File indexing completed on 2024-11-10 04:57:48

 /*
     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 "inputmethod.h"
 
 #include <config-kwin.h>
 
 #include "input.h"
 #include "inputpanelv1window.h"
 #include "keyboard_input.h"
 #include "utils/common.h"
 #include "virtualkeyboard_dbus.h"
 #include "wayland_server.h"
 #include "window.h"
 #include "workspace.h"
 #if KWIN_BUILD_SCREENLOCKER
 #include "screenlockerwatcher.h"
 #endif
 #include "tablet_input.h"
 #include "touch_input.h"
 #include "wayland/display.h"
 #include "wayland/inputmethod_v1.h"
 #include "wayland/keyboard.h"
 #include "wayland/seat.h"
 #include "wayland/surface.h"
 #include "wayland/textinput_v1.h"
 #include "wayland/textinput_v3.h"
 #include "xkb.h"
 
 #include <KLocalizedString>
 #include <KShell>
 #include <KKeyServer>
 
 #include <QDBusConnection>
 #include <QDBusMessage>
 #include <QDBusPendingCall>
 #include <QKeyEvent>
 #include <QMenu>
 
 #include <linux/input-event-codes.h>
 #include <unistd.h>
 #include <xkbcommon/xkbcommon-keysyms.h>
 
 namespace KWin
 {
 
 static std::vector<quint32> textToKey(const QString &text)
 {
     if (text.isEmpty()) {
         return {};
     }
 
     auto sequence = QKeySequence::fromString(text);
     if (sequence.isEmpty()) {
         return {};
     }
 
     const QList<int> syms(KKeyServer::keyQtToSymXs(sequence[0]));
     if (syms.empty()) {
         return {};
     }
 
     std::optional<int> keyCode;
     for (int sym : syms) {
         auto code = input()->keyboard()->xkb()->keycodeFromKeysym(sym);
         if (code) {
             keyCode = code;
             break;
         }
     }
     if (!keyCode) {
         return {};
     }
 
     if (text.isUpper()) {
         return {KEY_LEFTSHIFT, quint32(keyCode.value())};
     }
 
     return {quint32(keyCode.value())};
 }
 
 InputMethod::InputMethod()
 {
     m_enabled = kwinApp()->config()->group(QStringLiteral("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();
 }
 
 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(kwinApp()->screenLockerWatcher(), &ScreenLockerWatcher::aboutToLock, this, &InputMethod::hide);
 #endif
 
     new VirtualKeyboardDBus(this);
     qCDebug(KWIN_VIRTUALKEYBOARD) << "Registering the DBus interface";
 
     if (waylandServer()) {
         new TextInputManagerV1Interface(waylandServer()->display(), this);
         new TextInputManagerV2Interface(waylandServer()->display(), this);
         new TextInputManagerV3Interface(waylandServer()->display(), this);
 
         connect(waylandServer()->seat(), &SeatInterface::focusedTextInputSurfaceChanged, this, &InputMethod::handleFocusedSurfaceChanged);
 
         TextInputV1Interface *textInputV1 = waylandServer()->seat()->textInputV1();
         connect(textInputV1, &TextInputV1Interface::requestShowInputPanel, this, &InputMethod::show);
         connect(textInputV1, &TextInputV1Interface::requestHideInputPanel, this, &InputMethod::hide);
         connect(textInputV1, &TextInputV1Interface::surroundingTextChanged, this, &InputMethod::surroundingTextChanged);
         connect(textInputV1, &TextInputV1Interface::contentTypeChanged, this, &InputMethod::contentTypeChanged);
         connect(textInputV1, &TextInputV1Interface::stateUpdated, this, &InputMethod::textInputInterfaceV1StateUpdated);
         connect(textInputV1, &TextInputV1Interface::reset, this, &InputMethod::textInputInterfaceV1Reset);
         connect(textInputV1, &TextInputV1Interface::invokeAction, this, &InputMethod::invokeAction);
         connect(textInputV1, &TextInputV1Interface::enabledChanged, this, &InputMethod::textInputInterfaceV1EnabledChanged);
 
         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(textInputV3, &TextInputV3Interface::enableRequested, this, &InputMethod::textInputInterfaceV3EnableRequested);
 
         connect(input()->keyboard()->xkb(), &Xkb::modifierStateChanged, this, [this]() {
             m_hasPendingModifiers = true;
         });
     }
 }
 
 void InputMethod::show()
 {
     m_shouldShowPanel = true;
     if (m_panel) {
         m_panel->show();
         updateInputPanelState();
     } else {
         if (!isActive()) {
             refreshActive();
         }
 
