DataGrid 2 swipe actions

[Mike Kerner]

Don't be telling me about "well structured commit titles".  There is
nothing clear in that title, unless British is your first language, and
English is your second, and in British we add an "s" on the ends of every
singulars nouns, and peoples speak with a lisps.
In the meantime(s), setting the delayTouches to false(s) on a DG(s) breaks
scrolling(s), thus my PR(s), from however-long-ago it(s) was. :-P
Tag.  You(s)'re it(s)

On Thu, Aug 27, 2020 at 2:17 PM Mark Waddingham via use-livecode <
use-livecode at lists.runrev.com> wrote:

> On 2020-08-27 17:07, Mike Kerner via use-livecode wrote:
> > name's mikey.  y'all can call me...
> > mikey
> >
> > howdy.
> >
> > i think it was just one line of code, too, right?  it was just a matter
> > of
> > setting the delayTouches to true.  i have no idea why it was originally
> > "false".
>
> Well, the advantage of generally trying to make sure all substantive
> changes made to the source have well structured commit titles and decent
> descriptions in the body means its easy to find out by grokking `git
> log` :D
>
> It was changed precisely because of the issues Andrew pointed out with
> DG2, specifically in this commit:
>
> commit ac1beee1dd113e203b6715fe472cf2fa88656bd5
> Author: Michael McCreary <michael.mccreary at runrev.com>
> Date:   Thu Dec 21 12:49:26 2017 +0000
>
>      [[ DataGrid 2 ]] Fix drags to cooperate with the mobile scroller.
>
>      Previously, a data grid's mobile scroller was getting in the way of
>      reorder and swipe actions.
>
>      To fix for reordering, we disable the scroller whenn the user clicks
>      on a reorder control (and re-enable it when the reorder completes).
>
>      Swipes are a little trickier. We track dragging on mouse down, but
>      disabling the scroller at this point will prevent all scrolling.
>      Instead we attempt to determine if the user is trying to drag the
>      row before disabling the scroller.
>
> I'd need to do some more digging to see if the highlight on touch has
> actually been caused by something else since  as I don't recall it being
> an issue, or noticed when DG2 debuted - but I could be wrong. Especially
> more since Android has never had a delayTouches mode.
>
> Either this problem also affects Android, which means turning
> delayTouches on is not really an option (given the negative consequences
> to DG2 behavior); or it doesn't affect Android in which case something
> else has changed (potentially in the iOS scroller control itself).
>
> I suspect we will just need a short timer on mouse down so that it only
> triggers a highlight *if* a scroll message isn't received within the
> interval of the timer.
>
> Warmest Regards,
>
> Mark.
>
> --
> Mark Waddingham ~ mark at livecode.com ~ http://www.livecode.com/
> LiveCode: Everyone can create apps
>
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