<Swing Dev> 6179357: Generics: JList: ListCellRenderer & prototypeCellValue

[Peter Zhelezniakov]

Florian Brunner wrote:
> So, 2 votes for option 3), which is a reasonable one, I think.
> 
> Pavel? Anyone else?

There certainly are cases when it's tempting to use a String as a 
prototype value for a more complex object. However, with #3 this is 
still doable in a number of ways: JList<Object>, raw JList, or use 
setFixedCellW/H() instead.

I like #3 most.

2009/2/21 Florian Brunner <fbrunnerlist at gmx.ch>
> So I think we have 3 options:
>
> 1) Don't provide a generic cell renderer/ allow only Object as parameter
> for the cell renderer in
> JList.
>
> 2) Add a second generic parameter. Eg. something like:
> class JList <E, P super E>{ ... }
>
> and use P for the prototypeCellValue property as well as for the cell
> renderer.
>
> 3) Require prototypeCellValue to be of type E. In the probably rare
> cases, where this is a problem
> one can still specify a common base class of the items and the
> prototypeCellValue as the generic
> parameter or use a raw type JList.
>
>
>
> I think it would be a pity not to provide a generic cell renderer (1) and
> think 2) is inconvenient
> and confusing, since in my experiences prototypeCellValue is only used
> rarely.
>
> So I'm voting for 3). For which option do you vote? For which reason?

-- 
Peter              |  x33066  |  location: SPB04  |  timezone: GMT+03