kwin/src/inputmethod.cpp

/*
    KWin - the KDE window manager
    This file is part of the KDE project.

    SPDX-FileCopyrightText: 2016 Martin Gräßlin <mgraesslin@kde.org>

    SPDX-License-Identifier: GPL-2.0-or-later
*/
#include <config-kwin.h>
#include "inputmethod.h"
#include "abstract_client.h"
#include "virtualkeyboard_dbus.h"
#include "input.h"
#include "inputpanelv1client.h"
#include "keyboard_input.h"
#include "utils/common.h"
#include "screens.h"
#include "wayland_server.h"
#include "workspace.h"
#if KWIN_BUILD_SCREENLOCKER
#include "screenlockerwatcher.h"
#endif
#include "deleted.h"
#include "touch_input.h"
#include "tablet_input.h"

#include <KWaylandServer/display.h>
#include <KWaylandServer/keyboard_interface.h>
#include <KWaylandServer/seat_interface.h>
#include <KWaylandServer/textinput_v3_interface.h>
#include <KWaylandServer/surface_interface.h>
#include <KWaylandServer/inputmethod_v1_interface.h>

#include <KShell>
#include <KLocalizedString>

#include <QDBusConnection>
#include <QDBusPendingCall>
#include <QDBusMessage>
#include <QMenu>
#include <QKeyEvent>

#include <linux/input-event-codes.h>
#include <xkbcommon/xkbcommon-keysyms.h>
#include <unistd.h>

using namespace KWaylandServer;

namespace KWin
{

KWIN_SINGLETON_FACTORY(InputMethod)

InputMethod::InputMethod(QObject *parent)
    : QObject(parent)
{
    m_enabled = kwinApp()->config()->group("Wayland").readEntry("VirtualKeyboardEnabled", true);
    // this is actually too late. Other processes are started before init,
    // so might miss the availability of text input
    // but without Workspace we don't have the window listed at all
    if (workspace()) {
        init();
    } else {
        connect(kwinApp(), &Application::workspaceCreated, this, &InputMethod::init);
    }
}

InputMethod::~InputMethod()
{
    stopInputMethod();
    s_self = nullptr;
}

void InputMethod::init()
{
    // Stop restarting the input method if it starts crashing very frequently
    m_inputMethodCrashTimer.setInterval(20000);
    m_inputMethodCrashTimer.setSingleShot(true);
    connect(&m_inputMethodCrashTimer, &QTimer::timeout, this, [this] {
        m_inputMethodCrashes = 0;
    });
#if KWIN_BUILD_SCREENLOCKER
    connect(ScreenLockerWatcher::self(), &ScreenLockerWatcher::aboutToLock, this, &InputMethod::hide);
#endif

    new VirtualKeyboardDBus(this);
    qCDebug(KWIN_VIRTUALKEYBOARD) << "Registering the DBus interface";

    if (waylandServer()) {
        new TextInputManagerV2Interface(waylandServer()->display());
        new TextInputManagerV3Interface(waylandServer()->display());

        connect(waylandServer()->seat(), &SeatInterface::focusedTextInputSurfaceChanged, this, &InputMethod::handleFocusedSurfaceChanged);

        TextInputV2Interface *textInputV2 = waylandServer()->seat()->textInputV2();
        connect(textInputV2, &TextInputV2Interface::requestShowInputPanel, this, &InputMethod::show);
        connect(textInputV2, &TextInputV2Interface::requestHideInputPanel, this, &InputMethod::hide);
        connect(textInputV2, &TextInputV2Interface::surroundingTextChanged, this, &InputMethod::surroundingTextChanged);
        connect(textInputV2, &TextInputV2Interface::contentTypeChanged, this, &InputMethod::contentTypeChanged);
        connect(textInputV2, &TextInputV2Interface::stateUpdated, this, &InputMethod::textInputInterfaceV2StateUpdated);
        connect(textInputV2, &TextInputV2Interface::enabledChanged, this, &InputMethod::textInputInterfaceV2EnabledChanged);