         // refreshActive affects the result of isActive
         if (isActive()) {
             adoptInputMethodContext();
         }
     }
 }
 
 void InputMethod::hide()
 {
     m_shouldShowPanel = false;
     if (m_panel) {
         m_panel->hide();
         updateInputPanelState();
     }
 }
 
 bool InputMethod::shouldShowOnActive() const
 {
     static bool alwaysShowIm = qEnvironmentVariableIntValue("KWIN_IM_SHOW_ALWAYS") != 0;
     return alwaysShowIm || input()->touch() == input()->lastInputHandler()
         || input()->tablet() == input()->lastInputHandler();
 }
 
 void InputMethod::refreshActive()
 {
     auto seat = waylandServer()->seat();
     auto t1 = seat->textInputV1();
     auto t2 = seat->textInputV2();
     auto t3 = seat->textInputV3();
 
     bool active = false;
     if (auto focusedSurface = seat->focusedTextInputSurface()) {
         auto client = focusedSurface->client();
         if ((t1->clientSupportsTextInput(client) && t1->isEnabled()) || (t2->clientSupportsTextInput(client) && t2->isEnabled()) || (t3->clientSupportsTextInput(client) && t3->isEnabled())) {
             active = true;
         }
     }
 
     setActive(active);
 }
 
 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);
     }
 }
 
 InputPanelV1Window *InputMethod::panel() const
 {
     return m_panel;
 }
 
 void InputMethod::setPanel(InputPanelV1Window *panel)
 {
     Q_ASSERT(panel->isInputMethod());
     if (m_panel) {
         qCWarning(KWIN_VIRTUALKEYBOARD) << "Replacing input panel" << m_panel << "with" << panel;
         disconnect(m_panel, nullptr, this, nullptr);
     }
 
     m_panel = panel;
     connect(panel, &Window::closed, this, [this]() {
         if (m_trackedWindow) {
             m_trackedWindow->setVirtualKeyboardGeometry({});
         }
     });
     connect(m_panel, &Window::frameGeometryChanged, this, &InputMethod::updateInputPanelState);
     connect(m_panel, &Window::windowHidden, this, &InputMethod::updateInputPanelState);
     connect(m_panel, &Window::closed, this, &InputMethod::updateInputPanelState);
     connect(m_panel, &Window::windowShown, this, &InputMethod::visibleChanged);
     connect(m_panel, &Window::windowHidden, this, &InputMethod::visibleChanged);
     connect(m_panel, &Window::closed, this, &InputMethod::visibleChanged);
     Q_EMIT visibleChanged();
     updateInputPanelState();
     Q_EMIT panelChanged();
 
     if (m_shouldShowPanel) {
         show();
     }
 }
 
 void InputMethod::setTrackedWindow(Window *trackedWindow)
 {
     // Reset the old window virtual keybaord geom if necessary
     // Old and new windows could be the same if focus moves between subsurfaces
     if (m_trackedWindow == trackedWindow) {
         return;
     }
     if (m_trackedWindow) {
         m_trackedWindow->setVirtualKeyboardGeometry(QRect());
         disconnect(m_trackedWindow, &Window::frameGeometryChanged, this, &InputMethod::updateInputPanelState);
     }
     m_trackedWindow = trackedWindow;
     m_shouldShowPanel = false;
     if (m_trackedWindow) {
         connect(m_trackedWindow, &Window::frameGeometryChanged, this, &InputMethod::updateInputPanelState, Qt::QueuedConnection);
     }
     updateInputPanelState();
 }
 
 void InputMethod::handleFocusedSurfaceChanged()
 {
     auto seat = waylandServer()->seat();
     SurfaceInterface *focusedSurface = seat->focusedTextInputSurface();
 
     setTrackedWindow(waylandServer()->findWindow(focusedSurface));
 
     const auto client = focusedSurface ? focusedSurface->client() : nullptr;
     bool ret = seat->textInputV2()->clientSupportsTextInput(client)
             || seat->textInputV3()->clientSupportsTextInput(client);
     if (ret != m_activeClientSupportsTextInput) {
         m_activeClientSupportsTextInput = ret;
         Q_EMIT activeClientSupportsTextInputChanged();
     }
 }
 
 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 t1 = waylandServer()->seat()->textInputV1();
     auto t2 = waylandServer()->seat()->textInputV2();
     auto t3 = waylandServer()->seat()->textInputV3();
     auto inputContext = waylandServer()->inputMethod()->context();
     if (!inputContext) {
         return;
     }
     if (t1 && t1->isEnabled()) {
         inputContext->sendContentType(t1->contentHints(), t1->contentPurpose());
     }
     if (t2 && t2->isEnabled()) {
         inputContext->sendContentType(t2->contentHints(), t2->contentPurpose());
     }
     if (t3 && t3->isEnabled()) {
         inputContext->sendContentType(t3->contentHints(), t3->contentPurpose());
     }
 }
 
 void InputMethod::textInputInterfaceV1Reset()
 {
     if (!m_enabled) {
         return;
     }
     auto t1 = waylandServer()->seat()->textInputV1();
     auto inputContext = waylandServer()->inputMethod()->context();
     if (!inputContext) {
         return;
     }
     if (!t1 || !t1->isEnabled()) {
         return;
     }
     inputContext->sendReset();
 }
 
 void InputMethod::invokeAction(quint32 button, quint32 index)
 {
     if (!m_enabled) {
         return;
     }
     auto t1 = waylandServer()->seat()->textInputV1();
     auto inputContext = waylandServer()->inputMethod()->context();
     if (!inputContext) {
         return;
     }
     if (!t1 || !t1->isEnabled()) {
         return;
     }
     inputContext->sendInvokeAction(button, index);
 }
 
 void InputMethod::textInputInterfaceV1StateUpdated(quint32 serial)
 {
     if (!m_enabled) {
         return;
     }
     auto t1 = waylandServer()->seat()->textInputV1();
     auto inputContext = waylandServer()->inputMethod()->context();
     if (!inputContext) {
         return;
     }
     if (!t1 || !t1->isEnabled()) {
         return;
     }
     inputContext->sendCommitState(serial);
 }
 
 void InputMethod::textInputInterfaceV2StateUpdated(quint32 serial, TextInputV2Interface::UpdateReason reason)
 {
     if (!m_enabled) {
         return;
     }
 
     auto t2 = waylandServer()->seat()->textInputV2();
     auto inputContext = waylandServer()->inputMethod()->context();
     if (!inputContext) {
         return;
     }
     if (!t2 || !t2->isEnabled()) {
         return;
     }
     if (m_panel && shouldShowOnActive()) {
         m_panel->allow();
     }
     switch (reason) {
     case TextInputV2Interface::UpdateReason::StateChange:
         break;
     case TextInputV2Interface::UpdateReason::StateEnter:
     case TextInputV2Interface::UpdateReason::StateFull:
         adoptInputMethodContext();
         break;
     case TextInputV2Interface::UpdateReason::StateReset:
         inputContext->sendReset();
         break;
     }
 }
 
 void InputMethod::textInputInterfaceV1EnabledChanged()
 {
     if (!m_enabled) {
         return;
     }
 
     refreshActive();
 }
 
 void InputMethod::textInputInterfaceV2EnabledChanged()
 {
     if (!m_enabled) {
         return;
     }
 
     refreshActive();
 }
 
 void InputMethod::textInputInterfaceV3EnabledChanged()
 {
     if (!m_enabled) {
         return;
     }
 
     auto t3 = waylandServer()->seat()->textInputV3();
     refreshActive();
     if (t3->isEnabled()) {
         show();
     } else {
         // 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);
     }
 }
 
 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(QStringLiteral("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)
 {
     if (auto t1 = waylandServer()->seat()->textInputV1(); t1 && t1->isEnabled()) {
         if (pressed) {
             t1->keysymPressed(time, sym, modifiers);
         } else {
             t1->keysymReleased(time, sym, modifiers);
         }
         return;
     }
 
     auto t2 = waylandServer()->seat()->textInputV2();
     if (t2 && t2->isEnabled()) {
         if (pressed) {
             t2->keysymPressed(sym, modifiers);
         } else {
             t2->keysymReleased(sym, modifiers);
         }
         return;
     }
 
     KeyboardKeyState state;
     if (pressed) {
         state = KeyboardKeyState::Pressed;
     } else {
         state = KeyboardKeyState::Released;
     }
     waylandServer()->seat()->notifyKeyboardKey(keysymToKeycode(sym), state);
 }
 
 void InputMethod::commitString(qint32 serial, const QString &text)
 {
     if (auto t1 = waylandServer()->seat()->textInputV1(); t1 && t1->isEnabled()) {
         t1->commitString(text.toUtf8());
         t1->setPreEditCursor(0);
         t1->preEdit({}, {});
         return;
     }
     if (auto t2 = waylandServer()->seat()->textInputV2(); t2 && t2->isEnabled()) {
         t2->commitString(text.toUtf8());
         t2->setPreEditCursor(0);
         t2->preEdit({}, {});
         return;
     } else if (auto t3 = waylandServer()->seat()->textInputV3(); t3 && t3->isEnabled()) {
         t3->commitString(text.toUtf8());
         t3->done();
         return;
     } else {
         // The application has no way of communicating with the input method.
         // So instead, try to convert what we get from the input method into
         // keycodes and send those as fake input to the client.
         auto keys = textToKey(text);
         if (keys.empty()) {
             return;
         }
 
         // First, send all the extracted keys as pressed keys to the client.
         for (const auto &key : keys) {
             waylandServer()->seat()->notifyKeyboardKey(key, KeyboardKeyState::Pressed);
         }
 
         // Then, send key release for those keys in reverse.
         for (auto itr = keys.rbegin(); itr != keys.rend(); ++itr) {
             // Since we are faking key events, we do not have distinct press/release
             // events. So instead, just queue the button release so it gets sent
             // a few moments after the press.
             auto key = *itr;
             QMetaObject::invokeMethod(
                 this, [key]() {
                     waylandServer()->seat()->notifyKeyboardKey(key, KeyboardKeyState::Released);
                 },
                 Qt::QueuedConnection);
         }
     }
 }
 
 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 t1 = waylandServer()->seat()->textInputV1();
     if (t1 && t1->isEnabled()) {
         t1->deleteSurroundingText(before, after);
     }
     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 t1 = waylandServer()->seat()->textInputV1();
     if (t1 && t1->isEnabled()) {
         t1->setCursorPosition(index, anchor);
     }
     auto t2 = waylandServer()->seat()->textInputV2();
     if (t2 && t2->isEnabled()) {
         t2->setCursorPosition(index, anchor);
     }
 }
 
 void InputMethod::setLanguage(uint32_t serial, const QString &language)
 {
     auto t1 = waylandServer()->seat()->textInputV1();
     if (t1 && t1->isEnabled()) {
         t1->setLanguage(language.toUtf8());
     }
     auto t2 = waylandServer()->seat()->textInputV2();
     if (t2 && t2->isEnabled()) {
         t2->setLanguage(language.toUtf8());
     }
 }
 
 void InputMethod::setTextDirection(uint32_t serial, Qt::LayoutDirection direction)
 {
     auto t1 = waylandServer()->seat()->textInputV1();
     if (t1 && t1->isEnabled()) {
         t1->setTextDirection(direction);
     }
     auto t2 = waylandServer()->seat()->textInputV2();
     if (t2 && t2->isEnabled()) {
         t2->setTextDirection(direction);
     }
 }
 
 void InputMethod::setPreeditCursor(qint32 index)
 {
     auto t1 = waylandServer()->seat()->textInputV1();
     if (t1 && t1->isEnabled()) {
         t1->setPreEditCursor(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 t1 = waylandServer()->seat()->textInputV1();
     if (t1 && t1->isEnabled()) {
         t1->preEditStyling(index, length, 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)
 {
     auto t1 = waylandServer()->seat()->textInputV1();
     if (t1 && t1->isEnabled()) {
         t1->preEdit(text.toUtf8(), commit.toUtf8());
     }
     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 ? KeyboardKeyState::Pressed : KeyboardKeyState::Released);
 }
 
 void InputMethod::modifiers(quint32 serial, quint32 mods_depressed, quint32 mods_latched, quint32 mods_locked, quint32 group)
 {
     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();
 
     TextInputV1Interface *t1 = waylandServer()->seat()->textInputV1();
     TextInputV2Interface *t2 = waylandServer()->seat()->textInputV2();
     TextInputV3Interface *t3 = waylandServer()->seat()->textInputV3();
 
     if (t1 && t1->isEnabled()) {
         inputContext->sendSurroundingText(t1->surroundingText(), t1->surroundingTextCursorPosition(), t1->surroundingTextSelectionAnchor());
         inputContext->sendPreferredLanguage(t1->preferredLanguage());
         inputContext->sendContentType(t1->contentHints(), t2->contentPurpose());
         connect(inputContext, &InputMethodContextV1Interface::language, this, &InputMethod::setLanguage);
         connect(inputContext, &InputMethodContextV1Interface::textDirection, this, &InputMethod::setTextDirection);
     } else if (t2 && t2->isEnabled()) {
         inputContext->sendSurroundingText(t2->surroundingText(), t2->surroundingTextCursorPosition(), t2->surroundingTextSelectionAnchor());
         inputContext->sendPreferredLanguage(t2->preferredLanguage());
         inputContext->sendContentType(t2->contentHints(), t2->contentPurpose());
         connect(inputContext, &InputMethodContextV1Interface::language, this, &InputMethod::setLanguage);
         connect(inputContext, &InputMethodContextV1Interface::textDirection, this, &InputMethod::setTextDirection);
     } else if (t3 && t3->isEnabled()) {
         inputContext->sendSurroundingText(t3->surroundingText(), t3->surroundingTextCursorPosition(), t3->surroundingTextSelectionAnchor());
         inputContext->sendContentType(t3->contentHints(), t3->contentPurpose());
     } else {
         // When we have neither text-input-v2 nor text-input-v3 we can only send
         // fake key events, not more complex text. So ask the input method to
         // only send basic characters without any pre-editing.
         inputContext->sendContentType(TextInputContentHint::Latin, TextInputContentPurpose::Normal);
     }
 
