gtk3+wayland: implement video playback under gtk3 + wayland

split the gtk2 and gtk3 gtkobjects

(cherry picked from commit 31fa4545985acc1594107e087cedc2d99b3d0f0b)

Change-Id: I32084232c44a12e9641010b51e75710abc827695

rename X11WindowProvider to a NativeWindowHandle provider

sort of thing and genericize it

(cherry picked from commit e35e762d564da18b0b508112f3e4d78fd26ba99c)

Change-Id: I27e1e47f2b371e5269db079cfc1262d056105f80

implement wayland handle passing for gstreamer

Change-Id: I3b0effe35ad7b37ff7ab3de2a3b78b6312779139
(cherry picked from commit c0d4f3ad3307c7a0d0fddd8c413ef0cc91d382ae)

gtk3+wayland: play video via gtksink gstreamer element

(cherry picked from commit 8543fbc72fafc0d71a8760752ca2ef5b7119cb5c)

Change-Id: Ib371fa06eda73962cbe94739e69a68b46c26e4bf
Reviewed-on: https://gerrit.libreoffice.org/22462
Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Miklos Vajna <vmiklos@collabora.co.uk>

14 files changed, 290 insertions, 133 deletions

diff --git a/vcl/Library_vcl.mk b/vcl/Library_vcl.mk
index a9fe72fd73a4..da80ab65ea71 100644
--- a/vcl/Library_vcl.mk
+++ b/vcl/Library_vcl.mk
@@ -581,7 +581,7 @@ $(eval $(call gb_Library_add_exception_objects,vcl,\
     vcl/unx/generic/plugadapt/salplug \
     vcl/unx/generic/printer/jobdata \
     vcl/unx/generic/printer/ppdparser \
-    vcl/unx/generic/gdi/x11windowprovider \
+    vcl/unx/generic/gdi/nativewindowhandleprovider \
     vcl/unx/generic/window/screensaverinhibitor \
     $(if $(filter TRUE,$(ENABLE_CUPS)),\
         vcl/unx/generic/printer/cupsmgr \
diff --git a/vcl/inc/unx/gtk/gtkframe.hxx b/vcl/inc/unx/gtk/gtkframe.hxx
index da629b7ef047..20a1e848fb4f 100644
--- a/vcl/inc/unx/gtk/gtkframe.hxx
+++ b/vcl/inc/unx/gtk/gtkframe.hxx
@@ -33,7 +33,7 @@
 
 #include <salframe.hxx>
 #include <vcl/sysdata.hxx>
-#include <unx/x11windowprovider.hxx>
+#include <unx/nativewindowhandleprovider.hxx>
 #include <unx/saltype.h>
 #include <unx/screensaverinhibitor.hxx>
 
@@ -66,7 +66,8 @@ class GtkDnDTransferable;
     typedef void GDBusConnection;
 #endif
 
-class GtkSalFrame : public SalFrame, public X11WindowProvider
+class GtkSalFrame : public SalFrame
+                  , public NativeWindowHandleProvider
 {
     struct IMHandler
     {
@@ -518,7 +519,8 @@ public:
 
     static GtkSalFrame         *getFromWindow( GtkWindow *pWindow );
 
-    virtual Window              GetX11Window() override;
+    sal_uIntPtr                 GetNativeWindowHandle(GtkWidget *pWidget);
+    virtual sal_uIntPtr         GetNativeWindowHandle() override;
 
     static void                 KeyCodeToGdkKey(const vcl::KeyCode& rKeyCode,
         guint* pGdkKeyCode, GdkModifierType *pGdkModifiers);
diff --git a/vcl/inc/unx/x11windowprovider.hxx b/vcl/inc/unx/nativewindowhandleprovider.hxx
index 776c8e4c4b34..1d85cb4cf5ef 100644
--- a/vcl/inc/unx/x11windowprovider.hxx
+++ b/vcl/inc/unx/nativewindowhandleprovider.hxx
@@ -7,20 +7,17 @@
  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
  */
 
-#ifndef INCLUDED_VCL_UNX_X11WINDOWPROVIDER
-#define INCLUDED_VCL_UNX_X11WINDOWPROVIDER
-
-#include <prex.h>
-#include <postx.h>
+#ifndef INCLUDED_VCL_UNX_NATIVEWINDOWHANDLEPROVIDER
+#define INCLUDED_VCL_UNX_NATIVEWINDOWHANDLEPROVIDER
 
