Overriding Built In Methods

General
1

I see that I can override, for example, Window.Show by simply adding the method .Show to my Window class. Is it OK to do this?

And, is there a way within the method to call the original function so that my Show method looks like

Window.Show
… Do stuff…
self.show // for real. No recursion please.

Window.Show is just an example. I’m curious in general about this.

2

(Writing this before I’m properly awake, so this may contain big errors)

There are generally two ways to access methods & properties of a superclass:

  • the Super keyword, e.g.
Super.Show
  • casting the object to an instance of the superclass
Window(Self).Show

Note that the rules regarding which to use in which situation is a bit complicated, I believe the right answer depends on whether the Method or Property is “virtual” or not. http://en.wikipedia.org/wiki/Virtual_function

Also, a second complication is that Windows are actually internally implemented as a Module, not a Class.

3

Actually, the shadowing issue only applies to properties. Overriding a method is perfectly fine.

4

Thanks Joe and Michael

5

If Super.ABC works, then you’re dealing with a method and you’re fine. If it doesn’t work (doesn’t compile), then you’re actually shadowing a property and should rethink your approach.

6

Well, the link to it sure works but I wouldn’t go there on a work machine. :stuck_out_tongue:

7

Wow. And here I thought that .XXX hadn’t yet been approved as a top-level domain.

On a related note, EsoTalk’s automatic link feature needs serious work.

8

Why does it need to be automatic? We have the ability to make links when appropriate.

9

I agree. But if it’s going to be automatic then it needs to be harder to trigger.

10

Oh Lord. Can that auto link feature please be disabled?

11

Lol - I just saw it. Best link to Xojo documentation so far :smiley:

12

I‘m grinning from ear to ear :smiley:

Thanks Tim! Made my day :wink:

13

Links edited :slight_smile:

14

FWIW the auto-link system is where I got the idea to snag Xojo.io :slight_smile:

15

BOOO! Spoilsport! Now it’s not funny anymore …

I really hate this nanny-state attitude … it‘s ok for Americans to have Horror and War, Weapons are glorified, but God forbid there is the suggestion of a nipple involved …

16

Personally, I agree. But, the Xojo forum is not the place for that.

17

Not a place for fun? An edit could simply have been to replace the dot with a comma, then the fun would have been preserved without the danger of accidently following the link.

P.S. or maybe put the dot in italics? Must see if that works: xojo.com

P.P.S. Yes, that works to disable a link.

18

Not a place for the airing political grievances, or pornography for that matter.

19

Who’s airing pornography??? [where is that rolling eyes smiley when you need it]

Maybe you should read properly before accusing anyone? Just a thought …

20

I assumed you were talking about the link that was edited from “super.xxx”, which is was a porn site. Please excuse my confusion; could you clarify what you were referring to?