UIX:add_widget: raise Exception instead of just a warning on multiple

parents

kivy/uix/widget.py

@@ -65,7 +65,6 @@ from kivy.properties import NumericProperty, StringProperty, \
 from kivy.graphics import Canvas
 from kivy.base import EventLoop
 from kivy.lang import Builder
-from kivy.logger import Logger
 
 
 class WidgetException(Exception):
@@ -231,10 +230,8 @@ class Widget(EventDispatcher):
         parent = widget.parent
         # check if widget is already a child of another widget
         if parent:
-            Logger.warning(''.join(('Cannot add Widget ', str(widget),\
-                ' It already has a parent ', str(parent),
-                ' Skipping addition')))
-            return
+            raise WidgetException(''.join(('Cannot add ', str(widget),\
+                ' It already has a parent: ', str(parent))))
         widget.parent = self
         if index == 0 or len(self.children) == 0:
             self.children.insert(0, widget)