<!DOCTYPE html> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> </head> <body text="#000000" bgcolor="#FFFFFF"> Hi Mark, Often, we subclass more than necessary. Your TODO exercise app could be written without the need to subclass. I will use a SystemWindow instance where there is already a LayoutMorph instance installed, ready to receive your widget installments. I will make the TodoApp a subclass of Object. It will be your Presenter object knowing about the Model and the View (your SystemWindows instance) and it will handle the events of the widget you have installed in the SystemWindow instance. You will subclass LayoutMoprh if you need to add some special behavior and make a new kind of widget of it. Otherwise it is wise to not do it, it adds unnecessary complexity. Hilaire <div class="moz-cite-prefix">Le 08/08/2024 à 13:06, Mark Volkmann via Cuis-dev a écrit : </div> <blockquote type="cite" cite="mid:CAFfRWnUwBKXvwZT4D5LAGTJrWUP7p8qyYM=dHOntSBUgQ8ox7Q@mail.gmail.com"> <div>My class is a subclass of LayoutMorph, so I'm not sending a #new* message to LayoutMorph directly. I'm sending #new to my own class. </div> </blockquote> <pre class="moz-signature" cols="72">-- GNU Dr. Geo <a class="moz-txt-link-freetext" href="http://gnu.org/s/dr-geo/">http://gnu.org/s/dr-geo/</a> <a class="moz-txt-link-freetext" href="http://gnu-drgeo.blogspot.com/">http://gnu-drgeo.blogspot.com/</a></pre> </body> </html>