Two questions, as I'm trying to extend the Racket `gui` widgets just a
little, for small touchscreens, while remaining cross-platform and
desktop friendly:
1. For all the platforms supported by Racket `gui` widgets, is
`change-children` a good way to frequently switch among subtrees of
widgets? (Like currently for `tab-panel%`, but also for a
smartphone-like app's dynamic stack of UI pages.)
2. If `change-children` is a good way, is any noteworthy state of a
widget tree *not* preserved between hiding and unhiding this way,
assuming that the parent container widget geometry hasn't changed in the
meantime? (Offhand, I'm especially interested in whether the current
scroll position of panels is retained between hiding and unhiding, by
default, such as when user is going through a big hierarchy of
Android-style scrolling lists of settings, and not wanting to lose their
scrolling place when they back up to the big top level. You could also
see such page stacks be used for things like what might be modal popup
windows in a traditional desktop GUI.)
(Reason for asking: I can't tell from the documentation, and this seems
like a time to ask. Although I can test&tweak behavior with GTK2 and
GTK3 on GNU/Linux handhelds and desktops, I'd prefer to use an an
approach that should also work well on all the other Racket `gui`
platforms (current and future), without expending time&money right now
to test&tweak on all the current ones. One idea for this handhelds
unfunded side project (which might not go anywhere) is that
handheld-oriented apps people make for Racket-on-Linux might also turn
out to work well for whatever desktop/laptop platform Racketeers use.
For example, a straightforward set of traditional handheld
email/IRC/monitoring/etc. apps, but in tiled windows on your desktop
side monitor or laptop workspace, might work pretty well. Well enough
to inspire more such cross-handheld/desktop apps to be written, whatever
platform the initial developer targets initially.)
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