Client: Fix popup position for xdg shell

Popups used xdg_surface instead of xdg_popup. It's not possible to set a
position for an xdg_surface, because it's supposed to be a top level window (in
xdg shell v5). Consequently, popups were treated as top level windows and
positioned randomly on Weston.

Using xdg_popup instead solves the problem.

Task-number: QTBUG-55063
Change-Id: I223348677ef8a1ef1eee6a4c389276a6c802bcb5
Reviewed-by: Giulio Camuffo <giulio.camuffo@kdab.com>

src/plugins/platforms/wayland/client.pro

@@ -62,6 +62,7 @@ SOURCES +=  qwaylandintegration.cpp \
             qwaylandwlshellintegration.cpp \
             qwaylandxdgshell.cpp \
             qwaylandxdgsurface.cpp \
+            qwaylandxdgpopup_p.cpp \
             qwaylandxdgshellintegration.cpp \
             qwaylandextendedsurface.cpp \
             qwaylandsubsurface.cpp \
@@ -97,6 +98,7 @@ HEADERS +=  qwaylandintegration_p.h \
             qwaylandwlshellintegration_p.h \
             qwaylandxdgshell_p.h \
             qwaylandxdgsurface_p.h \
+            qwaylandxdgpopup_p.h \
             qwaylandxdgshellintegration_p.h \
             qwaylandextendedsurface_p.h \
             qwaylandsubsurface_p.h \

src/plugins/platforms/wayland/qwaylandxdgpopup_p.cpp

@@ -0,0 +1,61 @@
+/****************************************************************************
+**
+** Copyright (C) 2016 The Qt Company Ltd.
+** Contact: http://www.qt.io/licensing/
+**
+** This file is part of the plugins of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL21$
+** 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 http://www.qt.io/terms-conditions. For further
+** information use the contact form at http://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 2.1 or version 3 as published by the Free
+** Software Foundation and appearing in the file LICENSE.LGPLv21 and
+** LICENSE.LGPLv3 included in the packaging of this file. Please review the
+** following information to ensure the GNU Lesser General Public License
+** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
+** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** As a special exception, The Qt Company gives you certain additional
+** rights. These rights are described in The Qt Company LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qwaylandxdgpopup_p.h"
+
+#include "qwaylandwindow_p.h"
+#include "qwaylanddisplay_p.h"
+#include "qwaylandextendedsurface_p.h"
+
+QT_BEGIN_NAMESPACE
+
+namespace QtWaylandClient {
+
+QWaylandXdgPopup::QWaylandXdgPopup(struct ::xdg_popup *popup, QWaylandWindow *window)
+    : QWaylandShellSurface(window)
+    , QtWayland::xdg_popup(popup)
+    , m_extendedWindow(nullptr)
+{
+    if (window->display()->windowExtension())
+        m_extendedWindow = new QWaylandExtendedSurface(window);
+}
+
+QWaylandXdgPopup::~QWaylandXdgPopup()
+{
+    xdg_popup_destroy(object());
+    delete m_extendedWindow;
+}
+
+}
+
+QT_END_NAMESPACE

src/plugins/platforms/wayland/qwaylandxdgpopup_p.h

@@ -0,0 +1,79 @@
+/****************************************************************************
+**
+** Copyright (C) 2016 The Qt Company Ltd.
+** Contact: http://www.qt.io/licensing/
+**
+** This file is part of the config.tests of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL21$
+** 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 http://www.qt.io/terms-conditions. For further
+** information use the contact form at http://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 2.1 or version 3 as published by the Free
+** Software Foundation and appearing in the file LICENSE.LGPLv21 and
+** LICENSE.LGPLv3 included in the packaging of this file. Please review the
+** following information to ensure the GNU Lesser General Public License
+** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
+** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** As a special exception, The Qt Company gives you certain additional
+** rights. These rights are described in The Qt Company LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QWAYLANDXDGPOPUP_P_H
+#define QWAYLANDXDGPOPUP_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 <wayland-client.h>
+
+#include <QtWaylandClient/private/qwayland-xdg-shell.h>
+#include <QtWaylandClient/private/qwaylandclientexport_p.h>
+#include "qwaylandshellsurface_p.h"
+
+QT_BEGIN_NAMESPACE
+
+class QWindow;
+
+namespace QtWaylandClient {
+
+class QWaylandWindow;
+class QWaylandExtendedSurface;
+
+class Q_WAYLAND_CLIENT_EXPORT QWaylandXdgPopup : public QWaylandShellSurface
+        , public QtWayland::xdg_popup
+{
+    Q_OBJECT
+public:
+    QWaylandXdgPopup(struct ::xdg_popup *popup, QWaylandWindow *window);
+    virtual ~QWaylandXdgPopup();
+
+private:
+    QWaylandExtendedSurface *m_extendedWindow;
+};
+
+QT_END_NAMESPACE
+
+}
+
+#endif // QWAYLANDXDGPOPUP_P_H

src/plugins/platforms/wayland/qwaylandxdgshell.cpp

@@ -37,6 +37,7 @@
 #include "qwaylandwindow_p.h"
 #include "qwaylandinputdevice_p.h"
 #include "qwaylandscreen_p.h"
+#include "qwaylandxdgpopup_p.h"
 #include "qwaylandxdgsurface_p.h"
 
 #include <QtCore/QDebug>
@@ -66,6 +67,19 @@ QWaylandXdgSurface *QWaylandXdgShell::createXdgSurface(QWaylandWindow *window)
     return new QWaylandXdgSurface(this, window);
 }
 
+QWaylandXdgPopup *QWaylandXdgShell::createXdgPopup(QWaylandWindow *window)
+{
+    QWaylandWindow *parentWindow = window->transientParent();
+    ::wl_surface *parentSurface = parentWindow->object();
+    QWaylandInputDevice *inputDevice = window->display()->lastInputDevice();
+    ::wl_seat *seat = inputDevice->wl_seat();
+    uint serial = inputDevice->serial();
+    QPoint position = window->geometry().topLeft();
+    int x = position.x() + parentWindow->frameMargins().left();
+    int y = position.y() + parentWindow->frameMargins().top();
+    return new QWaylandXdgPopup(get_xdg_popup(window->object(), parentSurface, seat, serial, x, y), window);
+}
+
 void QWaylandXdgShell::xdg_shell_ping(uint32_t serial)
 {
     pong(serial);

src/plugins/platforms/wayland/qwaylandxdgshell_p.h

@@ -62,6 +62,7 @@ namespace QtWaylandClient {
 class QWaylandWindow;
 class QWaylandInputDevice;
 class QWaylandXdgSurface;
+class QWaylandXdgPopup;
 
 class Q_WAYLAND_CLIENT_EXPORT QWaylandXdgShell : public QtWayland::xdg_shell
 {
@@ -71,6 +72,7 @@ public:
     virtual ~QWaylandXdgShell();
 
     QWaylandXdgSurface *createXdgSurface(QWaylandWindow *window);
+    QWaylandXdgPopup *createXdgPopup(QWaylandWindow *window);
 
 private:
     void xdg_shell_ping(uint32_t serial) Q_DECL_OVERRIDE;

src/plugins/platforms/wayland/qwaylandxdgshellintegration.cpp

@@ -36,6 +36,7 @@
 #include <QtWaylandClient/private/qwaylandwindow_p.h>
 #include <QtWaylandClient/private/qwaylanddisplay_p.h>
 #include <QtWaylandClient/private/qwaylandxdgsurface_p.h>
+#include <QtWaylandClient/private/qwaylandxdgpopup_p.h>
 #include <QtWaylandClient/private/qwaylandxdgshell_p.h>
 
 QT_BEGIN_NAMESPACE
@@ -55,7 +56,10 @@ QWaylandXdgShellIntegration::QWaylandXdgShellIntegration(QWaylandDisplay *displa
 
 QWaylandShellSurface *QWaylandXdgShellIntegration::createShellSurface(QWaylandWindow *window)
 {
-    return m_xdgShell->createXdgSurface(window);
+    if (window->window()->type() == Qt::WindowType::Popup)
+        return m_xdgShell->createXdgPopup(window);
+    else
+        return m_xdgShell->createXdgSurface(window);
 }
 
 }