actionbar: Add explicit center widget

The center widget in GtkBox was only introduced to use it in
GtkActionBar. However, the implementation there is much more complex
than it needs to be, so move the center widget into GtkActionBar instead
and later remove it from GtkBox.

5 files changed, 441 insertions, 33 deletions

diff --git a/gtk/Makefile.am b/gtk/Makefile.am
index f66e20b4c5..df660307e8 100644
--- a/gtk/Makefile.am
+++ b/gtk/Makefile.am
@@ -576,7 +576,8 @@ gtk_private_h_sources =		\
 	gtkwindowprivate.h	\
 	gtktreemenu.h		\
 	gdkpixbufutilsprivate.h \
-	gtkgizmoprivate.h
+	gtkgizmoprivate.h \
+	gtkcenterboxprivate.h
 
 # GTK+ C sources to build the library from
 gtk_base_c_sources = 		\
@@ -939,7 +940,8 @@ gtk_base_c_sources = 		\
 	gtkwin32draw.c		\
 	gtkwin32theme.c		\
 	gdkpixbufutils.c 	\
-	gtkgizmo.c
+	gtkgizmo.c 		\
+	gtkcenterbox.c
 
 if USE_QUARTZ
 gtk_base_c_sources += 		\
diff --git a/gtk/gtkactionbar.c b/gtk/gtkactionbar.c
index bc06fbd623..85506eaefd 100644
--- a/gtk/gtkactionbar.c
+++ b/gtk/gtkactionbar.c
@@ -30,6 +30,7 @@
 #include "gtkwidgetprivate.h"
 #include "gtkcontainerprivate.h"
 #include "gtkprivate.h"
+#include "gtkcenterboxprivate.h"
 
 #include <string.h>
 
@@ -55,8 +56,11 @@
 
 struct _GtkActionBarPrivate
 {
-  GtkWidget *box;
+  GtkWidget *center_box;
+  GtkWidget *start_box;
+  GtkWidget *end_box;
   GtkWidget *revealer;
+
   GtkCssGadget *gadget;
 };
 
@@ -85,7 +89,8 @@ gtk_action_bar_add (GtkContainer *container,
 {
   GtkActionBarPrivate *priv = gtk_action_bar_get_instance_private (GTK_ACTION_BAR (container));
 
-  gtk_container_add (GTK_CONTAINER (priv->box), child);
+  /* Default for pack-type is start */
+  gtk_container_add (GTK_CONTAINER (priv->start_box), child);
 }
 
 static void
@@ -94,7 +99,15 @@ gtk_action_bar_remove (GtkContainer *container,
 {
   GtkActionBarPrivate *priv = gtk_action_bar_get_instance_private (GTK_ACTION_BAR (container));
 
-  gtk_container_remove (GTK_CONTAINER (priv->box), child);
+  if (gtk_widget_get_parent (child) == priv->start_box)
+    gtk_container_remove (GTK_CONTAINER (priv->start_box), child);
+  else if (gtk_widget_get_parent (child) == priv->end_box)
+    gtk_container_remove (GTK_CONTAINER (priv->end_box), child);
+  else if (child == gtk_center_box_get_center_widget (GTK_CENTER_BOX (priv->center_box)))
+    gtk_center_box_set_center_widget (GTK_CENTER_BOX (priv->center_box), NULL);
+  else
+    g_warning ("Can't remove non-child %s %p from GtkActionBar %p",
+               G_OBJECT_TYPE_NAME (child), child, container);
 }
 
 static void
@@ -106,9 +119,20 @@ gtk_action_bar_forall (GtkContainer *container,
   GtkActionBarPrivate *priv = gtk_action_bar_get_instance_private (GTK_ACTION_BAR (container));
 
   if (include_internals)
-    (* callback) (priv->revealer, callback_data);
-  else if (priv->box)
-    gtk_container_forall (GTK_CONTAINER (priv->box), callback, callback_data);
+    {
+      (*callback) (priv->revealer, callback_data);
+    }
+  else
+    {
+      if (priv->start_box != NULL)
+        gtk_container_forall (GTK_CONTAINER (priv->start_box), callback, callback_data);
+
+      if (gtk_center_box_get_center_widget (GTK_CENTER_BOX (priv->center_box)) != NULL)
+        (*callback) (gtk_center_box_get_center_widget (GTK_CENTER_BOX (priv->center_box)), callback_data);
+
+      if (priv->end_box != NULL)
+        gtk_container_forall (GTK_CONTAINER (priv->end_box), callback, callback_data);
+    }
 }
 
 static void
@@ -116,9 +140,10 @@ gtk_action_bar_finalize (GObject *object)
 {
   GtkActionBarPrivate *priv = gtk_action_bar_get_instance_private (GTK_ACTION_BAR (object));
 
