split NotifyingLayout out

Change-Id: Ib706331f9e6b3749559a0b78f1a07d442a674829
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/117369
Tested-by: Jenkins
Reviewed-by: Caolán McNamara <caolanm@redhat.com>

5 files changed, 128 insertions, 94 deletions

diff --git a/vcl/Library_vclplug_gtk4.mk b/vcl/Library_vclplug_gtk4.mk
index e3cc415be738..93f8d8c90673 100644
--- a/vcl/Library_vclplug_gtk4.mk
+++ b/vcl/Library_vclplug_gtk4.mk
@@ -96,6 +96,7 @@ $(eval $(call gb_Library_add_exception_objects,vclplug_gtk4,\
 	vcl/unx/gtk4/glomenu \
 	vcl/unx/gtk4/gloactiongroup \
     vcl/unx/gtk4/hudawareness \
+    vcl/unx/gtk4/notifyinglayout \
 ))
 
 ifeq ($(OS),LINUX)
diff --git a/vcl/unx/gtk3/gtkinst.cxx b/vcl/unx/gtk3/gtkinst.cxx
index 830cb067ddd7..3aec591a6a7a 100644
--- a/vcl/unx/gtk3/gtkinst.cxx
+++ b/vcl/unx/gtk3/gtkinst.cxx
@@ -7785,98 +7785,6 @@ public:
 
 }
 
-#if GTK_CHECK_VERSION(4, 0, 0)
-
-G_BEGIN_DECLS
-
-G_DECLARE_FINAL_TYPE(NotifyingLayout, notifying_layout, NOTIFYING, LAYOUT, GtkLayoutManager)
-
-struct _NotifyingLayout
-{
-    GtkLayoutManager parent_instance;
-
-    GtkWidget* m_pWidget;
-    GtkLayoutManager* m_pOrigManager;
-    Link<void*, void> m_aLink;
-
-    void StartWatch(GtkWidget* pWidget, const Link<void*, void>& rLink)
-    {
-        m_pWidget = pWidget;
-        m_aLink = rLink;
-
-        m_pOrigManager = gtk_widget_get_layout_manager(m_pWidget);
-        g_object_ref(m_pOrigManager);
-
-        gtk_widget_set_layout_manager(pWidget, GTK_LAYOUT_MANAGER(this));
-    }
-
-    void StopWatch()
-    {
-        gtk_widget_set_layout_manager(m_pWidget, m_pOrigManager);
-    }
-};
-
-struct _NotifyingLayoutClass
-{
-    GtkLayoutManagerClass parent_class;
-};
-
-G_DEFINE_TYPE(NotifyingLayout, notifying_layout, GTK_TYPE_LAYOUT_MANAGER)
-
-static void notifying_layout_measure(GtkLayoutManager* pLayoutManager,
-                                     GtkWidget* widget,
-                                     GtkOrientation orientation,
-                                     int for_size,
-                                     int *minimum,
-                                     int *natural,
-                                     int *minimum_baseline,
-                                     int *natural_baseline)
-{
-    NotifyingLayout* self = NOTIFYING_LAYOUT(pLayoutManager);
-    GtkLayoutManagerClass* pKlass = GTK_LAYOUT_MANAGER_CLASS(G_OBJECT_GET_CLASS(self->m_pOrigManager));
-    pKlass->measure(self->m_pOrigManager, widget, orientation, for_size,
-                    minimum, natural, minimum_baseline, natural_baseline);
-}
-
-static void notifying_layout_allocate(GtkLayoutManager* pLayoutManager,
-                                      GtkWidget* widget,
-                                      int width,
-                                      int height,
-                                      int baseline)
-{
-    NotifyingLayout* self = NOTIFYING_LAYOUT(pLayoutManager);
-    GtkLayoutManagerClass* pKlass = GTK_LAYOUT_MANAGER_CLASS(G_OBJECT_GET_CLASS(self->m_pOrigManager));
-    pKlass->allocate(self->m_pOrigManager, widget, width, height, baseline);
-    self->m_aLink.Call(nullptr);
-}
-
-static GtkSizeRequestMode notifying_layout_get_request_mode(GtkLayoutManager* pLayoutManager,
-                                                            GtkWidget* widget)
-{
-    NotifyingLayout* self = NOTIFYING_LAYOUT(pLayoutManager);
-    GtkLayoutManagerClass* pKlass = GTK_LAYOUT_MANAGER_CLASS(G_OBJECT_GET_CLASS(self->m_pOrigManager));
-    return pKlass->get_request_mode(self->m_pOrigManager, widget);
-}
-
-static void notifying_layout_class_init(NotifyingLayoutClass* klass)
-{
-    GtkLayoutManagerClass *layout_class = GTK_LAYOUT_MANAGER_CLASS(klass);
-
-    layout_class->get_request_mode = notifying_layout_get_request_mode;
-    layout_class->measure = notifying_layout_measure;
-    layout_class->allocate = notifying_layout_allocate;
-}
-
-static void notifying_layout_init(NotifyingLayout* self)
-{
-    self->m_pWidget = nullptr;
-    self->m_pOrigManager = nullptr;
-}
-
-G_END_DECLS
-
-#endif
-
 namespace {
 
