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Digitizer plugin

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## Summary

Add plugin that allows users to use their devices as pressure-sensitive drawing tablets.

* Schemas MR: https://invent.kde.org/network/kdeconnect-meta/-/merge_requests/16
* Android MR: https://invent.kde.org/network/kdeconnect-android/-/merge_requests/555

The input device is created using Linux's `uinput` via `libevdev`.
This commit is contained in:
Martin Sh
2025-11-25 22:27:06 +02:00
committed by Albert Vaca Cintora
parent b06c4fa268
commit 8fd8e184b5
15 changed files with 904 additions and 1 deletions
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2
CMakeLists.txt
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@@ -108,7 +108,7 @@ if (Qt6Gui_VERSION VERSION_GREATER_EQUAL "6.10.0")
endif()
find_package(KF6 ${KF_MIN_VERSION} REQUIRED COMPONENTS I18n DBusAddons IconThemes Notifications
KIO ColorScheme Service Solid Kirigami People WindowSystem GuiAddons Crash ItemModels)
KIO ColorScheme Service Solid Kirigami People WindowSystem GuiAddons Crash ItemModels WidgetsAddons)
if (WIN32)
get_filename_component(WINDOWS_KITS_DIR

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LICENSES/CC-BY-SA-4.0.txt Normal file
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@@ -0,0 +1,428 @@
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REUSE.toml Normal file
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# SPDX-FileCopyrightText: 2025 Martin Sh <hemisputnik@proton.me>
# SPDX-License-Identifier: CC0
version = 1
[[annotations]]
path = "plugins/digitizer/kdeconnect_digitizer.json"
SPDX-License-Identifier = "GPL-2.0-only OR GPL-3.0-only OR LicenseRef-KDE-Accepted-GPL"

1
plugins/CMakeLists.txt
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@@ -7,6 +7,7 @@ add_subdirectory(remotecontrol)
add_subdirectory(remotesystemvolume)
add_subdirectory(clipboard)
add_subdirectory(runcommand)
add_subdirectory(digitizer)
if(NOT WIN32)

5
plugins/digitizer/40-kdeconnect-uinput.rules Normal file
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@@ -0,0 +1,5 @@
# SPDX-FileCopyrightText: 2025 Martin Sh <hemisputnik@proton.me>
# SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only OR LicenseRef-KDE-Accepted-GPL
# Allow KDE Connect to create virtual input devices
KERNEL=="uinput", SUBSYSTEM=="misc", TAG+="uaccess", OPTIONS+="static_node=uinput"

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plugins/digitizer/CMakeLists.txt Normal file
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# SPDX-FileCopyrightText: 2025 Martin Sh <hemisputnik@proton.me>
# SPDX-License-Identifier: BSD-2-Clause
if(UNIX AND NOT APPLE)
pkg_check_modules(Evdev IMPORTED_TARGET libevdev)
if (Evdev_FOUND)
set(HAS_DEPS 1)
endif()
endif()
if(HAS_DEPS)
kdeconnect_add_plugin(kdeconnect_digitizer SOURCES digitizerplugin.cpp abstractdigitizerimpl.cpp)
target_link_libraries(kdeconnect_digitizer
kdeconnectcore
KF6::I18n
KF6::WidgetsAddons
)
if(UNIX AND NOT APPLE)
target_link_libraries(kdeconnect_digitizer PkgConfig::Evdev)
target_sources(kdeconnect_digitizer PUBLIC linuxdigitizerimpl.cpp)
endif()
install(FILES 40-kdeconnect-uinput.rules DESTINATION ${KDE_INSTALL_LIBDIR}/udev/rules.d)
message(STATUS "digitizer: Dependencies met, compiling.")
else()
message(WARNING "digitizer: Dependencies missing, not compiling.")
endif()

