Add client support for the text-input-unstable-v1 protocol

This is used by weston for forwarding virtualkeyboard related
event from keyboard applications to a Qt client.

Right now Qt only supports text-input-unstable-v2, v4 and the
special qt-input-method protocol, while weston only supports
text-input-unstable-v1.

Without this, a virtual-keyboard application can't be used
with a Qt client within weston.

Change-Id: I9a34a87100854bb0b0f76762ced56419e70c297e
Reviewed-by: Inho Lee <inho.lee@qt.io>
Reviewed-by: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@qt.io>

8 files changed, 596 insertions, 6 deletions

diff --git a/src/client/CMakeLists.txt b/src/client/CMakeLists.txt
index 7bcb65c86..1041f31e1 100644
--- a/src/client/CMakeLists.txt
+++ b/src/client/CMakeLists.txt
@@ -29,6 +29,7 @@ qt_internal_add_module(WaylandClient
         qwaylanddisplay.cpp qwaylanddisplay_p.h
         qwaylandextendedsurface.cpp qwaylandextendedsurface_p.h
         qwaylandinputcontext.cpp qwaylandinputcontext_p.h
+        qwaylandtextinputv1.cpp qwaylandtextinputv1_p.h
         qwaylandtextinputv2.cpp qwaylandtextinputv2_p.h
         qwaylandtextinputinterface.cpp qwaylandtextinputinterface_p.h
         qwaylandinputdevice.cpp qwaylandinputdevice_p.h
@@ -75,6 +76,7 @@ qt6_generate_wayland_protocol_client_sources(WaylandClient
     FILES
         ${CMAKE_CURRENT_SOURCE_DIR}/../3rdparty/protocol/pointer-gestures-unstable-v1.xml
         ${CMAKE_CURRENT_SOURCE_DIR}/../3rdparty/protocol/tablet-unstable-v2.xml
+        ${CMAKE_CURRENT_SOURCE_DIR}/../3rdparty/protocol/text-input-unstable-v1.xml
         ${CMAKE_CURRENT_SOURCE_DIR}/../3rdparty/protocol/text-input-unstable-v2.xml
         ${CMAKE_CURRENT_SOURCE_DIR}/../3rdparty/protocol/text-input-unstable-v4-wip.xml
         ${CMAKE_CURRENT_SOURCE_DIR}/../3rdparty/protocol/wayland.xml
diff --git a/src/client/qwaylanddisplay.cpp b/src/client/qwaylanddisplay.cpp
index 4e0a90b7a..5937172f0 100644
--- a/src/client/qwaylanddisplay.cpp
+++ b/src/client/qwaylanddisplay.cpp
@@ -60,6 +60,7 @@
 #include <wayland-cursor.h>
 #endif
 #include "qwaylandhardwareintegration_p.h"
+#include "qwaylandtextinputv1_p.h"
 #include "qwaylandtextinputv2_p.h"
 #if QT_WAYLAND_TEXT_INPUT_V4_WIP
 #include "qwaylandtextinputv4_p.h"
@@ -80,6 +81,7 @@
 #endif
 #include "qwaylandqtkey_p.h"
 
+#include <QtWaylandClient/private/qwayland-text-input-unstable-v1.h>
 #include <QtWaylandClient/private/qwayland-text-input-unstable-v2.h>
 #include <QtWaylandClient/private/qwayland-text-input-unstable-v4-wip.h>
 #include <QtWaylandClient/private/qwayland-wp-primary-selection-unstable-v1.h>
@@ -453,9 +455,11 @@ void QWaylandDisplay::checkTextInputProtocol()
 {
     QStringList tips, timps; // for text input protocols and text input manager protocols
     tips << QLatin1String(QtWayland::qt_text_input_method_v1::interface()->name)
-         << QLatin1String(QtWayland::zwp_text_input_v2::interface()->name);
+         << QLatin1String(QtWayland::zwp_text_input_v2::interface()->name)
+         << QLatin1String(QtWayland::zwp_text_input_v1::interface()->name);
     timps << QLatin1String(QtWayland::qt_text_input_method_manager_v1::interface()->name)
-          << QLatin1String(QtWayland::zwp_text_input_manager_v2::interface()->name);
+          << QLatin1String(QtWayland::zwp_text_input_manager_v2::interface()->name)
+          << QLatin1String(QtWayland::zwp_text_input_manager_v1::interface()->name);
 #if QT_WAYLAND_TEXT_INPUT_V4_WIP
     tips << QLatin1String(QtWayland::zwp_text_input_v4::interface()->name);