-  g_clear_object (&priv->gadget);
   gtk_widget_unparent (priv->revealer);
 
+  g_clear_object (&priv->gadget);
+
   G_OBJECT_CLASS (gtk_action_bar_parent_class)->finalize (object);
 }
 
@@ -137,13 +162,47 @@ gtk_action_bar_get_child_property (GtkContainer *container,
 {
   GtkActionBarPrivate *priv = gtk_action_bar_get_instance_private (GTK_ACTION_BAR (container));
 
-  if (child == priv->revealer)
-    g_param_value_set_default (pspec, value);
-  else
-    gtk_container_child_get_property (GTK_CONTAINER (priv->box),
-                                      child,
-                                      pspec->name,
-                                      value);
+  switch (property_id)
+    {
+    case CHILD_PROP_PACK_TYPE:
+      if (gtk_widget_get_parent (child) == priv->start_box)
+        g_value_set_enum (value, GTK_PACK_START);
+      else if (gtk_widget_get_parent (child) == priv->end_box)
+        g_value_set_enum (value, GTK_PACK_END);
+      else /* Center widget */
+        g_value_set_enum (value, GTK_PACK_START);
+
+      break;
+
+    case CHILD_PROP_POSITION:
+      if (gtk_widget_get_parent (child) == priv->start_box)
+        {
+          int n;
+          gtk_container_child_get (GTK_CONTAINER (priv->start_box),
+                                   child,
+                                   "position", &n,
+                                   NULL);
+          g_value_set_int (value, n);
+        }
+      else if (gtk_widget_get_parent (child) == priv->end_box)
+        {
+          int n;
+          gtk_container_child_get (GTK_CONTAINER (priv->end_box),
+                                   child,
+                                   "position", &n,
+                                   NULL);
+          g_value_set_int (value, n);
+        }
+      else /* Center widget */
+        {
+          g_value_set_int (value, 0);
+        }
+      break;
+
+    default:
+      GTK_CONTAINER_WARN_INVALID_CHILD_PROPERTY_ID (container, property_id, pspec);
+      break;
+    }
 }
 
 static void
@@ -155,11 +214,61 @@ gtk_action_bar_set_child_property (GtkContainer *container,
 {
   GtkActionBarPrivate *priv = gtk_action_bar_get_instance_private (GTK_ACTION_BAR (container));
 
-  if (child != priv->revealer)
-    gtk_container_child_set_property (GTK_CONTAINER (priv->box),
-                                      child,
-                                      pspec->name,
-                                      value);
+  switch (property_id)
+    {
+    case CHILD_PROP_PACK_TYPE:
+      if (gtk_widget_get_parent (child) == priv->start_box)
+        {
+          if (g_value_get_enum (value) == GTK_PACK_END)
+            {
+              g_object_ref (child);
+              gtk_container_remove (GTK_CONTAINER (priv->start_box), child);
+              gtk_box_pack_end (GTK_BOX (priv->end_box), child);
+              g_object_unref (child);
+            }
+        }
+      else if (gtk_widget_get_parent (child) == priv->end_box)
+        {
+          if (g_value_get_enum (value) == GTK_PACK_START)
+            {
+              g_object_ref (child);
+              gtk_container_remove (GTK_CONTAINER (priv->end_box), child);
+              gtk_container_add (GTK_CONTAINER (priv->start_box), child);
+              g_object_unref (child);
+            }
+        }
+      else
+        {
+          /* Ignore the center widget */
+        }
+
+      break;
+
+    case CHILD_PROP_POSITION:
+      if (gtk_widget_get_parent (child) == priv->start_box)
+        {
+          gtk_container_child_set (GTK_CONTAINER (priv->start_box),
+                                   child,
+                                   "position", g_value_get_int (value),
+                                   NULL);
+        }
+      else if (gtk_widget_get_parent (child) == priv->end_box)
+        {
+          gtk_container_child_set (GTK_CONTAINER (priv->end_box),
+                                   child,
+                                   "position", g_value_get_int (value),
+                                   NULL);
+        }
+      else
+        {
+          /* Ignore center widget */
+        }
+      break;
+
+    default:
+      GTK_CONTAINER_WARN_INVALID_CHILD_PROPERTY_ID (container, property_id, pspec);
+      break;
+    }
 }
 
