Adding upstream version 4:24.2.0.upstream/4%24.2.0

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 611 insertions, 0 deletions

diff --git a/vcl/unx/gtk3/gtkobject.cxx b/vcl/unx/gtk3/gtkobject.cxx
new file mode 100644
index 0000000000..bd553137a8
--- /dev/null
+++ b/vcl/unx/gtk3/gtkobject.cxx
@@ -0,0 +1,611 @@
+/* -*- 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/.
+ *
+ * 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 <unx/gtk/gtkbackend.hxx>
+#include <unx/gtk/gtkobject.hxx>
+#include <unx/gtk/gtkframe.hxx>
+#include <unx/gtk/gtkdata.hxx>
+#include <vcl/event.hxx>
+
+GtkSalObjectBase::GtkSalObjectBase(GtkSalFrame* pParent)
+    : m_pSocket(nullptr)
+    , m_pParent(pParent)
+    , m_pRegion(nullptr)
+{
+}
+
+GtkSalObject::GtkSalObject(GtkSalFrame* pParent, bool bShow)
+    : GtkSalObjectBase(pParent)
+{
+    if (!m_pParent)
+        return;
+
+    // our plug window
+    m_pSocket = gtk_grid_new();
+    Show( bShow );
+    // insert into container
+    gtk_fixed_put( pParent->getFixedContainer(),
+                   m_pSocket,
+                   0, 0 );
+
+    Init();
+
+    g_signal_connect( G_OBJECT(m_pSocket), "destroy", G_CALLBACK(signalDestroy), this );
+
+    // #i59255# necessary due to sync effects with java child windows
+    pParent->Flush();
+}
+
+void GtkSalObjectBase::Init()
+{
+    // realize so we can get a window id
+    gtk_widget_realize( m_pSocket );
+
+    // system data
+    // tdf#139609 deliberately defer using m_pParent->GetNativeWindowHandle(m_pSocket)) to set m_aSystemData.aWindow
+    // unless its explicitly needed
+    m_aSystemData.aShellWindow  = reinterpret_cast<sal_IntPtr>(this);
+    m_aSystemData.pSalFrame     = nullptr;
+    m_aSystemData.pWidget       = m_pSocket;
+    m_aSystemData.nScreen       = m_pParent->getXScreenNumber().getXScreen();
+    m_aSystemData.toolkit       = SystemEnvData::Toolkit::Gtk;
+#if !GTK_CHECK_VERSION(4, 0, 0)
+    GdkScreen* pScreen = gtk_widget_get_screen(m_pParent->getWindow());
+    GdkVisual* pVisual = gdk_screen_get_system_visual(pScreen);
+
+#if defined(GDK_WINDOWING_X11)
+    GdkDisplay *pDisplay = GtkSalFrame::getGdkDisplay();
+    if (DLSYM_GDK_IS_X11_DISPLAY(pDisplay))
+    {
+        m_aSystemData.pDisplay = gdk_x11_display_get_xdisplay(pDisplay);
+        m_aSystemData.pVisual = gdk_x11_visual_get_xvisual(pVisual);
+        m_aSystemData.platform = SystemEnvData::Platform::Xcb;
+    }
+#endif
+#if defined(GDK_WINDOWING_WAYLAND)
+    if (DLSYM_GDK_IS_WAYLAND_DISPLAY(pDisplay))
+    {
+        m_aSystemData.pDisplay = gdk_wayland_display_get_wl_display(pDisplay);
+        m_aSystemData.platform = SystemEnvData::Platform::Wayland;
+    }
+#endif
+
+    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 );
+#endif
+}
+
+GtkSalObjectBase::~GtkSalObjectBase()
+{
+    if( m_pRegion )
+    {
+        cairo_region_destroy( m_pRegion );
+    }
+}
+
+GtkSalObject::~GtkSalObject()
+{
+    if( !m_pSocket )
+        return;
+
+#if GTK_CHECK_VERSION(4, 0, 0)
+    gtk_widget_unparent(m_pSocket);
+#else
+    // 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 );
+#endif
+}
+
+void GtkSalObject::ResetClipRegion()
+{
+#if !GTK_CHECK_VERSION(4, 0, 0)
+    if( m_pSocket )
+        gdk_window_shape_combine_region( widget_get_surface(m_pSocket), nullptr, 0, 0 );
+#endif
+}
+
+void GtkSalObjectBase::BeginSetClipRegion( sal_uInt32 )
+{
+    if (m_pRegion)
+        cairo_region_destroy(m_pRegion);
+    m_pRegion = cairo_region_create();
+}
+
+void GtkSalObjectBase::UnionClipRegion( tools::Long nX, tools::Long nY, tools::Long nWidth, tools::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 !GTK_CHECK_VERSION(4, 0, 0)
+    if( m_pSocket )
+        gdk_window_shape_combine_region( widget_get_surface(m_pSocket), m_pRegion, 0, 0 );
+#endif
+}
+
+void GtkSalObject::SetPosSize(tools::Long nX, tools::Long nY, tools::Long nWidth, tools::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 );
+#if !GTK_CHECK_VERSION(4, 0, 0)
+        m_pParent->nopaint_container_resize_children(GTK_CONTAINER(pContainer));
+#endif
+    }
+}
+
+void GtkSalObject::Reparent(SalFrame* pFrame)
+{
+    GtkSalFrame* pNewParent = static_cast<GtkSalFrame*>(pFrame);
+    if (m_pSocket)
+    {
+        GtkFixed* pContainer = GTK_FIXED(gtk_widget_get_parent(m_pSocket));
+
+#if !GTK_CHECK_VERSION(4, 0, 0)
+        gint nX(0), nY(0);
+        gtk_container_child_get(GTK_CONTAINER(pContainer), m_pSocket,
+                "x", &nX,
+                "y", &nY,
+                nullptr);
+#else
+        double nX(0), nY(0);
+        gtk_fixed_get_child_position(pContainer, m_pSocket, &nX, &nY);
+#endif
+
+        g_object_ref(m_pSocket);
+#if !GTK_CHECK_VERSION(4, 0, 0)
+        gtk_container_remove(GTK_CONTAINER(pContainer), m_pSocket);
+#else
+        gtk_fixed_remove(pContainer, m_pSocket);
+#endif
+
+        gtk_fixed_put(pNewParent->getFixedContainer(),
+                      m_pSocket,
+                      nX, nY);
+
+        g_object_unref(m_pSocket);
+    }
+    m_pParent = pNewParent;
+}
+
+void GtkSalObject::Show( bool bVisible )
+{
+    if( m_pSocket )
+    {
+        if( bVisible )
+            gtk_widget_show(m_pSocket);
+        else
+            gtk_widget_hide(m_pSocket);
+    }
+}
+
+Size GtkSalObjectBase::GetOptimalSize() const
+{
+    if (m_pSocket)
+    {
+        bool bVisible = gtk_widget_get_visible(m_pSocket);
+        if (!bVisible)
+            gtk_widget_set_visible(m_pSocket, true);
+
+        // Undo SetPosSize before getting its preferred size
+        gint width(-1), height(-1);
+        gtk_widget_get_size_request(m_pSocket, &width, &height);
+        gtk_widget_set_size_request(m_pSocket, -1, -1);
+
+        GtkRequisition size;
+        gtk_widget_get_preferred_size(m_pSocket, nullptr, &size);
+
+        // Restore SetPosSize size
+        gtk_widget_set_size_request(m_pSocket, width, height);
+
+        if (!bVisible)
+            gtk_widget_set_visible(m_pSocket, false);
+        return Size(size.width, size.height);
+    }
+    return Size();
+}
+
+const SystemEnvData* GtkSalObjectBase::GetSystemData() const
+{
+    return &m_aSystemData;
+}
+
+#if !GTK_CHECK_VERSION(4, 0, 0)
+gboolean GtkSalObjectBase::signalButton( GtkWidget*, GdkEventButton* pEvent, gpointer object )
+{
+    GtkSalObjectBase* pThis = static_cast<GtkSalObject*>(object);
+
+    if( pEvent->type == GDK_BUTTON_PRESS )
+    {
+        pThis->CallCallback( SalObjEvent::ToTop );
