polylist toys

[Mike Kerner]

while we're on the topic, i was just having a conversation off-list and it
reminded me: we really should do another lcb class.
i looked at lcb a couple of times, messed with it, and then said "meh", and
moved on.

On Fri, Aug 19, 2022 at 8:56 AM panagiotis m via use-livecode <
use-livecode at lists.runrev.com> wrote:

> Hello,
>
> Thank you all for the useful comments.
>
> I *think* the LCB feature in LC 10 Steven mentioned is the "is
> valid" operator, that returns a boolean value indicating whether or not the
> image data is valid.
> Also, note that in the upcoming releases of LC 10 we will add syntax for
> checking if a file/directory exists, so we could check not only image
> validity but also image existence in the first place.
>
> BTW, we have found a workaround for allowing this stack (lazy image
> example) to work in LC 9 as well. The updated bundle will probably appear
> in your account area in the next couple of days.
>
> Kind regards,
> Panos
> --
>
> On Fri, 19 Aug 2022 at 01:13, Alex Tweedly via use-livecode <
> use-livecode at lists.runrev.com> wrote:
>
> >
> > On 18/08/2022 17:34, Steven Crighton via use-livecode wrote:
> > > Hi Mike,
> > >
> > > I just tested the lazy load example and hit populate and clicked around
> > etc and could not trigger an error.
> >
> > As already confirmed, that problem is fixed in 10.
> >
> > However, the lazy load example still contains bugs due to race
> > conditions, some of which I described in some forum post somewhere (Boy
> > do I hate the forums! Surely there's some way to check what posts I have
> > done myself).
> >
> > Thinking about it more, there are other race conditions which are
> > perhaps more obscure, but more serious. I know it's only an example, and
> > maybe can't be expected to be bulletproof, but as an example of how to
> > do Lazy Loading it is (IMHO) really too naive and simplistic. People
> > expect to take those examples and just use them.
> >
> > The obvious race conditions are:
> >
> > 1. if multiple entries reference the same image, then there is a chance
> > the earlier ones never get properly updated (sURLToIndex[pURL] will have
> > been overwritten by the next call to onlineImage before the image value
> > gets set).
> >
> > 2. if the user (or anything else) resets the dataContent of the widget
> > while there are outstanding "load URL"s, then when the downloadComplete
> > is triggered, it will set the image value for some random new item to
> > the image of the earlier one.
> >
> > 3. And if the one which was wrongly set in case 2 above also happens to
> > be a URL that occurs multiple time (i.e. case 1 above), then that
> > wrongly set image will remain "forever".
> >
> > Alex.
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