From 9d6a29af5ec0724967244cc8a64d9b512dc01651 Mon Sep 17 00:00:00 2001
From: Ignacio Rodriguez <ignacio@sugarlabs.org>
Date: Thu, 12 Dec 2013 19:27:17 +0000
Subject: Show watch cursor when invert colors function is called

---
diff --git a/Area.py b/Area.py
index 06f744f..68c0e1c 100644
--- a/Area.py
+++ b/Area.py
@@ -1198,7 +1198,7 @@ class Area(Gtk.DrawingArea):
 
         self._do_process(widget, proc_grayscale)
 
-    def invert_colors(self, widget):
+    def invert_colors(self, widget, old_cursor, source_id, window):
         """Apply invert effect.
 
             @param  self -- the Area object (GtkDrawingArea)
@@ -1206,7 +1206,7 @@ class Area(Gtk.DrawingArea):
 
         """
 
-        def internal_invert(self, old_cursor):
+        def internal_invert(self, old_cursor, source_id, window):
             # load a array with the surface data
             for array_type in ['H', 'I', 'L']:
                 pixels = array.array(array_type)
@@ -1237,11 +1237,11 @@ class Area(Gtk.DrawingArea):
 
             self.queue_draw()
             self.enable_undo()
-            self.get_window().set_cursor(old_cursor)
+            GObject.source_remove(source_id)
+            window.set_cursor(old_cursor)
 
-        old_cursor = self.get_window().get_cursor()
-        self.get_window().set_cursor(Gdk.Cursor.new(Gdk.CursorType.WATCH))
-        GObject.idle_add(internal_invert, self, old_cursor)
+        GObject.idle_add(internal_invert, self, old_cursor,
+            source_id, window)
 
     def mirror(self, widget, horizontal=True):
         """Apply mirror horizontal/vertical effect.
diff --git a/toolbox.py b/toolbox.py
index b4e624e..0646892 100644
--- a/toolbox.py
+++ b/toolbox.py
@@ -814,4 +814,12 @@ class ImageToolbar(Gtk.Toolbar):
         self.properties['name'] = self._EFFECT_RAINBOW_NAME
 
     def invert_colors(self, widget):
-        self._activity.area.invert_colors(widget)
+        window = self.get_window()
+        old_cursor = window.get_cursor()
+        source_id = GObject.idle_add(self.set_watch_cursor, window)
+        self._activity.area.invert_colors(widget, old_cursor,
+            source_id, window)
+
+    def set_watch_cursor(self, window):
+        window.set_cursor(Gdk.Cursor.new(Gdk.CursorType.WATCH))
+        return True
--
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