 static gboolean
@@ -171,7 +280,10 @@ gtk_action_bar_render (GtkCssGadget *gadget,
                        int           height,
                        gpointer      data)
 {
-  GTK_WIDGET_CLASS (gtk_action_bar_parent_class)->snapshot (gtk_css_gadget_get_owner (gadget), snapshot);
+  GtkActionBar *self = GTK_ACTION_BAR (gtk_css_gadget_get_owner (gadget));
+  GtkActionBarPrivate *priv = gtk_action_bar_get_instance_private (GTK_ACTION_BAR (self));
+
+  gtk_widget_snapshot_child (GTK_WIDGET (self), priv->revealer, snapshot);
 
   return FALSE;
 }
@@ -196,8 +308,7 @@ gtk_action_bar_allocate (GtkCssGadget        *gadget,
   GtkActionBarPrivate *priv = gtk_action_bar_get_instance_private (GTK_ACTION_BAR (widget));
 
   gtk_widget_size_allocate (priv->revealer, (GtkAllocation *)allocation);
-
-  gtk_container_get_children_clip (GTK_CONTAINER (widget), out_clip);
+  gtk_widget_get_clip (priv->revealer, out_clip);
 }
 
 static void
@@ -291,6 +402,22 @@ gtk_action_bar_get_property (GObject    *object,
 }
 
 static void
+gtk_action_bar_destroy (GtkWidget *widget)
+{
+  GtkActionBar *self = GTK_ACTION_BAR (widget);
+  GtkActionBarPrivate *priv = gtk_action_bar_get_instance_private (self);
+
+  gtk_center_box_set_start_widget (GTK_CENTER_BOX (priv->center_box), NULL);
+  gtk_center_box_set_center_widget (GTK_CENTER_BOX (priv->center_box), NULL);
+  gtk_center_box_set_end_widget (GTK_CENTER_BOX (priv->center_box), NULL);
+
+  priv->start_box = NULL;
+  priv->end_box = NULL;
+
+  GTK_WIDGET_CLASS (gtk_action_bar_parent_class)->destroy (widget);
+}
+
+static void
 gtk_action_bar_class_init (GtkActionBarClass *klass)
 {
   GObjectClass *object_class;
@@ -308,6 +435,7 @@ gtk_action_bar_class_init (GtkActionBarClass *klass)
   widget_class->snapshot = gtk_action_bar_snapshot;
   widget_class->size_allocate = gtk_action_bar_size_allocate;
   widget_class->measure = gtk_action_bar_measure_;
+  widget_class->destroy = gtk_action_bar_destroy;
 
   container_class->add = gtk_action_bar_add;
   container_class->remove = gtk_action_bar_remove;
@@ -354,12 +482,18 @@ gtk_action_bar_init (GtkActionBar *action_bar)
   priv->revealer = gtk_revealer_new ();
   gtk_widget_set_parent (priv->revealer, widget);
 
-  priv->box = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 6);
-  gtk_container_add (GTK_CONTAINER (priv->revealer), priv->box);
-
   gtk_revealer_set_reveal_child (GTK_REVEALER (priv->revealer), TRUE);
   gtk_revealer_set_transition_type (GTK_REVEALER (priv->revealer), GTK_REVEALER_TRANSITION_TYPE_SLIDE_UP);
 
+  priv->start_box = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 0);
+  priv->end_box = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 0);
+
+  priv->center_box = gtk_center_box_new ();
+  gtk_center_box_set_start_widget (GTK_CENTER_BOX (priv->center_box), priv->start_box);
+  gtk_center_box_set_end_widget (GTK_CENTER_BOX (priv->center_box), priv->end_box);
+
+  gtk_container_add (GTK_CONTAINER (priv->revealer), priv->center_box);
+
   widget_node = gtk_widget_get_css_node (GTK_WIDGET (action_bar));
   priv->gadget = gtk_css_custom_gadget_new_for_node (widget_node,
                                                      GTK_WIDGET (action_bar),
@@ -377,10 +511,9 @@ gtk_action_bar_buildable_add_child (GtkBuildable *buildable,
                                     const gchar  *type)
 {
   GtkActionBar *action_bar = GTK_ACTION_BAR (buildable);
-  GtkActionBarPrivate *priv = gtk_action_bar_get_instance_private (action_bar);
 