        TextInputV3Interface *textInputV3 = waylandServer()->seat()->textInputV3();
        connect(textInputV3, &TextInputV3Interface::surroundingTextChanged, this, &InputMethod::surroundingTextChanged);
        connect(textInputV3, &TextInputV3Interface::contentTypeChanged, this, &InputMethod::contentTypeChanged);
        connect(textInputV3, &TextInputV3Interface::stateCommitted, this, &InputMethod::stateCommitted);
        connect(textInputV3, &TextInputV3Interface::enabledChanged, this, &InputMethod::textInputInterfaceV3EnabledChanged);

        connect(input()->keyboard()->xkb(), &Xkb::modifierStateChanged, this, [this]() {
            m_hasPendingModifiers = true;
        });
    }
}

void InputMethod::show()
{
    if (m_inputClient) {
        m_inputClient->showClient();
        updateInputPanelState();
    }
}

void InputMethod::hide()
{
    if (m_inputClient) {
        m_inputClient->hideClient();
        updateInputPanelState();
    }
}

bool InputMethod::shouldShowOnActive() const
{
    return input()->touch() == input()->lastInputHandler()
        || input()->tablet() == input()->lastInputHandler();
}

void InputMethod::setActive(bool active)
{
    const bool wasActive = waylandServer()->inputMethod()->context();
    if (wasActive && !active) {
        waylandServer()->inputMethod()->sendDeactivate();
    }

    if (active) {
        if (!m_enabled) {
            return;
        }

        if (!wasActive) {
            waylandServer()->inputMethod()->sendActivate();
        }
        adoptInputMethodContext();
    } else {
        updateInputPanelState();
    }

    if (wasActive != isActive()) {
        Q_EMIT activeChanged(active);
    }
}

InputPanelV1Client *InputMethod::panel() const
{
    return m_inputClient;
}

void InputMethod::setPanel(InputPanelV1Client *client)
{
    Q_ASSERT(client->isInputMethod());
    if (m_inputClient) {
        qCWarning(KWIN_VIRTUALKEYBOARD) << "Replacing input client" << m_inputClient << "with" << client;
        disconnect(m_inputClient, nullptr, this, nullptr);
    }

    m_inputClient = client;
    connect(client->surface(), &SurfaceInterface::inputChanged, this, &InputMethod::updateInputPanelState);
    connect(client, &QObject::destroyed, this, [this] {
        if (m_trackedClient) {
            m_trackedClient->setVirtualKeyboardGeometry({});
        }
    });
    connect(m_inputClient, &AbstractClient::frameGeometryChanged, this, &InputMethod::updateInputPanelState);
    connect(m_inputClient, &AbstractClient::windowHidden, this, &InputMethod::updateInputPanelState);
    connect(m_inputClient, &AbstractClient::windowClosed, this, &InputMethod::updateInputPanelState);
    connect(m_inputClient, &AbstractClient::windowShown, this, &InputMethod::visibleChanged);
    connect(m_inputClient, &AbstractClient::windowHidden, this, &InputMethod::visibleChanged);
    connect(m_inputClient, &AbstractClient::windowClosed, this, &InputMethod::visibleChanged);
    Q_EMIT visibleChanged();
    updateInputPanelState();
    Q_EMIT panelChanged();
}

void InputMethod::setTrackedClient(AbstractClient* trackedClient)
{
    // Reset the old client virtual keybaord geom if necessary
    // Old and new clients could be the same if focus moves between subsurfaces
    if (m_trackedClient == trackedClient) {
        return;
    }
    if (m_trackedClient) {
        m_trackedClient->setVirtualKeyboardGeometry(QRect());
        disconnect(m_trackedClient, &AbstractClient::frameGeometryChanged, this, &InputMethod::updateInputPanelState);
    }
    m_trackedClient = trackedClient;
    if (m_trackedClient) {
        connect(m_trackedClient, &AbstractClient::frameGeometryChanged, this, &InputMethod::updateInputPanelState, Qt::QueuedConnection);
    }
    updateInputPanelState();
}

void InputMethod::handleFocusedSurfaceChanged()
{
    SurfaceInterface *focusedSurface = waylandServer()->seat()->focusedTextInputSurface();
    setTrackedClient(waylandServer()->findClient(focusedSurface));
    if (!focusedSurface) {
        setActive(false);
    }
}

void InputMethod::surroundingTextChanged()
{
    auto t2 = waylandServer()->seat()->textInputV2();
    auto t3 = waylandServer()->seat()->textInputV3();
    auto inputContext = waylandServer()->inputMethod()->context();
    if (!inputContext) {
        return;
    }
    if (t2 && t2->isEnabled()) {
        inputContext->sendSurroundingText(t2->surroundingText(), t2->surroundingTextCursorPosition(), t2->surroundingTextSelectionAnchor());
        return;
    }
    if (t3 && t3->isEnabled()) {
        inputContext->sendSurroundingText(t3->surroundingText(), t3->surroundingTextCursorPosition(), t3->surroundingTextSelectionAnchor());
        return;
    }
}

void InputMethod::contentTypeChanged()
{
    auto t2 = waylandServer()->seat()->textInputV2();
    auto t3 = waylandServer()->seat()->textInputV3();
    auto inputContext = waylandServer()->inputMethod()->context();
    if (!inputContext) {
        return;
    }
    if (t2 && t2->isEnabled()) {
        inputContext->sendContentType(t2->contentHints(), t2->contentPurpose());
    }
    if (t3 && t3->isEnabled()) {
        inputContext->sendContentType(t3->contentHints(), t3->contentPurpose());
    }
}

void InputMethod::textInputInterfaceV2StateUpdated(quint32 serial, KWaylandServer::TextInputV2Interface::UpdateReason reason)
{
    if (!m_enabled) {
        return;
    }
    Q_UNUSED(serial);

    auto t2 = waylandServer()->seat()->textInputV2();
    auto inputContext = waylandServer()->inputMethod()->context();
    if (!inputContext) {
        return;
    }
    if (!t2 || !t2->isEnabled()) {
        return;
    }
    if (m_inputClient && shouldShowOnActive()) {
        m_inputClient->allow();
    }
    switch (reason) {
    case KWaylandServer::TextInputV2Interface::UpdateReason::StateChange:
        break;
    case KWaylandServer::TextInputV2Interface::UpdateReason::StateEnter:
    case KWaylandServer::TextInputV2Interface::UpdateReason::StateFull:
        adoptInputMethodContext();
        break;
    case KWaylandServer::TextInputV2Interface::UpdateReason::StateReset:
        inputContext->sendReset();
        break;
    }
}

void InputMethod::textInputInterfaceV2EnabledChanged()
{
    if (!m_enabled) {
        return;
    }

    auto t = waylandServer()->seat()->textInputV2();
    setActive(t->isEnabled());
}

void InputMethod::textInputInterfaceV3EnabledChanged()
{
    if (!m_enabled) {
        return;
    }

    auto t3 = waylandServer()->seat()->textInputV3();
    setActive(t3->isEnabled());
    if (!t3->isEnabled()) {
        // reset value of preedit when textinput is disabled
        resetPendingPreedit();
    }
    auto context = waylandServer()->inputMethod()->context();
    if (context) {
        context->sendReset();
        adoptInputMethodContext();
    }
}

void InputMethod::stateCommitted(uint32_t serial)
{
    if (!isEnabled()) {
        return;
    }
    TextInputV3Interface *textInputV3 = waylandServer()->seat()->textInputV3();
    if (!textInputV3) {
        return;
    }

    if (auto inputContext = waylandServer()->inputMethod()->context()) {
        inputContext->sendCommitState(serial);
    }
    setActive(textInputV3->isEnabled());
}

void InputMethod::setEnabled(bool enabled)
{
    if (m_enabled == enabled) {
        return;
    }
    m_enabled = enabled;
    Q_EMIT enabledChanged(m_enabled);