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plugins/digitizer/abstractdigitizerimpl.cpp Normal file
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@@ -0,0 +1,21 @@
/**
* SPDX-FileCopyrightText: 2025 Martin Sh <hemisputnik@proton.me>
*
* SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only OR LicenseRef-KDE-Accepted-GPL
*/
#include "abstractdigitizerimpl.h"
#include <QObject>
AbstractDigitizerImpl::AbstractDigitizerImpl(QObject *parent, const Device *device)
: QObject(parent)
, m_device(device)
{
}
const Device *AbstractDigitizerImpl::device() const
{
return m_device;
}
#include "moc_abstractdigitizerimpl.cpp"

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plugins/digitizer/abstractdigitizerimpl.h Normal file
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@@ -0,0 +1,32 @@
/**
* SPDX-FileCopyrightText: 2025 Martin Sh <hemisputnik@proton.me>
*
* SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only OR LicenseRef-KDE-Accepted-GPL
*/
#pragma once
#include <QObject>
#include "device.h"
#include "toolevent.h"
class AbstractDigitizerImpl : public QObject
{
Q_OBJECT
public:
explicit AbstractDigitizerImpl(QObject *parent, const Device *device);
virtual void startSession(int width, int height, int resolutionX, int resolutionY) = 0;
virtual void endSession() = 0;
virtual void onToolEvent(ToolEvent event) = 0;
protected:
const Device *device() const;
private:
const Device *m_device;
};

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plugins/digitizer/digitizerplugin.cpp Normal file
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@@ -0,0 +1,86 @@
/**
* SPDX-FileCopyrightText: 2025 Martin Sh <hemisputnik@proton.me>
*
* SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only OR LicenseRef-KDE-Accepted-GPL
*/
#include "digitizerplugin.h"
#include <KLocalizedString>
#include <KPluginFactory>
#include <QDebug>
#include <QGuiApplication>
#if defined(Q_OS_LINUX)
#include "linuxdigitizerimpl.h"
#endif
#include "plugin_digitizer_debug.h"
K_PLUGIN_CLASS_WITH_JSON(DigitizerPlugin, "kdeconnect_digitizer.json")
DigitizerPlugin::DigitizerPlugin(QObject *parent, const QVariantList &args)
: KdeConnectPlugin(parent, args)
, m_impl(nullptr)
{
#if defined(Q_OS_LINUX)
m_impl = new LinuxDigitizerImpl(this, device());
#endif
if (!m_impl) {
qWarning(KDECONNECT_PLUGIN_DIGITIZER) << "KDE Connect drawing tablet plugin was built without" << QGuiApplication::platformName() << "support.";
}
}
DigitizerPlugin::~DigitizerPlugin()
{
if (m_impl) {
m_impl->endSession();
delete m_impl;
}
}
void DigitizerPlugin::receivePacket(const NetworkPacket &np)
{
if (!m_impl)
return;
if (np.type() == PACKET_TYPE_DIGITIZER_SESSION) {
if (!np.has(QStringLiteral("action"))) {
qCWarning(KDECONNECT_PLUGIN_DIGITIZER) << "Received malformed session packet. Ignoring.";
return;
}
if (np.get<QString>(QStringLiteral("action")) == QStringLiteral("start")) {
if (!np.has(QStringLiteral("width")) || !np.has(QStringLiteral("height")) || !np.has(QStringLiteral("resolutionX"))
|| !np.has(QStringLiteral("resolutionY"))) {
qCWarning(KDECONNECT_PLUGIN_DIGITIZER) << "Received malformed session start packet. Ignoring.";
return;
}
m_impl->startSession(np.get<int>(QStringLiteral("width")),
np.get<int>(QStringLiteral("height")),
np.get<int>(QStringLiteral("resolutionX")),
np.get<int>(QStringLiteral("resolutionY")));
} else if (np.get<QString>(QStringLiteral("action")) == QStringLiteral("end")) {
m_impl->endSession();
}
return;
}
if (np.type() == PACKET_TYPE_DIGITIZER) {
m_impl->onToolEvent({
.active = np.has(QStringLiteral("active")) ? std::make_optional(np.get<bool>(QStringLiteral("active"))) : std::nullopt,
.touching = np.has(QStringLiteral("touching")) ? std::make_optional(np.get<bool>(QStringLiteral("touching"))) : std::nullopt,
.tool = np.has(QStringLiteral("tool")) ? std::make_optional(np.get<QString>(QStringLiteral("tool"))) : std::nullopt,
.x = np.has(QStringLiteral("x")) ? std::make_optional(np.get<int>(QStringLiteral("x"))) : std::nullopt,
.y = np.has(QStringLiteral("y")) ? std::make_optional(np.get<int>(QStringLiteral("y"))) : std::nullopt,
.pressure = np.has(QStringLiteral("pressure")) ? std::make_optional(np.get<double>(QStringLiteral("pressure"))) : std::nullopt,
});
}
}
#include "digitizerplugin.moc"
#include "moc_digitizerplugin.cpp"

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plugins/digitizer/digitizerplugin.h Normal file
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@@ -0,0 +1,33 @@
/**
* SPDX-FileCopyrightText: 2025 Martin Sh <hemisputnik@proton.me>
*
* SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only OR LicenseRef-KDE-Accepted-GPL
*/
// This plugin allows users to use their devices as pressure sensitive drawing
// tablets.
#pragma once
#include "abstractdigitizerimpl.h"
#include <QObject>
#include <core/kdeconnectplugin.h>
#define PACKET_TYPE_DIGITIZER_SESSION QStringLiteral("kdeconnect.digitizer.session")
#define PACKET_TYPE_DIGITIZER QStringLiteral("kdeconnect.digitizer")
class DigitizerPlugin : public KdeConnectPlugin
{
Q_OBJECT
public:
explicit DigitizerPlugin(QObject *parent, const QVariantList &args);
~DigitizerPlugin() override;
void receivePacket(const NetworkPacket &np) override;
private:
AbstractDigitizerImpl *m_impl;
};

21
plugins/digitizer/kdeconnect_digitizer.json Normal file
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@@ -0,0 +1,21 @@
{
"$schema": "../kdeconnect.schema.json",
"KPlugin": {
"Authors": [
{
"Email": "hemisputnik@proton.me",
"Name": "Martin Sh"
}
],
"Description": "Use your device as a pressure sensitive drawing tablet",
"EnabledByDefault": true,
"Icon": "input-tablet",
"License": "GPL",
"Name": "Drawing tablet"
},
"X-KdeConnect-OutgoingPacketType": [],
"X-KdeConnect-SupportedPacketType": [
"kdeconnect.digitizer.session",
"kdeconnect.digitizer"
]
}

176
plugins/digitizer/linuxdigitizerimpl.cpp Normal file
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@@ -0,0 +1,176 @@
/**
* SPDX-FileCopyrightText: 2025 Martin Sh <hemisputnik@proton.me>
*
* SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only OR LicenseRef-KDE-Accepted-GPL
*/
#include "linuxdigitizerimpl.h"
#include <core/daemon.h>
#include "abstractdigitizerimpl.h"
#include "plugin_digitizer_debug.h"
#include "toolevent.h"
#include <KLocalizedString>
#include <KMessageBox>
LinuxDigitizerImpl::LinuxDigitizerImpl(QObject *parent, const Device *device)
: AbstractDigitizerImpl(parent, device)
, m_dev(nullptr)
, m_uinput(nullptr)
{
}
static int enableAbsCode(libevdev *dev, unsigned int code, int min, int max, int resolution)
{
input_absinfo absinfo = {
.value = 0,
.minimum = min,
.maximum = max,
.fuzz = 0,
.flat = 0,
.resolution = resolution,
};
return libevdev_enable_event_code(dev, EV_ABS, code, &absinfo);
}
void LinuxDigitizerImpl::startSession(int width, int height, int resolutionX, int resolutionY)
{
// If a session already exists, we must first end the session, then create a new one.
if (m_dev != nullptr) {
endSession();
}
qCInfo(KDECONNECT_PLUGIN_DIGITIZER) << "Starting a new drawing tablet session."
<< "width:" << width << "height:" << height << "resolutionX:" << resolutionX << "resolutionY:" << resolutionY;
m_dev = libevdev_new();
libevdev_set_name(m_dev, device()->name().toUtf8().constData());
libevdev_set_id_bustype(m_dev, BUS_VIRTUAL);
libevdev_enable_event_type(m_dev, EV_SYN);
libevdev_enable_property(m_dev, INPUT_PROP_DIRECT);
libevdev_enable_property(m_dev, INPUT_PROP_POINTER);
libevdev_enable_event_type(m_dev, EV_KEY);
libevdev_enable_event_code(m_dev, EV_KEY, BTN_TOOL_PEN, nullptr);
libevdev_enable_event_code(m_dev, EV_KEY, BTN_TOOL_RUBBER, nullptr);
libevdev_enable_event_code(m_dev, EV_KEY, BTN_TOUCH, nullptr);
libevdev_enable_event_type(m_dev, EV_ABS);
enableAbsCode(m_dev, ABS_X, 0, width - 1, resolutionX);
enableAbsCode(m_dev, ABS_Y, 0, height - 1, resolutionY);
enableAbsCode(m_dev, ABS_PRESSURE, 0, 1023, 0);
if (int err = libevdev_uinput_create_from_device(m_dev, LIBEVDEV_UINPUT_OPEN_MANAGED, &m_uinput) != 0) {
qCCritical(KDECONNECT_PLUGIN_DIGITIZER) << "Failed to create uinput device:" << strerror(-err);
Daemon::instance()->sendSimpleNotification(QStringLiteral("digitizerError"),
i18n("KDE Connect Error"),
i18n("Unable to create a virtual drawing tablet. If this error persists, file a bug report."),
QStringLiteral("error"));
return;
}
qCInfo(KDECONNECT_PLUGIN_DIGITIZER) << "Started drawing tablet session successfully.";
}
void LinuxDigitizerImpl::endSession()
{
qCInfo(KDECONNECT_PLUGIN_DIGITIZER) << "Ending drawing tablet session.";
if (m_uinput != nullptr) {
libevdev_uinput_destroy(m_uinput);
m_uinput = nullptr;
}
if (m_dev != nullptr) {
libevdev_free(m_dev);
m_dev = nullptr;
}
}
void LinuxDigitizerImpl::onToolEvent(ToolEvent event)
{
if (m_uinput == nullptr) {
return;
}
bool anyEvent = false;
int err = 0;
if (event.active && !event.active.value()) {
// If the device reports an `active = false`, we set everything to zero (including the BTN_TOOL_* codes) to indicate
// to applications that the device is not tracking the tool anymore.
err = libevdev_uinput_write_event(m_uinput, EV_KEY, BTN_TOOL_PEN, 0);
err = libevdev_uinput_write_event(m_uinput, EV_KEY, BTN_TOOL_RUBBER, 0);
err = libevdev_uinput_write_event(m_uinput, EV_KEY, BTN_TOUCH, 0);
err = libevdev_uinput_write_event(m_uinput, EV_ABS, ABS_PRESSURE, 0);
err = libevdev_uinput_write_event(m_uinput, EV_ABS, ABS_X, 0);
err = libevdev_uinput_write_event(m_uinput, EV_ABS, ABS_Y, 0);
anyEvent = true;
} else {
bool dontReportPressure = false;
if (event.touching) {
// We must jump through some hoops in order to set the pressure to zero if the tool is not touching the screen,
// otherwise apps will think otherwise.
if (event.touching.value()) {
err = libevdev_uinput_write_event(m_uinput, EV_KEY, BTN_TOUCH, 1);
} else {
err = libevdev_uinput_write_event(m_uinput, EV_KEY, BTN_TOUCH, 0);
err = libevdev_uinput_write_event(m_uinput, EV_ABS, ABS_PRESSURE, 0);
dontReportPressure = true;
}
anyEvent = true;
}
if (event.tool) {
QString tool = event.tool.value();
err = libevdev_uinput_write_event(m_uinput, EV_KEY, BTN_TOOL_PEN, tool == TOOL_PEN);
err = libevdev_uinput_write_event(m_uinput, EV_KEY, BTN_TOOL_RUBBER, tool == TOOL_RUBBER);
anyEvent = true;
}
if (event.x) {
err = libevdev_uinput_write_event(m_uinput, EV_ABS, ABS_X, event.x.value());
anyEvent = true;
}
if (event.y) {
err = libevdev_uinput_write_event(m_uinput, EV_ABS, ABS_Y, event.y.value());
anyEvent = true;
}
if (!dontReportPressure && event.pressure) {
err = libevdev_uinput_write_event(m_uinput, EV_ABS, ABS_PRESSURE, event.pressure.value() * 1023);
anyEvent = true;
}
}
if (anyEvent) {
err = libevdev_uinput_write_event(m_uinput, EV_SYN, SYN_REPORT, 0);
}
if (err != 0) {
qCCritical(KDECONNECT_PLUGIN_DIGITIZER) << "Failed to emit events:" << strerror(-err);
Daemon::instance()->sendSimpleNotification(
QStringLiteral("digitizerError"),
i18n("KDE Connect Error"),
i18n("Unable to process one or more input events for the virtual device. If this error persists, file a bug report."),
QStringLiteral("error"));
endSession();
}
}
#include "moc_linuxdigitizerimpl.cpp"

