[gtk+] menusectionbox: add support for "text-direction" attribute

[Matthias Clasen <matthiasc src gnome org>]

commit 133da654338544c9d8bf657eb3da3f5902e8889b
Author: Christian Hergert <chergert redhat com>
Date:   Wed Oct 12 13:56:57 2016 -0700

    menusectionbox: add support for "text-direction" attribute
    
    This allows the use of a "text-direction" hint set to one of "none", "rtl",
    or "ltr" to enforce the text direction of a "horizontal-buttons"
    display-hint.
    
    This is useful when a menu has buttons that map to physical space in the
    UI and therefore must match the application widgetry.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=772775

 gtk/gtkapplicationwindow.c |    3 +++
 gtk/gtkmenusectionbox.c    |   14 ++++++++++++++
 gtk/gtkmenutrackeritem.c   |   10 ++++++++++
 gtk/gtkmenutrackeritem.h   |    2 ++
 4 files changed, 29 insertions(+), 0 deletions(-)
---
diff --git a/gtk/gtkapplicationwindow.c b/gtk/gtkapplicationwindow.c
index 62d133a..2128f98 100644
--- a/gtk/gtkapplicationwindow.c
+++ b/gtk/gtkapplicationwindow.c
@@ -135,6 +135,9 @@
  * - "label": a user-visible string to use as section heading
  * - "display-hint": a string used to determine special formatting for the section.
  *     Possible values include "horizontal-buttons".
+ * - "text-direction": a string used to determine the #GtkTextDirection to use
+ *     when "display-hint" is set to "horizontal-buttons". Possible values
+ *     include "rtl", "ltr", and "none".
  *
  * The following attributes are used when constructing submenus:
  * - "label": a user-visible string to display
diff --git a/gtk/gtkmenusectionbox.c b/gtk/gtkmenusectionbox.c
index 61c761b..b790825 100644
--- a/gtk/gtkmenusectionbox.c
+++ b/gtk/gtkmenusectionbox.c
@@ -483,6 +483,7 @@ gtk_menu_section_box_new_section (GtkMenuTrackerItem *item,
   GtkMenuSectionBox *box;
   const gchar *label;
   const gchar *hint;
+  const gchar *text_direction;
 
   box = g_object_new (GTK_TYPE_MENU_SECTION_BOX, NULL);
   box->toplevel = parent->toplevel;
@@ -490,12 +491,25 @@ gtk_menu_section_box_new_section (GtkMenuTrackerItem *item,
 
   label = gtk_menu_tracker_item_get_label (item);
   hint = gtk_menu_tracker_item_get_display_hint (item);
+  text_direction = gtk_menu_tracker_item_get_text_direction (item);
 
   if (hint && g_str_equal (hint, "horizontal-buttons"))
     {
       gtk_orientable_set_orientation (GTK_ORIENTABLE (box->item_box), GTK_ORIENTATION_HORIZONTAL);
       gtk_style_context_add_class (gtk_widget_get_style_context (GTK_WIDGET (box->item_box)), 
GTK_STYLE_CLASS_LINKED);
       box->iconic = TRUE;
+
+      if (text_direction)
+        {
+          GtkTextDirection dir = GTK_TEXT_DIR_NONE;
+
+          if (g_str_equal (text_direction, "rtl"))
+            dir = GTK_TEXT_DIR_RTL;
+          else if (g_str_equal (text_direction, "ltr"))
+            dir = GTK_TEXT_DIR_LTR;
+
+          gtk_widget_set_direction (GTK_WIDGET (box->item_box), dir);
+        }
     }
 
   if (label != NULL)
diff --git a/gtk/gtkmenutrackeritem.c b/gtk/gtkmenutrackeritem.c
index 7d89521..ef1b60c 100644
--- a/gtk/gtkmenutrackeritem.c
+++ b/gtk/gtkmenutrackeritem.c
@@ -726,6 +726,16 @@ gtk_menu_tracker_item_get_display_hint (GtkMenuTrackerItem *self)
   return display_hint;
 }
 
+const gchar *
+gtk_menu_tracker_item_get_text_direction (GtkMenuTrackerItem *self)
+{
+  const gchar *text_direction = NULL;
+
+  g_menu_item_get_attribute (self->item, "text-direction", "&s", &text_direction);
+
+  return text_direction;
+}
+
 GMenuModel *
 _gtk_menu_tracker_item_get_link (GtkMenuTrackerItem *self,
                                  const gchar        *link_name)
diff --git a/gtk/gtkmenutrackeritem.h b/gtk/gtkmenutrackeritem.h
index 6b4fcb5..2f4f04a 100644
--- a/gtk/gtkmenutrackeritem.h
+++ b/gtk/gtkmenutrackeritem.h
@@ -53,6 +53,8 @@ const gchar *           gtk_menu_tracker_item_get_special               (GtkMenu
 
 const gchar *           gtk_menu_tracker_item_get_display_hint          (GtkMenuTrackerItem *self);
 
+const gchar *           gtk_menu_tracker_item_get_text_direction        (GtkMenuTrackerItem *self);
+
 GtkActionObservable *  _gtk_menu_tracker_item_get_observable            (GtkMenuTrackerItem *self);
 
 gboolean                gtk_menu_tracker_item_get_is_separator          (GtkMenuTrackerItem *self);