OpenEuphoria

Re: lists & widgets

• Posted by David Cuny <dcuny at LANSET.COM> Mar 05, 2000
• 458 views

Jiri wrote:

> I have whipped up a treat for you: widgets, basic
> dos GUI elements.

Nice stuff. A couple of nits to ignore:

1. Traditionally, a radio button represents an exclusive choice - you can
only select one option from the group. Your rbuttons seem to act like
checkboxes.

2. It would be nice if the label were part of the clickable area of
checkboxes and radio buttons, otherwise you're limited to clicking a fairly
small graphic.

3. The vlist has me a bit puzzled. In the demo, choosing clicking the
up/down arrows didn't move the thumb. By the way, I really like the
next-style scrolls, with the arrows stuck together.

4. The behavior of the lists is a bit disconcerting. I expected clicking the
list to set focus on an item, not to choose an item. The lack of visible
feedback makes me unsure as to which item I've actually selected.

5. It would be nice if the sle changed appearance to show that it was in
edit mode - perhaps drawing a thick border around the box. The I-beam is a
bit thin, especially if I have my glasses off.

> Btw, associative lists

I'm quite font of associative lists myself, and your implementation is
typically clever. I had used a similar mechanism in Llama to try avoiding
the namespace mess, but the overhead of using strings as keys turned out to
be significant.

I was thinking that, since Euphoria is optimized to append data elements, it
might be faster to store the keys and values like so:

   { key list, value list }

This might make the appending of new values onto the list slightly cheaper,
although that's not a frequent operation.

Again, very nice - almost enough to make me go back to the portable GUI
project.

-- David Cuny