   if (type && strcmp (type, "center") == 0)
-    gtk_box_set_center_widget (GTK_BOX (priv->box), GTK_WIDGET (child));
+    gtk_action_bar_set_center_widget (action_bar, GTK_WIDGET (child));
   else if (!type)
     gtk_container_add (GTK_CONTAINER (buildable), GTK_WIDGET (child));
   else
@@ -412,7 +545,7 @@ gtk_action_bar_pack_start (GtkActionBar *action_bar,
 {
   GtkActionBarPrivate *priv = gtk_action_bar_get_instance_private (action_bar);
 
-  gtk_box_pack_start (GTK_BOX (priv->box), child);
+  gtk_container_add (GTK_CONTAINER (priv->start_box), child);
 }
 
 /**
@@ -431,7 +564,7 @@ gtk_action_bar_pack_end (GtkActionBar *action_bar,
 {
   GtkActionBarPrivate *priv = gtk_action_bar_get_instance_private (action_bar);
 
-  gtk_box_pack_end (GTK_BOX (priv->box), child);
+  gtk_box_pack_end (GTK_BOX (priv->end_box), child);
 }
 
 /**
@@ -449,7 +582,7 @@ gtk_action_bar_set_center_widget (GtkActionBar *action_bar,
 {
   GtkActionBarPrivate *priv = gtk_action_bar_get_instance_private (action_bar);
 
-  gtk_box_set_center_widget (GTK_BOX (priv->box), center_widget);
+  gtk_center_box_set_center_widget (GTK_CENTER_BOX (priv->center_box), center_widget);
 }
 
 /**
@@ -469,7 +602,7 @@ gtk_action_bar_get_center_widget (GtkActionBar *action_bar)
 
   g_return_val_if_fail (GTK_IS_ACTION_BAR (action_bar), NULL);
 
-  return gtk_box_get_center_widget (GTK_BOX (priv->box));
+  return gtk_center_box_get_center_widget (GTK_CENTER_BOX (priv->center_box));
 }
 
