On 22/03/2015 16:18, Tom Eugelink wrote:
On 22-3-2015 13:53, John Hendrikx wrote:
On 22/03/2015 09:59, Tom Eugelink wrote:
On 22-3-2015 00:12, John Hendrikx wrote:
What I do need however is a way to restore the control to the exact
same state it was in before (the same amount of pixels scrolled,
the same item at the top, the same item at the bottom).
That is an interesting use case. Can you describe it a bit more?
Tom
My app works more like a browser, so when I "go back", I expect the
same screen layout again (even though I have to reconstruct the
screen again). With a ListView, this cannot be done as the #scrollTo
method only shows an item. It doesn't remember however if that item
was somewhere in the middle, top or bottom. It's just convenient if
it was in the same spot, as the user might expect it there. Just
like I expect my browser to go back to the same spot helps me a bit
(eg: I clicked the link at the bottom of the screen somewhere, and
there was something else interesting to the left of it -- that fails
if it is now somewhere else).
Ah, ok. So I am curious; even though the browser main scrollbar might
return to the position you were before (or even when refreshing a site
might do), will it also return divs-with-scrollbar to the same
position? I doubt it.
But HTML is much more low level than JavaFX's controls; if you were to
build a JavaFX screen just using primitive controls, so create your
own list with a pane and a scrollbar, then that scrollbar's API is
available and you can do what you want. As soon as you start
encapsulating things, then it becomes more interesting. Does for
example JSF's list control allow you to specify the scroll position,
or JQuery tables?
Okay, in what way does that change the fact that I'd like to show the
user a screen that was how he left it? I could keep the entire page in
memory I suppose, but I'd even like it to be the same between restarts
(when navigating to the same part of the system again). Anyway, it's
super easy to do, the List just has to expose the scroll position in
pixels, and allow me to put it back there -- exactly how I solved it
with a custom control.
--John
