[mythtv-theming] scrollstyle=free works only with arrange=fixed?

[Joey Morris]

John P Poet <jppoet at gmail.com> wrote on Sun, Nov 11, 2012 at 08:57:25PM -0700:
> On Sun, Nov 11, 2012 at 7:39 PM, Joey Morris <rjmorris at nc.rr.com> wrote:
> 
> > John P Poet <jppoet at gmail.com> wrote on Sun, Nov 11, 2012 at 05:26:10PM
> > -0700:
> > > On Sun, Nov 11, 2012 at 10:41 AM, Joey Morris <rjmorris at nc.rr.com>
> > wrote:
> > >
> > > > I'm using 0.25.3-fixes. I'm trying to create a buttonlist with
> > > > arrange=stack and scrollstyle=free. However, when I scroll through the
> > > > list, it behaves as if scrollstyle=center. Trying a few combinations,
> > > > it looks like setting arrange=fixed is the only way to get free
> > > > scrolling. Setting arrange to stack, spread, or fill results in center
> > > > scrolling. Do others see this behavior? Is this a bug or is it
> > > > intended?
> > > >
> > > > Using arrange=fixed won't work for me, because I want my buttons to be
> > > > different sizes depending on whether they're selected or not. I looked
> > > > at some other themes where the buttons are like that, and they all
> > > > have center scrolling.
> > > >
> > >
> > > The "center" behavior you are seeing is a side effect of the way the
> > > buttons are laid out with arrange != fixed.  I don't know what you are
> > > trying to achieve, but playing with <align> might help you out.
> >
> > Thanks. I don't think <align> applies here, but maybe I'm missing how
> > it could be used.
> >
> > To see what I'm trying to achieve, take the Watch Recordings screen in
> > your Steppes theme for example. When an item in the recordings list is
> > selected, its size increases so that more information may be
> > displayed. That part's working in my theme after I set arrange=stack.
> > With arrange=fixed, making the selected button larger is a problem
> > because it covers the next button in the list.
> >
> > I prefer the free scrolling style to the center style, so the second
> > part of what I'm trying to achieve is to configure free scrolling in
> > the recordings list. Back to the Steppes them, when scrolling through
> > the recordings list, you'll notice it exhibits the center scrolling
> > style. Adding <scrollstyle>free</scrollstyle> to the recordings
> > buttonlist doesn't change anything. It seems to ignore the free
> > setting.
> >
> > You can also see this in the alphabet list in Steppes's Program Finder
> > screen. You've set arrange=stack and scrollstyle=free for that
> > buttonlist, but when scrolling through the list, it uses the center
> > scrolling style.
> >
> >
> That was a design choice.  scrollstyle = free does work with arrange !=
> fixed, but it does not work the same way it does when arrange = fixed.
> With arrange != fixed, if the entire item list will fit, or if you are near
> the end of the list, then it is "free", otherwise it is "centered".
> 
> At this point, changing the behavior of scrollstyle = free with arrange !=
> fixed would break the intended behavior.  However, if you would like to
> code up a new scrollstyle ("float"?), I would be happy to review it.

Thanks for the explanation. I'll add the new scrollstyle method to my
list of tasks to tackle once I start building from source.

I updated the wiki to clarify free's behavior when arrange != fixed.

http://www.mythtv.org/wiki/MythUI_Theme_Development#The_buttonlist_widget