 /**
diff --git a/gtk/gtkcenterbox.c b/gtk/gtkcenterbox.c
new file mode 100644
index 0000000000..316126c2ac
--- /dev/null
+++ b/gtk/gtkcenterbox.c
@@ -0,0 +1,226 @@
+
+#include "gtkcenterboxprivate.h"
+
+G_DEFINE_TYPE (GtkCenterBox, gtk_center_box, GTK_TYPE_WIDGET);
+
+
+static void
+gtk_center_box_measure (GtkWidget      *widget,
+                        GtkOrientation  orientation,
+                        int             for_size,
+                        int            *minimum,
+                        int            *natural,
+                        int            *minimum_baseline,
+                        int            *natural_baseline)
+{
+  GtkCenterBox *self = GTK_CENTER_BOX (widget);
+  int min, nat, min_baseline, nat_baseline;
+
+  gtk_widget_measure (self->start_widget,
+                      orientation,
+                      for_size,
+                      minimum, natural,
+                      minimum_baseline, natural_baseline);
+
+  if (self->center_widget)
+    {
+      gtk_widget_measure (self->center_widget,
+                          orientation,
+                          for_size,
+                          &min, &nat,
+                          &min_baseline, &nat_baseline);
+
+      /* XXX How are baselines even handled? */
+
+      if (orientation == GTK_ORIENTATION_HORIZONTAL)
+        {
+          *minimum = *minimum + min;
+          *natural = *natural + nat;
+        }
+      else /* GTK_ORIENTATION_VERTICAL */
+        {
+          *minimum = MAX (*minimum, min);
+          *natural = MAX (*minimum, nat);
+        }
+    }
+
+  gtk_widget_measure (self->end_widget,
+                      orientation,
+                      for_size,
+                      &min, &nat,
+                      &min_baseline, &nat_baseline);
+
+  if (orientation == GTK_ORIENTATION_HORIZONTAL)
+    {
+      *minimum = *minimum + min;
+      *natural = *natural + nat;
+    }
+  else /* GTK_ORIENTATION_VERTICAL */
+    {
+      *minimum = MAX (*minimum, min);
+      *natural = MAX (*minimum, nat);
+    }
+
+}
+
+static void
+gtk_center_box_size_allocate (GtkWidget     *widget,
+                              GtkAllocation *allocation)
+{
+  GtkCenterBox *self = GTK_CENTER_BOX (widget);
+  GtkAllocation child_allocation;
+  GtkAllocation clip = *allocation;
+  GtkAllocation child_clip;
+  int start_size, end_size;
+  int min, nat;
+
+  GTK_WIDGET_CLASS (gtk_center_box_parent_class)->size_allocate (widget, allocation);
+
+
+  // TODO: Allocate natural sizes if possible?
+
+  /* Start Box */
+  gtk_widget_measure (self->start_widget, GTK_ORIENTATION_HORIZONTAL,
+                      allocation->height,
+                      &min, &nat, NULL, NULL);
+  child_allocation.x = allocation->x;
+  child_allocation.y = allocation->y;
+  child_allocation.width = min;
+  child_allocation.height = allocation->height;
+
+  gtk_widget_size_allocate (self->start_widget, &child_allocation);
+  gtk_widget_get_clip (self->start_widget, &child_clip);
+  gdk_rectangle_union (&clip, &clip, &child_clip);
+  start_size = child_allocation.width;
+
+
+  /* End Box */
+  gtk_widget_measure (self->end_widget, GTK_ORIENTATION_HORIZONTAL,
+                      allocation->height,
+                      &min, &nat, NULL, NULL);
+  child_allocation.x = allocation->x + allocation->width - min;
+  child_allocation.width = min;
+
+  gtk_widget_size_allocate (self->end_widget, &child_allocation);
+  gtk_widget_get_clip (self->end_widget, &child_clip);
+  gdk_rectangle_union (&clip, &clip, &child_clip);
+  end_size = child_allocation.width;
+
+  /* Center Widget */
+  if (self->center_widget)
+    {
+      gtk_widget_measure (self->center_widget, GTK_ORIENTATION_HORIZONTAL,
+                          allocation->height,
+                          &min, &nat, NULL, NULL);
+
+      child_allocation.x = (allocation->width / 2) - (min / 2);
+
+      /* Push in from start/end */
+      if (start_size > child_allocation.x)
+        child_allocation.x = start_size;
+      else if (allocation->width - end_size < child_allocation.x + min)
+        child_allocation.x = allocation->width - min - end_size;
+
+      child_allocation.x += allocation->x;
+      child_allocation.width = min;
+      gtk_widget_size_allocate (self->center_widget, &child_allocation);
+      gtk_widget_get_clip (self->center_widget, &child_clip);
+      gdk_rectangle_union (&clip, &clip, &child_clip);
+    }
+
+  gtk_widget_set_clip (widget, &clip);
+}
+
+static void
+gtk_center_box_snapshot (GtkWidget   *widget,