+    }
+
+    return FALSE;
+}
+
+gboolean GtkSalObjectBase::signalFocus( GtkWidget*, GdkEventFocus* pEvent, gpointer object )
+{
+    GtkSalObjectBase* pThis = static_cast<GtkSalObject*>(object);
+
+    pThis->CallCallback( pEvent->in ? SalObjEvent::GetFocus : SalObjEvent::LoseFocus );
+
+    return FALSE;
+}
+#endif
+
+void GtkSalObject::signalDestroy( GtkWidget* pObj, gpointer object )
+{
+    GtkSalObject* pThis = static_cast<GtkSalObject*>(object);
+    if( pObj == pThis->m_pSocket )
+    {
+        pThis->m_pSocket = nullptr;
+    }
+}
+
+void GtkSalObjectBase::SetForwardKey( bool bEnable )
+{
+#if !GTK_CHECK_VERSION(4, 0, 0)
+    if( bEnable )
+        gtk_widget_add_events( GTK_WIDGET( m_pSocket ), GDK_KEY_PRESS_MASK | GDK_KEY_RELEASE_MASK );
+    else
+        gtk_widget_set_events( GTK_WIDGET( m_pSocket ), ~(GDK_KEY_PRESS_MASK | GDK_KEY_RELEASE_MASK) & gtk_widget_get_events( GTK_WIDGET( m_pSocket ) ) );
+#else
+    (void)bEnable;
+#endif
+}
+
+GtkSalObjectWidgetClip::GtkSalObjectWidgetClip(GtkSalFrame* pParent, bool bShow)
+    : GtkSalObjectBase(pParent)
+    , m_pScrolledWindow(nullptr)
+    , m_pViewPort(nullptr)
+    , m_pBgCssProvider(nullptr)
+{
+    if( !pParent )
+        return;
+
+#if !GTK_CHECK_VERSION(4, 0, 0)
+    m_pScrolledWindow = gtk_scrolled_window_new(nullptr, nullptr);
+    g_signal_connect(m_pScrolledWindow, "scroll-event", G_CALLBACK(signalScroll), this);
+#else
+    m_pScrolledWindow = gtk_scrolled_window_new();
+    GtkEventController* pScrollController = gtk_event_controller_scroll_new(GTK_EVENT_CONTROLLER_SCROLL_BOTH_AXES);
+    g_signal_connect(pScrollController, "scroll", G_CALLBACK(signalScroll), this);
+    gtk_widget_add_controller(m_pScrolledWindow, pScrollController);
+#endif
+    gtk_scrolled_window_set_policy(GTK_SCROLLED_WINDOW(m_pScrolledWindow),
+                                   GTK_POLICY_EXTERNAL, GTK_POLICY_EXTERNAL);
+
+    // insert into container
+    gtk_fixed_put( pParent->getFixedContainer(),
+                   m_pScrolledWindow,
+                   0, 0 );
+
+    // deliberately without adjustments to avoid gtk's auto adjustment on changing focus
+    m_pViewPort = gtk_viewport_new(nullptr, nullptr);
+
+    // force in a fake background of a suitable color
+    SetViewPortBackground();
+
+    ImplGetDefaultWindow()->AddEventListener(LINK(this, GtkSalObjectWidgetClip, SettingsChangedHdl));
+
+#if !GTK_CHECK_VERSION(4, 0, 0)
+    gtk_container_add(GTK_CONTAINER(m_pScrolledWindow), m_pViewPort);
+#else
+    gtk_scrolled_window_set_child(GTK_SCROLLED_WINDOW(m_pScrolledWindow), m_pViewPort);
+#endif
+    gtk_widget_show(m_pViewPort);
+
+    // our plug window
+    m_pSocket = gtk_grid_new();
+#if !GTK_CHECK_VERSION(4, 0, 0)
+    gtk_container_add(GTK_CONTAINER(m_pViewPort), m_pSocket);
+#else
+    gtk_viewport_set_child(GTK_VIEWPORT(m_pViewPort), m_pSocket);
+#endif
+    gtk_widget_show(m_pSocket);
+
+    Show(bShow);
+
+    Init();
+
+    g_signal_connect( G_OBJECT(m_pSocket), "destroy", G_CALLBACK(signalDestroy), this );
+}
+
+// force in a fake background of a suitable color
+void GtkSalObjectWidgetClip::SetViewPortBackground()
+{
