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1/****************************************************************************
2**
3** Copyright (C) 2017 Erik Larsson.
4** Contact: https://www.qt.io/licensing/
5**
6** This file is part of the QtWaylandCompositor module of the Qt Toolkit.
7**
8** $QT_BEGIN_LICENSE:LGPL$
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
12** Software or, alternatively, in accordance with the terms contained in
13** a written agreement between you and The Qt Company. For licensing terms
14** and conditions see https://www.qt.io/terms-conditions. For further
15** information use the contact form at https://www.qt.io/contact-us.
16**
17** GNU Lesser General Public License Usage
18** Alternatively, this file may be used under the terms of the GNU Lesser
19** General Public License version 3 as published by the Free Software
20** Foundation and appearing in the file LICENSE.LGPL3 included in the
21** packaging of this file. Please review the following information to
22** ensure the GNU Lesser General Public License version 3 requirements
23** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
24**
25** GNU General Public License Usage
26** Alternatively, this file may be used under the terms of the GNU
27** General Public License version 2.0 or (at your option) the GNU General
28** Public license version 3 or any later version approved by the KDE Free
29** Qt Foundation. The licenses are as published by the Free Software
30** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
31** included in the packaging of this file. Please review the following
32** information to ensure the GNU General Public License requirements will
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38****************************************************************************/
39
40#ifndef QWAYLANDCLIENTEXTENSION_H
41#define QWAYLANDCLIENTEXTENSION_H
42
43#include <QObject>
44#include <QtWaylandClient/qtwaylandclientglobal.h>
45
46struct wl_interface;
47struct wl_registry;
48
49QT_BEGIN_NAMESPACE
50
51namespace QtWaylandClient {
52class QWaylandIntegration;
53}
54
55class QWaylandClientExtensionPrivate;
56class QWaylandClientExtensionTemplatePrivate;
57
58class Q_WAYLAND_CLIENT_EXPORT QWaylandClientExtension : public QObject
59{
60 Q_OBJECT
61 Q_DECLARE_PRIVATE(QWaylandClientExtension)
62 Q_PROPERTY(int protocolVersion READ version NOTIFY versionChanged)
63 Q_PROPERTY(bool active READ isActive NOTIFY activeChanged)
64public:
65 QWaylandClientExtension(const int version);
66
67 QtWaylandClient::QWaylandIntegration *integration() const;
68 int version() const;
69 bool isActive() const;
70
71 virtual const struct wl_interface *extensionInterface() const = 0;
72 virtual void bind(struct ::wl_registry *registry, int id, int version) = 0;
73protected:
74 void setVersion(const int version);
75Q_SIGNALS:
76 void versionChanged();
77 void activeChanged();
78
79private Q_SLOTS:
80 void addRegistryListener();
81};
82
83template <typename T>
84class Q_WAYLAND_CLIENT_EXPORT QWaylandClientExtensionTemplate : public QWaylandClientExtension
85{
86 Q_DECLARE_PRIVATE(QWaylandClientExtensionTemplate)
87public:
88 QWaylandClientExtensionTemplate(const int ver) :
89 QWaylandClientExtension(ver)
90 {
91 }
92
93 const struct wl_interface *extensionInterface() const override
94 {
95 return T::interface();
96 }
97
98 void bind(struct ::wl_registry *registry, int id, int ver) override
99 {
100 T* instance = static_cast<T *>(this);
101 // Make sure lowest version is used of the supplied version from the
102 // developer and the version specified in the protocol and also the
103 // compositor version.
104 if (this->version() > T::interface()->version) {
105 qWarning(msg: "Supplied protocol version to QWaylandClientExtensionTemplate is higher than the version of the protocol, using protocol version instead.");
106 }
107 int minVersion = qMin(ver, qMin(T::interface()->version, this->version()));
108 setVersion(minVersion);
109 instance->init(registry, id, minVersion);
110 }
111};
112
113QT_END_NAMESPACE
114
115#endif // QWAYLANDCLIENTEXTENSION_H
116

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source code of qtwayland/src/client/global/qwaylandclientextension.h