[baobab] Fix context menu items sensitivity

[Stefano Facchini <sfacchini src gnome org>]

commit 8e696ac7fe54b109d2af630e090a882c18122907
Author: Ondrej Holy <oholy redhat com>
Date:   Wed Jun 24 13:58:57 2015 +0200

    Fix context menu items sensitivity
    
    Context menu items "Go to parent folder", "Zoom in", "Zoom out" stay
    always active, even if they can not bring effect (e.g. already in
    the top directory, maximal zoom). This patch set sensitivity of the
    mentioned menu items accordingly.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=751436

 src/baobab-chart.vala |   15 +++++++++++++++
 1 files changed, 15 insertions(+), 0 deletions(-)
---
diff --git a/src/baobab-chart.vala b/src/baobab-chart.vala
index d2d8d46..703a734 100644
--- a/src/baobab-chart.vala
+++ b/src/baobab-chart.vala
@@ -547,6 +547,13 @@ namespace Baobab {
             (get_toplevel () as Window).trash_file (highlighted_item.iter);
         }
 
+        protected bool can_move_up_root () {
+            Gtk.TreeIter iter, parent_iter;
+
+            model.get_iter (out iter, root);
+            return model.iter_parent (out parent_iter, iter);
+        }
+
         public void move_up_root () {
             Gtk.TreeIter iter, parent_iter;
 
@@ -584,6 +591,14 @@ namespace Baobab {
             action = action_group.lookup_action ("trash-file") as SimpleAction;
             action.set_enabled (enable);
 
+            action = action_group.lookup_action ("move-up") as SimpleAction;
+            action.set_enabled (can_move_up_root ());
+
+            action = action_group.lookup_action ("zoom-in") as SimpleAction;
+            action.set_enabled (can_zoom_in ());
+            action = action_group.lookup_action ("zoom-out") as SimpleAction;
+            action.set_enabled (can_zoom_out ());
+
             if (event != null) {
                 context_menu.popup (null, null, null, event.button, event.time);
             } else {