+    GtkStyleContext *pWidgetContext = gtk_widget_get_style_context(m_pViewPort);
+    if (m_pBgCssProvider)
+        gtk_style_context_remove_provider(pWidgetContext, GTK_STYLE_PROVIDER(m_pBgCssProvider));
+    m_pBgCssProvider = gtk_css_provider_new();
+    OUString sColor = Application::GetSettings().GetStyleSettings().GetDialogColor().AsRGBHexString();
+    OUString aBuffer = "* { background-color: #" + sColor + "; }";
+    OString aResult = OUStringToOString(aBuffer, RTL_TEXTENCODING_UTF8);
+    css_provider_load_from_data(m_pBgCssProvider, aResult.getStr(), aResult.getLength());
+    gtk_style_context_add_provider(pWidgetContext, GTK_STYLE_PROVIDER(m_pBgCssProvider),
+                                   GTK_STYLE_PROVIDER_PRIORITY_APPLICATION);
+}
+
+IMPL_LINK(GtkSalObjectWidgetClip, SettingsChangedHdl, VclWindowEvent&, rEvent, void)
+{
+    if (rEvent.GetId() != VclEventId::WindowDataChanged)
+        return;
+
+    DataChangedEvent* pData = static_cast<DataChangedEvent*>(rEvent.GetData());
+    if (pData->GetType() == DataChangedEventType::SETTINGS)
+        SetViewPortBackground();
+}
+
+GtkSalObjectWidgetClip::~GtkSalObjectWidgetClip()
+{
+    ImplGetDefaultWindow()->RemoveEventListener(LINK(this, GtkSalObjectWidgetClip, SettingsChangedHdl));
+
+    if( !m_pSocket )
+        return;
+
+    // remove socket from parent frame's fixed container
+#if !GTK_CHECK_VERSION(4, 0, 0)
+    gtk_container_remove( GTK_CONTAINER(gtk_widget_get_parent(m_pScrolledWindow)),
+                          m_pScrolledWindow );
+
+    // 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_pScrolledWindow )
+        gtk_widget_destroy( m_pScrolledWindow );
+#else
+    gtk_fixed_remove(GTK_FIXED(gtk_widget_get_parent(m_pScrolledWindow)),
+                     m_pScrolledWindow);
+#endif
+}
+
+void GtkSalObjectWidgetClip::ResetClipRegion()
+{
+    m_aClipRect = tools::Rectangle();
+    ApplyClipRegion();
+}
+
+void GtkSalObjectWidgetClip::EndSetClipRegion()
+{
+    int nRects = cairo_region_num_rectangles(m_pRegion);
+    assert(nRects == 0 || nRects == 1);
+    if (nRects == 0)
+        m_aClipRect = tools::Rectangle();
+    else
+    {
+        cairo_rectangle_int_t rectangle;
+        cairo_region_get_rectangle(m_pRegion, 0, &rectangle);
+        m_aClipRect = tools::Rectangle(Point(rectangle.x, rectangle.y), Size(rectangle.width, rectangle.height));
+    }
+    ApplyClipRegion();
+}
+
+void GtkSalObjectWidgetClip::ApplyClipRegion()
+{
+    if( !m_pSocket )
+        return;
+
+    GtkFixed* pContainer = GTK_FIXED(gtk_widget_get_parent(m_pScrolledWindow));
+
+    GtkAllocation allocation;
+    allocation.x = m_aRect.Left() + m_aClipRect.Left();
+    allocation.y = m_aRect.Top() + m_aClipRect.Top();
+    if (m_aClipRect.IsEmpty())
+    {
+        allocation.width = m_aRect.GetWidth();
+        allocation.height = m_aRect.GetHeight();
+    }
+    else
+    {
+        allocation.width = m_aClipRect.GetWidth();
+        allocation.height = m_aClipRect.GetHeight();
+    }
+
+    if (AllSettings::GetLayoutRTL())
+    {
+        GtkAllocation aParentAllocation;
+        gtk_widget_get_allocation(GTK_WIDGET(pContainer), &aParentAllocation);
+        gtk_fixed_move(pContainer, m_pScrolledWindow, aParentAllocation.width - allocation.width - 1 - allocation.x, allocation.y);
+    }
+    else
+        gtk_fixed_move(pContainer, m_pScrolledWindow, allocation.x, allocation.y);
+    gtk_widget_set_size_request(m_pScrolledWindow, allocation.width, allocation.height);
+#if !GTK_CHECK_VERSION(4, 0, 0)
+    gtk_widget_size_allocate(m_pScrolledWindow, &allocation);
+#else
+    gtk_widget_size_allocate(m_pScrolledWindow, &allocation, 0);
+#endif
+
+    gtk_adjustment_set_value(gtk_scrolled_window_get_hadjustment(GTK_SCROLLED_WINDOW(m_pScrolledWindow)), m_aClipRect.Left());
+    gtk_adjustment_set_value(gtk_scrolled_window_get_vadjustment(GTK_SCROLLED_WINDOW(m_pScrolledWindow)), m_aClipRect.Top());
+}
+
+void GtkSalObjectWidgetClip::SetPosSize(tools::Long nX, tools::Long nY, tools::Long nWidth, tools::Long nHeight)
+{
+    m_aRect = tools::Rectangle(Point(nX, nY), Size(nWidth, nHeight));
+    if (m_pSocket)
+    {
+#if !GTK_CHECK_VERSION(4, 0, 0)
+        GtkFixed* pContainer = GTK_FIXED(gtk_widget_get_parent(m_pScrolledWindow));
+#endif
+        gtk_widget_set_size_request(m_pSocket, nWidth, nHeight);
+        ApplyClipRegion();
+#if !GTK_CHECK_VERSION(4, 0, 0)
+        m_pParent->nopaint_container_resize_children(GTK_CONTAINER(pContainer));
+#endif
+    }
+}
+
+void GtkSalObjectWidgetClip::Reparent(SalFrame* pFrame)
+{
+    GtkSalFrame* pNewParent = static_cast<GtkSalFrame*>(pFrame);
+    if (m_pSocket)
+    {
+        GtkFixed* pContainer = GTK_FIXED(gtk_widget_get_parent(m_pScrolledWindow));
+
+#if !GTK_CHECK_VERSION(4, 0, 0)
+        gint nX(0), nY(0);
+        gtk_container_child_get(GTK_CONTAINER(pContainer), m_pScrolledWindow,
+                "x", &nX,
+                "y", &nY,
+                nullptr);
+#else
+        double nX(0), nY(0);
+        gtk_fixed_get_child_position(pContainer, m_pScrolledWindow, &nX, &nY);
+#endif
+
+        g_object_ref(m_pScrolledWindow);
+#if !GTK_CHECK_VERSION(4, 0, 0)
+        gtk_container_remove(GTK_CONTAINER(pContainer), m_pScrolledWindow);
+#else
+        gtk_fixed_remove(pContainer, m_pScrolledWindow);
+#endif
+
+        gtk_fixed_put(pNewParent->getFixedContainer(),
+                      m_pScrolledWindow,
+                      nX, nY);
+
+        g_object_unref(m_pScrolledWindow);
+    }
+    m_pParent = pNewParent;
+}
+
+void GtkSalObjectWidgetClip::Show( bool bVisible )
+{
+    if (!m_pSocket)
+        return;
+    bool bCurrentVis = gtk_widget_get_visible(m_pScrolledWindow);
+    if (bVisible == bCurrentVis)
+        return;
+    if( bVisible )
+    {
+        gtk_widget_show(m_pScrolledWindow);
+        // tdf#146641 allocations attempted while hidden are discarded by gtk,
+        // so on transition to visible ApplyClipRegion needs to be called
+        ApplyClipRegion();
+    }
+    else
+    {
+        // on hiding the widget, if a child has focus gtk will want to move the focus out of the widget
+        // but we want to keep the focus where it is, e.g. writer's comments in margin feature put
+        // cursor in a sidebar comment and scroll the page so the comment is invisible, we want the focus
+        // to stay in the invisible widget, so its there when we scroll back or on a keypress the widget
