A few changes to the QML UI

[Linus Torvalds]

On Sat, Apr 14, 2018, 21:08 Linus Torvalds <torvalds at linux-foundation.org>
wrote:

>
> It's very clear, and happens both with all trips collapsed and with one or
> more trips exposed. I can scroll down once, but when I try to scroll
> further, at first nothing happens at all, then it resets to an earlier
> state (maybe back to the top) and then it scrolls down some more.
>

Ok, so there is a pattern to the oddity.

I tried to move my finger very slowly and keep track of where my finger was
and which entry I was touching.

I may not be great at explaining the behavior I see, but imagine that you
have all trips collapsed, and the first scroll event is you touching a trip
right in the middle of the screen, and slowly moving your finger up.
Everything works fine.

It at least *almost* fine. I think there is an off-by-one error, where when
I put my finger down tp before I move it, the dive list jumps by one entry.
So there is a small jerk event happening even there, but it's almost
unnoticeable. The scrolling itself is fairly smooth once I start moving my
finger.

Then, release the finger, and start the next scroll event lower down (say,
three quarters of to the bottom), and moved your finger up to scroll.

During that second scroll event, *nothing* happens in the screen for me at
first, until my finger hits the point where I started the *first* scroll
(so I moved my finger from 3/4 down the screen up to the halfway point
without anything moving at all). But when I hit that point where I started
my previous scroll, the dive log screen resets to where it was the *last*
scroll event, and then starts scrolling with my finger again.

So I never and up making any actual progress, and it feels really jerky
because part of the time the screen doesn't react to the finger at all, and
then when you pass a certain point it jumps and starts reacting again, just
at the wrong place.

So there seems to be some "screen offset" thing going on, with some
history.

Except *occasionally* the second scroll event works fine. So I can make
some progress every once in a while. I didn't figure out the pattern for
that, though.

       Linus

>
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