Client: Implement primary-selection-unstable-v1

[ChangeLog][QPA plugin] Added support for middle mouse pasting through the
primary-selection-unstable-v1 protocol.

Fixes: QTBUG-66008
Change-Id: I7c8fb9aa2c856f5b6794aeab1ee75d80cad05dcd
Reviewed-by: Paul Olav Tvete <paul.tvete@qt.io>

11 files changed, 461 insertions, 33 deletions

diff --git a/src/client/client.pro b/src/client/client.pro
index ff9e845f1..4f4c58328 100644
--- a/src/client/client.pro
+++ b/src/client/client.pro
@@ -31,6 +31,7 @@ WAYLANDCLIENTSOURCES += \
             ../extensions/touch-extension.xml \
             ../extensions/qt-key-unstable-v1.xml \
             ../extensions/qt-windowmanager.xml \
+            ../3rdparty/protocol/wp-primary-selection-unstable-v1.xml \
             ../3rdparty/protocol/text-input-unstable-v2.xml \
             ../3rdparty/protocol/xdg-output-unstable-v1.xml \
             ../3rdparty/protocol/wayland.xml
@@ -118,6 +119,11 @@ qtConfig(wayland-datadevice) {
         qwaylanddatasource.cpp
 }
 
+qtConfig(wayland-client-primary-selection) {
+    HEADERS += qwaylandprimaryselectionv1_p.h
+    SOURCES += qwaylandprimaryselectionv1.cpp
+}
+
 qtConfig(draganddrop) {
     HEADERS += \
         qwaylanddnd_p.h
diff --git a/src/client/configure.json b/src/client/configure.json
index 2ec87eb49..403a2edcf 100644
--- a/src/client/configure.json
+++ b/src/client/configure.json
@@ -93,6 +93,11 @@
             "condition": "features.draganddrop || features.clipboard",
             "output": [ "privateFeature" ]
         },
+        "wayland-client-primary-selection": {
+            "label": "primary-selection clipboard",
+            "condition": "features.clipboard",
+            "output": [ "privateFeature" ]
+        },
         "wayland-client-fullscreen-shell-v1": {
             "label": "fullscreen-shell-v1",
             "condition": "features.wayland-client",
diff --git a/src/client/qwaylandclipboard.cpp b/src/client/qwaylandclipboard.cpp
index 60820da92..369c6ec07 100644
--- a/src/client/qwaylandclipboard.cpp
+++ b/src/client/qwaylandclipboard.cpp
@@ -43,6 +43,9 @@
 #include "qwaylanddataoffer_p.h"
 #include "qwaylanddatasource_p.h"
 #include "qwaylanddatadevice_p.h"
+#if QT_CONFIG(wayland_client_primary_selection)
+#include "qwaylandprimaryselectionv1_p.h"
+#endif
 
 QT_BEGIN_NAMESPACE
 
@@ -59,44 +62,74 @@ QWaylandClipboard::~QWaylandClipboard()
 
 QMimeData *QWaylandClipboard::mimeData(QClipboard::Mode mode)
 {
-    if (mode != QClipboard::Clipboard)
+    auto *seat = mDisplay->currentInputDevice();
+    if (!seat)
         return &m_emptyData;
 
-    QWaylandInputDevice *inputDevice = mDisplay->currentInputDevice();
-    if (!inputDevice || !inputDevice->dataDevice())
+    switch (mode) {
+    case QClipboard::Clipboard:
+        if (auto *dataDevice = seat->dataDevice()) {
+            if (auto *source = dataDevice->selectionSource())
+                return source->mimeData();
+            if (auto *offer = dataDevice->selectionOffer())
+                return offer->mimeData();
+        }
+        return &m_emptyData;
+    case QClipboard::Selection:
+#if QT_CONFIG(wayland_client_primary_selection)
+        if (auto *selectionDevice = seat->primarySelectionDevice()) {
+            if (auto *source = selectionDevice->selectionSource())
+                return source->mimeData();
+            if (auto *offer = selectionDevice->selectionOffer())
+                return offer->mimeData();
+        }
+#endif
+        return &m_emptyData;
+    default:
         return &m_emptyData;
-
-    QWaylandDataSource *source = inputDevice->dataDevice()->selectionSource();
-    if (source) {
-        return source->mimeData();
     }
-
-    if (inputDevice->dataDevice()->selectionOffer())
-        return inputDevice->dataDevice()->selectionOffer()->mimeData();
-
-    return &m_emptyData;
 }
 
 void QWaylandClipboard::setMimeData(QMimeData *data, QClipboard::Mode mode)
 {
-    if (mode != QClipboard::Clipboard)
-        return;
-
-    QWaylandInputDevice *inputDevice = mDisplay->currentInputDevice();
-    if (!inputDevice || !inputDevice->dataDevice())
+    auto *seat = mDisplay->currentInputDevice();
+    if (!seat)
         return;
 
     static const QString plain = QStringLiteral("text/plain");
     static const QString utf8 = QStringLiteral("text/plain;charset=utf-8");
+
     if (data && data->hasFormat(plain) && !data->hasFormat(utf8))
         data->setData(utf8, data->data(plain));
-    inputDevice->dataDevice()->setSelectionSource(data ? new QWaylandDataSource(mDisplay->dndSelectionHandler(), data) : nullptr);
 
-    emitChanged(mode);
+    switch (mode) {
+    case QClipboard::Clipboard:
+        if (auto *dataDevice = seat->dataDevice()) {
+            dataDevice->setSelectionSource(data ? new QWaylandDataSource(mDisplay->dndSelectionHandler(), data) : nullptr);
+            emitChanged(mode);
+        }
+        break;
+    case QClipboard::Selection:
+#if QT_CONFIG(wayland_client_primary_selection)
+        if (auto *selectionDevice = seat->primarySelectionDevice()) {
+            selectionDevice->setSelectionSource(data ? new QWaylandPrimarySelectionSourceV1(mDisplay->primarySelectionManager(), data) : nullptr);
+            emitChanged(mode);
+        }
+#endif
+        break;
+    default:
+        break;
+    }
 }
 
 bool QWaylandClipboard::supportsMode(QClipboard::Mode mode) const
 {
+#if QT_CONFIG(wayland_client_primary_selection)
+    if (mode == QClipboard::Selection) {
+        auto *seat = mDisplay->currentInputDevice();
+        return seat && seat->primarySelectionDevice();
+    }
+#endif
     return mode == QClipboard::Clipboard;
 }
 
diff --git a/src/client/qwaylanddataoffer.cpp b/src/client/qwaylanddataoffer.cpp
index 0c732c020..e31e1220f 100644
--- a/src/client/qwaylanddataoffer.cpp
+++ b/src/client/qwaylanddataoffer.cpp
@@ -58,7 +58,8 @@ static QString utf8Text()
 
 QWaylandDataOffer::QWaylandDataOffer(QWaylandDisplay *display, struct ::wl_data_offer *offer)
     : QtWayland::wl_data_offer(offer)
-    , m_mimeData(new QWaylandMimeData(this, display))
+    , m_display(display)
+    , m_mimeData(new QWaylandMimeData(this))
 {
 }
 
@@ -81,14 +82,19 @@ QMimeData *QWaylandDataOffer::mimeData()
     return m_mimeData.data();
 }
 
+void QWaylandDataOffer::startReceiving(const QString &mimeType, int fd)
+{
+    receive(mimeType, fd);
+    wl_display_flush(m_display->wl_display());
+}
+
 void QWaylandDataOffer::data_offer_offer(const QString &mime_type)
 {
     m_mimeData->appendFormat(mime_type);
 }
 
-QWaylandMimeData::QWaylandMimeData(QWaylandDataOffer *dataOffer, QWaylandDisplay *display)
+QWaylandMimeData::QWaylandMimeData(QWaylandAbstractDataOffer *dataOffer)
     : m_dataOffer(dataOffer)
-    , m_display(display)
 {
 }
 
@@ -140,8 +146,7 @@ QVariant QWaylandMimeData::retrieveData_sys(const QString &mimeType, QVariant::T
         return QVariant();
     }
 
-    m_dataOffer->receive(mime, pipefd[1]);
-    wl_display_flush(m_display->wl_display());
+    m_dataOffer->startReceiving(mime, pipefd[1]);
 
     close(pipefd[1]);
 
diff --git a/src/client/qwaylanddataoffer_p.h b/src/client/qwaylanddataoffer_p.h
index 5412400a5..9cf1483ca 100644
--- a/src/client/qwaylanddataoffer_p.h
+++ b/src/client/qwaylanddataoffer_p.h
@@ -65,27 +65,40 @@ namespace QtWaylandClient {
 class QWaylandDisplay;
 class QWaylandMimeData;
 
-class Q_WAYLAND_CLIENT_EXPORT QWaylandDataOffer : public QtWayland::wl_data_offer
+class QWaylandAbstractDataOffer
+{
+public:
+    virtual void startReceiving(const QString &mimeType, int fd) = 0;
+    virtual QMimeData *mimeData() = 0;
+
+    virtual ~QWaylandAbstractDataOffer() = default;
+};
+
+class Q_WAYLAND_CLIENT_EXPORT QWaylandDataOffer
+        : public QtWayland::wl_data_offer // needs to be the first because we do static casts from the user pointer to the wrapper
+        , public QWaylandAbstractDataOffer
 {
 public:
     explicit QWaylandDataOffer(QWaylandDisplay *display, struct ::wl_data_offer *offer);
     ~QWaylandDataOffer() override;
+    QMimeData *mimeData() override;
 
     QString firstFormat() const;
 
-    QMimeData *mimeData();
+    void startReceiving(const QString &mimeType, int fd) override;
 
 protected:
     void data_offer_offer(const QString &mime_type) override;
 
 private:
+    QWaylandDisplay *m_display = nullptr;
     QScopedPointer<QWaylandMimeData> m_mimeData;
 };
 
 
 class QWaylandMimeData : public QInternalMimeData {
 public:
-    explicit QWaylandMimeData(QWaylandDataOffer *dataOffer, QWaylandDisplay *display);
+    explicit QWaylandMimeData(QWaylandAbstractDataOffer *dataOffer);
     ~QWaylandMimeData() override;
 
     void appendFormat(const QString &mimeType);
@@ -98,13 +111,12 @@ protected:
 private:
     int readData(int fd, QByteArray &data) const;
 
-    mutable QWaylandDataOffer *m_dataOffer = nullptr;
-    QWaylandDisplay *m_display = nullptr;
+    QWaylandAbstractDataOffer *m_dataOffer = nullptr;
     mutable QStringList m_types;
     mutable QHash<QString, QByteArray> m_data;
 };
 
-}
+} // namespace QtWaylandClient
 
 QT_END_NAMESPACE
 #endif
diff --git a/src/client/qwaylanddisplay.cpp b/src/client/qwaylanddisplay.cpp
index 7c32b6bf5..1febca9b1 100644
--- a/src/client/qwaylanddisplay.cpp
+++ b/src/client/qwaylanddisplay.cpp
@@ -52,7 +52,10 @@
 #if QT_CONFIG(wayland_datadevice)
 #include "qwaylanddatadevicemanager_p.h"
 #include "qwaylanddatadevice_p.h"
-#endif
+#endif // QT_CONFIG(wayland_datadevice)
+#if QT_CONFIG(wayland_client_primary_selection)
+#include "qwaylandprimaryselectionv1_p.h"
+#endif // QT_CONFIG(wayland_client_primary_selection)
 #if QT_CONFIG(cursor)
 #include <wayland-cursor.h>
 #endif
@@ -69,6 +72,7 @@
 #include "qwaylandqtkey_p.h"
 
 #include <QtWaylandClient/private/qwayland-text-input-unstable-v2.h>
+#include <QtWaylandClient/private/qwayland-wp-primary-selection-unstable-v1.h>
 
 #include <QtCore/private/qcore_unix_p.h>
 
@@ -318,6 +322,10 @@ void QWaylandDisplay::registry_global(uint32_t id, const QString &interface, uin
         mTouchExtension.reset(new QWaylandTouchExtension(this, id));
     } else if (interface == QStringLiteral("zqt_key_v1")) {
         mQtKeyExtension.reset(new QWaylandQtKeyExtension(this, id));
+#if QT_CONFIG(wayland_client_primary_selection)
+    } else if (interface == QStringLiteral("zwp_primary_selection_device_manager_v1")) {
+        mPrimarySelectionManager.reset(new QWaylandPrimarySelectionDeviceManagerV1(this, id, 1));
+#endif
     } else if (interface == QStringLiteral("zwp_text_input_manager_v2") && !mClientSideInputContextRequested) {
         mTextInputManager.reset(new QtWayland::zwp_text_input_manager_v2(registry, id, 1));
         for (QWaylandInputDevice *inputDevice : qAsConst(mInputDevices))
diff --git a/src/client/qwaylanddisplay_p.h b/src/client/qwaylanddisplay_p.h
index 2c7ed3231..67df545f6 100644
--- a/src/client/qwaylanddisplay_p.h
+++ b/src/client/qwaylanddisplay_p.h
@@ -93,6 +93,9 @@ class QWaylandScreen;
 class QWaylandClientBufferIntegration;
 class QWaylandWindowManagerIntegration;
 class QWaylandDataDeviceManager;
+#if QT_CONFIG(wayland_client_primary_selection)
+class QWaylandPrimarySelectionDeviceManagerV1;
+#endif
 class QWaylandTouchExtension;
 class QWaylandQtKeyExtension;
 class QWaylandWindow;
@@ -150,6 +153,9 @@ public:
 #if QT_CONFIG(wayland_datadevice)
     QWaylandDataDeviceManager *dndSelectionHandler() const { return mDndSelectionHandler.data(); }
 #endif
+#if QT_CONFIG(wayland_client_primary_selection)
+    QWaylandPrimarySelectionDeviceManagerV1 *primarySelectionManager() const { return mPrimarySelectionManager.data(); }
+#endif
     QtWayland::qt_surface_extension *windowExtension() const { return mWindowExtension.data(); }
     QWaylandTouchExtension *touchExtension() const { return mTouchExtension.data(); }
     QtWayland::zwp_text_input_manager_v2 *textInputManager() const { return mTextInputManager.data(); }
@@ -238,6 +244,9 @@ private:
     QScopedPointer<QWaylandTouchExtension> mTouchExtension;
     QScopedPointer<QWaylandQtKeyExtension> mQtKeyExtension;
     QScopedPointer<QWaylandWindowManagerIntegration> mWindowManagerIntegration;
+#if QT_CONFIG(wayland_client_primary_selection)
+    QScopedPointer<QWaylandPrimarySelectionDeviceManagerV1> mPrimarySelectionManager;
+#endif
     QScopedPointer<QtWayland::zwp_text_input_manager_v2> mTextInputManager;
     QScopedPointer<QWaylandHardwareIntegration> mHardwareIntegration;
     QScopedPointer<QtWayland::zxdg_output_manager_v1> mXdgOutputManager;
diff --git a/src/client/qwaylandinputdevice.cpp b/src/client/qwaylandinputdevice.cpp
index f0fd99563..8a580898d 100644
--- a/src/client/qwaylandinputdevice.cpp
+++ b/src/client/qwaylandinputdevice.cpp
@@ -47,6 +47,9 @@
 #include "qwaylanddatadevice_p.h"
 #include "qwaylanddatadevicemanager_p.h"
 #endif
+#if QT_CONFIG(wayland_client_primary_selection)
+#include "qwaylandprimaryselectionv1_p.h"
+#endif
 #include "qwaylandtouch_p.h"
 #include "qwaylandscreen_p.h"
 #include "qwaylandcursor_p.h"
@@ -363,6 +366,12 @@ QWaylandInputDevice::QWaylandInputDevice(QWaylandDisplay *display, int version,
     }
 #endif
 
+#if QT_CONFIG(wayland_client_primary_selection)
+    // TODO: Could probably decouple this more if there was a signal for new seat added
+    if (auto *psm = mQDisplay->primarySelectionManager())
+        setPrimarySelectionDevice(psm->createDevice(this));
+#endif
+
     if (mQDisplay->textInputManager())
         mTextInput.reset(new QWaylandTextInput(mQDisplay, mQDisplay->textInputManager()->get_text_input(wl_seat())));
 
@@ -446,6 +455,18 @@ QWaylandDataDevice *QWaylandInputDevice::dataDevice() const
 }
 #endif
 
+#if QT_CONFIG(wayland_client_primary_selection)
+void QWaylandInputDevice::setPrimarySelectionDevice(QWaylandPrimarySelectionDeviceV1 *primarySelectionDevice)
+{
+    mPrimarySelectionDevice.reset(primarySelectionDevice);
+}
+
+QWaylandPrimarySelectionDeviceV1 *QWaylandInputDevice::primarySelectionDevice() const
+{
+    return mPrimarySelectionDevice.data();
+}
+#endif
+
 void QWaylandInputDevice::setTextInput(QWaylandTextInput *textInput)
 {
     mTextInput.reset(textInput);
@@ -1190,6 +1211,10 @@ void QWaylandInputDevice::Keyboard::handleFocusLost()
     if (auto *dataDevice = mParent->dataDevice())
         dataDevice->invalidateSelectionOffer();
 #endif
+#if QT_CONFIG(wayland_client_primary_selection)
+    if (auto *device = mParent->primarySelectionDevice())
+        device->invalidateSelectionOffer();
+#endif
     mParent->mQDisplay->handleKeyboardFocusChanged(mParent);
     mRepeatTimer.stop();
 }
diff --git a/src/client/qwaylandinputdevice_p.h b/src/client/qwaylandinputdevice_p.h
index f44f1ab1f..06ba5d566 100644
--- a/src/client/qwaylandinputdevice_p.h
+++ b/src/client/qwaylandinputdevice_p.h
@@ -78,11 +78,17 @@ struct wl_cursor_image;
 
 QT_BEGIN_NAMESPACE
 
+namespace QtWayland {
+class zwp_primary_selection_device_v1;
+} //namespace QtWayland
+
 namespace QtWaylandClient {
 
-class QWaylandWindow;
-class QWaylandDisplay;
 class QWaylandDataDevice;
+class QWaylandDisplay;
+#if QT_CONFIG(wayland_client_primary_selection)
+class QWaylandPrimarySelectionDeviceV1;
+#endif
 class QWaylandTextInput;
 #if QT_CONFIG(cursor)
 class QWaylandCursorTheme;
@@ -116,6 +122,11 @@ public:
     QWaylandDataDevice *dataDevice() const;
 #endif
 
+#if QT_CONFIG(wayland_client_primary_selection)
+    void setPrimarySelectionDevice(QWaylandPrimarySelectionDeviceV1 *primarySelectionDevice);
+    QWaylandPrimarySelectionDeviceV1 *primarySelectionDevice() const;
+#endif
+
     void setTextInput(QWaylandTextInput *textInput);
     QWaylandTextInput *textInput() const;
 
@@ -159,6 +170,10 @@ private:
     QWaylandDataDevice *mDataDevice = nullptr;
 #endif
 
+#if QT_CONFIG(wayland_client_primary_selection)
+    QScopedPointer<QWaylandPrimarySelectionDeviceV1> mPrimarySelectionDevice;
+#endif
+
     Keyboard *mKeyboard = nullptr;
     Pointer *mPointer = nullptr;
     Touch *mTouch = nullptr;
diff --git a/src/client/qwaylandprimaryselectionv1.cpp b/src/client/qwaylandprimaryselectionv1.cpp
new file mode 100644
index 000000000..3ddf6dac3
--- /dev/null
+++ b/src/client/qwaylandprimaryselectionv1.cpp
@@ -0,0 +1,162 @@
+/****************************************************************************
+**
+** Copyright (C) 2019 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the plugins 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 "qwaylandprimaryselectionv1_p.h"
+#include "qwaylandinputdevice_p.h"
+#include "qwaylanddisplay_p.h"
+#include "qwaylandmimehelper_p.h"
+
+#include <QtGui/private/qguiapplication_p.h>
+
+#include <qpa/qplatformclipboard.h>
+
+QT_BEGIN_NAMESPACE
+
+namespace QtWaylandClient {
+
+QWaylandPrimarySelectionDeviceManagerV1::QWaylandPrimarySelectionDeviceManagerV1(QWaylandDisplay *display, uint id, uint version)
+    : zwp_primary_selection_device_manager_v1(display->wl_registry(), id, qMin(version, uint(1)))
+    , m_display(display)
+{
+    // Create devices for all seats.
+    // This only works if we get the global before all devices
+    const auto seats = m_display->inputDevices();
+    for (auto *seat : seats)
+        seat->setPrimarySelectionDevice(createDevice(seat));
+}
+
+QWaylandPrimarySelectionDeviceV1 *QWaylandPrimarySelectionDeviceManagerV1::createDevice(QWaylandInputDevice *seat)
+{
+    return new QWaylandPrimarySelectionDeviceV1(this, seat);
+}
+
+QWaylandPrimarySelectionOfferV1::QWaylandPrimarySelectionOfferV1(QWaylandDisplay *display, ::zwp_primary_selection_offer_v1 *offer)
+    : zwp_primary_selection_offer_v1(offer)
+    , m_display(display)
+    , m_mimeData(new QWaylandMimeData(this))
+{}
+
+void QWaylandPrimarySelectionOfferV1::startReceiving(const QString &mimeType, int fd)
+{
+    receive(mimeType, fd);
+    wl_display_flush(m_display->wl_display());
+}
+
+void QWaylandPrimarySelectionOfferV1::zwp_primary_selection_offer_v1_offer(const QString &mime_type)
+{
+    m_mimeData->appendFormat(mime_type);
+}
+
+QWaylandPrimarySelectionDeviceV1::QWaylandPrimarySelectionDeviceV1(
+        QWaylandPrimarySelectionDeviceManagerV1 *manager, QWaylandInputDevice *seat)
+    : QtWayland::zwp_primary_selection_device_v1(manager->get_device(seat->wl_seat()))
+    , m_display(manager->display())
+    , m_seat(seat)
+{
+}
+
+QWaylandPrimarySelectionDeviceV1::~QWaylandPrimarySelectionDeviceV1()
+{
+    destroy();
+}
+
+void QWaylandPrimarySelectionDeviceV1::setSelectionSource(QWaylandPrimarySelectionSourceV1 *source)
+{
+    if (source) {
+        connect(source, &QWaylandPrimarySelectionSourceV1::cancelled, this, [this]() {
+            m_selectionSource.reset();
+            QGuiApplicationPrivate::platformIntegration()->clipboard()->emitChanged(QClipboard::Selection);
+        });
+    }
+    set_selection(source ? source->object() : nullptr, m_seat->serial());
+    m_selectionSource.reset(source);
+}
+
+void QWaylandPrimarySelectionDeviceV1::zwp_primary_selection_device_v1_data_offer(zwp_primary_selection_offer_v1 *offer)
+{
+    new QWaylandPrimarySelectionOfferV1(m_display, offer);
+}
+
+void QWaylandPrimarySelectionDeviceV1::zwp_primary_selection_device_v1_selection(zwp_primary_selection_offer_v1 *id)
+{
+
+    if (id)
+        m_selectionOffer.reset(static_cast<QWaylandPrimarySelectionOfferV1 *>(zwp_primary_selection_offer_v1_get_user_data(id)));
+    else
+        m_selectionOffer.reset();
+
+    QGuiApplicationPrivate::platformIntegration()->clipboard()->emitChanged(QClipboard::Selection);
+}
+
+QWaylandPrimarySelectionSourceV1::QWaylandPrimarySelectionSourceV1(QWaylandPrimarySelectionDeviceManagerV1 *manager, QMimeData *mimeData)
+    : QtWayland::zwp_primary_selection_source_v1(manager->create_source())
+    , m_mimeData(mimeData)
+{
+    if (!mimeData)
+        return;
+    for (auto &format : mimeData->formats())
+        offer(format);
+}
+
+QWaylandPrimarySelectionSourceV1::~QWaylandPrimarySelectionSourceV1()
+{
+    destroy();
+}
+
+void QWaylandPrimarySelectionSourceV1::zwp_primary_selection_source_v1_send(const QString &mime_type, int32_t fd)
+{
+    QByteArray content = QWaylandMimeHelper::getByteArray(m_mimeData, mime_type);
+    if (!content.isEmpty()) {
+        // Create a sigpipe handler that does nothing, or clients may be forced to terminate
+        // if the pipe is closed in the other end.
+        struct sigaction action, oldAction;
+        action.sa_handler = SIG_IGN;
+        sigemptyset (&action.sa_mask);
+        action.sa_flags = 0;
+
+        sigaction(SIGPIPE, &action, &oldAction);
+        write(fd, content.constData(), size_t(content.size()));
+        sigaction(SIGPIPE, &oldAction, nullptr);
+    }
+    close(fd);
+}
+
+} // namespace QtWaylandClient
+
+QT_END_NAMESPACE
diff --git a/src/client/qwaylandprimaryselectionv1_p.h b/src/client/qwaylandprimaryselectionv1_p.h
new file mode 100644
index 000000000..b165c51b8
--- /dev/null
+++ b/src/client/qwaylandprimaryselectionv1_p.h
@@ -0,0 +1,148 @@
+/****************************************************************************
+**
+** Copyright (C) 2019 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the plugins 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 QWAYLANDPRIMARYSELECTIONV1_P_H
+#define QWAYLANDPRIMARYSELECTIONV1_P_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 <QtWaylandClient/private/qwayland-wp-primary-selection-unstable-v1.h>
+
+#include <QtWaylandClient/private/qtwaylandclientglobal_p.h>
+#include <QtWaylandClient/private/qwaylanddataoffer_p.h>
+
+#include <QtCore/QObject>
+
+QT_REQUIRE_CONFIG(wayland_client_primary_selection);
+
+QT_BEGIN_NAMESPACE
+
+class QMimeData;
+
+namespace QtWaylandClient {
+
+class QWaylandInputDevice;
+class QWaylandPrimarySelectionDeviceV1;
+
+class QWaylandPrimarySelectionDeviceManagerV1 : public QtWayland::zwp_primary_selection_device_manager_v1
+{
+public:
+    explicit QWaylandPrimarySelectionDeviceManagerV1(QWaylandDisplay *display, uint id, uint version);
+    QWaylandPrimarySelectionDeviceV1 *createDevice(QWaylandInputDevice *seat);
+    QWaylandDisplay *display() const { return m_display; }
+
+private:
+    QWaylandDisplay *m_display = nullptr;
+};
+
+class QWaylandPrimarySelectionOfferV1 : public QtWayland::zwp_primary_selection_offer_v1, public QWaylandAbstractDataOffer
+{
+public:
+    explicit QWaylandPrimarySelectionOfferV1(QWaylandDisplay *display, ::zwp_primary_selection_offer_v1 *offer);
+    ~QWaylandPrimarySelectionOfferV1() override { destroy(); }
+    void startReceiving(const QString &mimeType, int fd) override;
+    QMimeData *mimeData() override { return m_mimeData.data(); }
+
+protected:
+    void zwp_primary_selection_offer_v1_offer(const QString &mime_type) override;
+
+private:
+    QWaylandDisplay *m_display = nullptr;
+    QScopedPointer<QWaylandMimeData> m_mimeData;
+};
+
+class Q_WAYLAND_CLIENT_EXPORT QWaylandPrimarySelectionSourceV1 : public QObject, public QtWayland::zwp_primary_selection_source_v1
+{
+    Q_OBJECT
+public:
+    explicit QWaylandPrimarySelectionSourceV1(QWaylandPrimarySelectionDeviceManagerV1 *manager, QMimeData *mimeData);
+    ~QWaylandPrimarySelectionSourceV1() override;
+
+    QMimeData *mimeData() const { return m_mimeData; }
+
+signals:
+    void cancelled();
+
+protected:
+    void zwp_primary_selection_source_v1_send(const QString &mime_type, int32_t fd) override;
+    void zwp_primary_selection_source_v1_cancelled() override { emit cancelled(); }
+
+private:
+    QWaylandDisplay *m_display = nullptr;
+    QMimeData *m_mimeData = nullptr;
+};
+
+class QWaylandPrimarySelectionDeviceV1 : public QObject, public QtWayland::zwp_primary_selection_device_v1
+{
+    Q_OBJECT
+    QWaylandPrimarySelectionDeviceV1(QWaylandPrimarySelectionDeviceManagerV1 *manager, QWaylandInputDevice *seat);
+
+public:
+    ~QWaylandPrimarySelectionDeviceV1() override;
+    QWaylandPrimarySelectionOfferV1 *selectionOffer() const { return m_selectionOffer.data(); }
+    void invalidateSelectionOffer() { m_selectionOffer.reset(); }
+    QWaylandPrimarySelectionSourceV1 *selectionSource() const { return m_selectionSource.data(); }
+    void setSelectionSource(QWaylandPrimarySelectionSourceV1 *source);
+
+protected:
+    void zwp_primary_selection_device_v1_data_offer(struct ::zwp_primary_selection_offer_v1 *offer) override;
+    void zwp_primary_selection_device_v1_selection(struct ::zwp_primary_selection_offer_v1 *id) override;
+
+private:
+    QWaylandDisplay *m_display = nullptr;
+    QWaylandInputDevice *m_seat = nullptr;
+    QScopedPointer<QWaylandPrimarySelectionOfferV1> m_selectionOffer;
+    QScopedPointer<QWaylandPrimarySelectionSourceV1> m_selectionSource;
+    friend class QWaylandPrimarySelectionDeviceManagerV1;
+};
+
+} // namespace QtWaylandClient
+
+QT_END_NAMESPACE
+
+#endif // QWAYLANDPRIMARYSELECTIONV1_P_H