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39
40#include "qevdevtouchmanager_p.h"
41#include "qevdevtouchhandler_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(qLcEvdevTouch)
56
57QEvdevTouchManager::QEvdevTouchManager(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 &>(qLcEvdevTouch()).setEnabled(type: QtDebugMsg, enable: true);
64
65 QString spec = QString::fromLocal8Bit(str: qgetenv(varName: "QT_QPA_EVDEV_TOUCHSCREEN_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(qLcEvdevTouch, "evdevtouch: Using device discovery");
79 if (auto deviceDiscovery = QDeviceDiscovery::create(type: QDeviceDiscovery::Device_Touchpad | QDeviceDiscovery::Device_Touchscreen, 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: &QEvdevTouchManager::addDevice);
86 connect(sender: deviceDiscovery, signal: &QDeviceDiscovery::deviceRemoved,
87 receiver: this, slot: &QEvdevTouchManager::removeDevice);
88 }
89 }
90}
91
92QEvdevTouchManager::~QEvdevTouchManager()
93{
94}
95
96void QEvdevTouchManager::addDevice(const QString &deviceNode)
97{
98 qCDebug(qLcEvdevTouch, "evdevtouch: Adding device at %ls", qUtf16Printable(deviceNode));
99 auto handler = qt_make_unique<QEvdevTouchScreenHandlerThread>(args: deviceNode, args&: m_spec);
100 if (handler) {
101 connect(sender: handler.get(), signal: &QEvdevTouchScreenHandlerThread::touchDeviceRegistered, receiver: this, slot: &QEvdevTouchManager::updateInputDeviceCount);
102 m_activeDevices.add(deviceNode, handler: std::move(handler));
103 } else {
104 qWarning(msg: "evdevtouch: Failed to open touch device %ls", qUtf16Printable(deviceNode));
105 }
106}
107
108void QEvdevTouchManager::removeDevice(const QString &deviceNode)
109{
110 if (m_activeDevices.remove(deviceNode)) {
111 qCDebug(qLcEvdevTouch, "evdevtouch: Removing device at %ls", qUtf16Printable(deviceNode));
112 updateInputDeviceCount();
113 }
114}
115
116void QEvdevTouchManager::updateInputDeviceCount()
117{
118 int registeredTouchDevices = 0;
119 for (const auto &device : m_activeDevices) {
120 if (device.handler->isTouchDeviceRegistered())
121 ++registeredTouchDevices;
122 }
123
124 qCDebug(qLcEvdevTouch, "evdevtouch: Updating QInputDeviceManager device count: %d touch devices, %d pending handler(s)",
125 registeredTouchDevices, m_activeDevices.count() - registeredTouchDevices);
126
127 QInputDeviceManagerPrivate::get(mgr: QGuiApplicationPrivate::inputDeviceManager())->setDeviceCount(
128 type: QInputDeviceManager::DeviceTypeTouch, count: registeredTouchDevices);
129}
130
131QT_END_NAMESPACE
132

source code of qtbase/src/platformsupport/input/evdevtouch/qevdevtouchmanager.cpp