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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 | ** $QT_BEGIN_LICENSE:GPL-EXCEPT$ |
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17 | ** GNU General Public License Usage |
18 | ** Alternatively, this file may be used under the terms of the GNU |
19 | ** General Public License version 3 as published by the Free Software |
20 | ** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT |
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25 | ** $QT_END_LICENSE$ |
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27 | ****************************************************************************/ |
28 | |
29 | // |
30 | // W A R N I N G |
31 | // ------------- |
32 | // |
33 | // This file is not part of the Qt API. It exists for the convenience |
34 | // of Qt Designer. This header |
35 | // file may change from version to version without notice, or even be removed. |
36 | // |
37 | // We mean it. |
38 | // |
39 | |
40 | #ifndef SHARED_EXTENSIONFACTORY_H |
41 | #define SHARED_EXTENSIONFACTORY_H |
42 | |
43 | #include <QtDesigner/default_extensionfactory.h> |
44 | #include <QtDesigner/qextensionmanager.h> |
45 | |
46 | QT_BEGIN_NAMESPACE |
47 | |
48 | namespace qdesigner_internal { |
49 | |
50 | // Extension factory for registering an extension for an object type. |
51 | template <class ExtensionInterface, class Object, class Extension> |
52 | class ExtensionFactory: public QExtensionFactory |
53 | { |
54 | public: |
55 | explicit ExtensionFactory(const QString &iid, QExtensionManager *parent = nullptr); |
56 | |
57 | // Convenience for registering the extension. Do not use for derived classes. |
58 | static void registerExtension(QExtensionManager *mgr, const QString &iid); |
59 | |
60 | protected: |
61 | QObject *createExtension(QObject *qObject, const QString &iid, QObject *parent) const override; |
62 | |
63 | private: |
64 | // Can be overwritten to perform checks on the object. |
65 | // Default does a qobject_cast to the desired class. |
66 | virtual Object *checkObject(QObject *qObject) const; |
67 | |
68 | const QString m_iid; |
69 | }; |
70 | |
71 | template <class ExtensionInterface, class Object, class Extension> |
72 | ExtensionFactory<ExtensionInterface, Object, Extension>::ExtensionFactory(const QString &iid, QExtensionManager *parent) : |
73 | QExtensionFactory(parent), |
74 | m_iid(iid) |
75 | { |
76 | } |
77 | |
78 | template <class ExtensionInterface, class Object, class Extension> |
79 | Object *ExtensionFactory<ExtensionInterface, Object, Extension>::checkObject(QObject *qObject) const |
80 | { |
81 | return qobject_cast<Object*>(qObject); |
82 | } |
83 | |
84 | template <class ExtensionInterface, class Object, class Extension> |
85 | QObject *ExtensionFactory<ExtensionInterface, Object, Extension>::createExtension(QObject *qObject, const QString &iid, QObject *parent) const |
86 | { |
87 | if (iid != m_iid) |
88 | return nullptr; |
89 | |
90 | Object *object = checkObject(qObject); |
91 | if (!object) |
92 | return nullptr; |
93 | |
94 | return new Extension(object, parent); |
95 | } |
96 | |
97 | template <class ExtensionInterface, class Object, class Extension> |
98 | void ExtensionFactory<ExtensionInterface, Object, Extension>::registerExtension(QExtensionManager *mgr, const QString &iid) |
99 | { |
100 | ExtensionFactory *factory = new ExtensionFactory(iid, mgr); |
101 | mgr->registerExtensions(factory, iid); |
102 | } |
103 | } // namespace qdesigner_internal |
104 | |
105 | QT_END_NAMESPACE |
106 | |
107 | #endif // SHARED_EXTENSIONFACTORY_H |
108 | |