part of the Qt Designer of the Qt Toolkit.
7**
8** $QT_BEGIN_LICENSE:GPL-EXCEPT$
9** Commercial License Usage
10** Licensees holding valid commercial Qt licenses may use this file in
11** accordance with the commercial license agreement provided with the
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17** GNU General Public License Usage
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27****************************************************************************/
28
29#ifndef EXTENSION_H
30#define EXTENSION_H
31
32#include <QtCore/qstring.h>
33#include <QtCore/qobject.h>
34
35QT_BEGIN_NAMESPACE
36
37#define Q_TYPEID(IFace) QLatin1String(IFace##_iid)
38
39class QAbstractExtensionFactory
40{
41public:
42 virtual ~QAbstractExtensionFactory() {}
43
44 virtual QObject *extension(QObject *object, const QString &iid) const = 0;
45};
46Q_DECLARE_INTERFACE(QAbstractExtensionFactory, "org.qt-project.Qt.QAbstractExtensionFactory")
47
48class QAbstractExtensionManager
49{
50public:
51 virtual ~QAbstractExtensionManager() {}
52
53 virtual void registerExtensions(QAbstractExtensionFactory *factory, const QString &iid) = 0;
54 virtual void unregisterExtensions(QAbstractExtensionFactory *factory, const QString &iid) = 0;
55
56 virtual QObject *extension(QObject *object, const QString &iid) const = 0;
57};
58Q_DECLARE_INTERFACE(QAbstractExtensionManager, "org.qt-project.Qt.QAbstractExtensionManager")
59
60template <class T>
61inline T qt_extension(QAbstractExtensionManager *, QObject *)
62{ return nullptr; }
63
64#define Q_DECLARE_EXTENSION_INTERFACE(IFace, IId) \
65const char * const IFace##_iid = IId; \
66Q_DECLARE_INTERFACE(IFace, IId) \
67template <> inline IFace *qt_extension<IFace *>(QAbstractExtensionManager *manager, QObject *object) \
68{ QObject *extension = manager->extension(object, Q_TYPEID(IFace)); return extension ? static_cast<IFace *>(extension->qt_metacast(IFace##_iid)) : static_cast<IFace *>(nullptr); }
69
70QT_END_NAMESPACE
71
72#endif // EXTENSION_H
73

source code of qttools/src/designer/src/lib/extension/extension.h