 #include <vcl/dllapi.h>
 
-class VCL_PLUGIN_PUBLIC X11WindowProvider
+class VCL_PLUGIN_PUBLIC NativeWindowHandleProvider
 {
 public:
-    virtual ~X11WindowProvider();
+    virtual ~NativeWindowHandleProvider();
 
-    virtual Window GetX11Window() = 0;
+    virtual sal_uIntPtr GetNativeWindowHandle() = 0;
 };
 
 #endif
diff --git a/vcl/inc/unx/salframe.h b/vcl/inc/unx/salframe.h
index 9ba19574cbbf..9848e1eeb15b 100644
--- a/vcl/inc/unx/salframe.h
+++ b/vcl/inc/unx/salframe.h
@@ -27,7 +27,7 @@
 #include <unx/saltype.h>
 #include <unx/saldisp.hxx>
 #include <unx/screensaverinhibitor.hxx>
-#include <unx/x11windowprovider.hxx>
+#include <unx/nativewindowhandleprovider.hxx>
 #include <salframe.hxx>
 #include <salwtype.hxx>
 #include <salinst.hxx>
@@ -50,7 +50,7 @@ namespace vcl_sal { class WMAdaptor; class NetWMAdaptor; class GnomeWMAdaptor; }
 #define SHOWSTATE_NORMAL        1
 #define SHOWSTATE_HIDDEN        2
 
-class VCLPLUG_GEN_PUBLIC X11SalFrame : public SalFrame, public X11WindowProvider
+class VCLPLUG_GEN_PUBLIC X11SalFrame : public SalFrame, public NativeWindowHandleProvider
 {
     friend class vcl_sal::WMAdaptor;
     friend class vcl_sal::NetWMAdaptor;
@@ -261,7 +261,7 @@ public:
     // done setting up the clipregion
     virtual void                    EndSetClipRegion() override;
 
-    virtual Window GetX11Window() override;
+    virtual sal_uIntPtr         GetNativeWindowHandle() override;
 
     /// @internal
     void setPendingSizeEvent();
diff --git a/vcl/opengl/x11/gdiimpl.cxx b/vcl/opengl/x11/gdiimpl.cxx
index b1bc724c86ee..fc49e2520e58 100644
--- a/vcl/opengl/x11/gdiimpl.cxx
+++ b/vcl/opengl/x11/gdiimpl.cxx
@@ -47,12 +47,12 @@ void X11OpenGLSalGraphicsImpl::Init()
 
 rtl::Reference<OpenGLContext> X11OpenGLSalGraphicsImpl::CreateWinContext()
 {
-    X11WindowProvider *pProvider = dynamic_cast<X11WindowProvider*>(mrParent.m_pFrame);
+    NativeWindowHandleProvider *pProvider = dynamic_cast<NativeWindowHandleProvider*>(mrParent.m_pFrame);
 
     if( !pProvider )
         return nullptr;
 
-    Window aWin = pProvider->GetX11Window();
+    sal_uIntPtr aWin = pProvider->GetNativeWindowHandle();
     rtl::Reference<OpenGLContext> pContext = OpenGLContext::Create();
     pContext->setVCLOnly();
     pContext->init( mrParent.GetXDisplay(), aWin,
diff --git a/vcl/unx/generic/app/saldata.cxx b/vcl/unx/generic/app/saldata.cxx
index 3f9d184a5566..92f4679ae793 100644
--- a/vcl/unx/generic/app/saldata.cxx
+++ b/vcl/unx/generic/app/saldata.cxx
@@ -48,7 +48,9 @@
 #include "unx/sm.hxx"
 #include "unx/i18n_im.hxx"
 #include "unx/i18n_xkb.hxx"
-#include "unx/x11/x11display.hxx"
+#include <prex.h>
+#include <X11/Xproto.h>
+#include <postx.h>
 #include "salinst.hxx"
 
 #include <osl/signal.h>
@@ -374,6 +376,58 @@ SalXLib::~SalXLib()
     close (m_pTimeoutFDS[1]);
 }
 
+static Display *OpenX11Display(OString& rDisplay)
+{
+    /*
+     * open connection to X11 Display
+     * try in this order:
+     *  o  -display command line parameter,
+     *  o  $DISPLAY environment variable
+     *  o  default display
+     */
+
+    Display *pDisp = nullptr;
+
+    // is there a -display command line parameter?
+
+    sal_uInt32 nParams = osl_getCommandArgCount();
+    OUString aParam;
+    for (sal_uInt32 i=0; i<nParams; i++)
+    {
+        osl_getCommandArg(i, &aParam.pData);
+        if ( aParam == "-display" )
+        {
+            osl_getCommandArg(i+1, &aParam.pData);
+            rDisplay = OUStringToOString(
+                   aParam, osl_getThreadTextEncoding());
+
+            if ((pDisp = XOpenDisplay(rDisplay.getStr()))!=nullptr)
+            {
+                /*
+                 * if a -display switch was used, we need
+                 * to set the environment accordingly since
+                 * the clipboard build another connection
+                 * to the xserver using $DISPLAY
+                 */
+                OUString envVar("DISPLAY");
+                osl_setEnvironment(envVar.pData, aParam.pData);
+            }
+            break;
+        }
+    }
+
+    if (!pDisp && rDisplay.isEmpty())
+    {
+        // Open $DISPLAY or default...
+        char *pDisplay = getenv("DISPLAY");
+        if (pDisplay != nullptr)
+            rDisplay = OString(pDisplay);
+        pDisp  = XOpenDisplay(pDisplay);
+    }
+
+    return pDisp;
+}
+
 void SalXLib::Init()
 {
     SalI18N_InputMethod* pInputMethod = new SalI18N_InputMethod;
diff --git a/vcl/inc/unx/x11/x11display.hxx b/vcl/unx/generic/gdi/nativewindowhandleprovider.cxx
index 9cb2ea56ccf8..3afd26e31498 100644
--- a/vcl/inc/unx/x11/x11display.hxx
+++ b/vcl/unx/generic/gdi/nativewindowhandleprovider.cxx
@@ -7,19 +7,11 @@
  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
  */
 
-#ifndef INCLUDED_VCL_INC_UNX_X11_X11DISPLAY_HXX
-#define INCLUDED_VCL_INC_UNX_X11_X11DISPLAY_HXX
+#include "unx/nativewindowhandleprovider.hxx"
 
-#include <prex.h>
-#include <X11/Xproto.h>
-#include <postx.h>
+NativeWindowHandleProvider::~NativeWindowHandleProvider()
+{
+}
 
-#include <rtl/string.hxx>
-
-#include <vcl/dllapi.h>
-
-VCL_DLLPUBLIC Display* OpenX11Display(OString& rDisplay);
-
-#endif // INCLUDED_VCL_INC_UNX_X11_X11DISPLAY_HXX
 
 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/vcl/unx/generic/gdi/salgdi.cxx b/vcl/unx/generic/gdi/salgdi.cxx
index 738d59bf769c..f5ffead4beeb 100644
--- a/vcl/unx/generic/gdi/salgdi.cxx
+++ b/vcl/unx/generic/gdi/salgdi.cxx
@@ -53,7 +53,7 @@
 #include <unx/x11/xlimits.hxx>
 
 #include "salgdiimpl.hxx"
-#include "unx/x11windowprovider.hxx"
+#include "unx/nativewindowhandleprovider.hxx"
 #include "textrender.hxx"
 #include "gdiimpl.hxx"
 #include "opengl/x11/gdiimpl.hxx"
diff --git a/vcl/unx/generic/gdi/x11windowprovider.cxx b/vcl/unx/generic/gdi/x11windowprovider.cxx
deleted file mode 100644
index 5f7d289196ec..000000000000
--- a/vcl/unx/generic/gdi/x11windowprovider.cxx
+++ /dev/null
@@ -1,72 +0,0 @@
-/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
-/*
- * This file is part of the LibreOffice project.
- *
- * This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/.
- */
-
-#include <vcl/svapp.hxx>
-
-#include "unx/x11windowprovider.hxx"
-#include "unx/x11/x11display.hxx"
-
-X11WindowProvider::~X11WindowProvider()
-{
-}
-
-Display *OpenX11Display(OString& rDisplay)
-{
-    /*
-     * open connection to X11 Display
-     * try in this order:
-     *  o  -display command line parameter,
-     *  o  $DISPLAY environment variable
-     *  o  default display
-     */
-
-    Display *pDisp = nullptr;
-
-    // is there a -display command line parameter?
-
-    sal_uInt32 nParams = osl_getCommandArgCount();
-    OUString aParam;
-    for (sal_uInt32 i=0; i<nParams; i++)
-    {
-        osl_getCommandArg(i, &aParam.pData);
-        if ( aParam == "-display" )
-        {
-            osl_getCommandArg(i+1, &aParam.pData);
-            rDisplay = OUStringToOString(
-                   aParam, osl_getThreadTextEncoding());
-
-            if ((pDisp = XOpenDisplay(rDisplay.getStr()))!=nullptr)
-            {
-                /*
-                 * if a -display switch was used, we need
-                 * to set the environment accoringly since
-                 * the clipboard build another connection
-                 * to the xserver using $DISPLAY
-                 */
-                OUString envVar("DISPLAY");
-                osl_setEnvironment(envVar.pData, aParam.pData);
-            }
-            break;
-        }
-    }
-
-    if (!pDisp && rDisplay.isEmpty())
-    {
-        // Open $DISPLAY or default...
-        char *pDisplay = getenv("DISPLAY");
-        if (pDisplay != nullptr)
-            rDisplay = OString(pDisplay);
-        pDisp  = XOpenDisplay(pDisplay);
-    }
-
-    return pDisp;
-}
-
-
-/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/vcl/unx/generic/window/salframe.cxx b/vcl/unx/generic/window/salframe.cxx
index c0e3e75e36ec..63f7c9d68cd2 100644
--- a/vcl/unx/generic/window/salframe.cxx
+++ b/vcl/unx/generic/window/salframe.cxx
@@ -4133,7 +4133,7 @@ void X11SalFrame::EndSetClipRegion()
 
 }
 
-Window X11SalFrame::GetX11Window()
+sal_uIntPtr X11SalFrame::GetNativeWindowHandle()
 {
     return mhWindow;
 }
diff --git a/vcl/unx/gtk/gtkobject.cxx b/vcl/unx/gtk/gtkobject.cxx
index 35084aa4ef4e..18aa63a115c6 100644
--- a/vcl/unx/gtk/gtkobject.cxx
+++ b/vcl/unx/gtk/gtkobject.cxx
@@ -51,7 +51,6 @@ GtkSalObject::GtkSalObject( GtkSalFrame* pParent, bool bShow )
 
         // system data
         m_aSystemData.nSize         = sizeof( SystemEnvData );
-#if !GTK_CHECK_VERSION(3,0,0)
         SalDisplay* pDisp = vcl_sal::getSalDisplay(GetGenericData());
         m_aSystemData.pDisplay      = pDisp->GetDisplay();
         m_aSystemData.pVisual       = pDisp->GetVisual(pParent->getXScreenNumber()).GetVisual();
@@ -59,17 +58,12 @@ GtkSalObject::GtkSalObject( GtkSalFrame* pParent, bool bShow )
         m_aSystemData.aColormap     = pDisp->GetColormap(pParent->getXScreenNumber()).GetXColormap();
         m_aSystemData.aWindow       = GDK_WINDOW_XWINDOW(widget_get_window(m_pSocket));
         m_aSystemData.aShellWindow  = GDK_WINDOW_XWINDOW(widget_get_window(GTK_WIDGET(pParent->getWindow())));
-#else
-        static int nWindow = 0;
-        m_aSystemData.aWindow       = nWindow;
-        ++nWindow;
-        m_aSystemData.aShellWindow  = reinterpret_cast<long>(this);
-#endif
         m_aSystemData.pSalFrame     = nullptr;
         m_aSystemData.pWidget       = m_pSocket;
         m_aSystemData.nScreen       = pParent->getXScreenNumber().getXScreen();
         m_aSystemData.pAppContext   = nullptr;
         m_aSystemData.pShellWidget  = GTK_WIDGET(pParent->getWindow());
+        m_aSystemData.pToolkit      = "gtk2";
 
         g_signal_connect( G_OBJECT(m_pSocket), "button-press-event", G_CALLBACK(signalButton), this );
         g_signal_connect( G_OBJECT(m_pSocket), "button-release-event", G_CALLBACK(signalButton), this );
@@ -86,11 +80,7 @@ GtkSalObject::~GtkSalObject()
 {
     if( m_pRegion )
     {
-#if GTK_CHECK_VERSION(3,0,0)
-        cairo_region_destroy( m_pRegion );
-#else
         gdk_region_destroy( m_pRegion );
-#endif
     }
     if( m_pSocket )
     {
@@ -119,15 +109,9 @@ sal_uInt16 GtkSalObject::GetClipRegionType()
 
 void GtkSalObject::BeginSetClipRegion( sal_uLong )
 {
-#if GTK_CHECK_VERSION(3,0,0)
-    if( m_pRegion )
-        cairo_region_destroy( m_pRegion );
-    m_pRegion = cairo_region_create();
-#else
     if( m_pRegion )
         gdk_region_destroy( m_pRegion );
     m_pRegion = gdk_region_new();
-#endif
 }
 
 void GtkSalObject::UnionClipRegion( long nX, long nY, long nWidth, long nHeight )
@@ -138,11 +122,7 @@ void GtkSalObject::UnionClipRegion( long nX, long nY, long nWidth, long nHeight
     aRect.width     = nWidth;
     aRect.height    = nHeight;
 
-#if GTK_CHECK_VERSION(3,0,0)
-    cairo_region_union_rectangle( m_pRegion, &aRect );
-#else
     gdk_region_union_with_rect( m_pRegion, &aRect );
-#endif
 }
 
 void GtkSalObject::EndSetClipRegion()
diff --git a/vcl/unx/gtk/gtksalframe.cxx b/vcl/unx/gtk/gtksalframe.cxx
index 3b6caa6b3fd6..7a7c293273fb 100644
--- a/vcl/unx/gtk/gtksalframe.cxx
+++ b/vcl/unx/gtk/gtksalframe.cxx
@@ -1022,6 +1022,7 @@ void GtkSalFrame::InitCommon()
     m_aSystemData.nScreen       = m_nXScreen.getXScreen();
     m_aSystemData.pAppContext   = nullptr;
     m_aSystemData.pShellWidget  = m_aSystemData.pWidget;
+    m_aSystemData.pToolkit      = "gtk2";
 
     m_bGraphics = false;
     m_pGraphics = NULL;
@@ -3929,7 +3930,7 @@ Size GtkSalDisplay::GetScreenSize( int nDisplayScreen )
     return Size( aRect.GetWidth(), aRect.GetHeight() );
 }
 
-Window GtkSalFrame::GetX11Window()
+sal_uIntPtr GtkSalFrame::GetNativeWindowHandle()
 {
     return widget_get_xid(m_pWindow);
 }
diff --git a/vcl/unx/gtk3/gtk3gtkframe.cxx b/vcl/unx/gtk3/gtk3gtkframe.cxx
index 70e0c9b536ef..f3bdfb251b4c 100644
--- a/vcl/unx/gtk3/gtk3gtkframe.cxx
+++ b/vcl/unx/gtk3/gtk3gtkframe.cxx
@@ -48,7 +48,12 @@
 #include <gtk/gtk.h>
 #include <prex.h>
 #include <X11/Xatom.h>
-#include <gdk/gdkx.h>
+#if defined(GDK_WINDOWING_X11)
+#   include <gdk/gdkx.h>
+#endif
+#if defined(GDK_WINDOWING_WAYLAND)
+#   include <gdk/gdkwayland.h>
+#endif
 #include <postx.h>
 
 #include <dlfcn.h>
@@ -1085,15 +1090,14 @@ void GtkSalFrame::InitCommon()
 
     //system data
     m_aSystemData.nSize         = sizeof( SystemEnvData );
-    static int nWindow = 0;
-    m_aSystemData.aWindow       = nWindow;
-    ++nWindow;
+    m_aSystemData.aWindow       = GetNativeWindowHandle(m_pWindow);
     m_aSystemData.aShellWindow  = reinterpret_cast<long>(this);
     m_aSystemData.pSalFrame     = this;
     m_aSystemData.pWidget       = m_pWindow;
     m_aSystemData.nScreen       = m_nXScreen.getXScreen();
     m_aSystemData.pAppContext   = nullptr;
     m_aSystemData.pShellWidget  = m_aSystemData.pWidget;
+    m_aSystemData.pToolkit      = "gtk3";
 
     m_bGraphics = false;
     m_pGraphics = nullptr;
@@ -3926,9 +3930,30 @@ Size GtkSalDisplay::GetScreenSize( int nDisplayScreen )
     return Size( aRect.GetWidth(), aRect.GetHeight() );
 }
 
