[nautilus] window-slot: hide trashbar if Trash is empty

[Răzvan-Mihai Chițu <razvanchitu src gnome org>]

commit c03c8674b7675fd076760a810fc01206ee42eba2
Author: Mohammed Sadiq <sadiq sadiqpk org>
Date:   Wed Sep 21 21:12:02 2016 +0530

    window-slot: hide trashbar if Trash is empty
    
    There is no use for trashbar if the Trash is empty.
    So don't show trashbar if Trash is empty.
    
    Also, if user sets the trash empty, withdraw the trashbar if
    already present.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=763147

 src/nautilus-window-slot.c |   40 +++++++++++++++++++++++++++++++++++++++-
 1 files changed, 39 insertions(+), 1 deletions(-)
---
diff --git a/src/nautilus-window-slot.c b/src/nautilus-window-slot.c
index ba278e7..fe6f374 100644
--- a/src/nautilus-window-slot.c
+++ b/src/nautilus-window-slot.c
@@ -29,6 +29,7 @@
 #include "nautilus-mime-actions.h"
 #include "nautilus-special-location-bar.h"
 #include "nautilus-trash-bar.h"
+#include "nautilus-trash-monitor.h"
 #include "nautilus-view.h"
 #include "nautilus-window.h"
 #include "nautilus-x-content-bar.h"
@@ -147,6 +148,10 @@ static void nautilus_window_slot_set_search_visible (NautilusWindowSlot *self,
 static gboolean nautilus_window_slot_get_search_visible (NautilusWindowSlot *self);
 static void nautilus_window_slot_set_location (NautilusWindowSlot *self,
                                                GFile              *location);
+static void trash_state_changed_cb (NautilusTrashMonitor *monitor,
+                                    gboolean              is_empty,
+                                    gpointer              user_data);
+
 gboolean
 nautilus_window_slot_handles_location (NautilusWindowSlot *self,
                                        GFile              *location)
@@ -886,6 +891,10 @@ nautilus_window_slot_init (NautilusWindowSlot *self)
     priv = nautilus_window_slot_get_instance_private (self);
     app = g_application_get_default ();
 
+    g_signal_connect (nautilus_trash_monitor_get (),
+                      "trash-state-changed",
+                      G_CALLBACK (trash_state_changed_cb), self);
+
     priv->slot_action_group = G_ACTION_GROUP (g_simple_action_group_new ());
     g_action_map_add_action_entries (G_ACTION_MAP (priv->slot_action_group),
                                      slot_entries,
@@ -2309,6 +2318,30 @@ out:
 }
 
 static void
+trash_state_changed_cb (NautilusTrashMonitor *monitor,
+                        gboolean              is_empty,
+                        gpointer              user_data)
+{
+    GFile *location;
+    NautilusDirectory *directory;
+
+    location = nautilus_window_slot_get_current_location (user_data);
+
+    if (location == NULL)
+    {
+        return;
+    }
+
+    directory = nautilus_directory_get (location);
+
+    if (nautilus_directory_is_in_trash (directory) &&
+        nautilus_trash_monitor_is_empty ())
+    {
+        nautilus_window_slot_remove_extra_location_widgets (user_data);
+    }
+}
+
+static void
 nautilus_window_slot_show_trash_bar (NautilusWindowSlot *self)
 {
     GtkWidget *bar;
@@ -2481,7 +2514,10 @@ nautilus_window_slot_setup_extra_location_widgets (NautilusWindowSlot *self)
 
     if (nautilus_directory_is_in_trash (directory))
     {
-        nautilus_window_slot_show_trash_bar (self);
+        if (!nautilus_trash_monitor_is_empty ())
+        {
+            nautilus_window_slot_show_trash_bar (self);
+        }
     }
     else
     {
@@ -2649,6 +2685,8 @@ nautilus_window_slot_dispose (GObject *object)
 
     nautilus_window_slot_remove_extra_location_widgets (self);
 
+    g_signal_handlers_disconnect_by_data (nautilus_trash_monitor_get (), self);
+
     if (priv->content_view)
     {
         widget = GTK_WIDGET (priv->content_view);