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 plugins 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
33** be met: https://www.gnu.org/licenses/gpl-2.0.html and
34** https://www.gnu.org/licenses/gpl-3.0.html.
35**
36** $QT_END_LICENSE$
37**
38****************************************************************************/
39
40#include "qevdevtabletmanager_p.h"
41#include "qevdevtablethandler_p.h"
42
43#include <QtInputSupport/private/qevdevutil_p.h>
44
45#include <QStringList>
46#include <QGuiApplication>
47#include <QLoggingCategory>
48#include <QtDeviceDiscoverySupport/private/qdevicediscovery_p.h>
49#include <private/qguiapplication_p.h>
50#include <private/qinputdevicemanager_p_p.h>
51#include <private/qmemory_p.h>
52
53QT_BEGIN_NAMESPACE
54
55Q_DECLARE_LOGGING_CATEGORY(qLcEvdevTablet)
56
57QEvdevTabletManager::QEvdevTabletManager(const QString &key, const QString &specification, QObject *parent)
58 : QObject(parent)
59{
60 Q_UNUSED(key);
61
62 if (qEnvironmentVariableIsSet(varName: "QT_QPA_EVDEV_DEBUG"))
63 const_cast<QLoggingCategory &>(qLcEvdevTablet()).setEnabled(type: QtDebugMsg, enable: true);
64
65 QString spec = QString::fromLocal8Bit(str: qgetenv(varName: "QT_QPA_EVDEV_TABLET_PARAMETERS"));
66
67 if (spec.isEmpty())
68 spec = specification;
69
70 auto parsed = QEvdevUtil::parseSpecification(specification: spec);
71 m_spec = std::move(parsed.spec);
72
73 for (const QString &device : qAsConst(t&: parsed.devices))
74 addDevice(deviceNode: device);
75
76 // when no devices specified, use device discovery to scan and monitor
77 if (parsed.devices.isEmpty()) {
78 qCDebug(qLcEvdevTablet, "evdevtablet: Using device discovery");
79 if (auto deviceDiscovery = QDeviceDiscovery::create(type: QDeviceDiscovery::Device_Tablet, parent: this)) {
80 const QStringList devices = deviceDiscovery->scanConnectedDevices();
81 for (const QString &device : devices)
82 addDevice(deviceNode: device);
83
84 connect(sender: deviceDiscovery, signal: &QDeviceDiscovery::deviceDetected,
85 receiver: this, slot: &QEvdevTabletManager::addDevice);
86 connect(sender: deviceDiscovery, signal: &QDeviceDiscovery::deviceRemoved,
87 receiver: this, slot: &QEvdevTabletManager::removeDevice);
88 }
89 }
90}
91
92QEvdevTabletManager::~QEvdevTabletManager()
93{
94}
95
96void QEvdevTabletManager::addDevice(const QString &deviceNode)
97{
98 qCDebug(qLcEvdevTablet, "Adding device at %ls", qUtf16Printable(deviceNode));
99 auto handler = qt_make_unique<QEvdevTabletHandlerThread>(args: deviceNode, args&: m_spec);
100 if (handler) {
101 m_activeDevices.add(deviceNode, handler: std::move(handler));
102 updateDeviceCount();
103 } else {
104 qWarning(msg: "evdevtablet: Failed to open tablet device %ls", qUtf16Printable(deviceNode));
105 }
106}
107
108void QEvdevTabletManager::removeDevice(const QString &deviceNode)
109{
110 if (m_activeDevices.remove(deviceNode)) {
111 qCDebug(qLcEvdevTablet, "Removing device at %ls", qUtf16Printable(deviceNode));
112 updateDeviceCount();
113 }
114}
115
116void QEvdevTabletManager::updateDeviceCount()
117{
118 QInputDeviceManagerPrivate::get(mgr: QGuiApplicationPrivate::inputDeviceManager())->setDeviceCount(
119 type: QInputDeviceManager::DeviceTypeTablet, count: m_activeDevices.count());
120}
121
122QT_END_NAMESPACE
123

source code of qtbase/src/platformsupport/input/evdevtablet/qevdevtabletmanager.cpp