[libgd] main-toolbar: add a set_labels_menu() method

[Cosimo Cecchi <cosimoc src gnome org>]

commit 34075dfa480e645165d6da60d87bc623ecbdb2d9
Author: Cosimo Cecchi <cosimoc gnome org>
Date:   Mon Aug 27 22:09:58 2012 -0400

    main-toolbar: add a set_labels_menu() method
    
    This method adds a menu to the labels section in the center of the
    toolbar. It can be disabled by setting the model back to NULL.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=677050

 libgd/gd-main-toolbar.c |   65 ++++++++++++++++++++++++++++++++++++++++++++++-
 libgd/gd-main-toolbar.h |    3 ++
 2 files changed, 67 insertions(+), 1 deletions(-)
---
diff --git a/libgd/gd-main-toolbar.c b/libgd/gd-main-toolbar.c
index 9f1ef56..a6b35cf 100644
--- a/libgd/gd-main-toolbar.c
+++ b/libgd/gd-main-toolbar.c
@@ -42,9 +42,13 @@ struct _GdMainToolbarPrivate {
 
   GtkWidget *left_grid;
 
+  GtkWidget *labels_grid;
   GtkWidget *title_label;
   GtkWidget *detail_label;
 
+  GtkWidget *center_menu;
+  GtkWidget *center_menu_child;
+
   GtkWidget *right_grid;
 };
 
@@ -205,7 +209,7 @@ gd_main_toolbar_constructed (GObject *obj)
                              GTK_WIDGET (self->priv->center_group));
 
   /* centered label group */
-  grid = gtk_grid_new ();
+  self->priv->labels_grid = grid = gtk_grid_new ();
   gtk_widget_set_halign (grid, GTK_ALIGN_CENTER);
   gtk_widget_set_valign (grid, GTK_ALIGN_CENTER);
   gtk_grid_set_column_spacing (GTK_GRID (grid), 12);
@@ -351,6 +355,65 @@ add_button_internal (GdMainToolbar *self,
 }
 
 /**
+ * gd_main_toolbar_set_labels_menu:
+ * @self:
+ * @menu: (allow-none):
+ *
+ */
+void
+gd_main_toolbar_set_labels_menu (GdMainToolbar *self,
+                                 GMenuModel    *menu)
+{
+  GtkWidget *button, *grid, *w;
+
+  if (menu == NULL &&
+      ((gtk_widget_get_parent (self->priv->labels_grid) == GTK_WIDGET (self->priv->center_group)) ||
+       self->priv->center_menu_child == NULL))
+    return;
+
+  if (menu != NULL)
+    {
+      g_object_ref (self->priv->labels_grid);
+      gtk_container_remove (GTK_CONTAINER (self->priv->center_group),
+                            self->priv->labels_grid);
+
+      self->priv->center_menu_child = grid = gtk_grid_new ();
+      gtk_grid_set_column_spacing (GTK_GRID (grid), 6);
+      gtk_container_add (GTK_CONTAINER (grid), self->priv->labels_grid);
+      g_object_unref (self->priv->labels_grid);
+
+      w = gtk_arrow_new (GTK_ARROW_DOWN, GTK_SHADOW_NONE);
+      gtk_container_add (GTK_CONTAINER (grid), w);
+
+      self->priv->center_menu = button = gtk_menu_button_new ();
+      gtk_style_context_add_class (gtk_widget_get_style_context (self->priv->center_menu),
+                                   "selection-menu");
+      gtk_widget_destroy (gtk_bin_get_child (GTK_BIN (button)));
+      gtk_widget_set_halign (button, GTK_ALIGN_CENTER);
+      gtk_menu_button_set_menu_model (GTK_MENU_BUTTON (button), menu);
+      gtk_container_add (GTK_CONTAINER (self->priv->center_menu), grid);
+
+      gtk_container_add (GTK_CONTAINER (self->priv->center_group), button);
+    }
+  else
+    {
+      g_object_ref (self->priv->labels_grid);
+      gtk_container_remove (GTK_CONTAINER (self->priv->center_menu_child),
+                            self->priv->labels_grid);
+      gtk_widget_destroy (self->priv->center_menu);
+
+      self->priv->center_menu = NULL;
+      self->priv->center_menu_child = NULL;
+
+      gtk_container_add (GTK_CONTAINER (self->priv->center_group),
+                         self->priv->labels_grid);
+      g_object_unref (self->priv->labels_grid);
+    }
+
+  gtk_widget_show_all (GTK_WIDGET (self->priv->center_group));
+}
+
+/**
  * gd_main_toolbar_add_button:
  * @self:
  * @icon_name: (allow-none):
diff --git a/libgd/gd-main-toolbar.h b/libgd/gd-main-toolbar.h
index 5d4c7e7..6ad8c3a 100644
--- a/libgd/gd-main-toolbar.h
+++ b/libgd/gd-main-toolbar.h
@@ -74,6 +74,9 @@ void        gd_main_toolbar_set_labels (GdMainToolbar *self,
                                         const gchar *primary,
                                         const gchar *detail);
 
+void        gd_main_toolbar_set_labels_menu (GdMainToolbar *self,
+                                             GMenuModel    *menu);
+
 void        gd_main_toolbar_clear (GdMainToolbar *self);
 
 GtkWidget * gd_main_toolbar_add_button (GdMainToolbar *self,