     inputContext->sendCommitState(m_serial++);
 
     connect(inputContext, &InputMethodContextV1Interface::keysym, this, &InputMethod::keysymReceived, Qt::UniqueConnection);
     connect(inputContext, &InputMethodContextV1Interface::key, this, &InputMethod::key, Qt::UniqueConnection);
     connect(inputContext, &InputMethodContextV1Interface::modifiers, this, &InputMethod::modifiers, Qt::UniqueConnection);
     connect(inputContext, &InputMethodContextV1Interface::commitString, this, &InputMethod::commitString, Qt::UniqueConnection);
     connect(inputContext, &InputMethodContextV1Interface::deleteSurroundingText, this, &InputMethod::deleteSurroundingText, Qt::UniqueConnection);
     connect(inputContext, &InputMethodContextV1Interface::cursorPosition, this, &InputMethod::setCursorPosition, Qt::UniqueConnection);
     connect(inputContext, &InputMethodContextV1Interface::preeditStyling, this, &InputMethod::setPreeditStyling, Qt::UniqueConnection);
     connect(inputContext, &InputMethodContextV1Interface::preeditString, this, &InputMethod::setPreeditString, Qt::UniqueConnection);
     connect(inputContext, &InputMethodContextV1Interface::preeditCursor, this, &InputMethod::setPreeditCursor, Qt::UniqueConnection);
     connect(inputContext, &InputMethodContextV1Interface::keyboardGrabRequested, this, &InputMethod::installKeyboardGrab, Qt::UniqueConnection);
     connect(inputContext, &InputMethodContextV1Interface::modifiersMap, this, &InputMethod::updateModifiersMap, Qt::UniqueConnection);
 }
 
 void InputMethod::updateInputPanelState()
 {
     if (!waylandServer()) {
         return;
     }
 
     auto t = waylandServer()->seat()->textInputV2();
 
     if (!t) {
         return;
     }
 
     if (m_panel && shouldShowOnActive()) {
         m_panel->allow();
     }
 
     QRectF overlap = QRectF(0, 0, 0, 0);
     if (m_trackedWindow) {
         const bool bottomKeyboard = m_panel && m_panel->mode() != InputPanelV1Window::Mode::Overlay && m_panel->isShown();
         m_trackedWindow->setVirtualKeyboardGeometry(bottomKeyboard ? m_panel->frameGeometry() : QRectF());
 
         if (m_panel && m_panel->mode() != InputPanelV1Window::Mode::Overlay) {
             overlap = m_trackedWindow->frameGeometry() & m_panel->frameGeometry();
             overlap.moveTo(m_trackedWindow->mapToLocal(overlap.topLeft()));
         }
     }
     t->setInputPanelState(m_panel && m_panel->isShown(), overlap.toRect());
 }
 
 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();
 }
 
 InputMethodGrabV1 *InputMethod::keyboardGrab()
 {
     return isActive() ? m_keyboardGrab : nullptr;
 }
 
 void InputMethod::installKeyboardGrab(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_panel && m_panel->isShown() && m_panel->readyForPainting();
 }
 
 bool InputMethod::isAvailable() const
 {
     return !m_inputMethodCommand.isEmpty();
 }
 
 void InputMethod::resetPendingPreedit()
 {
     preedit.text = QString();
     preedit.cursor = 0;
     preedit.highlightRanges.clear();
 }
 
 bool InputMethod::activeClientSupportsTextInput() const
 {
     return m_activeClientSupportsTextInput;
 }
 
 void InputMethod::forceActivate()
 {
     setActive(true);
     show();
 }
 
 void InputMethod::textInputInterfaceV3EnableRequested()
 {
     refreshActive();
     show();
 }
 }
 
 #include "moc_inputmethod.cpp"