[haiku-development] Re: documentation/help with layout system needed

On 2008-08-27 at 00:03:05 [+0200], julun <host.haiku@xxxxxx> wrote:
> Ingo Weinhold schrieb:
> > On 2008-08-26 at 12:16:36 [+0200], julun <host.haiku@xxxxxx> wrote:
> >> Ingo Weinhold schrieb:
> >>> On 2008-08-26 at 10:53:33 [+0200], julun <host.haiku@xxxxxx> wrote:
> >>>> Stephan Assmus schrieb:
> >>>> Do
> >>>> they also have to respect the passed explicit min/max size, they don't
> >>>> atm.
> >>> If you mean the constraints set on the view, that's kind of tricky, 
> >>> since
> >>> the used layout might not even support constraints spanning more than 
> >>> one
> >>> column. By default the label item has fixed width, in which case the
> >>> view's
> >>> constraints could directly be translated to constraints for the other
> >>> item,
> >>> but since it is possible to set explicit constraints on the items, 
> >>> that's
> >>> not always feasible.
> >> I had a certain width for my dialog with some elements like this:
> >>
> >> |- BBox -----------------------------------------------------------|
> >> |                                  
> >> |  PopUpMenu                                            BButton    |
> >> |                                  
> >> --------------------------------------------------------------------
> >>
> >> I was interested to span the popup menu bar over the whole length
> >> close to the button by setting PopUpMenu CreateMenuBarLayoutItem
> >> SetExplicitMinSize(BSize(button height, B_SIZE_UNLIMITED )).
> > 
> > Assuming that the PopUpMenu is a BMenuField and your BBox has a horizontal
> > group layout, you added the menu field items and the button in that order,
> > and also assuming the BSize() parameters were actually the other way 
> > around,
> > that still doesn't achieve what you want.
> 
> Yes, i did it that way. I was just typing what i remembered so far,
> got mixed up  :(
> 
> > You should set the item's maximum
> > size to BSize(B_SIZE_UNLIMITED, B_SIZE_UNSET).
> 
> If i looked correctly the MenuBarLayoutItem ctor set's this value,
> still no luck.

Mmh, not sure if it shouldn't do that. I guess instead the BaseMaxSize() 
should report the correct values (i.e. unlimited width and min height). In 
either case the behavior should be the same, though.

> I will go back to this and see what might be wrong.

There's also a bit of optional debug output in TwoDimensionalLayout.cpp that 
might help tracking the problem down.

CU, Ingo

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