     timps << QLatin1String(QtWayland::zwp_text_input_manager_v4::interface()->name);
@@ -540,6 +544,7 @@ void QWaylandDisplay::registry_global(uint32_t id, const QString &interface, uin
             && (mTextInputManagerList.contains(interface) && mTextInputManagerList.indexOf(interface) < mTextInputManagerIndex)) {
         qCDebug(lcQpaWayland) << "text input: register qt_text_input_method_manager_v1";
         if (mTextInputManagerIndex < INT_MAX) {
+            mTextInputManagerv1.reset();
             mTextInputManagerv2.reset();
 #if QT_WAYLAND_TEXT_INPUT_V4_WIP
             mTextInputManagerv4.reset();
@@ -553,11 +558,34 @@ void QWaylandDisplay::registry_global(uint32_t id, const QString &interface, uin
             inputDevice->setTextInputMethod(new QWaylandTextInputMethod(this, mTextInputMethodManager->get_text_input_method(inputDevice->wl_seat())));
         mWaylandIntegration->reconfigureInputContext();
         mTextInputManagerIndex = mTextInputManagerList.indexOf(interface);
+    } else if (interface == QLatin1String(QtWayland::zwp_text_input_manager_v1::interface()->name)
+               && (mTextInputManagerList.contains(interface) && mTextInputManagerList.indexOf(interface) < mTextInputManagerIndex)) {
+        qCDebug(lcQpaWayland) << "text input: register zwp_text_input_v1";
+        if (mTextInputManagerIndex < INT_MAX) {
+            mTextInputMethodManager.reset();
+            mTextInputManagerv2.reset();
+#if QT_WAYLAND_TEXT_INPUT_V4_WIP
+            mTextInputManagerv4.reset();
+#endif // QT_WAYLAND_TEXT_INPUT_V4_WIP
+            for (QWaylandInputDevice *inputDevice : qAsConst(mInputDevices))
+                inputDevice->setTextInputMethod(nullptr);
+        }
+
+        mTextInputManagerv1.reset(new QtWayland::zwp_text_input_manager_v1(registry, id, 1));
+        for (QWaylandInputDevice *inputDevice : qAsConst(mInputDevices)) {
+            auto textInput = new QWaylandTextInputv1(this, mTextInputManagerv1->create_text_input());
+            textInput->setSeat(inputDevice->wl_seat());
+            inputDevice->setTextInput(textInput);
+        }
+
+        mWaylandIntegration->reconfigureInputContext();
+        mTextInputManagerIndex = mTextInputManagerList.indexOf(interface);
     } else if (interface == QLatin1String(QtWayland::zwp_text_input_manager_v2::interface()->name)
             && (mTextInputManagerList.contains(interface) && mTextInputManagerList.indexOf(interface) < mTextInputManagerIndex)) {
         qCDebug(lcQpaWayland) << "text input: register zwp_text_input_v2";
         if (mTextInputManagerIndex < INT_MAX) {
             mTextInputMethodManager.reset();
+            mTextInputManagerv1.reset();
 #if QT_WAYLAND_TEXT_INPUT_V4_WIP
             mTextInputManagerv4.reset();
 #endif // QT_WAYLAND_TEXT_INPUT_V4_WIP
@@ -633,6 +661,12 @@ void QWaylandDisplay::registry_global_remove(uint32_t id)
                     }
                 }
             }
+            if (global.interface == QLatin1String(QtWayland::zwp_text_input_manager_v1::interface()->name)) {
+                mTextInputManagerv1.reset();
+                for (QWaylandInputDevice *inputDevice : qAsConst(mInputDevices))
+                    inputDevice->setTextInput(nullptr);
+                mWaylandIntegration->reconfigureInputContext();
+            }
             if (global.interface == QLatin1String(QtWayland::zwp_text_input_manager_v2::interface()->name)) {
                 mTextInputManagerv2.reset();
                 for (QWaylandInputDevice *inputDevice : qAsConst(mInputDevices))
diff --git a/src/client/qwaylanddisplay_p.h b/src/client/qwaylanddisplay_p.h
index 8d8000d2a..cf123cba3 100644
--- a/src/client/qwaylanddisplay_p.h
+++ b/src/client/qwaylanddisplay_p.h
@@ -82,6 +82,7 @@ class QPlatformPlaceholderScreen;
 
 namespace QtWayland {
     class qt_surface_extension;
+    class zwp_text_input_manager_v1;
     class zwp_text_input_manager_v2;
     class zwp_text_input_manager_v4;
     class qt_text_input_method_manager_v1;
@@ -176,6 +177,7 @@ public:
     QWaylandPointerGestures *pointerGestures() const { return mPointerGestures.data(); }
     QWaylandTouchExtension *touchExtension() const { return mTouchExtension.data(); }
     QtWayland::qt_text_input_method_manager_v1 *textInputMethodManager() const { return mTextInputMethodManager.data(); }
+    QtWayland::zwp_text_input_manager_v1 *textInputManagerv1() const { return mTextInputManagerv1.data(); }
     QtWayland::zwp_text_input_manager_v2 *textInputManagerv2() const { return mTextInputManagerv2.data(); }
     QtWayland::zwp_text_input_manager_v4 *textInputManagerv4() const { return mTextInputManagerv4.data(); }
     QWaylandHardwareIntegration *hardwareIntegration() const { return mHardwareIntegration.data(); }
@@ -289,6 +291,7 @@ private:
     QScopedPointer<QWaylandPrimarySelectionDeviceManagerV1> mPrimarySelectionManager;
 #endif
     QScopedPointer<QtWayland::qt_text_input_method_manager_v1> mTextInputMethodManager;
+    QScopedPointer<QtWayland::zwp_text_input_manager_v1> mTextInputManagerv1;
     QScopedPointer<QtWayland::zwp_text_input_manager_v2> mTextInputManagerv2;
     QScopedPointer<QtWayland::zwp_text_input_manager_v4> mTextInputManagerv4;
     QScopedPointer<QWaylandHardwareIntegration> mHardwareIntegration;
diff --git a/src/client/qwaylandinputcontext.cpp b/src/client/qwaylandinputcontext.cpp
index c59485277..32433cdc0 100644
--- a/src/client/qwaylandinputcontext.cpp
+++ b/src/client/qwaylandinputcontext.cpp
@@ -71,9 +71,9 @@ QWaylandInputContext::~QWaylandInputContext()
 bool QWaylandInputContext::isValid() const
 {
 #if QT_WAYLAND_TEXT_INPUT_V4_WIP
-    return mDisplay->textInputManagerv2() != nullptr || mDisplay->textInputManagerv4() != nullptr;
+    return mDisplay->textInputManagerv2() != nullptr || mDisplay->textInputManagerv1() != nullptr || mDisplay->textInputManagerv4() != nullptr;
 #else //  QT_WAYLAND_TEXT_INPUT_V4_WIP
-    return mDisplay->textInputManagerv2() != nullptr;
+    return mDisplay->textInputManagerv2() != nullptr || mDisplay->textInputManagerv1() != nullptr;
 #endif // QT_WAYLAND_TEXT_INPUT_V4_WIP
 }
 
diff --git a/src/client/qwaylandinputdevice.cpp b/src/client/qwaylandinputdevice.cpp
index 4c32a534d..34ca328a6 100644
--- a/src/client/qwaylandinputdevice.cpp
+++ b/src/client/qwaylandinputdevice.cpp
@@ -59,6 +59,7 @@
 #include "qwaylandcursor_p.h"
 #include "qwaylanddisplay_p.h"
 #include "qwaylandshmbackingstore_p.h"
+#include "qwaylandtextinputv1_p.h"
 #include "qwaylandtextinputv2_p.h"
 #if QT_WAYLAND_TEXT_INPUT_V4_WIP
 #include "qwaylandtextinputv4_p.h"
@@ -426,6 +427,12 @@ QWaylandInputDevice::QWaylandInputDevice(QWaylandDisplay *display, int version,
         setPrimarySelectionDevice(psm->createDevice(this));
 #endif
 
+    if (mQDisplay->textInputManagerv1()) {
+        auto textInput = new QWaylandTextInputv1(mQDisplay, mQDisplay->textInputManagerv1()->create_text_input());
+        textInput->setSeat(wl_seat());
+        mTextInput.reset(textInput);
+    }
+
     if (mQDisplay->textInputManagerv2())
         mTextInput.reset(new QWaylandTextInputv2(mQDisplay, mQDisplay->textInputManagerv2()->get_text_input(wl_seat())));
 
diff --git a/src/client/qwaylandintegration.cpp b/src/client/qwaylandintegration.cpp
index 274ae9a9d..721af8347 100644
--- a/src/client/qwaylandintegration.cpp
+++ b/src/client/qwaylandintegration.cpp
@@ -514,9 +514,9 @@ void QWaylandIntegration::reconfigureInputContext()
         if (mDisplay->textInputMethodManager() != nullptr)
             mInputContext.reset(new QWaylandInputMethodContext(mDisplay.data()));
 #if QT_WAYLAND_TEXT_INPUT_V4_WIP
-        else if (mDisplay->textInputManagerv2() != nullptr || mDisplay->textInputManagerv4() != nullptr)
+        else if (mDisplay->textInputManagerv1() != nullptr || mDisplay->textInputManagerv2() != nullptr || mDisplay->textInputManagerv4() != nullptr)
 #else //  QT_WAYLAND_TEXT_INPUT_V4_WIP
-        else if (mDisplay->textInputManagerv2() != nullptr)
+        else if (mDisplay->textInputManagerv1() != nullptr || mDisplay->textInputManagerv2() != nullptr)
 #endif // QT_WAYLAND_TEXT_INPUT_V4_WIP
             mInputContext.reset(new QWaylandInputContext(mDisplay.data()));
     } else {
diff --git a/src/client/qwaylandtextinputv1.cpp b/src/client/qwaylandtextinputv1.cpp
new file mode 100644
index 000000000..5e204a7ff
--- /dev/null
+++ b/src/client/qwaylandtextinputv1.cpp
@@ -0,0 +1,395 @@
+/****************************************************************************
+**
+** Copyright (C) 2021 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the QtWaylandClient module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or (at your option) the GNU General
+** Public license version 3 or any later version approved by the KDE Free
+** Qt Foundation. The licenses are as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-2.0.html and
+** https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+#include <qpa/qplatforminputcontext.h>
+
+#include "qwaylandtextinputv1_p.h"
+
+#include "qwaylandwindow_p.h"
+#include "qwaylandinputmethodeventbuilder_p.h"
+
+#include <QtCore/qloggingcategory.h>
+#include <QtGui/QGuiApplication>
+#include <QtGui/private/qguiapplication_p.h>
+#include <QtGui/qpa/qplatformintegration.h>
+#include <QtGui/qevent.h>
+#include <QtGui/qwindow.h>
+#include <QTextCharFormat>
+#include <QList>
+#include <QRectF>
+#include <QLocale>
+
+QT_BEGIN_NAMESPACE
+
+Q_DECLARE_LOGGING_CATEGORY(qLcQpaInputMethods)
+
+namespace QtWaylandClient {
+
+namespace {
+
+const Qt::InputMethodQueries supportedQueries = Qt::ImEnabled |
+                                                Qt::ImSurroundingText |
+                                                Qt::ImCursorPosition |
+                                                Qt::ImAnchorPosition |
+                                                Qt::ImHints |
+                                                Qt::ImCursorRectangle |
+                                                Qt::ImPreferredLanguage;
+}
+
+QWaylandTextInputv1::QWaylandTextInputv1(QWaylandDisplay *display, struct ::zwp_text_input_v1 *text_input)
+    : QtWayland::zwp_text_input_v1(text_input)
+    , m_display(display)
+{
+}
+
+QWaylandTextInputv1::~QWaylandTextInputv1()
+{
+    if (m_resetCallback)
+        wl_callback_destroy(m_resetCallback);
+}
+
+void QWaylandTextInputv1::reset()
+{
+    m_builder.reset();
+    m_preeditCommit = QString();
+    updateState(Qt::ImQueryAll, QWaylandTextInputInterface::update_state_reset);
+}
+
+void QWaylandTextInputv1::commit()
+{
+    if (QObject *o = QGuiApplication::focusObject()) {
+        QInputMethodEvent event;
+        event.setCommitString(m_preeditCommit);
+        QCoreApplication::sendEvent(o, &event);
+    }
+
+    reset();
+}
+
+const wl_callback_listener QWaylandTextInputv1::callbackListener = {