+                         GtkSnapshot *snapshot)
+{
+  GtkCenterBox *self = GTK_CENTER_BOX (widget);
+
+  gtk_widget_snapshot_child (widget, self->start_widget, snapshot);
+
+  if (self->center_widget)
+    gtk_widget_snapshot_child (widget, self->center_widget, snapshot);
+
+  gtk_widget_snapshot_child (widget, self->end_widget, snapshot);
+}
+
+static void
+gtk_center_box_class_init (GtkCenterBoxClass *klass)
+{
+  GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);
+
+  widget_class->measure = gtk_center_box_measure;
+  widget_class->size_allocate = gtk_center_box_size_allocate;
+  widget_class->snapshot = gtk_center_box_snapshot;
+}
+
+static void
+gtk_center_box_init (GtkCenterBox *self)
+{
+  gtk_widget_set_has_window (GTK_WIDGET (self), FALSE);
+
+  self->start_widget = NULL;
+  self->center_widget = NULL;
+  self->end_widget = NULL;
+}
+
+GtkWidget *
+gtk_center_box_new (void)
+{
+  return GTK_WIDGET (g_object_new (GTK_TYPE_CENTER_BOX, NULL));
+}
+
+void
+gtk_center_box_set_start_widget (GtkCenterBox *self,
+                                 GtkWidget    *child)
+{
+  if (self->start_widget)
+    gtk_widget_unparent (self->start_widget);
+
+  self->start_widget = child;
+  if (child)
+    gtk_widget_set_parent (child, GTK_WIDGET (self));
+}
+
+void
+gtk_center_box_set_center_widget (GtkCenterBox *self,
+                                 GtkWidget    *child)
+{
+  if (self->center_widget)
+    gtk_widget_unparent (self->center_widget);
+
+  self->center_widget = child;
+  if (child)
+    gtk_widget_set_parent (child, GTK_WIDGET (self));
+}
+
+void
+gtk_center_box_set_end_widget (GtkCenterBox *self,
+                               GtkWidget    *child)
+{
+  if (self->end_widget)
+    gtk_widget_unparent (self->end_widget);
+
+  self->end_widget = child;
+  if (child)
+    gtk_widget_set_parent (child, GTK_WIDGET (self));
+}
+
+GtkWidget *
+gtk_center_box_get_start_widget (GtkCenterBox *self)
+{
+  return self->start_widget;
+}
+
+GtkWidget *
+gtk_center_box_get_center_widget (GtkCenterBox *self)
+{
+  return self->center_widget;
+}
+
+GtkWidget *
+gtk_center_box_get_end_widget (GtkCenterBox *self)
+{
+  return self->end_widget;
+}
diff --git a/gtk/gtkcenterboxprivate.h b/gtk/gtkcenterboxprivate.h
new file mode 100644
index 0000000000..445d462b83
--- /dev/null
+++ b/gtk/gtkcenterboxprivate.h
@@ -0,0 +1,43 @@
+
+#ifndef __GTK_CENTER_BOX_H__
+#define __GTK_CENTER_BOX_H__
+
+#include "gtkwidget.h"
+
+#define GTK_TYPE_CENTER_BOX                 (gtk_center_box_get_type ())
+#define GTK_CENTER_BOX(obj)                 (G_TYPE_CHECK_INSTANCE_CAST ((obj), GTK_TYPE_CENTER_BOX, GtkCenterBox))
+#define GTK_CENTER_BOX_CLASS(klass)         (G_TYPE_CHECK_CLASS_CAST ((klass), GTK_TYPE_CENTER_BOX, GtkCenterBoxClass))
+#define GTK_IS_CENTER_BOX(obj)              (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GTK_TYPE_CENTER_BOX))
+#define GTK_IS_CENTER_BOX_CLASS(klass)      (G_TYPE_CHECK_CLASS_TYPE ((klass), GTK_TYPE_CENTER_BOX))
+#define GTK_CENTER_BOX_GET_CLASS(obj)       (G_TYPE_INSTANCE_GET_CLASS ((obj), GTK_TYPE_CENTER_BOX, GtkCenterBoxClass))
+
+typedef struct _GtkCenterBox             GtkCenterBox;
+typedef struct _GtkCenterBoxClass        GtkCenterBoxClass;
+
+struct _GtkCenterBox
+{
+  GtkWidget parent_instance;
+
+  GtkWidget *start_widget;
+  GtkWidget *center_widget;
+  GtkWidget *end_widget;
+};
+
+struct _GtkCenterBoxClass
+{
+  GtkWidgetClass parent_class;
+};
+
+GType      gtk_center_box_get_type (void) G_GNUC_CONST;
+
+GtkWidget *gtk_center_box_new (void);
+void       gtk_center_box_set_start_widget  (GtkCenterBox *self, GtkWidget *child);
+void       gtk_center_box_set_center_widget (GtkCenterBox *self, GtkWidget *child);
+void       gtk_center_box_set_end_widget    (GtkCenterBox *self, GtkWidget *child);
+
+GtkWidget * gtk_center_box_get_start_widget  (GtkCenterBox *self);
+GtkWidget * gtk_center_box_get_center_widget (GtkCenterBox *self);
+GtkWidget * gtk_center_box_get_end_widget    (GtkCenterBox *self);
+
+
+#endif
diff --git a/tests/testactionbar.c b/tests/testactionbar.c
index 00ff9c58ce..bd34bef129 100644
--- a/tests/testactionbar.c
+++ b/tests/testactionbar.c
@@ -46,6 +46,10 @@ create_widgets (GtkActionBar  *bar,
       GtkPackType type;
 
       child = l->data;
+
+      if (child == gtk_action_bar_get_center_widget (bar))
+        continue;
+
       gtk_container_child_get (GTK_CONTAINER (bar), child, "pack-type", &type, NULL);
       if (type == pack_type)
         gtk_container_remove (GTK_CONTAINER (bar), child);