On Sat, Apr 16, 2022, 12:26 PM Chris Angelico > wrote: > A button IS a widget. > A horizontal box IS a box. > A box IS a container. > A container IS a widget. > > Class hierarchies in graphical systems are just as much based on those > is-a relationships as any of those "horrible metaphors" you may have come > across, and they are absolutely to do with programming. Just because you > had a bad teacher, that doesn't mean the concepts are wrong. >
Well, more like a few dozen bad books. I never studied any of this with a teacher. But when I teach it (to quite a lot of programming professionals), I never once mention that IS-A stuff, other than maybe curses sotto voce. And mostly they come away saying they finally understood it after my presentation. >
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