[haiku-development] Re: ColumnListView.h
- From: "Ingo Weinhold" <ingo_weinhold@xxxxxx>
- To: haiku-development@xxxxxxxxxxxxx
- Date: Thu, 12 Jan 2012 11:55:31 +0100
Stephan Aßmus wrote:
> Am 11.01.2012 14:43, schrieb Ingo Weinhold:
> > On 2012-01-11 at 11:16:27 [+0100], Axel Dörfler<axeld@xxxxxxxxxxxxxxxx>
> > wrote:
> >> Stephan Aßmus<superstippi@xxxxxx> wrote:
> >>> Actually, in practice one usually wants a mix of weighted widths and
> >>> fixed widths.
> >
> > I don't recall having seen any table/column list API that does a weighted
> > column width layout. They require the API user to specify a width for each
> > column (respectively use some default) and they provide some method to
> > explicitly set a column to the minimum width to fit all cells in it. I
> > believe resizing the view usually doesn't resize any column (or only the
> > last). That doesn't mean that we can't implement a weighted column layout,
> > but I suppose there's a reason why no one else does.
>
> SWT most certainly offers this feature. IIRC, Nautilus behaves so that I
> think GTK offers it as well.
I didn't spot anything related in the GTK API documentation, but I'm not really
familiar with GTK, so I just might have missed it. Anyway, obviously it is also
possible to implement any kind of column resizing strategy in your application.
> Generally wouldn't it be a likely situation
> that one can make good use of any extra space in certain columns while
> others should have a fixed width?
Normally a column has an optimal width -- the minimum width at which all of its
cells are fully visible -- and making it wider is not beneficial. If one or
more columns are smaller than that, things are not really straight-forward.
When enlarging the table (e.g. by resizing the window), those columns could be
enlarged, but when shrinking the table one might rather want to show a
horizontal scroll bar. As I wrote earlier, I haven't seen provisions for a
resizing strategy in any of the popular tool kits I've looked at (Qt, Swing,
GTK), but we certainly could add something in our implementation, if it can be
done in a way that makes sense.
CU, Ingo
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