+    QWaylandTextInputv1::resetCallback
+};
+
+void QWaylandTextInputv1::resetCallback(void *data, wl_callback *, uint32_t)
+{
+    QWaylandTextInputv1 *self = static_cast<QWaylandTextInputv1*>(data);
+
+    if (self->m_resetCallback) {
+        wl_callback_destroy(self->m_resetCallback);
+        self->m_resetCallback = nullptr;
+    }
+}
+
+void QWaylandTextInputv1::updateState(Qt::InputMethodQueries queries, uint32_t flags)
+{
+    if (!QGuiApplication::focusObject())
+        return;
+
+    if (!QGuiApplication::focusWindow() || !QGuiApplication::focusWindow()->handle())
+        return;
+
+    auto *window = static_cast<QWaylandWindow *>(QGuiApplication::focusWindow()->handle());
+    auto *surface = window->wlSurface();
+    if (!surface || (surface != m_surface))
+        return;
+
+    queries &= supportedQueries;
+
+    // Surrounding text, cursor and anchor positions are transferred together
+    if ((queries & Qt::ImSurroundingText) || (queries & Qt::ImCursorPosition) || (queries & Qt::ImAnchorPosition))
+        queries |= Qt::ImSurroundingText | Qt::ImCursorPosition | Qt::ImAnchorPosition;
+
+    QInputMethodQueryEvent event(queries);
+    QCoreApplication::sendEvent(QGuiApplication::focusObject(), &event);
+
+    if ((queries & Qt::ImSurroundingText) || (queries & Qt::ImCursorPosition) || (queries & Qt::ImAnchorPosition)) {
+        QString text = event.value(Qt::ImSurroundingText).toString();
+        int cursor = event.value(Qt::ImCursorPosition).toInt();
+        int anchor = event.value(Qt::ImAnchorPosition).toInt();
+
+        // Make sure text is not too big
+        if (text.toUtf8().size() > 2048) {
+            int c = qAbs(cursor - anchor) <= 512 ? qMin(cursor, anchor) + qAbs(cursor - anchor) / 2: cursor;
+
+            const int offset = c - qBound(0, c, 512 - qMin(text.size() - c, 256));
+            text = text.mid(offset + c - 256, 512);
+            cursor -= offset;
+            anchor -= offset;
+        }
+
+        set_surrounding_text(text, QWaylandInputMethodEventBuilder::indexToWayland(text, cursor), QWaylandInputMethodEventBuilder::indexToWayland(text, anchor));
+    }
+
+    if (queries & Qt::ImHints) {
+        QWaylandInputMethodContentType contentType = QWaylandInputMethodContentType::convert(static_cast<Qt::InputMethodHints>(event.value(Qt::ImHints).toInt()));
+        set_content_type(contentType.hint, contentType.purpose);
+    }
+
+    if (queries & Qt::ImCursorRectangle) {
+        const QRect &cRect = event.value(Qt::ImCursorRectangle).toRect();
+        const QRect &windowRect = QGuiApplication::inputMethod()->inputItemTransform().mapRect(cRect);
+        const QMargins margins = window->frameMargins();
+        const QRect &surfaceRect = windowRect.translated(margins.left(), margins.top());
+        set_cursor_rectangle(surfaceRect.x(), surfaceRect.y(), surfaceRect.width(), surfaceRect.height());
+    }
+
+    if (queries & Qt::ImPreferredLanguage) {
+        const QString &language = event.value(Qt::ImPreferredLanguage).toString();
+        set_preferred_language(language);
+    }
+
+    if (flags == QWaylandTextInputInterface::update_state_reset)
+        QtWayland::zwp_text_input_v1::reset();
+    else
+        commit_state(m_serial);
+}
+
+void QWaylandTextInputv1::setCursorInsidePreedit(int)
+{
+    // Not supported yet
+}
+
+bool QWaylandTextInputv1::isInputPanelVisible() const
+{
+    return m_inputPanelVisible;
+}
+
+QRectF QWaylandTextInputv1::keyboardRect() const
+{
+    return m_keyboardRectangle;
+}
+
+QLocale QWaylandTextInputv1::locale() const
+{