 class GtkInstanceNotebook : public GtkInstanceWidget, public virtual weld::Notebook
@@ -8364,7 +8272,7 @@ public:
             m_nNotebookSizeAllocateSignalId = g_signal_connect_after(pNotebook, "size-allocate", G_CALLBACK(signalSizeAllocate), this);
 #else
             m_pLayout = NOTIFYING_LAYOUT(g_object_new(notifying_layout_get_type(), nullptr));
-            m_pLayout->StartWatch(GTK_WIDGET(pNotebook), LINK(this, GtkInstanceNotebook, SizeAllocateHdl));
+            notifying_layout_start_watch(m_pLayout, GTK_WIDGET(pNotebook), LINK(this, GtkInstanceNotebook, SizeAllocateHdl));
 #endif
         }
         gtk_notebook_set_show_border(m_pOverFlowNotebook, false);
@@ -8641,7 +8549,7 @@ public:
         if (m_pLayout)
         {
             // put it back how we found it initially
-            m_pLayout->StopWatch();
+            notifying_layout_stop_watch(m_pLayout);
         }
 #endif
         g_signal_handler_disconnect(m_pNotebook, m_nSwitchPageSignalId);
diff --git a/vcl/unx/gtk4/gtkinst.cxx b/vcl/unx/gtk4/gtkinst.cxx
index e166777412b0..4dc435a2bbf4 100644
--- a/vcl/unx/gtk4/gtkinst.cxx
+++ b/vcl/unx/gtk4/gtkinst.cxx
@@ -11,6 +11,7 @@
 #define GTK_TOOLKIT_NAME "gtk4"
 
 #include "convert3to4.hxx"
+#include "notifyinglayout.hxx"
 
 #include "../gtk3/gtkinst.cxx"
 
diff --git a/vcl/unx/gtk4/notifyinglayout.cxx b/vcl/unx/gtk4/notifyinglayout.cxx
new file mode 100644
index 000000000000..46b9a2d95f04
--- /dev/null
+++ b/vcl/unx/gtk4/notifyinglayout.cxx
@@ -0,0 +1,88 @@
+/* -*- 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 "notifyinglayout.hxx"
+
+struct _NotifyingLayout
+{
+    GtkLayoutManager parent_instance;
+
+    GtkWidget* m_pWidget;
+    GtkLayoutManager* m_pOrigManager;
+    Link<void*, void> m_aLink;
+};
+
+G_DEFINE_TYPE(NotifyingLayout, notifying_layout, GTK_TYPE_LAYOUT_MANAGER)
+
+static void notifying_layout_measure(GtkLayoutManager* pLayoutManager, GtkWidget* widget,
+                                     GtkOrientation orientation, int for_size, int* minimum,
+                                     int* natural, int* minimum_baseline, int* natural_baseline)
+{
+    NotifyingLayout* self = NOTIFYING_LAYOUT(pLayoutManager);
+    GtkLayoutManagerClass* pKlass
+        = GTK_LAYOUT_MANAGER_CLASS(G_OBJECT_GET_CLASS(self->m_pOrigManager));
+    pKlass->measure(self->m_pOrigManager, widget, orientation, for_size, minimum, natural,
+                    minimum_baseline, natural_baseline);
+}
+
+static void notifying_layout_allocate(GtkLayoutManager* pLayoutManager, GtkWidget* widget,
+                                      int width, int height, int baseline)
+{
+    NotifyingLayout* self = NOTIFYING_LAYOUT(pLayoutManager);
+    GtkLayoutManagerClass* pKlass
+        = GTK_LAYOUT_MANAGER_CLASS(G_OBJECT_GET_CLASS(self->m_pOrigManager));
+    pKlass->allocate(self->m_pOrigManager, widget, width, height, baseline);
+    self->m_aLink.Call(nullptr);
+}
+
+static GtkSizeRequestMode notifying_layout_get_request_mode(GtkLayoutManager* pLayoutManager,
+                                                            GtkWidget* widget)
+{
+    NotifyingLayout* self = NOTIFYING_LAYOUT(pLayoutManager);
+    GtkLayoutManagerClass* pKlass
+        = GTK_LAYOUT_MANAGER_CLASS(G_OBJECT_GET_CLASS(self->m_pOrigManager));
+    return pKlass->get_request_mode(self->m_pOrigManager, widget);
+}
+
+static void notifying_layout_class_init(NotifyingLayoutClass* klass)
+{
+    GtkLayoutManagerClass* layout_class = GTK_LAYOUT_MANAGER_CLASS(klass);
+
+    layout_class->get_request_mode = notifying_layout_get_request_mode;
+    layout_class->measure = notifying_layout_measure;
+    layout_class->allocate = notifying_layout_allocate;
+}
+
+static void notifying_layout_init(NotifyingLayout* self)
+{
+    self->m_pWidget = nullptr;
+    self->m_pOrigManager = nullptr;
+
+    // prevent loplugin:unreffun firing on macro generated function
+    (void)notifying_layout_get_instance_private(self);
+}
+
+void notifying_layout_start_watch(NotifyingLayout* self, GtkWidget* pWidget,
+                                  const Link<void*, void>& rLink)
+{
+    self->m_pWidget = pWidget;
+    self->m_aLink = rLink;
+
+    self->m_pOrigManager = gtk_widget_get_layout_manager(self->m_pWidget);
+    g_object_ref(self->m_pOrigManager);
+
+    gtk_widget_set_layout_manager(pWidget, GTK_LAYOUT_MANAGER(self));
+}
+
+void notifying_layout_stop_watch(NotifyingLayout* self)
+{
+    gtk_widget_set_layout_manager(self->m_pWidget, self->m_pOrigManager);
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/vcl/unx/gtk4/notifyinglayout.hxx b/vcl/unx/gtk4/notifyinglayout.hxx
new file mode 100644
index 000000000000..a717a3061310
--- /dev/null
+++ b/vcl/unx/gtk4/notifyinglayout.hxx
@@ -0,0 +1,36 @@
+/* -*- 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/.
+ */
+
+#pragma once
+
+#include <gtk/gtk.h>
+#include <tools/link.hxx>
+
+G_BEGIN_DECLS
+
+G_DECLARE_FINAL_TYPE(NotifyingLayout, notifying_layout, NOTIFYING, LAYOUT, GtkLayoutManager)
+
+/*
+   Replace the existing GtkLayoutManager of pWidget with pLayout instead which will
+   forward all requests to the original GtkLayoutManager but additionally call
+   rLink when a size is allocated to the pWidget.
+
+   This provides a workaround for the removal of the size-allocate signal in gtk4
+*/
+void notifying_layout_start_watch(NotifyingLayout* pLayout, GtkWidget* pWidget,
+                                  const Link<void*, void>& rLink);
+
+/*
+   Undo a previous notifying_layout_start_watch.
+*/
+void notifying_layout_stop_watch(NotifyingLayout* pLayout);
+
+G_END_DECLS
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */