[nautilus] dbus-manager: Provide undo status

[Carlos Soriano <csoriano src gnome org>]

commit 533dceb8ca2a4be6c751e7747224599dda8f8701
Author: Carlos Soriano <csoriano redhat com>
Date:   Sat Aug 18 20:31:36 2018 +0200

    dbus-manager: Provide undo status
    
    This is interesting for the desktop icons integration, so it can hide
    the undo/redo menu items appropriately.

 data/dbus-interfaces.xml    |  1 +
 src/nautilus-dbus-manager.c | 31 +++++++++++++++++++++++++++++--
 2 files changed, 30 insertions(+), 2 deletions(-)
---
diff --git a/data/dbus-interfaces.xml b/data/dbus-interfaces.xml
index 64176225c..078cf24a2 100644
--- a/data/dbus-interfaces.xml
+++ b/data/dbus-interfaces.xml
@@ -43,5 +43,6 @@
     </method>
     <method name='Redo'>
     </method>
+    <property name="UndoStatus" type="i" access="read"/>
   </interface>
 </node>
diff --git a/src/nautilus-dbus-manager.c b/src/nautilus-dbus-manager.c
index e9b444e72..3257c4bd4 100644
--- a/src/nautilus-dbus-manager.c
+++ b/src/nautilus-dbus-manager.c
@@ -230,6 +230,17 @@ handle_trash_files (NautilusDBusFileOperations  *object,
     return TRUE; /* invocation was handled */
 }
 
+
+static void
+undo_manager_changed (NautilusDBusManager *self)
+{
+    NautilusFileUndoManagerState undo_state;
+
+    undo_state = nautilus_file_undo_manager_get_state ();
+    nautilus_dbus_file_operations_set_undo_status (self->file_operations,
+                                                   undo_state);
+}
+
 static void
 nautilus_dbus_manager_init (NautilusDBusManager *self)
 {
@@ -284,12 +295,28 @@ nautilus_dbus_manager_register (NautilusDBusManager  *self,
                                 GDBusConnection      *connection,
                                 GError              **error)
 {
-    return g_dbus_interface_skeleton_export (G_DBUS_INTERFACE_SKELETON (self->file_operations),
-                                             connection, "/org/gnome/Nautilus" PROFILE, error);
+    gboolean succes;
+
+    succes = g_dbus_interface_skeleton_export (G_DBUS_INTERFACE_SKELETON (self->file_operations),
+                                               connection, "/org/gnome/Nautilus" PROFILE, error);
+    if (succes)
+    {
+        g_signal_connect_object (nautilus_file_undo_manager_get (),
+                                 "undo-changed",
+                                 G_CALLBACK (undo_manager_changed),
+                                 self,
+                                 G_CONNECT_SWAPPED);
+
+        undo_manager_changed (self);
+    }
+
+    return succes;
 }
 
 void
 nautilus_dbus_manager_unregister (NautilusDBusManager *self)
 {
     g_dbus_interface_skeleton_unexport (G_DBUS_INTERFACE_SKELETON (self->file_operations));
+
+    g_signal_handlers_disconnect_by_data (nautilus_file_undo_manager_get (), self);
 }