+    return m_locale;
+}
+
+Qt::LayoutDirection QWaylandTextInputv1::inputDirection() const
+{
+    return m_inputDirection;
+}
+
+void QWaylandTextInputv1::zwp_text_input_v1_enter(::wl_surface *surface)
+{
+    m_surface = surface;
+
+    updateState(Qt::ImQueryAll, QWaylandTextInputInterface::update_state_reset);
+}
+
+void QWaylandTextInputv1::zwp_text_input_v1_leave()
+{
+    m_surface = nullptr;
+}
+
+void QWaylandTextInputv1::zwp_text_input_v1_modifiers_map(wl_array *map)
+{
+    const QList<QByteArray> modifiersMap = QByteArray::fromRawData(static_cast<const char*>(map->data), map->size).split('\0');
+
+    m_modifiersMap.clear();
+
+    for (const QByteArray &modifier : modifiersMap) {
+        if (modifier == "Shift")
+            m_modifiersMap.append(Qt::ShiftModifier);
+        else if (modifier == "Control")
+            m_modifiersMap.append(Qt::ControlModifier);
+        else if (modifier == "Alt")
+            m_modifiersMap.append(Qt::AltModifier);
+        else if (modifier == "Mod1")
+            m_modifiersMap.append(Qt::AltModifier);
+        else if (modifier == "Mod4")
+            m_modifiersMap.append(Qt::MetaModifier);
+        else
+            m_modifiersMap.append(Qt::NoModifier);
+    }
+}
+
+void QWaylandTextInputv1::zwp_text_input_v1_input_panel_state(uint32_t visible)
+{
+    const bool inputPanelVisible = (visible == 1);
+    if (m_inputPanelVisible != inputPanelVisible) {
+        m_inputPanelVisible = inputPanelVisible;
+        QGuiApplicationPrivate::platformIntegration()->inputContext()->emitInputPanelVisibleChanged();
+    }
+}
+
+void QWaylandTextInputv1::zwp_text_input_v1_preedit_string(uint32_t serial, const QString &text, const QString &commit)
+{
+    m_serial = serial;
+
+    if (m_resetCallback) {
+        qCDebug(qLcQpaInputMethods()) << "discard preedit_string: reset not confirmed";
+        m_builder.reset();
+        return;
+    }
+
+    if (!QGuiApplication::focusObject())
+        return;
+
+    QInputMethodEvent *event = m_builder.buildPreedit(text);
+
+    m_builder.reset();
+    m_preeditCommit = commit;
+
+    QCoreApplication::sendEvent(QGuiApplication::focusObject(), event);
+    delete event;
+}
+
+void QWaylandTextInputv1::zwp_text_input_v1_preedit_styling(uint32_t index, uint32_t length, uint32_t style)
+{
+    m_builder.addPreeditStyling(index, length, style);
+}
+
+void QWaylandTextInputv1::zwp_text_input_v1_preedit_cursor(int32_t index)
+{
+    m_builder.setPreeditCursor(index);
+}
+
+void QWaylandTextInputv1::zwp_text_input_v1_commit_string(uint32_t serial, const QString &text)
+{
+    m_serial = serial;
+
+    if (m_resetCallback) {
+        qCDebug(qLcQpaInputMethods()) << "discard commit_string: reset not confirmed";
+        m_builder.reset();
+        return;
+    }
+
+    if (!QGuiApplication::focusObject())
+        return;
+
+    // When committing the text, the preeditString needs to be reset, to prevent it to be
+    // send again in the commit() function
+    m_preeditCommit.clear();
+
+    QInputMethodEvent *event = m_builder.buildCommit(text);
+
+    m_builder.reset();
+
+    QCoreApplication::sendEvent(QGuiApplication::focusObject(), event);
+    delete event;
+}
+
+void QWaylandTextInputv1::zwp_text_input_v1_cursor_position(int32_t index, int32_t anchor)
+{
+    m_builder.setCursorPosition(index, anchor);
+}
+
+void QWaylandTextInputv1::zwp_text_input_v1_delete_surrounding_text(int32_t before_length, uint32_t after_length)
+{
+    //before_length is negative, but the builder expects it to be positive
+    m_builder.setDeleteSurroundingText(-before_length, after_length);
