[gtk+] a11y: Set up popup-for relation between entry and completion

[Matthias Clasen <matthiasc src gnome org>]

commit 1e85e0f017d7dcf283255033d526f840d4c325eb
Author: Matthias Clasen <mclasen redhat com>
Date:   Sun Feb 3 16:32:21 2013 -0500

    a11y: Set up popup-for relation between entry and completion
    
    This may address
    https://bugzilla.gnome.org/show_bug.cgi?id=658148

 gtk/gtkentrycompletion.c |   36 ++++++++++++++++++++++++++++++++++++
 1 files changed, 36 insertions(+), 0 deletions(-)
---
diff --git a/gtk/gtkentrycompletion.c b/gtk/gtkentrycompletion.c
index 2f4bd28..e4968df 100644
--- a/gtk/gtkentrycompletion.c
+++ b/gtk/gtkentrycompletion.c
@@ -2611,6 +2611,35 @@ connect_completion_signals (GtkEntryCompletion *completion)
     }
 }
 
+static void
+set_accessible_relation (GtkWidget *window,
+                         GtkWidget *entry)
+{
+  AtkObject *window_accessible;
+  AtkObject *entry_accessible;
+
+  window_accessible = gtk_widget_get_accessible (window);
+  entry_accessible = gtk_widget_get_accessible (entry);
+
+  atk_object_add_relationship (window_accessible,
+                               ATK_RELATION_POPUP_FOR,
+                               entry_accessible);
+}
+
+static void
+unset_accessible_relation (GtkWidget *window,
+                           GtkWidget *entry)
+{
+  AtkObject *window_accessible;
+  AtkObject *entry_accessible;
+
+  window_accessible = gtk_widget_get_accessible (window);
+  entry_accessible = gtk_widget_get_accessible (entry);
+
+  atk_object_remove_relationship (window_accessible,
+                                  ATK_RELATION_POPUP_FOR,
+                                  entry_accessible);
+}
 
 static void
 disconnect_completion_signals (GtkEntryCompletion *completion)
@@ -2660,6 +2689,9 @@ _gtk_entry_completion_disconnect (GtkEntryCompletion *completion)
 
   disconnect_completion_signals (completion);
 
+  unset_accessible_relation (completion->priv->popup_window,
+                             completion->priv->entry);
+
   completion->priv->entry = NULL;
 }
 
@@ -2668,5 +2700,9 @@ _gtk_entry_completion_connect (GtkEntryCompletion *completion,
                                GtkEntry           *entry)
 {
   completion->priv->entry = GTK_WIDGET (entry);
+
+  set_accessible_relation (completion->priv->popup_window,
+                           completion->priv->entry);
+
   connect_completion_signals (completion);
 }