<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> </head> <body text="#000000" bgcolor="#FFFFFF"> Indeed, proper a name will be easier to pick up if we merge the two classes Kernel+Widget/Morph. I like the idea about the properties. I don't see the impact though when used in core classes. May be less discoverable. But with proper documentation in the classes, it should not be much a concern. But I guess for a core class as a BorderedMorph, with instances occurring in many part of the system, it is better to have attributes, for efficiency concerns as you mentioned it. If we merge these two classes, we can lower even more the complexity of the Morph hierarchy. That's a cool side benefit. There are very little subclasses of KernelMorph (borderless) : HaloHandle, Halo, Hand, PasteUp. The vast majority are subclass of WidgetMorph (with border). It shows that KernelMorph (aka BoxedMorph, etc) is not useful. Moreover, all these 4 classes but Hand may want to use a border as you can read from their respective drawOn: methods. Concerning the Hand, it could be turned as a direct subclass of MoveableMorph. These discussions are nice opportunity to think about the whole Morph hiererachy. Hilaire <div class="moz-cite-prefix">Le 28/12/2021 à 08:47, Luciano Notarfrancesco a écrit : </div> <blockquote type="cite" cite="mid:CAL5GDyqPYebf8A5ag2ntuOwfHj0jz_K-xzoVA=cmJJrwzEudJw@mail.gmail.com"> <div dir="auto">How about just BorderedMorph?</div> <div dir="auto"> </div> <div dir="auto">Also, I should mention that using “properties” turned out very useful in my project to separate inheritance from some implementation details. I have a “properties” instance variable in the superclass, and I use properties instead of instance variables in most cases. This allows to use inheritance more cleanly, without inheriting instance variables, and particular subclasses can override replace some properties by instance variables if desired (for example for speed). This also allows to make “abstract classes” that are actually concrete and can be instantiated.</div> </blockquote> <pre class="moz-signature" cols="72">-- GNU Dr. Geo <a class="moz-txt-link-freetext" href="http://drgeo.eu">http://drgeo.eu</a> <a class="moz-txt-link-freetext" href="http://blog.drgeo.eu">http://blog.drgeo.eu</a></pre> </body> </html>