+}
+
+void QWaylandTextInputv1::zwp_text_input_v1_keysym(uint32_t serial, uint32_t time, uint32_t sym, uint32_t state, uint32_t modifiers)
+{
+    m_serial = serial;
+
+#if QT_CONFIG(xkbcommon)
+    if (m_resetCallback) {
+        qCDebug(qLcQpaInputMethods()) << "discard keysym: reset not confirmed";
+        return;
+    }
+
+    if (!QGuiApplication::focusWindow())
+        return;
+
+    Qt::KeyboardModifiers qtModifiers = modifiersToQtModifiers(modifiers);
+
+    QEvent::Type type = state == WL_KEYBOARD_KEY_STATE_PRESSED ? QEvent::KeyPress : QEvent::KeyRelease;
+    QString text = QXkbCommon::lookupStringNoKeysymTransformations(sym);
+    int qtkey = QXkbCommon::keysymToQtKey(sym, qtModifiers);
+
+    QWindowSystemInterface::handleKeyEvent(QGuiApplication::focusWindow(),
+                                           time, type, qtkey, qtModifiers, text);
+#else
+    Q_UNUSED(time);
+    Q_UNUSED(sym);
+    Q_UNUSED(state);
+    Q_UNUSED(modifiers);
+#endif
+}
+
+void QWaylandTextInputv1::zwp_text_input_v1_language(uint32_t serial, const QString &language)
+{
+    m_serial = serial;
+
+    if (m_resetCallback) {
+        qCDebug(qLcQpaInputMethods()) << "discard language: reset not confirmed";
+        return;
+    }
+
+    const QLocale locale(language);
+    if (m_locale != locale) {
+        m_locale = locale;
+        QGuiApplicationPrivate::platformIntegration()->inputContext()->emitLocaleChanged();
+    }
+}
+
+void QWaylandTextInputv1::zwp_text_input_v1_text_direction(uint32_t serial, uint32_t direction)
+{
+    m_serial = serial;
+
+    if (m_resetCallback) {
+        qCDebug(qLcQpaInputMethods()) << "discard text_direction: reset not confirmed";
+        return;
+    }
+
+    const Qt::LayoutDirection inputDirection = (direction == text_direction_auto) ? Qt::LayoutDirectionAuto :
+                                               (direction == text_direction_ltr) ? Qt::LeftToRight :
+                                               (direction == text_direction_rtl) ? Qt::RightToLeft : Qt::LayoutDirectionAuto;
+    if (m_inputDirection != inputDirection) {
+        m_inputDirection = inputDirection;
+        QGuiApplicationPrivate::platformIntegration()->inputContext()->emitInputDirectionChanged(m_inputDirection);
+    }
+}
+
+Qt::KeyboardModifiers QWaylandTextInputv1::modifiersToQtModifiers(uint32_t modifiers)
+{
+    Qt::KeyboardModifiers ret = Qt::NoModifier;
+    for (int i = 0; i < m_modifiersMap.size(); ++i) {
+        if (modifiers & (1 << i)) {
+            ret |= m_modifiersMap[i];
+        }
+    }
+    return ret;
+}
+
+}
+
+QT_END_NAMESPACE
+
diff --git a/src/client/qwaylandtextinputv1_p.h b/src/client/qwaylandtextinputv1_p.h
new file mode 100644
index 000000000..238db0b8a
--- /dev/null
+++ b/src/client/qwaylandtextinputv1_p.h
@@ -0,0 +1,149 @@
+/****************************************************************************
+**
+** Copyright (C) 2021 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the QtWaylandClient module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or (at your option) the GNU General
+** Public license version 3 or any later version approved by the KDE Free
+** Qt Foundation. The licenses are as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-2.0.html and
+** https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+
+#ifndef QWAYLANDTEXTINPUTV1_H
+#define QWAYLANDTEXTINPUTV1_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists purely as an
+// implementation detail.  This header file may change from version to
+// version without notice, or even be removed.
+//
+// We mean it.
+//
+
+#include "qwaylandtextinputinterface_p.h"
+#include <QtWaylandClient/private/qwayland-text-input-unstable-v1.h>
+#include <qwaylandinputmethodeventbuilder_p.h>
+
+struct wl_callback;
+struct wl_callback_listener;
+
+QT_BEGIN_NAMESPACE
+
+namespace QtWaylandClient {
+
+class QWaylandDisplay;
+
+class QWaylandTextInputv1 : public QtWayland::zwp_text_input_v1, public QWaylandTextInputInterface
+{
+public:
+    QWaylandTextInputv1(QWaylandDisplay *display, struct ::zwp_text_input_v1 *text_input);
+    ~QWaylandTextInputv1() override;
+
+    void setSeat(struct ::wl_seat *seat) { m_seat = seat; }
+
+    void reset() override;
+    void commit() override;
+    void updateState(Qt::InputMethodQueries queries, uint32_t flags) override;
+
+    void setCursorInsidePreedit(int cursor) override;
+
+    bool isInputPanelVisible() const override;
+    QRectF keyboardRect() const override;
+
+    QLocale locale() const override;
+    Qt::LayoutDirection inputDirection() const override;
+
+    void showInputPanel() override
+    {
+        show_input_panel();
+    }
+    void hideInputPanel() override
+    {
+        hide_input_panel();
+    }
+    void enableSurface(::wl_surface *surface) override
+    {
+        activate(m_seat, surface);
+    }
+    void disableSurface(::wl_surface *surface) override
+    {
+        Q_UNUSED(surface);
+        deactivate(m_seat);
+    }
+
+protected:
+    void zwp_text_input_v1_enter(struct ::wl_surface *surface) override;
+    void zwp_text_input_v1_leave() override;
+    void zwp_text_input_v1_modifiers_map(wl_array *map) override;
+    void zwp_text_input_v1_input_panel_state(uint32_t state) override;
+    void zwp_text_input_v1_preedit_string(uint32_t serial, const QString &text, const QString &commit) override;
+    void zwp_text_input_v1_preedit_styling(uint32_t index, uint32_t length, uint32_t style) override;
+    void zwp_text_input_v1_preedit_cursor(int32_t index) override;
+    void zwp_text_input_v1_commit_string(uint32_t serial, const QString &text) override;
+    void zwp_text_input_v1_cursor_position(int32_t index, int32_t anchor) override;
+    void zwp_text_input_v1_delete_surrounding_text(int32_t before_length, uint32_t after_length) override;
+    void zwp_text_input_v1_keysym(uint32_t serial, uint32_t time, uint32_t sym, uint32_t state, uint32_t modifiers) override;
+    void zwp_text_input_v1_language(uint32_t serial, const QString &language) override;
+    void zwp_text_input_v1_text_direction(uint32_t serial, uint32_t direction) override;
+
+private:
+    Qt::KeyboardModifiers modifiersToQtModifiers(uint32_t modifiers);
+
+    QWaylandDisplay *m_display = nullptr;
+    QWaylandInputMethodEventBuilder m_builder;
+
+    QList<Qt::KeyboardModifier> m_modifiersMap;
+
+    uint32_t m_serial = 0;
+    struct ::wl_surface *m_surface = nullptr;
+    struct ::wl_seat *m_seat = nullptr;
+
+    QString m_preeditCommit;
+
+    bool m_inputPanelVisible = false;
+    QRectF m_keyboardRectangle;
+    QLocale m_locale;
+    Qt::LayoutDirection m_inputDirection = Qt::LayoutDirectionAuto;
+
+    struct ::wl_callback *m_resetCallback = nullptr;
+    static const wl_callback_listener callbackListener;
+    static void resetCallback(void *data, struct wl_callback *wl_callback, uint32_t time);
+};
+
+}
+
+QT_END_NAMESPACE
+#endif // QWAYLANDTEXTINPUTV1_H
+