widget desc: Add dark_background attr

Author: irgolic

orangecanvas/registry/description.py

@@ -361,7 +361,7 @@ def __init__(self, name, id, category=None, version=None,
                  maintainer=None, maintainer_email=None,
                  help=None, help_ref=None, url=None, keywords=None,
                  priority=sys.maxsize,
-                 icon=None, background=None,
+                 icon=None, background=None, dark_background=None,
                  replaces=None, short_name=None,
                  ):
         if inputs is None:
@@ -415,6 +415,7 @@ def __init__(self, name, id, category=None, version=None,
         self.priority = priority
         self.icon = icon
         self.background = background
+        self.dark_background = dark_background
         self.replaces = list(replaces)
 
     def __str__(self):

orangecanvas/registry/utils.py

@@ -73,6 +73,7 @@ def widget_from_module_globals(module):
     priority = getattr(module, "PRIORITY", sys.maxsize)
     keywords = getattr(module, "KEYWORDS", None)
     background = getattr(module, "BACKGROUND", None)
+    dark_background = getattr(module, "DARK_BACKGROUND", None)
     replaces = getattr(module, "REPLACES", None)
 
     inputs = list(map(input_channel_from_args, inputs))
@@ -100,6 +101,7 @@ def widget_from_module_globals(module):
         priority=priority,
         icon=icon,
         background=background,
+        dark_background=dark_background,
         replaces=replaces)