32
plugins/digitizer/linuxdigitizerimpl.h Normal file
View File

@@ -0,0 +1,32 @@
/**
* SPDX-FileCopyrightText: 2025 Martin Sh <hemisputnik@proton.me>
*
* SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only OR LicenseRef-KDE-Accepted-GPL
*/
#pragma once
#include "abstractdigitizerimpl.h"
#include <QObject>
#include <libevdev/libevdev-uinput.h>
#include <libevdev/libevdev.h>
#include <qobject.h>
class LinuxDigitizerImpl : public AbstractDigitizerImpl
{
Q_OBJECT
public:
explicit LinuxDigitizerImpl(QObject *parent, const Device *device);
void startSession(int width, int height, int resolutionX, int resolutionY) override;
void endSession() override;
void onToolEvent(ToolEvent event) override;
private:
libevdev *m_dev;
libevdev_uinput *m_uinput;
};

22
plugins/digitizer/toolevent.h Normal file
View File

@@ -0,0 +1,22 @@
/**
* SPDX-FileCopyrightText: 2025 Martin Sh <hemisputnik@proton.me>
*
* SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only OR LicenseRef-KDE-Accepted-GPL
*/
#pragma once
#include <QString>
#include <optional>
#define TOOL_PEN QStringLiteral("Pen")
#define TOOL_RUBBER QStringLiteral("Rubber")
struct ToolEvent {
std::optional<bool> active;
std::optional<bool> touching;
std::optional<QString> tool;
std::optional<int> x;
std::optional<int> y;
std::optional<double> pressure;
};

6
plugins/kdeconnect.notifyrc
View File

@@ -1033,6 +1033,12 @@ Comment[zh_TW]=接收到簡訊
Action=Popup
Urgency=Low
[Event/digitizerError]
Name=Drawing Tablet Error
Comment=Something went wrong with the drawing tablet plugin
Action=Popup
Urgency=Critical
[Event/error]
Name=Error
Name[ar]=خطأ