-Window GtkSalFrame::GetX11Window()
+sal_uIntPtr GtkSalFrame::GetNativeWindowHandle(GtkWidget *pWidget)
+{
+    (void) this;                // Silence loplugin:staticmethods
+    GdkDisplay *pDisplay = getGdkDisplay();
+    GdkWindow *pWindow = gtk_widget_get_window(pWidget);
+
+#if defined(GDK_WINDOWING_X11)
+    if (GDK_IS_X11_DISPLAY(pDisplay))
+    {
+        return GDK_WINDOW_XID(pWindow);
+    }
+#endif
+#if defined(GDK_WINDOWING_WAYLAND)
+    if (GDK_IS_WAYLAND_DISPLAY(pDisplay))
+    {
+        return reinterpret_cast<sal_uIntPtr>(gdk_wayland_window_get_wl_surface(pWindow));
+    }
+#endif
+    return 0;
+}
+
+sal_uIntPtr GtkSalFrame::GetNativeWindowHandle()
 {
-    return widget_get_xid(m_pWindow);
+    return GetNativeWindowHandle(m_pWindow);
 }
 
 void GtkDragSource::startDrag(const datatransfer::dnd::DragGestureEvent& rEvent,
diff --git a/vcl/unx/gtk3/gtk3gtkobject.cxx b/vcl/unx/gtk3/gtk3gtkobject.cxx
index 96c152726c58..8f1c032190db 100644
--- a/vcl/unx/gtk3/gtk3gtkobject.cxx
+++ b/vcl/unx/gtk3/gtk3gtkobject.cxx
@@ -5,8 +5,186 @@
  * This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  */
 
-#include "../gtk/gtkobject.cxx"
+#ifdef AIX
+#define _LINUX_SOURCE_COMPAT
+#include <sys/timer.h>
+#undef _LINUX_SOURCE_COMPAT
+#endif
+
+#include <unx/gtk/gtkobject.hxx>
+#include <unx/gtk/gtkframe.hxx>
+#include <unx/gtk/gtkdata.hxx>
+#include <unx/gtk/gtkinst.hxx>
+#include <unx/gtk/gtkgdi.hxx>
+
+GtkSalObject::GtkSalObject( GtkSalFrame* pParent, bool bShow )
+        : m_pSocket( nullptr ),
+          m_pRegion( nullptr )
+{
+    if( pParent )
+    {
+        // our plug window
+        m_pSocket = gtk_grid_new();
+        Show( bShow );
+        // insert into container
+        gtk_fixed_put( pParent->getFixedContainer(),
+                       m_pSocket,
+                       0, 0 );
+        // realize so we can get a window id
+        gtk_widget_realize( m_pSocket );
+
+        // system data
+        m_aSystemData.nSize         = sizeof( SystemEnvData );
+        m_aSystemData.aWindow       = pParent->GetNativeWindowHandle(m_pSocket);
+        m_aSystemData.aShellWindow  = reinterpret_cast<long>(this);
+        m_aSystemData.pSalFrame     = nullptr;
+        m_aSystemData.pWidget       = m_pSocket;
+        m_aSystemData.nScreen       = pParent->getXScreenNumber().getXScreen();
+        m_aSystemData.pAppContext   = nullptr;
+        m_aSystemData.pShellWidget  = GTK_WIDGET(pParent->getWindow());
+        m_aSystemData.pToolkit      = "gtk3";
+
+        g_signal_connect( G_OBJECT(m_pSocket), "button-press-event", G_CALLBACK(signalButton), this );
+        g_signal_connect( G_OBJECT(m_pSocket), "button-release-event", G_CALLBACK(signalButton), this );
+        g_signal_connect( G_OBJECT(m_pSocket), "focus-in-event", G_CALLBACK(signalFocus), this );
+        g_signal_connect( G_OBJECT(m_pSocket), "focus-out-event", G_CALLBACK(signalFocus), this );
+        g_signal_connect( G_OBJECT(m_pSocket), "destroy", G_CALLBACK(signalDestroy), this );
+
+        // #i59255# necessary due to sync effects with java child windows
+        pParent->Flush();
+    }
+}
+
+GtkSalObject::~GtkSalObject()
+{
+    if( m_pRegion )
+    {
+        cairo_region_destroy( m_pRegion );
+    }
+    if( m_pSocket )
+    {
+        // remove socket from parent frame's fixed container
+        gtk_container_remove( GTK_CONTAINER(gtk_widget_get_parent(m_pSocket)),
+                              m_pSocket );
+        // get rid of the socket
+        // actually the gtk_container_remove should let the ref count
+        // of the socket sink to 0 and destroy it (see signalDestroy)
+        // this is just a sanity check
+        if( m_pSocket )
+            gtk_widget_destroy( m_pSocket );
+    }
+}
+
+void GtkSalObject::ResetClipRegion()
+{
+    if( m_pSocket )
+        gdk_window_shape_combine_region( widget_get_window(m_pSocket), nullptr, 0, 0 );
+}
+
+sal_uInt16 GtkSalObject::GetClipRegionType()
+{
+    return SAL_OBJECT_CLIP_INCLUDERECTS;
+}
+
+void GtkSalObject::BeginSetClipRegion( sal_uLong )
+{
+    if( m_pRegion )
+        cairo_region_destroy( m_pRegion );
+    m_pRegion = cairo_region_create();
+}
+
+void GtkSalObject::UnionClipRegion( long nX, long nY, long nWidth, long nHeight )
+{
+    GdkRectangle aRect;
+    aRect.x         = nX;
+    aRect.y         = nY;
+    aRect.width     = nWidth;
+    aRect.height    = nHeight;
+
+    cairo_region_union_rectangle( m_pRegion, &aRect );
+}
+
+void GtkSalObject::EndSetClipRegion()
+{
+    if( m_pSocket )
+        gdk_window_shape_combine_region( widget_get_window(m_pSocket), m_pRegion, 0, 0 );
+}
+
+void GtkSalObject::SetPosSize( long nX, long nY, long nWidth, long nHeight )
+{
+    if( m_pSocket )
+    {
+        GtkFixed* pContainer = GTK_FIXED(gtk_widget_get_parent(m_pSocket));
+        gtk_fixed_move( pContainer, m_pSocket, nX, nY );
+        gtk_widget_set_size_request( m_pSocket, nWidth, nHeight );
+        gtk_container_resize_children( GTK_CONTAINER(pContainer) );
+    }
+}
+
+void GtkSalObject::Show( bool bVisible )
+{
+    if( m_pSocket )
+    {
+        if( bVisible )
+            gtk_widget_show( m_pSocket );
+        else
+            gtk_widget_hide( m_pSocket );
+    }
+}
+
+const SystemEnvData* GtkSalObject::GetSystemData() const
+{
+    return &m_aSystemData;
+}
+
+gboolean GtkSalObject::signalButton( GtkWidget*, GdkEventButton* pEvent, gpointer object )
+{
+    GtkSalObject* pThis = static_cast<GtkSalObject*>(object);
+
+    if( pEvent->type == GDK_BUTTON_PRESS )
+    {
+        pThis->CallCallback( SALOBJ_EVENT_TOTOP, nullptr );
+    }
+
+    return FALSE;
+}
+
+gboolean GtkSalObject::signalFocus( GtkWidget*, GdkEventFocus* pEvent, gpointer object )
+{
+    GtkSalObject* pThis = static_cast<GtkSalObject*>(object);
+
+    pThis->CallCallback( pEvent->in ? SALOBJ_EVENT_GETFOCUS : SALOBJ_EVENT_LOSEFOCUS, nullptr );
+
+    return FALSE;
+}
+
+void GtkSalObject::signalDestroy( GtkWidget* pObj, gpointer object )
+{
+    GtkSalObject* pThis = static_cast<GtkSalObject*>(object);
+    if( pObj == pThis->m_pSocket )
+    {
+        pThis->m_pSocket = nullptr;
+    }
+}
+
+void GtkSalObject::SetForwardKey( bool bEnable )
+{
+    if( bEnable )
+        gtk_widget_add_events( GTK_WIDGET( m_pSocket ), GDK_KEY_PRESS_MASK | GDK_KEY_RELEASE );
+    else
+        gtk_widget_set_events( GTK_WIDGET( m_pSocket ), ~(GDK_KEY_PRESS_MASK | GDK_KEY_RELEASE) & gtk_widget_get_events( GTK_WIDGET( m_pSocket ) ) );
+}
 
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