Bases: MetaSuper, MetaSignals
Automatic caching of render and rows methods.
Class variable no_cache is a list of names of methods to not cache automatically. Valid method names for no_cache are 'render' and 'rows'.
Class variable ignore_focus if defined and set to True indicates that the canvas this widget renders is not affected by the focus parameter, so it may be ignored when caching.
adding .__super
register the list of signals in the class varable signals, including signals in superclasses.