Resolves: tdf#92293 gtk3: get a11y working

(cherry picked from commit 093d7b81)

Change-Id: I89cfde9b4c97852d36817b716ac08bd32096915b

vcl/inc/unx/gtk/gtkframe.hxx

@@ -471,6 +471,7 @@ public:
 extern "C" {
 
 GType ooo_fixed_get_type();
+AtkObject* ooo_fixed_get_accessible(GtkWidget *obj);
 
 } // extern "C"
 

vcl/unx/gtk/a11y/atkbridge.cxx

@@ -27,7 +27,6 @@
 
 bool InitAtkBridge()
 {
-#if !GTK_CHECK_VERSION(3,0,0)
     const char* pVersion = atk_get_toolkit_version();
     if( ! pVersion )
         return false;
@@ -57,16 +56,13 @@ bool InitAtkBridge()
     AtkRegistry * registry = atk_get_default_registry();
     if( registry )
         atk_registry_set_factory_type( registry, OOO_TYPE_FIXED, OOO_TYPE_WRAPPER_FACTORY );
-#endif
 
     return true;
 }
 
 void DeInitAtkBridge()
 {
-#if !GTK_CHECK_VERSION(3,0,0)
     restore_gail_window_vtable();
-#endif
 }
 
 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */

vcl/unx/gtk/a11y/atkfactory.cxx

@@ -140,6 +140,11 @@ wrapper_factory_create_accessible( GObject *obj )
     return NULL;
 }
 
+AtkObject* ooo_fixed_get_accessible(GtkWidget *obj)
+{
+    return wrapper_factory_create_accessible(G_OBJECT(obj));
+}
+
 static void
 wrapper_factory_class_init( AtkObjectFactoryClass *klass )
 {

vcl/unx/gtk/window/gtksalframe.cxx

@@ -971,6 +971,17 @@ void GtkSalFrame::resizeWindow( long nWidth, long nHeight )
         window_resize(nWidth, nHeight);
 }
 
+#if GTK_CHECK_VERSION(3,2,0)
+
+static void
+ooo_fixed_class_init(GtkFixedClass *klass)
+{
+    GtkWidgetClass *widget_class = GTK_WIDGET_CLASS(klass);
+    widget_class->get_accessible = ooo_fixed_get_accessible;
+}
+
+#endif
+
 /*
  * Always use a sub-class of GtkFixed we can tag for a11y. This allows us to
  * utilize GAIL for the toplevel window and toolkit implementation incl.
@@ -986,10 +997,14 @@ ooo_fixed_get_type()
         static const GTypeInfo tinfo =
         {
             sizeof (GtkFixedClass),
-            (GBaseInitFunc) NULL,      /* base init */
-            (GBaseFinalizeFunc) NULL,  /* base finalize */
-            (GClassInitFunc) NULL,     /* class init */
-            (GClassFinalizeFunc) NULL, /* class finalize */
+            nullptr,      /* base init */
+            nullptr,  /* base finalize */
+#if GTK_CHECK_VERSION(3,2,0)
+            reinterpret_cast<GClassInitFunc>(ooo_fixed_class_init), /* class init */
+#else
+            nullptr,     /* class init */
+#endif
+            nullptr, /* class finalize */
             NULL,                      /* class data */
             sizeof (GtkFixed),         /* instance size */
             0,                         /* nb preallocs */