    // send OSD message
    QDBusMessage msg = QDBusMessage::createMethodCall(
        QStringLiteral("org.kde.plasmashell"),
        QStringLiteral("/org/kde/osdService"),
        QStringLiteral("org.kde.osdService"),
        QStringLiteral("virtualKeyboardEnabledChanged")
    );
    msg.setArguments({enabled});
    QDBusConnection::sessionBus().asyncCall(msg);
    if (!m_enabled) {
        hide();
        stopInputMethod();
    } else {
        startInputMethod();
    }
    // save value into config
    kwinApp()->config()->group("Wayland").writeEntry("VirtualKeyboardEnabled", m_enabled);
    kwinApp()->config()->sync();
}

static quint32 keysymToKeycode(quint32 sym)
{
    switch(sym) {
    case XKB_KEY_BackSpace:
        return KEY_BACKSPACE;
    case XKB_KEY_Return:
        return KEY_ENTER;
    case XKB_KEY_Left:
        return KEY_LEFT;
    case XKB_KEY_Right:
        return KEY_RIGHT;
    case XKB_KEY_Up:
        return KEY_UP;
    case XKB_KEY_Down:
        return KEY_DOWN;
    default:
        return KEY_UNKNOWN;
    }
}

void InputMethod::keysymReceived(quint32 serial, quint32 time, quint32 sym, bool pressed, quint32 modifiers)
{
    Q_UNUSED(serial)
    Q_UNUSED(time)
    auto t2 = waylandServer()->seat()->textInputV2();
    if (t2 && t2->isEnabled()) {
        if (pressed) {
            t2->keysymPressed(sym, modifiers);
        } else {
            t2->keysymReleased(sym, modifiers);
        }
        return;
    }
    auto t3 = waylandServer()->seat()->textInputV3();
    if (t3 && t3->isEnabled()) {
        KWaylandServer::KeyboardKeyState state;
        if (pressed) {
            state = KWaylandServer::KeyboardKeyState::Pressed;
        } else {
            state = KWaylandServer::KeyboardKeyState::Released;
        }
        waylandServer()->seat()->notifyKeyboardKey(keysymToKeycode(sym), state);
        return;
    }
}

void InputMethod::commitString(qint32 serial, const QString &text)
{
    Q_UNUSED(serial)
    if (auto t2 = waylandServer()->seat()->textInputV2(); t2 && t2->isEnabled()) {
        t2->commitString(text.toUtf8());
        t2->preEdit({}, {});
        return;
    } else if (auto t3 = waylandServer()->seat()->textInputV3(); t3 && t3->isEnabled()) {
        t3->commitString(text.toUtf8());
        t3->done();
        return;
    } else {
        qCWarning(KWIN_VIRTUALKEYBOARD) << "We have nobody to commit to!!!";
    }
}

void InputMethod::deleteSurroundingText(int32_t index, uint32_t length)
{
    // zwp_input_method_v1 Delete surrounding text interface is designed for text-input-v1.
    // The parameter has different meaning in text-input-v{2,3}.
    // Current cursor is at index 0.
    // The actualy deleted text range is [index, index + length].
    // In v{2,3}'s before/after style, text to be deleted with v{2,3} interface is [-before, after].
    // And before/after are all unsigned, which make it impossible to do certain things.
    // Those request will be ignored.

    // Verify we can handle such request.
    if (index > 0 || index + static_cast<ssize_t>(length) < 0) {
        return;
    }
    const quint32 before = -index;
    const quint32 after = index + length;

    auto t2 = waylandServer()->seat()->textInputV2();
    if (t2 && t2->isEnabled()) {
        t2->deleteSurroundingText(before, after);
    }
    auto t3 = waylandServer()->seat()->textInputV3();
    if (t3 && t3->isEnabled()) {
        t3->deleteSurroundingText(before, after);
        t3->done();
    }
}

void InputMethod::setCursorPosition(qint32 index, qint32 anchor)
{
    auto t2 = waylandServer()->seat()->textInputV2();
    if (t2 && t2->isEnabled()) {
        t2->setCursorPosition(index, anchor);
    }
}

void InputMethod::setLanguage(uint32_t serial, const QString &language)
{
    Q_UNUSED(serial)
    auto t2 = waylandServer()->seat()->textInputV2();
    if (t2 && t2->isEnabled()) {
        t2->setLanguage(language.toUtf8());
    }
}

void InputMethod::setTextDirection(uint32_t serial, Qt::LayoutDirection direction)
{
    Q_UNUSED(serial)
    auto t2 = waylandServer()->seat()->textInputV2();
    if (t2 && t2->isEnabled()) {
        t2->setTextDirection(direction);
    }
}

void InputMethod::setPreeditCursor(qint32 index)
{
    auto t2 = waylandServer()->seat()->textInputV2();
    if (t2 && t2->isEnabled()) {
        t2->setPreEditCursor(index);
    }
    auto t3 = waylandServer()->seat()->textInputV3();
    if (t3 && t3->isEnabled()) {
        preedit.cursor = index;
    }
}

void InputMethod::setPreeditStyling(quint32 index, quint32 length, quint32 style)
{
    auto t2 = waylandServer()->seat()->textInputV2();
    if (t2 && t2->isEnabled()) {
        t2->preEditStyling(index, length, style);
    }
    auto t3 = waylandServer()->seat()->textInputV3();
    if (t3 && t3->isEnabled()) {
        // preedit style: highlight(4) or selection(6)
        if (style == 4 || style == 6) {
            preedit.highlightRanges.emplace_back(index, index + length);
        }
    }
}

void InputMethod::setPreeditString(uint32_t serial, const QString &text, const QString &commit)
{
    Q_UNUSED(serial)
    auto t2 = waylandServer()->seat()->textInputV2();
    if (t2 && t2->isEnabled()) {
        t2->preEdit(text.toUtf8(), commit.toUtf8());
    }
    auto t3 = waylandServer()->seat()->textInputV3();
    if (t3 && t3->isEnabled()) {
        preedit.text = text;
        if (!preedit.text.isEmpty()) {
            quint32 cursor = 0, cursorEnd = 0;
            if (preedit.cursor > 0) {
                cursor = cursorEnd = preedit.cursor;
            }
            // Check if we can convert highlight style to a range of selection.
            if (!preedit.highlightRanges.empty()) {
                std::sort(preedit.highlightRanges.begin(), preedit.highlightRanges.end());
                // Check if starting point matches.
                if (preedit.highlightRanges.front().first == cursor) {
                    quint32 end = preedit.highlightRanges.front().second;
                    bool nonContinousHighlight = false;
                    for (size_t i = 1 ; i < preedit.highlightRanges.size(); i ++) {
                        if (end >= preedit.highlightRanges[i].first) {
                            end = std::max(end, preedit.highlightRanges[i].second);
                        } else {
                            nonContinousHighlight = true;
                            break;
                        }
                    }
                    if (!nonContinousHighlight) {
                        cursorEnd = end;
                    }
                }
            }

            t3->sendPreEditString(preedit.text, cursor, cursorEnd);
        }
        t3->done();
    }
    resetPendingPreedit();
}

void InputMethod::key(quint32 /*serial*/, quint32 /*time*/, quint32 keyCode, bool pressed)
{
    waylandServer()->seat()->notifyKeyboardKey(keyCode, pressed ? KWaylandServer::KeyboardKeyState::Pressed : KWaylandServer::KeyboardKeyState::Released);
}

void InputMethod::modifiers(quint32 serial, quint32 mods_depressed, quint32 mods_latched, quint32 mods_locked, quint32 group)
{
    Q_UNUSED(serial)
    auto xkb = input()->keyboard()->xkb();
    xkb->updateModifiers(mods_depressed, mods_latched, mods_locked, group);
}

void InputMethod::forwardModifiers(ForwardModifiersForce force)
{
    const bool sendModifiers = m_hasPendingModifiers || force == Force;
    m_hasPendingModifiers = false;
    if (!sendModifiers) {
        return;
    }
    auto xkb = input()->keyboard()->xkb();
    if (m_keyboardGrab) {
        m_keyboardGrab->sendModifiers(waylandServer()->display()->nextSerial(),
                                      xkb->modifierState().depressed,
                                      xkb->modifierState().latched,
                                      xkb->modifierState().locked,
                                      xkb->currentLayout());
    }
}

void InputMethod::adoptInputMethodContext()
{
    auto inputContext = waylandServer()->inputMethod()->context();

    TextInputV2Interface *t2 = waylandServer()->seat()->textInputV2();
    TextInputV3Interface *t3 = waylandServer()->seat()->textInputV3();

    if (t2 && t2->isEnabled()) {
        inputContext->sendSurroundingText(t2->surroundingText(), t2->surroundingTextCursorPosition(), t2->surroundingTextSelectionAnchor());
        inputContext->sendPreferredLanguage(t2->preferredLanguage());
        inputContext->sendContentType(t2->contentHints(), t2->contentPurpose());
        connect(inputContext, &KWaylandServer::InputMethodContextV1Interface::language, this, &InputMethod::setLanguage);
        connect(inputContext, &KWaylandServer::InputMethodContextV1Interface::textDirection, this, &InputMethod::setTextDirection);
    }

    if (t3 && t3->isEnabled()) {
        inputContext->sendSurroundingText(t3->surroundingText(), t3->surroundingTextCursorPosition(), t3->surroundingTextSelectionAnchor());
        inputContext->sendContentType(t3->contentHints(), t3->contentPurpose());
    }
    inputContext->sendCommitState(m_serial++);

    connect(inputContext, &KWaylandServer::InputMethodContextV1Interface::keysym, this, &InputMethod::keysymReceived, Qt::UniqueConnection);
    connect(inputContext, &KWaylandServer::InputMethodContextV1Interface::key, this, &InputMethod::key, Qt::UniqueConnection);
    connect(inputContext, &KWaylandServer::InputMethodContextV1Interface::modifiers, this, &InputMethod::modifiers, Qt::UniqueConnection);
    connect(inputContext, &KWaylandServer::InputMethodContextV1Interface::commitString, this, &InputMethod::commitString, Qt::UniqueConnection);
    connect(inputContext, &KWaylandServer::InputMethodContextV1Interface::deleteSurroundingText, this, &InputMethod::deleteSurroundingText, Qt::UniqueConnection);
    connect(inputContext, &KWaylandServer::InputMethodContextV1Interface::cursorPosition, this, &InputMethod::setCursorPosition, Qt::UniqueConnection);
    connect(inputContext, &KWaylandServer::InputMethodContextV1Interface::preeditStyling, this, &InputMethod::setPreeditStyling, Qt::UniqueConnection);
    connect(inputContext, &KWaylandServer::InputMethodContextV1Interface::preeditString, this, &InputMethod::setPreeditString, Qt::UniqueConnection);
    connect(inputContext, &KWaylandServer::InputMethodContextV1Interface::preeditCursor, this, &InputMethod::setPreeditCursor, Qt::UniqueConnection);
    connect(inputContext, &KWaylandServer::InputMethodContextV1Interface::keyboardGrabRequested, this, &InputMethod::installKeyboardGrab, Qt::UniqueConnection);
    connect(inputContext, &KWaylandServer::InputMethodContextV1Interface::modifiersMap, this, &InputMethod::updateModifiersMap, Qt::UniqueConnection);
}

void InputMethod::updateInputPanelState()
{
    if (!waylandServer()) {
        return;
    }

    auto t = waylandServer()->seat()->textInputV2();

    if (!t) {
        return;
    }

    if (m_inputClient && shouldShowOnActive()) {
        m_inputClient->allow();
    }

    QRect overlap = QRect(0, 0, 0, 0);
    if (m_trackedClient) {
        const bool bottomKeyboard = m_inputClient && m_inputClient->mode() != InputPanelV1Client::Overlay && m_inputClient->isShown();
        m_trackedClient->setVirtualKeyboardGeometry(bottomKeyboard ? m_inputClient->inputGeometry() : QRect());

        if (m_inputClient) {
            overlap = m_trackedClient->frameGeometry() & m_inputClient->inputGeometry();
            overlap.moveTo(m_trackedClient->mapToLocal(overlap.topLeft()));
        }
    }
    t->setInputPanelState(m_inputClient && m_inputClient->isShown(), overlap);
}

void InputMethod::setInputMethodCommand(const QString &command)
{
    if (m_inputMethodCommand == command) {
        return;
    }

    m_inputMethodCommand = command;

    if (m_enabled) {
        startInputMethod();
    }
    Q_EMIT availableChanged();
}

void InputMethod::stopInputMethod()
{
    if (!m_inputMethodProcess) {
        return;
    }
    disconnect(m_inputMethodProcess, nullptr, this, nullptr);

    m_inputMethodProcess->terminate();
    if (!m_inputMethodProcess->waitForFinished()) {
        m_inputMethodProcess->kill();
        m_inputMethodProcess->waitForFinished();
    }
    m_inputMethodProcess->deleteLater();
    m_inputMethodProcess = nullptr;

    waylandServer()->destroyInputMethodConnection();
}

void InputMethod::startInputMethod()
{
    stopInputMethod();
    if (m_inputMethodCommand.isEmpty() || kwinApp()->isTerminating()) {
        return;
    }

    QStringList arguments = KShell::splitArgs(m_inputMethodCommand);
    if (arguments.isEmpty()) {
        qWarning("Failed to launch the input method server: %s is an invalid command", qPrintable(m_inputMethodCommand));
        return;
    }

    const QString program = arguments.takeFirst();
    int socket = waylandServer()->createInputMethodConnection();
    if (socket < 0) {
        qWarning("Failed to create the input method connection");
        return;
    }
    socket = dup(socket);

    QProcessEnvironment environment = kwinApp()->processStartupEnvironment();
    environment.insert(QStringLiteral("WAYLAND_SOCKET"), QByteArray::number(socket));
    environment.insert(QStringLiteral("QT_QPA_PLATFORM"), QStringLiteral("wayland"));
    // When we use Maliit as virtual keyboard, we want KWin to handle the animation
    // since that works a lot better. So we need to tell Maliit to not do client side
    // animation.
    environment.insert(QStringLiteral("MALIIT_ENABLE_ANIMATIONS"), "0");

    m_inputMethodProcess = new QProcess(this);
    m_inputMethodProcess->setProcessChannelMode(QProcess::ForwardedErrorChannel);
    m_inputMethodProcess->setProcessEnvironment(environment);
    m_inputMethodProcess->setProgram(program);
    m_inputMethodProcess->setArguments(arguments);
    m_inputMethodProcess->start();
    close(socket);
    connect(m_inputMethodProcess, QOverload<int, QProcess::ExitStatus>::of(&QProcess::finished), this, [this](int exitCode, QProcess::ExitStatus exitStatus) {
        if (exitStatus == QProcess::CrashExit) {
            m_inputMethodCrashes++;
            m_inputMethodCrashTimer.start();
            qWarning() << "Input Method crashed" << m_inputMethodProcess->program() << m_inputMethodProcess->arguments() << exitCode << exitStatus;
            if (m_inputMethodCrashes < 5) {
                startInputMethod();
            } else {
                qWarning() << "Input Method keeps crashing, please fix" << m_inputMethodProcess->program() << m_inputMethodProcess->arguments();
                stopInputMethod();
            }
        }
    });
}
bool InputMethod::isActive() const
{
    return waylandServer()->inputMethod()->context();
}

KWaylandServer::InputMethodGrabV1 *InputMethod::keyboardGrab()
{
    return isActive() ? m_keyboardGrab : nullptr;
}

void InputMethod::installKeyboardGrab(KWaylandServer::InputMethodGrabV1 *keyboardGrab)
{
    auto xkb = input()->keyboard()->xkb();
    m_keyboardGrab = keyboardGrab;
    keyboardGrab->sendKeymap(xkb->keymapContents());
    forwardModifiers(Force);
}

void InputMethod::updateModifiersMap(const QByteArray &modifiers)
{
    TextInputV2Interface *t2 = waylandServer()->seat()->textInputV2();

    if (t2 && t2->isEnabled()) {
        t2->setModifiersMap(modifiers);
    }
}

bool InputMethod::isVisible() const
{
    return m_inputClient && m_inputClient->isShown();
}

bool InputMethod::isAvailable() const
{
    return !m_inputMethodCommand.isEmpty();
}

void InputMethod::resetPendingPreedit() {
    preedit.text = QString();
    preedit.cursor = 0;
    preedit.highlightRanges.clear();
}

}