Make SubScene Resizable (RT-31377)

[Kevin Rushforth]

I like #2 for the ease of use.

-- Kevin


Pavel Safrata wrote:
> Hello,
> we want to make SubScene resizable (reporting min/pref/max sizes 
> according to its root) for it to behave nicely when placed in layout ( 
> https://javafx-jira.kenai.com/browse/RT-31377 ). For the main driver 
> of SubScene's existence - 2D overlays over 3D content - this makes 
> perfect sense. However, there are use-cases where the fixed size is 
> needed. Mainly, every SubScene with 3D content probably wants the 
> fixed size as the content bounds are not really meaningful after the 
> perspective projection. So, we need to support both resizable and 
> non-resizable SubScene.
>
> There are two basic options:
>
> 1. Follow the pattern used in layouts. As SubScene is not a layout 
> class (doesn't inherit from Region), this would mean adding the six 
> methods ( set{Min|Pref|Max}{Width|Height} ) and duplicating the 
> Region's USE_COMPUTED_SIZE constant.
>
> + consistent with layouts
> - duplicated API
> - user needs six calls to make sure the SubScene has fixed size
>
> 2. Add an isResizable constructor argument, then just make the 
> SubScene report root's min/pref/max sizes in the resizable case.
>
> + easy to use the SubScene in the fixed-size manner (and resizable, too)
> + small API change
> - probably an unfamiliar pattern we don't have elsewhere (but, 
> SubScene is a pretty unique node)
>
> What do you think?
>
> Thanks,
> Pavel
>