Client: Add shell integration for xdg-shell stable

[ChangeLog][QPA plugin] Added support for xdg-shell stable.

Mostly a copy of xdg_shell unstable v6 with prefixes and suffixes
removed. Otherwise, this is what changed:

- The global is now named "xdg_wm_base", since "xdg_shell" was taken by
  xdg-shell <= v5.
- Anchors and gravities are not bitfields anymore.

Task-number: QTBUG-66783
Change-Id: I8ca881aae52cc07b22ff5e26df13a9a1566f58f4
Reviewed-by: Paul Olav Tvete <paul.tvete@qt.io>

src/3rdparty/wayland/protocols/qt_attribution.json

@@ -41,7 +41,7 @@ Copyright (c) 2013 BMW Car IT GmbH"
         "Name": "Wayland XDG Shell Protocol",
         "QDocModule": "qtwaylandcompositor",
         "QtUsage": "Used in the Qt Wayland Compositor, and the Qt Wayland platform plugin.",
-        "Files": "xdg-shell-unstable-v5.xml xdg-shell-unstable-v6.xml",
+        "Files": "xdg-shell-unstable-v5.xml xdg-shell-unstable-v6.xml xdg-shell.xml",
 
         "Description": "The XDG-Shell protocol is an extended way to manage surfaces under Wayland compositors.",
         "Homepage": "https://wayland.freedesktop.org",

src/plugins/platforms/wayland/plugins/shellintegration/shellintegration.pro

@@ -2,6 +2,7 @@ TEMPLATE = subdirs
 
 SUBDIRS += \
     ivi-shell \
+    xdg-shell \
     xdg-shell-v5 \
     xdg-shell-v6 \
     wl-shell \

src/plugins/platforms/wayland/plugins/shellintegration/xdg-shell/main.cpp

@@ -0,0 +1,68 @@
+/****************************************************************************
+**
+** Copyright (C) 2018 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 "qwaylandxdgshellintegration_p.h"
+
+#include <QtWaylandClient/private/qwaylandshellintegrationplugin_p.h>
+
+QT_BEGIN_NAMESPACE
+
+namespace QtWaylandClient {
+
+class QWaylandXdgShellIntegrationPlugin : public QWaylandShellIntegrationPlugin
+{
+    Q_OBJECT
+    Q_PLUGIN_METADATA(IID QWaylandShellIntegrationFactoryInterface_iid FILE "xdg-shell.json")
+
+public:
+    QWaylandShellIntegration *create(const QString &key, const QStringList &paramList) override;
+};
+
+QWaylandShellIntegration *QWaylandXdgShellIntegrationPlugin::create(const QString &key, const QStringList &paramList)
+{
+    Q_UNUSED(key);
+    Q_UNUSED(paramList);
+    return new QWaylandXdgShellIntegration();
+}
+
+}
+
+QT_END_NAMESPACE
+
+#include "main.moc"

src/plugins/platforms/wayland/plugins/shellintegration/xdg-shell/qwaylandxdgshell.cpp

@@ -0,0 +1,337 @@
+/****************************************************************************
+**
+** Copyright (C) 2017 The Qt Company Ltd.
+** Copyright (C) 2017 Eurogiciel, author: <philippe.coval@eurogiciel.fr>
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the config.tests 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 "qwaylandxdgshell_p.h"
+
+#include <QtWaylandClient/private/qwaylanddisplay_p.h>
+#include <QtWaylandClient/private/qwaylandwindow_p.h>
+#include <QtWaylandClient/private/qwaylandinputdevice_p.h>
+#include <QtWaylandClient/private/qwaylandscreen_p.h>
+#include <QtWaylandClient/private/qwaylandabstractdecoration_p.h>
+
+QT_BEGIN_NAMESPACE
+
+namespace QtWaylandClient {
+
+QWaylandXdgSurface::Toplevel::Toplevel(QWaylandXdgSurface *xdgSurface)
+    : QtWayland::xdg_toplevel(xdgSurface->get_toplevel())
+    , m_xdgSurface(xdgSurface)
+{
+    requestWindowStates(xdgSurface->window()->window()->windowStates());
+}
+
+QWaylandXdgSurface::Toplevel::~Toplevel()
+{
+    if (m_applied.states & Qt::WindowActive) {
+        QWaylandWindow *window = m_xdgSurface->window();
+        window->display()->handleWindowDeactivated(window);
+    }
+    if (isInitialized())
+        destroy();
+}
+
+void QWaylandXdgSurface::Toplevel::applyConfigure()
+{
+    if (!(m_applied.states & (Qt::WindowMaximized|Qt::WindowFullScreen)))
+        m_normalSize = m_xdgSurface->m_window->window()->frameGeometry().size();
+
+    if (m_pending.size.isEmpty() && !m_normalSize.isEmpty())
+        m_pending.size = m_normalSize;
+
+    if ((m_pending.states & Qt::WindowActive) && !(m_applied.states & Qt::WindowActive))
+        m_xdgSurface->m_window->display()->handleWindowActivated(m_xdgSurface->m_window);
+
+    if (!(m_pending.states & Qt::WindowActive) && (m_applied.states & Qt::WindowActive))
+        m_xdgSurface->m_window->display()->handleWindowDeactivated(m_xdgSurface->m_window);
+
+    // TODO: none of the other plugins send WindowActive either, but is it on purpose?
+    Qt::WindowStates statesWithoutActive = m_pending.states & ~Qt::WindowActive;
+
+    m_xdgSurface->m_window->handleWindowStatesChanged(statesWithoutActive);
+    m_xdgSurface->m_window->resizeFromApplyConfigure(m_pending.size);
+    m_applied = m_pending;
+}
+
+void QWaylandXdgSurface::Toplevel::xdg_toplevel_configure(int32_t width, int32_t height, wl_array *states)
+{
+    m_pending.size = QSize(width, height);
+
+    auto *xdgStates = static_cast<uint32_t *>(states->data);
+    size_t numStates = states->size / sizeof(uint32_t);
+
+    m_pending.states = Qt::WindowNoState;
+
+    for (size_t i = 0; i < numStates; i++) {
+        switch (xdgStates[i]) {
+        case XDG_TOPLEVEL_STATE_ACTIVATED:
+            m_pending.states |= Qt::WindowActive;
+            break;
+        case XDG_TOPLEVEL_STATE_MAXIMIZED:
+            m_pending.states |= Qt::WindowMaximized;
+            break;
+        case XDG_TOPLEVEL_STATE_FULLSCREEN:
+            m_pending.states |= Qt::WindowFullScreen;
+            break;
+        default:
+            break;
+        }
+    }
+}
+
+void QWaylandXdgSurface::Toplevel::xdg_toplevel_close()
+{
+    m_xdgSurface->m_window->window()->close();
+}
+
+void QWaylandXdgSurface::Toplevel::requestWindowStates(Qt::WindowStates states)
+{
+    // Re-send what's different from the applied state
+    Qt::WindowStates changedStates = m_applied.states ^ states;
+
+    if (changedStates & Qt::WindowMaximized) {
+        if (states & Qt::WindowMaximized)
+            set_maximized();
+        else
+            unset_maximized();
+    }
+
+    if (changedStates & Qt::WindowFullScreen) {
+        if (states & Qt::WindowFullScreen)
+            set_fullscreen(nullptr);
+        else
+            unset_fullscreen();
+    }
+
+    // Minimized state is not reported by the protocol, so always send it
+    if (states & Qt::WindowMinimized) {
+        set_minimized();
+        m_xdgSurface->window()->handleWindowStatesChanged(states & ~Qt::WindowMinimized);
+    }
+}
+
+QWaylandXdgSurface::Popup::Popup(QWaylandXdgSurface *xdgSurface, QWaylandXdgSurface *parent,
+                                 QtWayland::xdg_positioner *positioner)
+    : xdg_popup(xdgSurface->get_popup(parent->object(), positioner->object()))
+    , m_xdgSurface(xdgSurface)
+{
+}
+
+QWaylandXdgSurface::Popup::~Popup()
+{
+    if (isInitialized())
+        destroy();
+}
+
+void QWaylandXdgSurface::Popup::applyConfigure()
+{
+}
+
+void QWaylandXdgSurface::Popup::xdg_popup_popup_done()
+{
+    m_xdgSurface->m_window->window()->close();
+}
+
+QWaylandXdgSurface::QWaylandXdgSurface(QWaylandXdgShell *shell, ::xdg_surface *surface, QWaylandWindow *window)
+    : QWaylandShellSurface(window)
+    , xdg_surface(surface)
+    , m_shell(shell)
+    , m_window(window)
+{
+}
+
+QWaylandXdgSurface::~QWaylandXdgSurface()
+{
+    if (m_toplevel)
+        xdg_toplevel_destroy(m_toplevel->object());
+    if (m_popup)
+        xdg_popup_destroy(m_popup->object());
+    destroy();
+}
+
+void QWaylandXdgSurface::resize(QWaylandInputDevice *inputDevice, xdg_toplevel_resize_edge edges)
+{
+    Q_ASSERT(m_toplevel && m_toplevel->isInitialized());
+    m_toplevel->resize(inputDevice->wl_seat(), inputDevice->serial(), edges);
+}
+
+void QWaylandXdgSurface::resize(QWaylandInputDevice *inputDevice, enum wl_shell_surface_resize edges)
+{
+    auto xdgEdges = reinterpret_cast<enum xdg_toplevel_resize_edge const * const>(&edges);
+    resize(inputDevice, *xdgEdges);
+}
+
+
+bool QWaylandXdgSurface::move(QWaylandInputDevice *inputDevice)
+{
+    if (m_toplevel && m_toplevel->isInitialized()) {
+        m_toplevel->move(inputDevice->wl_seat(), inputDevice->serial());
+        return true;
+    }
+    return false;
+}
+
+void QWaylandXdgSurface::setTitle(const QString &title)
+{
+    if (m_toplevel)
+        m_toplevel->set_title(title);
+}
+
+void QWaylandXdgSurface::setAppId(const QString &appId)
+{
+    if (m_toplevel)
+        m_toplevel->set_app_id(appId);
+}
+
+void QWaylandXdgSurface::setType(Qt::WindowType type, QWaylandWindow *transientParent)
+{
+    QWaylandDisplay *display = m_window->display();
+    if ((type == Qt::Popup || type == Qt::ToolTip) && transientParent && display->lastInputDevice()) {
+        setPopup(transientParent, display->lastInputDevice(), display->lastInputSerial(), type == Qt::Popup);
+    } else {
+        setToplevel();
+        if (transientParent) {
+            auto parentXdgSurface = static_cast<QWaylandXdgSurface *>(transientParent->shellSurface());
+            if (parentXdgSurface)
+                m_toplevel->set_parent(parentXdgSurface->m_toplevel->object());
+        }
+    }
+}
+
+bool QWaylandXdgSurface::handleExpose(const QRegion &region)
+{
+    if (!m_configured && !region.isEmpty()) {
+        m_exposeRegion = region;
+        return true;
+    }
+    return false;
+}
+
+void QWaylandXdgSurface::applyConfigure()
+{
+    Q_ASSERT(m_pendingConfigureSerial != 0);
+
+    if (m_toplevel)
+        m_toplevel->applyConfigure();
+    if (m_popup)
+        m_popup->applyConfigure();
+
+    m_configured = true;
+    ack_configure(m_pendingConfigureSerial);
+
+    m_pendingConfigureSerial = 0;
+}
+
+bool QWaylandXdgSurface::wantsDecorations() const
+{
+    return m_toplevel && !(m_toplevel->m_pending.states & Qt::WindowFullScreen);
+}
+
+void QWaylandXdgSurface::requestWindowStates(Qt::WindowStates states)
+{
+    if (m_toplevel)
+        m_toplevel->requestWindowStates(states);
+    else
+        qCWarning(lcQpaWayland) << "Non-toplevel surfaces can't request window states";
+}
+
+void QWaylandXdgSurface::setToplevel()
+{
+    Q_ASSERT(!m_toplevel && !m_popup);
+    m_toplevel = new Toplevel(this);
+}
+
+void QWaylandXdgSurface::setPopup(QWaylandWindow *parent, QWaylandInputDevice *device, int serial, bool grab)
+{
+    Q_ASSERT(!m_toplevel && !m_popup);
+
+    auto parentXdgSurface = static_cast<QWaylandXdgSurface *>(parent->shellSurface());
+    auto positioner = new QtWayland::xdg_positioner(m_shell->create_positioner());
+    // set_popup expects a position relative to the parent
+    QPoint transientPos = m_window->geometry().topLeft(); // this is absolute
+    transientPos -= parent->geometry().topLeft();
+    if (parent->decoration()) {
+        transientPos.setX(transientPos.x() + parent->decoration()->margins().left());
+        transientPos.setY(transientPos.y() + parent->decoration()->margins().top());
+    }
+    positioner->set_anchor_rect(transientPos.x(), transientPos.y(), 1, 1);
+    positioner->set_anchor(QtWayland::xdg_positioner::anchor_top_left);
+    positioner->set_gravity(QtWayland::xdg_positioner::gravity_bottom_right);
+    positioner->set_size(m_window->geometry().width(), m_window->geometry().height());
+    m_popup = new Popup(this, parentXdgSurface, positioner);
+    positioner->destroy();
+    delete positioner;
+    if (grab) {
+        m_popup->grab(device->wl_seat(), serial);
+    }
+}
+
+void QWaylandXdgSurface::xdg_surface_configure(uint32_t serial)
+{
+    m_window->applyConfigureWhenPossible();
+    m_pendingConfigureSerial = serial;
+    if (!m_exposeRegion.isEmpty()) {
+        QWindowSystemInterface::handleExposeEvent(m_window->window(), m_exposeRegion);
+        m_exposeRegion = QRegion();
+    }
+}
+
+QWaylandXdgShell::QWaylandXdgShell(struct ::wl_registry *registry, uint32_t id, uint32_t availableVersion)
+    : QtWayland::xdg_wm_base(registry, id, qMin(availableVersion, 1u))
+{
+}
+
+QWaylandXdgShell::~QWaylandXdgShell()
+{
+    destroy();
+}
+
+QWaylandXdgSurface *QWaylandXdgShell::getXdgSurface(QWaylandWindow *window)
+{
+    return new QWaylandXdgSurface(this, get_xdg_surface(window->object()), window);
+}
+
+void QWaylandXdgShell::xdg_wm_base_ping(uint32_t serial)
+{
+    pong(serial);
+}
+
+}
+
+QT_END_NAMESPACE

src/plugins/platforms/wayland/plugins/shellintegration/xdg-shell/qwaylandxdgshell_p.h

@@ -0,0 +1,161 @@
+/****************************************************************************
+**
+** Copyright (C) 2017 The Qt Company Ltd.
+** Copyright (C) 2017 Eurogiciel, author: <philippe.coval@eurogiciel.fr>
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the config.tests 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 QWAYLANDXDGSHELL_H
+#define QWAYLANDXDGSHELL_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 "qwayland-xdg-shell.h"
+
+#include <QtWaylandClient/qtwaylandclientglobal.h>
+#include <QtWaylandClient/private/qwaylandshellsurface_p.h>
+
+#include <QtCore/QSize>
+#include <QtGui/QRegion>
+
+#include <wayland-client.h>
+
+QT_BEGIN_NAMESPACE
+
+class QWindow;
+
+namespace QtWaylandClient {
+
+class QWaylandWindow;
+class QWaylandInputDevice;
+class QWaylandXdgShell;
+
+class Q_WAYLAND_CLIENT_EXPORT QWaylandXdgSurface : public QWaylandShellSurface, public QtWayland::xdg_surface
+{
+    Q_OBJECT
+public:
+    QWaylandXdgSurface(QWaylandXdgShell *shell, ::xdg_surface *surface, QWaylandWindow *window);
+    ~QWaylandXdgSurface() override;
+
+    void resize(QWaylandInputDevice *inputDevice, enum xdg_toplevel_resize_edge edges);
+    void resize(QWaylandInputDevice *inputDevice, enum wl_shell_surface_resize edges) override;
+    bool move(QWaylandInputDevice *inputDevice) override;
+    void setTitle(const QString &title) override;
+    void setAppId(const QString &appId) override;
+
+    void setType(Qt::WindowType type, QWaylandWindow *transientParent) override;
+    bool isExposed() const override { return m_configured; }
+    bool handleExpose(const QRegion &) override;
+    bool handlesActiveState() const { return m_toplevel; }
+    void applyConfigure() override;
+    bool wantsDecorations() const override;
+
+protected:
+    void requestWindowStates(Qt::WindowStates states) override;
+    void xdg_surface_configure(uint32_t serial) override;
+
+private:
+    class Toplevel: public QtWayland::xdg_toplevel
+    {
+    public:
+        Toplevel(QWaylandXdgSurface *xdgSurface);
+        ~Toplevel() override;
+
+        void applyConfigure();
+
+        void xdg_toplevel_configure(int32_t width, int32_t height, wl_array *states) override;
+        void xdg_toplevel_close() override;
+
+        void requestWindowStates(Qt::WindowStates states);
+        struct {
+            QSize size = {0, 0};
+            Qt::WindowStates states = Qt::WindowNoState;
+        }  m_pending, m_applied;
+        QSize m_normalSize;
+
+        QWaylandXdgSurface *m_xdgSurface = nullptr;
+    };
+
+    class Popup : public QtWayland::xdg_popup {
+    public:
+        Popup(QWaylandXdgSurface *xdgSurface, QWaylandXdgSurface *parent, QtWayland::xdg_positioner *positioner);
+        ~Popup() override;
+
+        void applyConfigure();
+        void xdg_popup_popup_done() override;
+
+        QWaylandXdgSurface *m_xdgSurface = nullptr;
+    };
+
+    void setToplevel();
+    void setPopup(QWaylandWindow *parent, QWaylandInputDevice *device, int serial, bool grab);
+
+    QWaylandXdgShell *m_shell = nullptr;
+    QWaylandWindow *m_window = nullptr;
+    Toplevel *m_toplevel = nullptr;
+    Popup *m_popup = nullptr;
+    bool m_configured = false;
+    QRegion m_exposeRegion;
+    uint m_pendingConfigureSerial = 0;
+};
+
+class Q_WAYLAND_CLIENT_EXPORT QWaylandXdgShell : public QtWayland::xdg_wm_base
+{
+public:
+    QWaylandXdgShell(struct ::wl_registry *registry, uint32_t id, uint32_t availableVersion);
+
+    QWaylandXdgSurface *getXdgSurface(QWaylandWindow *window);
+
+    ~QWaylandXdgShell() override;
+
+private:
+    void xdg_wm_base_ping(uint32_t serial) override;
+};
+
+QT_END_NAMESPACE
+
+}
+
+#endif // QWAYLANDXDGSHELL_H

src/plugins/platforms/wayland/plugins/shellintegration/xdg-shell/qwaylandxdgshellintegration.cpp

@@ -0,0 +1,87 @@
+/****************************************************************************
+**
+** Copyright (C) 2017 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 "qwaylandxdgshellintegration_p.h"
+
+#include <QtWaylandClient/private/qwaylandwindow_p.h>
+#include <QtWaylandClient/private/qwaylanddisplay_p.h>
+
+QT_BEGIN_NAMESPACE
+
+namespace QtWaylandClient {
+
+bool QWaylandXdgShellIntegration::initialize(QWaylandDisplay *display)
+{
+    for (QWaylandDisplay::RegistryGlobal global : display->globals()) {
+        if (global.interface == QLatin1String("xdg_wm_base")) {
+            m_xdgShell.reset(new QWaylandXdgShell(display->wl_registry(), global.id, global.version));
+            break;
+        }
+    }
+
+    if (!m_xdgShell) {
+        qCDebug(lcQpaWayland) << "Couldn't find global xdg_wm_base for xdg-shell stable";
+        return false;
+    }
+
+    return QWaylandShellIntegration::initialize(display);
+}
+
+QWaylandShellSurface *QWaylandXdgShellIntegration::createShellSurface(QWaylandWindow *window)
+{
+    return m_xdgShell->getXdgSurface(window);
+}
+
+void QWaylandXdgShellIntegration::handleKeyboardFocusChanged(QWaylandWindow *newFocus, QWaylandWindow *oldFocus)
+{
+    if (newFocus) {
+        auto *xdgSurface = qobject_cast<QWaylandXdgSurface *>(newFocus->shellSurface());
+        if (xdgSurface && !xdgSurface->handlesActiveState())
+            m_display->handleWindowActivated(newFocus);
+    }
+    if (oldFocus && qobject_cast<QWaylandXdgSurface *>(oldFocus->shellSurface())) {
+        auto *xdgSurface = qobject_cast<QWaylandXdgSurface *>(oldFocus->shellSurface());
+        if (xdgSurface && !xdgSurface->handlesActiveState())
+            m_display->handleWindowDeactivated(oldFocus);
+    }
+}
+
+}
+
+QT_END_NAMESPACE

src/plugins/platforms/wayland/plugins/shellintegration/xdg-shell/qwaylandxdgshellintegration_p.h

@@ -0,0 +1,78 @@
+/****************************************************************************
+**
+** Copyright (C) 2017 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 QWAYLANDXDGSHELLINTEGRATION_P_H
+#define QWAYLANDXDGSHELLINTEGRATION_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 "qwaylandxdgshell_p.h"
+
+#include <QtWaylandClient/private/qwaylandshellintegration_p.h>
+
+QT_BEGIN_NAMESPACE
+
+namespace QtWaylandClient {
+
+class Q_WAYLAND_CLIENT_EXPORT QWaylandXdgShellIntegration : public QWaylandShellIntegration
+{
+public:
+    QWaylandXdgShellIntegration() {}
+    bool initialize(QWaylandDisplay *display) override;
+    QWaylandShellSurface *createShellSurface(QWaylandWindow *window) override;
+    void handleKeyboardFocusChanged(QWaylandWindow *newFocus, QWaylandWindow *oldFocus) override;
+
+private:
+    QScopedPointer<QWaylandXdgShell> m_xdgShell;
+};
+
+}
+
+QT_END_NAMESPACE
+
+#endif // QWAYLANDXDGSHELLINTEGRATION_P_H

src/plugins/platforms/wayland/plugins/shellintegration/xdg-shell/xdg-shell.json

@@ -0,0 +1,3 @@
+{
+    "Keys":[ "xdg-shell" ]
+}

src/plugins/platforms/wayland/plugins/shellintegration/xdg-shell/xdg-shell.pro

@@ -0,0 +1,23 @@
+QT += gui-private waylandclient-private
+CONFIG += wayland-scanner
+
+QMAKE_USE += wayland-client
+
+WAYLANDCLIENTSOURCES += \
+    ../../../3rdparty/protocol/xdg-shell.xml
+
+HEADERS += \
+    qwaylandxdgshell_p.h \
+    qwaylandxdgshellintegration_p.h \
+
+SOURCES += \
+    main.cpp \
+    qwaylandxdgshell.cpp \
+    qwaylandxdgshellintegration.cpp \
+
+OTHER_FILES += \
+    xdg-shell.json
+
+PLUGIN_TYPE = wayland-shell-integration
+PLUGIN_CLASS_NAME = QWaylandXdgShellIntegrationPlugin
+load(qt_plugin)

src/plugins/platforms/wayland/qwaylandintegration.cpp

@@ -388,6 +388,7 @@ void QWaylandIntegration::initializeShellIntegration()
     if (!targetKey.isEmpty()) {
         preferredShells << targetKey;
     } else {
+        preferredShells << QLatin1String("xdg-shell");
         preferredShells << QLatin1String("xdg-shell-v6");
         QString useXdgShell = QString::fromLocal8Bit(qgetenv("QT_WAYLAND_USE_XDG_SHELL"));
         if (!useXdgShell.isEmpty() && useXdgShell != QLatin1String("0")) {