Re: Displaying scrollable images in a grid-layout

[Yuri Khan <yuri.v.khan@gmail.com>]

On Wed, Apr 15, 2015 at 10:47 PM, Eli Zaretskii <eliz@gnu.org> wrote:

>> However, I believe the threshold where pixel-based scrolling and
>> glyph-row-based scrolling meet should be when at least two full glyph
>> rows fit in a window; this way, after the scroll, the previous row is
>> still visible, providing some continuity.
>
> If you really meant "at least", then this means no threshold at all,
> because obviously we have to, and already do, provide pixel-based
> scrolling when a glyph row does NOT fit in the window.  Right?

When a glyph row does not fit in the window: pixel-based scrolling.

When between one and two glyph rows fit: pixel-based scrolling,
because otherwise the previous row would disappear without a visual
indication where it went.

When more than two full glyph rows fit, that’s where row-based
scrolling stops being disorienting for me.

When fifty glyph rows fit the window, there is no practical difference
between pixel-based and row-based scrolling in terms of visual
feedback.

“No threshold at all” and “pixel-based scrolling when a row does not
fit” would imply pixel-based scrolling always, without regard to rows.
(Most graphical web browsers do exactly that, and I have no problems
with that; but, as you said, that would be a big change to the overall
design.)