+        // gets the keystroke and scrolls back to make it visible again
+        GtkWidget* pTopLevel = widget_get_toplevel(m_pScrolledWindow);
+        GtkWidget* pOldFocus = GTK_IS_WINDOW(pTopLevel) ? gtk_window_get_focus(GTK_WINDOW(pTopLevel)) : nullptr;
+
+        g_object_set_data(G_OBJECT(pTopLevel), "g-lo-BlockFocusChange", GINT_TO_POINTER(true) );
+
+        gtk_widget_hide(m_pScrolledWindow);
+
+        GtkWidget* pNewFocus = GTK_IS_WINDOW(pTopLevel) ? gtk_window_get_focus(GTK_WINDOW(pTopLevel)) : nullptr;
+        if (pOldFocus && pOldFocus != pNewFocus)
+            gtk_widget_grab_focus(pOldFocus);
+
+        g_object_set_data(G_OBJECT(pTopLevel), "g-lo-BlockFocusChange", GINT_TO_POINTER(false) );
+    }
+}
+
+void GtkSalObjectWidgetClip::signalDestroy( GtkWidget* pObj, gpointer object )
+{
+    GtkSalObjectWidgetClip* pThis = static_cast<GtkSalObjectWidgetClip*>(object);
+    if( pObj == pThis->m_pSocket )
+    {
+        pThis->m_pSocket = nullptr;
+        pThis->m_pScrolledWindow = nullptr;
+    }
+}
+
+#if !GTK_CHECK_VERSION(4, 0, 0)
+gboolean GtkSalObjectWidgetClip::signalScroll(GtkWidget* pScrolledWindow, GdkEvent* pEvent, gpointer object)
+{
+    GtkSalObjectWidgetClip* pThis = static_cast<GtkSalObjectWidgetClip*>(object);
+    return pThis->signal_scroll(pScrolledWindow, pEvent);
+}
+#else
+gboolean GtkSalObjectWidgetClip::signalScroll(GtkEventControllerScroll* pController, double delta_x, double delta_y, gpointer object)
+{
+    GtkSalObjectWidgetClip* pThis = static_cast<GtkSalObjectWidgetClip*>(object);
+    return pThis->signal_scroll(pController, delta_x, delta_y);
+}
+#endif
+
+// forward the wheel scroll events onto the main window instead
+#if !GTK_CHECK_VERSION(4, 0, 0)
+bool GtkSalObjectWidgetClip::signal_scroll(GtkWidget*, GdkEvent* pEvent)
+{
+    GtkWidget* pEventWidget = gtk_get_event_widget(pEvent);
+
+    GtkWidget* pMouseEventWidget = m_pParent->getMouseEventWidget();
+
+    gtk_coord dest_x, dest_y;
+    gtk_widget_translate_coordinates(pEventWidget,
+                                     pMouseEventWidget,
+                                     pEvent->scroll.x,
+                                     pEvent->scroll.y,
+                                     &dest_x,
+                                     &dest_y);
+    pEvent->scroll.x = dest_x;
+    pEvent->scroll.y = dest_y;
+
+    GtkSalFrame::signalScroll(pMouseEventWidget, pEvent, m_pParent);
+    return true;
+}
+#else
+bool GtkSalObjectWidgetClip::signal_scroll(GtkEventControllerScroll* pController, double delta_x, double delta_y)
+{
+    GtkWidget* pEventWidget = m_pScrolledWindow;
+
+    GtkWidget* pMouseEventWidget = m_pParent->getMouseEventWidget();
+
+    gtk_coord dest_x, dest_y;
+    gtk_widget_translate_coordinates(pEventWidget,
+                                     pMouseEventWidget,
+                                     delta_x,
+                                     delta_y,
+                                     &dest_x,
+                                     &dest_y);
+    delta_x = dest_x;
+    delta_y = dest_y;
+
+    GtkSalFrame::signalScroll(pController, delta_x, delta_y, m_pParent);
+    return true;
+}
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */